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Handheld Solutions. Toxic Gas Handheld – The Analog Sections . Low Power, Precision Signal Chain. ISL28194/5. ISL88001/2/3. ISL28194/5. ISL12030. ISL28194/5. ISL26132. ICL3238E. ISL28194/5. EL8170/72 ISL28230. ISL6118 /19. Fuel Gauge: ISL6295 Li-Ion charger: ISL9205 - PowerPoint PPT Presentation
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SIMPLY SMARTER™
HANDHELD SOLUTIONS
2
Toxic Gas Handheld – The Analog Sections Low Power, Precision Signal Chain
ISL28194/5
ISL28194/5
ISL28194/5
EL8170/72ISL28230
ISL28194/5
ISL26132
ISL21070/80ISL60002
ISL88001/2/3
LDO: ISL80101/A and ISL9021Buck Converters: ISL8009A and ISL9104
ICL3238E
ISL6118 /19
ISL12030
Fuel Gauge: ISL6295Li-Ion charger: ISL9205Charging Safety: ISL9200, ISL9212
3
Toxic Gas, Oxygen, Heat Sensors – Analog Front EndThe Sensors• Combustible Gas Sensors – 3
node Amperometric sensor – Examples: CO, H2, H2S−Working electrode (also
called the sensing electrode) is designed to optimize the oxidation or reduction of the toxic gas to be measured.
−Reference electrode anchors the working electrode potential.
−Counter electrode (EA ) balances the reaction of the working electrode. If the working electrode oxidizes the gas, then the counter electrode must reduce some other molecule to generate an equivalent current.
• Oxygen Sensor – Current outputAnalog Front End Requirements
• Low Power Op Amps, Low Bias Current− ISL28194/5 Transimpedance amp for the gas and oxygen sensor, a buffer/driver for the gas
sensor, gain amps stages• Low Power Instrumentation Amps
− EL8170/72 high gain, high CMRR of heat bead sensor
ISL28194/5
EL8170/72
ISL28194/5
ISL28194/5
ISL28194/5
• Heat Bead – Bridge type voltage output
4
ISL28194/ISL28195: MicroPower, RRIO Op Amp
Features• MicroPower • Rail-to-rail Input/Output• Enable pin available
Applications• 2 cell alkaline battery
powered systems• Window comparators• Threshold detectors• Low power sensors
VOS (max) TCVOS (typ) IB (max) en @ 1kHz GBW IS (max)
VS Temp Range ESD (HBM)
2mV 1.5µV/°C 80pA 150nV/√Hz 10kHz 1.3µA 2.4V to 5.5V -40°C to 125°C 3kV
VOS (max) TCVOS (typ) IB (max) en @ 100Hz
GBW IS (max)
VS Temp Range ESD (HBM)
2mV 1.5µV/°C 80pA 265nV/√Hz 2.5kHz 450nA 2.4V to 5.5V -40°C to 125°C 3kV
ISL28194
ISL28195
For Precision Alternatives, see ISL28233 or ISL28230
5
EL8170/EL8172: Instrumentation Amps
VOUT
Part Number
Single EL8170* EL8172*Dual ISL28270 ISL28272Quad ISL28470
Supply Voltage (V)Min 2.4 2.4Max 5 5
Rail-To-RailIn Yes Yes
Out Yes YesShutdown Y Y
Min Gain (V/V) 100 100Vos Max @ 25°C mV 0.15 0.5
TCVos Typ µV/°C 0.7 0.7Ib Max @ 25°C nA 2 0.03
CMRR min @ 25°C dB 90 80PSRR min @ 25°C dB 90 80
Gain Error Type % 0.5 0.19Is Max @ 25°C µA 78 78
-3dB BW kHz 240 100Slew Rate V/µs 0.5 0.5
Noise 0.1 to 10Hz µVpp 3.5 6Voltage Noise @ 1kHz nV/√Hz 60 78Current Noise @ 1kHz fA/√Hz 370 200
Temp Range °C -40 to 125 -40 to 125
PackageSOIC S SQSOP D/Q D
Price @ 1kpcs
Single $1.20 1.14Dual $1.84 $1.84 Quad $2.33
Heat bead
IN+
0Vto 2.5VIN -
FB+
FB-
5V+ VOUT
Rf
Rg
VOUT = ( 1 + )RfRg
VIN
eN(0.5Hzto 100Hz Bandwidth)
= 0.04mVrms
SeeApplication Note 1298
EL8170InstrumentationAmp
EL8170
Single SupplyRail-Rail Input andOutputLowPower:95
Performance• Supply Current/Amp :
60µA • Single Supply Operation:
2.4V to 5.5V• Rail-to-Rail Input &
Output • CMRR : Typical 110dB• Low Offset Voltage & Bias
Current• Bipolar VOS < 150µV, IB < 1.5nA• PMOS VOS < 500µV, IB < 30pA
SingleChannel
DualChannel
QuadChannel
High GainApplications
(G > 100)
Low GainApplications
(G > 10)
Bipolar Input
Bipolar Input
MOSInput
MOSInput
EL8170 ISL28270 ISL28470
EL8172 ISL28272
ISL28273
ISL28271
EL8173
EL8171
ISL28274
SingleChannel
DualChannel
QuadChannel
High GainApplications
(G > 100)
Low GainApplications
(G > 10)
Bipolar Input
Bipolar Input
MOSInput
MOSInput
EL8170 ISL28270 ISL28470
EL8172 ISL28272
ISL28273
ISL28271
EL8173
EL8171
ISL28274
6
Toxic Gas Handheld – Power Sections
ADC
Power source can be a stack of alkaline, NiCad batteries, or a Li-ion battery, or even a USB supply. Basically input can be anywhere from 1.8V to 6V.Small power loss is the key as devices need to run for long hours.
Power : Focus on low Iq and high efficiency partsISL9021: Wide Vin low Iq single LDOISL9103/4: Low Iq high efficiency switching regulator
In high end models, USB regulation and protection IC can be promoted: ISL80121: 1A ultra low drop out LDO with fixed 5V output
7
ISL9021: Single Low VIN, High PSRR 250mA LDO• Description
– Single low input voltage, high PSRR LDO capable of delivering up 250mA of continuous current
• Features– Wide input dynamic range of
1.5V – 5.5V efficiently operates from buck output
– High PSRR at very high frequencies reduces DCDC output ripple and makes it ideal to be used as a buffer to any high switching frequency DCDC.
– Very good noise performance (14µVrms @ VOUT = 1.5V)
– Output voltage as low as 0.9V– Very small packages
BUCK
CONVERTER
VIN VOUT
FB
C1
BATT
+
LOW PSRR
LDO
VIN VOUT
PA OR
CPU CORE
VCC
2MHZVV
3.7V 1.8V 1.2V
Typical Application and Why Low VIN & High PSRR is Needed
1.6x1.6 µTDFN
4-Ball WLCSP
ISL9021ISL9103/4Hi PSRR
LDO
Depending on input source, switching regulator at first stage may not be required. Due to the ISL9021’s wide input range, it can operate from a variety of batteries.
8
ISL28006
RS+
RS-
Vout FB Ground
Vss
Load
ADJ.OptionOnly
R1R2
+
Vsense
-
VIN(VCM): -50mV to 28V
VSS: 2.7V to 28V
Vout Vsense *G(where G is the gain)
•Ability to operate rail-rail for both low-side and high-side sensing •Excellent for low ohmic measurements
Precision (ISL28006) and Low Cost (ISL28005 Options
Typical Application: Multiple Output Power Supply
Applications• Low Ohmic Shunt Sense • Power Mgt /Monitors• Power Distribution and
Safety• DC/DC, AC/DC Converters• Battery Mgt /Charging• Automotive • Alternative Energy• Portable Applications
Part Number ISL28005 ISL28006
Supply Voltage (V)Min 2.7 2.7Max 28 28
Input Common Mode Range (V)
Min 0 0Max 28 28
Vos Max @ 25°C µV 500 250Vos Max Temp µV 500 300
CMRR min Temp dB 105 105PSRR min Temp dB 90 90
Gain Range V/V 20, 50, 10020, 50, 100, Adj (20-100)
Gain Accuracy @ 25°C (%) 2 0.7
Gain Accuracy Temp (%) 3 1Is Max @ 25°C µA 59 62Is Max Temp µA 59 62
GBW kHz 180 180
TempRange °C -40 to 125 -40 to 125
Package SOT23 SOT23Price @ 1kpcs $0.75 $0.99
ISL28006/ISL28005: Micro-Power, Precision Low/High Side Current Sense Amplifier
9
Barcode Scanner – Part 1
2 Solution:ISL28005/6 Low Power, Integrated Current sense amplifier
ISL28x33/ISL28x30 Low Power, Precision Amplifier
Q: How do you monitor power or sense current?
5Solution:ISL28x13/ISL28x14 Low Cost, Low Power, GP Op Amp
Q: Do you signal condition the output from the receiving detector with an op amp?
Q: What kind of charging circuit is needed for your device?1
Q: Are you concerned about the noise performance of your power supply? 6
Solution: ISL80101A 1A LDO with programmable current limit
Q: How much current do you need from your switching regulator?
3Solution: ISL8012 Low Iq , 2A switching regulator
Q: How do you drive your motor?
Solution: HIP4020 Low voltage Full bridge driver with 0.5A integrated FET.
4
Q: Do you need a low power SAR converter?7
Solution: ISL2674501 Msps SAR converters @ 3mW power consumptin
10
ISL2800X Design Example: 20A Max Current; 10V FS Output; G = 100
• Given these:• Full scale sense current (ISENSE FS) = 20A• Full scale output voltage (VOUT FS) = 10V• Current sense amplifier gain (G = 100)
• All that is needed is RSENSE to complete the design:
• Calculate full scale input voltage (VSENSE FS) = VOUT FS/ Gain = 10V/100 = 0.1V
• Calculate RSENSE = VSENSE FS/ ISENSE FS = 0.1V/ 20A = 5mΩ VS
RSENSE = 5mΩ TYPE WSL2512
1W I-sense resistorwith PCB copper Kelvin Contacts
ISENSEFS = 20A +-VRS+
2V to 28V Load
ISL28005ISL28006
VOUT0V to +10V FS
VSENSE FS = 0.1V
11
Barcode Scanner – Part 2
7Solution:ISL21080 Low Cost, Low Power, GP Voltage Reference
Q: Are you using an external voltage reference for the converter?
Q: Does your device get power from a USB port?
8Solution: ISL80121: 5V out, 1A LDO with programmable current limit to meet USB spec.ISL6119: Dual USB port power supply controller with UV lockout and Fault reporting
Q: Do you monitor/supervise your power rail(s)?
9Solution: ISL88016 voltage supervisor with pin selectable voltage trip pointsISL9201: High integration single cell charger with power presence and EOC indicatorISL6295: low voltage fuel gauge
12
ISL80121: High Performance 1A LDO with Adjustable Current Limit
Description• High Performance 2.2V to 6V VIN, single
output LDO capable of 1A current drive
Features• Designed for accurate current limiting • Very fast load transient response • Tight ±1.8% VOUT accuracy over
-40ºC < TJ < 125ºC • High PSRR over full-rated load current • 100μVrms low output noise from 300Hz
to 300kHz • Less than 1µA shutdown current (typ)• PGOOD, Enable, Short-Circuit & Reverse
Current Protection, and Over-Temperature Shutdown Capability
• 10-Ld 3x3 DFN package
13
ISL80121: Design to Protect Your Load
These features are ideal for USB powered applications such as USB Hubs/ports, printers, modems, STBs, PCs, zip drives, external HDs, speakers, VOIP phones, portable patient monitoring devices, DPF, monitors, etc. They can also be used for other types of ports that require current limiting.
Protection from
unregulated USB
source port!
Feature Benefit
Adjustable Current Limit
•Allows the user to set the current limit to keep the maximum output current below a desirable level for each individual application
Soft Start •Limits the inrush current during start-up
Fast Transient •Limits voltage overshoot and leads to excellent AC accuracy
14
Mobile Smart Device – Part 1
Q: Do you monitor/supervise your power rail(s)?
Q: Are you concerned about the noise performance of your power supply?
Solution: ISL80102 2A LDO with adjustable soft start
Q: Do you provide power to a USB port or does your device get power from a USB port?Solution: ISL80121: 5V out, 1A LDO with programmable current limit to meet USB spec.ISL6185:Dual USB port power supply controller with accurate current limit and reverse current blocking.
Solution: ISL9230High power Li-Ion Battery chargerwith iPath management
Solution: ISL88011 Dual voltage monitoring with adjustable power on reset.
Q: What kind of charging circuit is needed for your device?
4
3
2
1
15
ISL9230: Charger IC with iPathDescription
• Full iPath™ management, provides power to the system while simultaneously charging the battery with up to 1.5A.
Features• 40mΩ internal iPath™ FET reduces loss
when battery is supplying bus.• Autonomous charging and system
current control simplifies design effort.• 26V Max VIN with built in OVP at 6.6V to
protect battery and system circuits.• Intelligent timeout interval based on
charge current prevents premature timeout when system is operational.
• Programmable input current limit prevents the source from collapsing during system high current operations.
16
ISL9230: iPath Management
• How does it work?• At given current limit, control core continuously monitors the output voltage. Actions are based on three conditions:
– VOUT holds steady, meaning available current is adequate• Deliver needed current to both paths
– VOUT starts to drop, meaning available current is not adequate• Reduce ICHG until VOUT stops dropping
– VOUT continues to drop to below VBAT level, meaning available current is far below demand• The battery starts providing current
to the load instead of charging.
AC
VBAT
VOUT
IREF
TIME
GND
To SysInput
Q1
Q2
IMIN
Temperature100OC
IT
IR
I SEN
TimeA
ILIM
ISYS
CHGI
BC
17
Mobile Smart Device – Part 2
Solution: ISL29028ALow-power Ambient Light and Proximity Sensor with intelligent interrupt and sleep modesSolution: ISL29023Low-power digital Ambient Light Sensor with Interrupt Function for light sensor-only requirements
Q: Do you control the backlight based on ambient light and proximity to save power?
Solution:ISL21080 or ISL21010 Low Cost, Low Power, GP Voltage ReferenceOffers the most variety Vout options in the industry
Q: Do you use voltage references?7
Q: How much current do you need from your switching regulator?Solution: ISL8022 2A/1.7A dual synchronous buck regulator with PFM mode for higher light load efficiency
6
5
18
ISL8022: 2A/1.7A Dual Synchronous Buck Regulator
• Description• 2A/1.7A Dual Output, Synchronous Buck Regulator
with selectable PFM/PWM mode operation• Features
• VIN Range: 2.7V to 6V• VOUT Range:0.6V to Vin• 12 Ld 4x3 DFN Package• 2A:1.7A Guaranteed Output Current per Channel • 180° Out-of-Phase Operation
− Reduces Filter requirements• Selectable Forced PWM & PFM Mode (Power Save
Mode)• Synchronization to External Clock – Up to 4MHz• Independent EN for both Channels and Single PGOOD• Current Mode Control with Internal Compensation• Start-up in Pre-Biased Load
19
ISL29028A: Low Power ALS & Proximity Sensor with Intelligent Interrupt and Sleep Modes
• Features• Works under all light sources• Dual ADC architecture
• Ambient Light Sensing• Ideal light sensor response
• Proximity Sensing• 850nm and 940nm LED compatible• Ambient IR noise cancellation
• Intelligent and Flexible Interrupts• Independent ALS/Prox interrupt thresholds• Selectable persist control
• Ultra Low Power• 138μA (Typ) including IR LED current
• Easy to Use• Set registers; wait for interrupt• I2C (SMBus compatible) output• Small package - 2.0x2.1x0.7
20
ISL29023: Ultra Low Lux Digital ALS
• 4 Gain selectable ALS ranges– G1: 0.015 to 1,000Lux
65counts/Lux! – G2: 0.06 to 4,000Lux– G3: 0.24 to 16,000Lux– G4: 0.96 to 64,000Lux
• Low power (<65µA) – <1µA in Shutdown
• 16-bits output resolution • Ideal ALS spectral response• Flicker and noise rejection• Temperature compensated• ALS interrupt pin
– Hi/Lo Thresholds• 2.0 x 2.1 x 0.7mm ODFN-6L
21
E-Power Meter
Q: How much current do you need from your switching regulator?Solution: ISL8088
0.8A/0.8A dual synchronous buck regulator with PFM mode and soft stop
4
Q: Are you concerned about the noise performance of your power supply?
Solution: ISL9007 400mA High PSSR LDO with short circuit protection
3
Solution: ISL21080 or ISL21010 Low Cost, Low Power, GP Voltage Reference
Q: Are you using an external voltage reference for the µP?2
Solution: ISL29028ALow-power Ambient Light and Proximity Sensor with intelligent interrupt and sleep modesISL29023Low-power digital Ambient Light Sensor with Interrupt Function for light sensor-only requirements
Q: Do you control the backlight based on ambient light and proximity to save power?
5
Solution:ISL28005/6 Low Power, Integrated Current sense amplifierISL28133/ISL28130 Low Power, Precision Amplifier
Q: How do you monitor power or sense current?1
22
ISL8088: High Efficiency Dual Buck Regulator
• Description• 800mA, dual Output, Synchronous Buck Regulator
with selectable PFM/PWM mode operation.• Features
• Vin Range:2.7V to 6V• Vout Range: 0.6V to Vin• 800mA Guaranteed Output Current per Channel • 180° Out-of-Phase Operation• High Switching Frequency – 2.25MHz• Selectable Forced PWM and PFM Mode (Power Save
Mode)• Synchronization to External Clock – Up to 4MHz• Independent EN and PGOOD for both Channels • Current Mode Control with Internal Compensation• Start-up in Pre-Biased Load• 12 Ld 4x3 DFN PackageNote: Pin-to-Pin Compatible with LTC3407-2
23
ISL9110/2: 1A Synchronous Buck-Boost RegulatorFeatures• Seamless Transition from Buck Boost• Peak Current of 2.0A for each MOSFET• Input battery range of 1.8V to 5.5V• Fully Synchronous in any Operating Mode• Adjustable Output Voltage down to 0.8V • High Switching Frequency• Internal Digital Soft Start• Battery monitor• Pulse Frequency Modulation (PFM) for Light Load• Over Current Protection and Thermal Shutdown• Industrial Temperature Range• Tiny Thermally Enhanced QFN Lead-Free Package
PVIN
GND
SCLK
PGND
FB
VOUTLX1 LX2Vin=1.8V-5.5V
Cin
2.2uH
R1
R2
Cout
Vout=3.3V/1A
EN
ISL9112
SDA
/BAT
VDD
32.4K
100K
10uF10uF R3
100KVIN
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