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• Any products mentioned in this catalog are subject to any modification in their appearance and others for improvements without prior notification.• The details listed here are not a guarantee of the individual products at the time of ordering. When using the products, you will be asked to check their specifications.
MITSUMI 2ch Synchronous Step-down DC/DC Converter + 1ch LDO + 2ch P-GOOD MM3558 Series
2ch Synchronous Step-down DC/DC Converter + 1ch LDO + 2ch P-GOODMonolithic IC MM3558 Series
Outline
This IC is a compound power supply IC which built in Synchronous Step-down DC/DC converter 2ch, LDO1ch, and P-GOOD2ch.The ripple of the input current is decreased so that the DC/DC converter of 2ch may work by the opposite phase, and a low noise is achieved. Because the output voltage can be set by external resistance, it is possible to use it according to various output conditions.
Features
1. Input Operating Voltage Range 3.0V~5.5V2. Shutdown Supply Current 0.1µA (Typ.)3. Temperature Range −30~+85°C4. DC/DC converters Output Voltage 1.0V~PVIN Accuracy ±2% Maximum Output Current 1.5A / 1ch Oscillator Frequency 2MHz (Typ.) Output Voltage is changeable in external parts. Built-in start/stop sequence circuit. Output OverVoltage Protection function 0.72V (Typ.) Built-in SoftStart circuit 1.5ms (Typ.) Built-in OverCurrent detection timer 1.5ms (Typ.)5. LDO Output Voltage 3.3V Accuracy ±1% Dropout voltage 0.10V (Typ.) Current limit 40mA (Typ.) 6. P-GOOD Input/Output Over Voltage/Low Voltage, Over Current, and Thermal detection.
Package
SQFN-16A
Applications
1. Printer2. Composit device
• Any products mentioned in this catalog are subject to any modification in their appearance and others for improvements without prior notification.• The details listed here are not a guarantee of the individual products at the time of ordering. When using the products, you will be asked to check their specifications.
MITSUMI 2ch Synchronous Step-down DC/DC Converter + 1ch LDO + 2ch P-GOOD MM3558 Series
Block Diagram
Discharge Tr
PVOUT3 P_GOOD2
P_GOOD1
PGND2
SW2
PVIN2
FB2
PGND1
SW1
PVIN1
FB1
EN23
EN1
AGND
AVIN
AVIN
AVIN
Vref
CurrentLimit
SoftStart
SoftStart
ControlLogic
ControlLogic
CurrentLimit COMP
CurrentLimit COMP
CurrentSense AMP
CurrentSense AMP
1.5msTimer
2MHzRamp
Generator
TSD
OVP_OUT(FB1/FB2)
OVP_IN
UVLO
VREF
SW1Current Limit
OSC1
ErrorAMP
ErrorAMP
PWMCOMP
PWMCOMP
OSC2
OSC2
OSC1
SW2Current Limit
AVINP_GOOD
Detect
FB1P_GOOD
Detect
FB2P_GOOD
Detect
P_GOOD2Controler
P_GOOD1Controler
Discharge Tr
• Any products mentioned in this catalog are subject to any modification in their appearance and others for improvements without prior notification.• The details listed here are not a guarantee of the individual products at the time of ordering. When using the products, you will be asked to check their specifications.
MITSUMI 2ch Synchronous Step-down DC/DC Converter + 1ch LDO + 2ch P-GOOD MM3558 Series
Pin Assignment
1 2 3 4
5
6
7
8
16
15
14
13
9101112
SQFN-16A(TOP VIEW)
1 P_GOOD2 9 PGND22 EN1 10 SW23 SW1 11 EN234 PGND1 12 P_GOOD15 FB1 13 PVIN26 TP 14 AVIN7 PVOUT3 15 AGND8 FB2 16 PVIN1
• Any products mentioned in this catalog are subject to any modification in their appearance and others for improvements without prior notification.• The details listed here are not a guarantee of the individual products at the time of ordering. When using the products, you will be asked to check their specifications.
MITSUMI 2ch Synchronous Step-down DC/DC Converter + 1ch LDO + 2ch P-GOOD MM3558 Series
Pin Description
Pin No. Pin name Pin description Internal equivalent circuit diagram
1
12
P_GOOD2P_GOOD1
Power Good output pin
PGND
2
11
EN1EN23
Enable pin for ON/OFF
AVIN
AGND
3
10
SW1SW2
Power switched pin
Discharge TrSW2 Only
PVIN
PGND
4
9
15
PGND1PGND2AGND
Ground pin
AGND
PGND
5
8
FB1FB2
DC/DC output voltage
feedback pin
AGND
AVIN
Err Amp
6 TPTest pin
(Please connect with GND.)
AGND
AVIN
• Any products mentioned in this catalog are subject to any modification in their appearance and others for improvements without prior notification.• The details listed here are not a guarantee of the individual products at the time of ordering. When using the products, you will be asked to check their specifications.
MITSUMI 2ch Synchronous Step-down DC/DC Converter + 1ch LDO + 2ch P-GOOD MM3558 Series
Pin No. Pin name Pin description Internal equivalent circuit diagram
7 PVOUT3 Regulator output pin
AGNDPGND
AVIN
13
16
PVIN2PVIN1
Power supply input pin
PGND
PVIN
IntenalCircuit
SW
14 AVIN Power supply input pin
AGND
AVIN
IntenalCircuit
• Any products mentioned in this catalog are subject to any modification in their appearance and others for improvements without prior notification.• The details listed here are not a guarantee of the individual products at the time of ordering. When using the products, you will be asked to check their specifications.
MITSUMI 2ch Synchronous Step-down DC/DC Converter + 1ch LDO + 2ch P-GOOD MM3558 Series
Absolute Maximum Ratings (Except where noted otherwise Ta=25°C)
Note1 : The values indicate reference values.
Item Symbol Ratings UnitsAVIN Voltage VAVIN −0.3~+6.0 V
PVIN1 Voltage VPVIN1 −0.3~+6.0 VPVIN2 Voltage VPVIN2 −0.3~+6.0 VSW1 Voltage VSW1 −0.6~VPVIN1+0.3 VSW2 Voltage VSW2 −0.6~VPVIN2+0.3 VFB1 Voltage VFB1 −0.3~+6.0 VFB2 Voltage VFB2 −0.3~+6.0 V
P_GOOD1 Voltage VPG1 −0.3~+6.0 VP_GOOD2 Voltage VPG2 −0.3~+6.0 V
EN1 Voltage VEN1 −0.3~+6.0 VEN23 Voltage VEN23 −0.3~+6.0 V
PVOUT3 Voltage VPVO3 −0.3~VAVIN+0.3 VSW1 Maximum Current ISW1 1.8 ASW2 Maximum Current ISW2 1.8 A
P_GOOD1 Maximum Current IPG1 200 mAP_GOOD2 Maximum Current IPG2 200 mAPVOUT3 Maximum Current IPVO3 50 mA
Storage Temperature TSTG −55~+150 °CPower Dissipation (Alone) PD 220 (Note1) mW
Recommended Operating Conditions (Except where noted otherwise Ta=25°C)
Item Symbol Ratings UnitsAVIN Voltage VAVIN 3.0~5.5 V
PVIN1 Voltage VPVIN1 3.0~5.5 VPVIN2 Voltage VPVIN2 3.0~5.5 VSW1 Current ISW1 0~1.5 ASW2 Current ISW2 0~1.5 A
DC/DC Converter Output Voltage (Note2) VDCO 1.0~PVIN VPVOUT3 Current IPVO3 0~10 mA
Operating Temperature TOPR -30~+85 °CJunction Temperature (Note3) TJ 150 °C
Note2 : There is a case to take operation from 1 to 2 when applying to the following condition in addition to the thing without the voltage difference between the input and the output. · Duty 90% or more · Hiside Tr ON resistance × load current > voltage difference between the input and the output 1) If Duty becomes 100%, the output voltage decreases depending on "Input voltage- Hiside Tr ON resistance × load current". 2) There is a case that becomes operation that the switching operates at a cycle different from the oscillatory frequency that looks like the abnormally oscillation.Note3 : Please calculate TJ from ambient temperature TA and power consumption Preferring to the next expression. TJ = TA + P × 62.2 °C/W Thermal resistance 62.2 °C/W is a value when the substrate size mounts on two glass epoxy layer substrate of 90×90×1.6mm3 (copper interconnect rate 90%).
• Any products mentioned in this catalog are subject to any modification in their appearance and others for improvements without prior notification.• The details listed here are not a guarantee of the individual products at the time of ordering. When using the products, you will be asked to check their specifications.
MITSUMI 2ch Synchronous Step-down DC/DC Converter + 1ch LDO + 2ch P-GOOD MM3558 Series
Electrical Characteristics (Except where noted otherwise AVIN=PVIN1=PVIN2=5.0V, EN1=EN23=5.0V, Ta=25°C)
Item Symbol Measurement conditions Min. Typ. Max. UnitsMeasuringCircuit No.
Supply Current1 (DCDC1) IDD1EN1=5V, EN23=0V
FB1=0.65V350 525 µA 2
Supply Current2(DCDC2, PVOUT3)
IDD2EN1=0V, EN23=5V
FB2=0.65V400 600 µA 2
Supply Current(No switching)
IDD3FB1=FB2=0.55V
PVOUT3=No Load600 900 µA 2
Shutdown Current IOFF EN1=EN23=0V 0.1 1.0 µA 2
VIN UVLO Detection Voltage VUVLOD AVIN=4.5V 0V 2.45 2.55 2.65 V 2
VIN UVLO Release Voltage VUVLOR AVIN=0V 4.5VVUVLOD
+100VUVLOD
+150VUVLOD
+200 mV 2
OVP_IN Detection Voltage VOVPID AVIN=5.0V 6.0V 5.6 5.8 6.0 V 2
OVP_IN Release Voltage VOVPIR AVIN=6.0V 5.0VVOVPID
-150 mV 2
OVP_OUT Detection Voltage VOVPOD FB1(FB2)=0.6 0.8V 0.66 0.72 0.76 V 2
OVP_OUT Release Voltage VOVPOR FB1(FB2)=0.8 0.6VVOVPOD
-25 mV 2
EN1, EN23 pin "High"Input Voltage
VENH AVIN/2 V 2
EN1, EN23 pin "Low"Input Voltage
VENL 0.5 V 2
EN1, EN23 Pin Input Current IEN EN=6V 2 µA 2
Thermal Shutdown Detection VTHD No switching 150 °C
Thermal Shutdown Release VTHR No switching 120 °C
DC/DC converter
FB1, 2 Voltage VFBPWMVOUT=1.8V
L=2.7µH, COUT=22µF0.588 0.600 0.612 V 1
FB1, 2 Pin Current IFB FB1=FB2=6V -1.0 +1.0 µA 2
Oscillator Frequency fOSC 1.8 2.0 2.2 MHz 1
Hiside Tr Current Limit (Note4) ILIMSW 1.7 3.0 A 1
Hiside Tr ON Resistance RSWH SW1(SW2)=100mA sink 0.3 0.6 2
Lowside Tr ON Resistance RSWL SW1(SW2)=100mA source 0.25 0.5 2
Soft Start Time tSS Time till it reaches to FB×0.9 0.5 1.5 2.5 ms 1
SW2 Pin Discharge TrON Resistance
RDSW2EN23=0VSW2=5.0V
100 2
Note4 : The parameter is guaranteed by design.
• Any products mentioned in this catalog are subject to any modification in their appearance and others for improvements without prior notification.• The details listed here are not a guarantee of the individual products at the time of ordering. When using the products, you will be asked to check their specifications.
MITSUMI 2ch Synchronous Step-down DC/DC Converter + 1ch LDO + 2ch P-GOOD MM3558 Series
Item Symbol Measurement conditions Min. Typ. Max. UnitsMeasuringCircuit No.
Regulator
PVOUT3 Output Voltage 1 VVO31 PVOUT3=No load 3.267 3.300 3.333 V 1
PVOUT3 Output Voltage 2 VVO32 PVOUT3=10mA 3.252 3.300 3.333 V 1
Line Regulation VLINEPVOUT3=1mA
AVIN=3.4 to 5.5V0.05 0.25 %/V 1
Load Regulation VLOAD 1mA PVOUT3 10mA 5 15 mV 1
Dropout Voltage VIOPVOUT3=10mA
AVIN=3.1V0.10 0.18 V 1
Ripple Rejection 1 (Note5) RR1PVOUT3=1mA
f=1kHz60 dB
Ripple Rejection 2 (Note5) RR2PVOUT3=1mA
f=10kHz40 dB
Output Short-circuit Current (Note5) ILIM VPVO3=0V 40 mA
PVOUT3 Discharge TrON Resistance PVOUT3
RDVO3EN23=0V
PVOUT3=3.3V1 k 2
Power Good
P_GOOD1, 2 Detection Voltage
VPGADMonitor AVIN Voltage
AVIN=2.8 0VVUVLOD
+50 mV 2
P_GOOD1Detection Voltage
VPGFB1DMonitor FB1 Voltage
FB1=0.6 0V0.46 0.50 0.54 V 2
P_GOOD2Detection Voltage
VPGFB2DMonitor FB2 Voltage
FB2=0.6 0V0.46 0.50 0.54 V 2
P_GOOD1, P_GOOD2 Release Voltage
VPGARMonitor AVIN Voltage
AVIN=0 2.8VVPGAD
+100VPGAD
+150VPGAD
+200 mV 2
P_GOOD1Release Voltage
VPGFB1RMonitor FB1 Voltage
FB1=0 0.8VVPGFB1D
+10VPGFB1D
+25VPGFB1D
+40 mV 2
P_GOOD2Release Voltage
VPGFB2RMonitor FB2 Voltage
FB2=0 0.8VVPGFB2D
+10VPGFB2D
+25VPGFB2D
+40 mV 2
P_GOOD1, 2 "L"Output Voltage
VPGOLFB1=FB2=0V
P_GOOD1, 2=10mA0.12 0.30 V 2
P_GOOD1, 2 Pin Sink Current (Note5, 6)
IPGSINKFB1=FB2=0V
P_GOOD1, 2=5V100 150 mA 2
P_GOOD1, 2 Pin Leakage Current
IPGLKFB1=FB2=0.65VP_GOOD1, 2=6V
-1.0 +1.0 µA 2
Note5 : The parameter is guaranteed by design.
Note6 : Please use it under Power dissipation. It shows in 13.TYPICAL APPLICATION CIRCUIT about calculation method of Loss.
• Any products mentioned in this catalog are subject to any modification in their appearance and others for improvements without prior notification.• The details listed here are not a guarantee of the individual products at the time of ordering. When using the products, you will be asked to check their specifications.
MITSUMI 2ch Synchronous Step-down DC/DC Converter + 1ch LDO + 2ch P-GOOD MM3558 Series
Item Symbol Measurement conditions Min. Typ. Max. UnitsMeasuringCircuit No.
Delay time
Start / Stop Delay Time (Note7)
tSTDLY
EN1, 23=0V 3VEN1 : Ch1 enable
EN23 : Ch2, LDO enable10 us 2
P_GOOD Detection Blanking Time During SoftStart (Note7)
tDTDLY_SS5.5×tSS
8.3×tSS
ms 1
P_GOOD Detection Blanking Time (Note7)
tDTDLYAVIN=4.5V VPGAD,
FB1(FB2)=0.6 VPGFB10 us 2
SW1, 2 Current Limit TimerLatch Time (Note7)
tLIMSWDLY 1.5 ms 1
Note7 : The parameter is guaranteed by design.
• Any products mentioned in this catalog are subject to any modification in their appearance and others for improvements without prior notification.• The details listed here are not a guarantee of the individual products at the time of ordering. When using the products, you will be asked to check their specifications.
MITSUMI 2ch Synchronous Step-down DC/DC Converter + 1ch LDO + 2ch P-GOOD MM3558 Series
Measuring Circuit
A
A
A
A
V
V
V
A
FB1
oscilloscope
2.7µH
2.7µH
10µF
10µF
1µF
VOUT11.8V
VOUT21.8V
VIN
22µF
22µF
39pF
39pF
1k
1k
240k
240k
120k
120k
oscilloscope
oscilloscopeoscilloscope
oscilloscope
oscilloscopeFB2
TP
PVOUT3
PVIN1
AGND15
14
13
16
1 2 3 4
5
6
7
8
9101112
AVIN
PVIN2
EN
1
SW
1
PG
ND
1
P_G
OO
D2
P_G
OO
D1
EN
23
SW
2
PG
ND
2
MM3558
(1)
V
A
A A V
V
A
A
VAA
FB1
oscilloscope
10µF
10µF
1µFVIN
1koscilloscope
oscilloscopeoscilloscope
FB2
TP
PVOUT3
PVIN1
AGND15
14
13
16
1 2 3 4
5
6
7
8
9101112
AVIN
PVIN2
EN
1
SW
1
PG
ND
1
P_G
OO
D2
P_G
OO
D1
EN
23
SW
2
PG
ND
2
MM3558
1k
(2)
• Any products mentioned in this catalog are subject to any modification in their appearance and others for improvements without prior notification.• The details listed here are not a guarantee of the individual products at the time of ordering. When using the products, you will be asked to check their specifications.
MITSUMI 2ch Synchronous Step-down DC/DC Converter + 1ch LDO + 2ch P-GOOD MM3558 Series
Timing Chart(1) Each output start, stop timing
EN1
EN2
VOUT1
VOUT2
FB1
FB2
PVOUT3
P_GOOD1
P_GOOD2
5.5×tSS
3.3V
0.54V 0.50V 0.525V
0.54V 0.50V 0.525V
0.6V 0.6VSoftStart
0.6V 0.6VSoftStart
Output up
Output down
Output up
Output down
Discharge(100 )
Discharge(1k )
tDTDLY=10us
5.5×tSS tDTDLY=10us
tSTDLY=10us
tSTDLY=10us
tSTDLY=10us
tSTDLY=10us
AVIN=PVIN1=PVIN2=5.0V
The delay time (10us typ.) has been set for the input of enable terminal EN1 and EN23.Therefore, IC-output doesn't response when a short signal of the cycle is input to an enable terminal at delay time.
• Any products mentioned in this catalog are subject to any modification in their appearance and others for improvements without prior notification.• The details listed here are not a guarantee of the individual products at the time of ordering. When using the products, you will be asked to check their specifications.
MITSUMI 2ch Synchronous Step-down DC/DC Converter + 1ch LDO + 2ch P-GOOD MM3558 Series
P_GOOD2P_GOOD1
P_GOOD2P_GOOD1
PVOUT3
PVOUT3
(VOUT2)FB2
(VOUT2)FB2
(VOUT1)FB1
(VOUT1)FB1
PVINAVIN
PVINAVIN
2.55V
2.60V
0.54V
0.54V
0.54V
0.54V
0.6V 0.6V
0.6V
3.3V
2.7V
5.0V
5.0V
0.6V
0.6V
3.3V
5.0V5.8V5.65V
0.6V
3.3V
SoftStart
SoftStart SoftStart
Discharge(100 )
Discharge(1k )
tDTDLY=10us
t<tDTDLY(=10us)
5.5×tSS 5.5×tSS
AVIN=PVIN1=PVIN2=EN1=EN23
Discharge(100 )
Discharge(1k )
FB pin voltage decreases to discharge electricityby low side Tr when starting.
• UVLO detection, OVP_IN detection
(2) Protected operation
When AVIN rises and the input overvoltage is detected, VOUT1, 2, and PVOUT3 are turned off.Operation can be returned by decreasing AVIN.
The P_GOOD changes to "L" in the condition of the AVIN P_GOOD detecting voltage (Monitor AVIN voltage) after delay time. However, it doesn't respond for a signal of the cycle short following delay time.
• Any products mentioned in this catalog are subject to any modification in their appearance and others for improvements without prior notification.• The details listed here are not a guarantee of the individual products at the time of ordering. When using the products, you will be asked to check their specifications.
MITSUMI 2ch Synchronous Step-down DC/DC Converter + 1ch LDO + 2ch P-GOOD MM3558 Series
P_GOOD2P_GOOD1
PVOUT3
VOUT2
FB2
(VOUT1)FB1
EN23
EN1
0.6V
3.3V
0.6V
0.6V
0.72V0.6V
0.72V
0.54V
0.54V
0.54V
0.54V
SoftStart
SoftStart
SoftStart
SoftStart
tSTDLY=10us tSTDLY=10us
5.5×tSS 5.5×tSS
FB2 pin voltageabnormal rise
FB1 pin voltageabnormal rise
AVIN=PVIN1=PVIN2=5.0V
Discharge(100 )
Discharge(1k )
Discharge(100 )
Discharge(1k )
FB pin voltage decreases to discharge electricityby low side Tr when starting.
It doesn't returnbecause both EN1and EN23 not "L".
• OVP_OUT detection
The output overvoltage protection circuit works when the DC/DC converter voltage of the FB pinexceeds 0.72V(TYP.), the switching of SW1 and SW2 stops, the PVOUT3 output is turned off,and the state is maintained.
It is necessary to decrease AVIN below VIN UVLO detection voltage so that the FB pin may release(FB1, FB2< 0.72V) when released and the state of the latch from the state of the output overvoltage or to make both EN1 and EN23 "L".
• Any products mentioned in this catalog are subject to any modification in their appearance and others for improvements without prior notification.• The details listed here are not a guarantee of the individual products at the time of ordering. When using the products, you will be asked to check their specifications.
MITSUMI 2ch Synchronous Step-down DC/DC Converter + 1ch LDO + 2ch P-GOOD MM3558 Series
VOUT
SWCurrent
SWVoltage
Normal operation Normal operationCurrent limit operation
Current limit operation
SwitchingStop
0V
0A
1.7A
t<1.5ms t=1.5ms
• Over current protection for DC/DC converter
• Over current protection for PVOUT3
(3) Over current protection
When a current limit is continuously detected between 1.5ms, the DC/DC converter maintainsOFF state with the short-circuit protection circuit. And, both SW1 and SW2 switching are stopped, and the PVOUT3 output is turned off, too.
The output of the DC/DC converter and PVOUT3 returns by turning on both the re-turning on or EN1and EN23 power supplies again.
Even if over-current protection of PVOUT3 is effective, it does not have the infl uence on DC/DC converter operation. The output of PVOUT3 will also return, if over-current protection of PVOUT3 is canceled.
• Any products mentioned in this catalog are subject to any modification in their appearance and others for improvements without prior notification.• The details listed here are not a guarantee of the individual products at the time of ordering. When using the products, you will be asked to check their specifications.
MITSUMI 2ch Synchronous Step-down DC/DC Converter + 1ch LDO + 2ch P-GOOD MM3558 Series
Flow Chart
Power ON
OUT1, 2, 3 OFFVREF OFF
Protection Disable
OUT1, 2, 3 OFF(Automatic recovery
Disable)
OUT1, 2, 3 OFF(Automatic recovery
Enable)(=OVP_IN or UVLO or TSD Detected)
P_GOOD1=Hi-Z(P_GOOD2)
P_GOOD1=L(P_GOOD2)
P_GOOD1 and 2=L
OVP_OUTor Over Current
Detected
Any ofprotection signal
Detected
Any ofprotection signal
Detected
AVIN andFB1(FB2) P_GOOD
Detected
FB1(FB2) P_GOODDetected
AVIN P_GOODDetected
EN1=Hor
EN23=H
EN1=Land
EN23=L
VREF ONProtection Enable
EN1=H(EN23)
EN1=L(EN23)
EN1=L(EN23)
EN1=H(EN23)
OUT1 ON(OUT2, 3)
OUT1 OFF(OUT2, 3)
Automatic recoveryEnable
OUT1 ON (Recovery)(OUT2, 3)
No
Yes
No
Yes
No
Yes
No
Yes
No
Yes
EN1=Land
EN23=L
UVLODetected
OVP_IN orUVLO or TSDUndetected
No
Yes
No
Yes
No
Yes
No
Yes
No
No
Yes
No
Yes
No
Yes
No
Yes
No
Yes
Yes
• Any products mentioned in this catalog are subject to any modification in their appearance and others for improvements without prior notification.• The details listed here are not a guarantee of the individual products at the time of ordering. When using the products, you will be asked to check their specifications.
MITSUMI 2ch Synchronous Step-down DC/DC Converter + 1ch LDO + 2ch P-GOOD MM3558 Series
Application Circuit
AGND
AVIN
MM3558
1µF
3.3V
"H" / "L"
"H" / "L"
22µF 22µF
R11
C11 C21
VIN
1k 1k
R12
R21
R22
2.7µH 2.7µH
10µF 10µF
1µF
VOUT1 VOUT2
VIN3.0V to 5.5V
P_GOOD1
FB2
SW2
PGND2
PVIN2
P_GOOD2PVOUT3
EN23
EN1
FB1
SW1
PGND1
PVIN1
P_GOOD1
P_GOOD2
Application notes
(1) Setting of output voltage · The output voltage can be calculated by the following expressions. VOUT1=0.6×(1+R12/R11) · Please set not to exceed R11+R12=1M from the reason for stability. · Please adjust for Zero points fz of the feedback loop to become 20kHz the value of C11 for the phase compensation. Zero points fz are calculated by the following expression. fz=1/(2× ×C11×R12) · It becomes the best by adjusting fz according to the value of the usage, inductance, and the output capacity. · Please set VOUT2 as well as VOUT1.
(2) When PVOUT3 is not used · The capacitor of 1uF is recommended to be connected with the terminal even when PVOUT3 is not used. · There is a possibility of connecting it with the problem of an increase of the supply current etc. when the terminal is opened or it is used while it is short-circuited in the power supply.
• Any products mentioned in this catalog are subject to any modification in their appearance and others for improvements without prior notification.• The details listed here are not a guarantee of the individual products at the time of ordering. When using the products, you will be asked to check their specifications.
MITSUMI 2ch Synchronous Step-down DC/DC Converter + 1ch LDO + 2ch P-GOOD MM3558 Series
(3) About the calculation of IC loss · The substrate size mounts on two glass epoxy layer substrate (90% of rate of copper interconnect) to which it is referring in Note3 of the RECOMMENDED OPERATING CONDITIONS is computed for an example. · The power dissipation at 25°C to 150°C is computable with about 2.01 W from thermal resistance 62.2°C/W. For example, when carrying out the pull-up of the P_GOOD terminal to an external power supply, if it connects with 5V power supply directly, 150 mA (typ.) sink current will flow. As a loss of a P_GOOD terminal, PP_GOOD = 5V x 150mA = 0.75W occur. When P_GOOD1 and 2 both sides are set as the same conditions, since 1.5W (typ.) loss occurs, it is the calculation which generates heat about 93.3°C. By element variation, temperature variation, other losses in a circuit, and thermal resistance by substrate conditions, since a loss/calorific value is changed, please set up the conditions of a P_GOOD terminal after fully examining a loss and calorific value by the set of use. (4) About the output operation of 1.0V or less · If an input-and-output voltage difference is large and ON Duty falls, it becomes impossible to take operation in the PWM mode stable like following figure A. The stability of input voltage of operation over 1.0V or less is shown in fi gure B.
VOUT50mV/div(offset : 0.8V)
SW2V/div
VIN (V)
VO
UT
(V)
1.0
0.9
0.8
Stable area
Unstable area
3.0 3.5 4.0 4.5 5.0 5.5 6.0
Representation data
Figure.A Unstable operation waveform
Figure.B 1V or less output vs VIN operation stability
• Any products mentioned in this catalog are subject to any modification in their appearance and others for improvements without prior notification.• The details listed here are not a guarantee of the individual products at the time of ordering. When using the products, you will be asked to check their specifications.
MITSUMI 2ch Synchronous Step-down DC/DC Converter + 1ch LDO + 2ch P-GOOD MM3558 Series
Characteristics (Except where noted otherwise Ta=25°C)
AVIN (V)
IDD
2 (µ
A)
600
500
400
300
200
100
00 1 2 3 4 5 6
Supply Current 2 (EN1=0V, AVIN=PVIN1,2=0 6.0V)
Supply Current 1 (EN23=0V, AVIN=PVIN1,2=0 6.0V)
AVIN (V)
IDD
1 (µ
A)
500
400
300
200
100
00 1 2 3 4 5 6
Supply Current (EN1=EN23=5V, AVIN=PVIN1,2=0 6.0V)
AVIN (V)
IDD
3 (µ
A)
900
800
700
600
500
400
300
200
100
00 1 2 3 4 5 6
Shutdown Current (EN1=EN23=0V, AVIN=PVIN1,2=0 6.0V)
AVIN (V)
IOF
F (µ
A)
5
4
3
2
1
00 1 2 3 4 5 6
Line regulation VOUT1(1.8V) (AVIN=PVIN1=0 6.0V)
AVIN (V)
VO
UT
1 (V
)
1.90
1.85
1.80
1.75
1.702 3 4 5 6
• Any products mentioned in this catalog are subject to any modification in their appearance and others for improvements without prior notification.• The details listed here are not a guarantee of the individual products at the time of ordering. When using the products, you will be asked to check their specifications.
MITSUMI 2ch Synchronous Step-down DC/DC Converter + 1ch LDO + 2ch P-GOOD MM3558 Series
IOUT2 (mA)
VO
UT
2 (V
)
1.30
1.25
1.20
1.15
1.100.1 1 10 100 1000 10000
Load regulation VOUT2(1.2V) (AVIN=PVIN2=5.0V, IOUT=0 2000mA)
Load regulation VOUT1(1.8V) (AVIN=PVIN1=5.0V, IOUT=0 2000mA)
IOUT1 (mA)
VO
UT
1 (V
)
2.00
1.90
1.80
1.70
1.60
1.500.1 1 10 100 1000 10000
Efficiency VOUT1(1.8V) (AVIN=PVIN1=5.0V,EN23=0,IOUT=0 2000mA)
IOUT1 (mA)
Eff
icie
ncy
(%)
100
80
60
40
20
00.1 1 10 100 1000 10000
Efficiency VOUT2(1.2V) (AVIN=PVIN2=5.0V,EN1=0,IOUT=0 2000mA)
IOUT2 (mA)
Eff
icie
ncy
(%)
100
80
60
40
20
00.1 1 10 100 1000 10000
Line regulation PVOUT3 (AVIN=0 6.0V, IOUT=1mA)
AVIN (V)
PV
OU
T3
(V)
3.4
3.3
3.2
3.1
3.0
2.9
2.82 3 4 5 6
Load regulation PVOUT3 (AVIN=5.0V, IOUT=0 100mA)
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.00.1 1 10 100
IOUT (mA)
PV
OU
T3
(V)
• Any products mentioned in this catalog are subject to any modification in their appearance and others for improvements without prior notification.• The details listed here are not a guarantee of the individual products at the time of ordering. When using the products, you will be asked to check their specifications.
MITSUMI 2ch Synchronous Step-down DC/DC Converter + 1ch LDO + 2ch P-GOOD MM3558 Series
IDD
2 (µ
A)
600
500
400
300
200
100
0
Temperature (ºC)
−40 −20 0 20 40 60 80 100
Supply current 2 - Temperature Supply current 1 - TemperatureID
D1
(µA
)
500
400
300
200
100
0
Temperature (ºC)
−40 −20 0 20 40 60 80 100
Supply current - Temperature
IDD
3 (µ
A)
900
800
700
600
500
400
300
200
100
0
Temperature (ºC)
−40 −20 0 20 40 60 80 100
Shutdown current - Temperature
IOF
F (µ
A)
2.5
2.0
1.5
1.0
0.5
0.0
Temperature (ºC)
−40 −20 0 20 40 60 80 100
FB1 Voltage - Temperature (AVIN=PVIN1=5.0V, IOUT=300mA)
VF
B1
(V)
0.64
0.62
0.60
0.58
0.56
Temperature (ºC)
−40 −20 0 20 40 60 80 100
FB2 Voltage - Temperature (AVIN=PVIN1=5.0V, IOUT=300mA)
VF
B2
(V)
0.64
0.62
0.60
0.58
0.56
Temperature (ºC)
−40 −20 0 20 40 60 80 100
• Any products mentioned in this catalog are subject to any modification in their appearance and others for improvements without prior notification.• The details listed here are not a guarantee of the individual products at the time of ordering. When using the products, you will be asked to check their specifications.
MITSUMI 2ch Synchronous Step-down DC/DC Converter + 1ch LDO + 2ch P-GOOD MM3558 Series
fOS
C (M
Hz)
2.2
2.1
2.0
1.9
1.8
Temperature (ºC)
−40 −20 0 20 40 60 80 100
Oscillator Frequency - Temperature PVOUT3 - Temperature (AVIN=5.0V, IOUT=No Load)
PV
OU
T3
(V)
3.50
3.40
3.30
3.20
3.10
Temperature (ºC)
−40 −20 0 20 40 60 80 100
EN1 Start-Up (AVIN=PVIN1=5.0V, EN1=0 5V)
(1ms/div)
EN1(1V/div)
VOUT1(0.5V/div)
P_GOOD1(1V/div)
EN23 Start-Up (AVIN=PVIN2=5.0V, EN23=0 5V)
(1ms/div)
EN23(1V/div)
VOUT2(0.5V/div)
PVOUT3(0.5V/div)
P_GOOD2(1V/div)
Switching Operation (AVIN=PVIN1=5.0V)
(200ns/div)
VOUT1(20mV/div)
SW1(1V/div)
• Any products mentioned in this catalog are subject to any modification in their appearance and others for improvements without prior notification.• The details listed here are not a guarantee of the individual products at the time of ordering. When using the products, you will be asked to check their specifications.
MITSUMI 2ch Synchronous Step-down DC/DC Converter + 1ch LDO + 2ch P-GOOD MM3558 Series
(10µs/div)
SW1(1V/div)
VOUT1(20mV/div)
IOUT1(0.1A/div)
(AVIN=PVIN1=5.0V, VOUT1=1.8V, IOUT1=500mA 50mA) Load Transient Response
(AVIN=PVIN1=5.0V, VOUT1=1.8V, IOUT1=50mA 500mA)
(10µs/div)
SW1(1V/div)
VOUT1(20mV/div)
IOUT1(0.1A/div)
(AVIN=PVIN2=5.0V, VOUT2=1.2V, IOUT2=50mA 500mA)
(10µs/div)
SW2(1V/div)
VOUT2(20mV/div)
IOUT2(0.1A/div)
(AVIN=PVIN2=5.0V, VOUT2=1.2V, IOUT2=500mA 50mA)
(10µs/div)
SW2(1V/div)
VOUT2(20mV/div)
IOUT2(0.1A/div)