HANDHELD SOLUTIONS

SIMPLY SMARTER

™

Toxic Gas Handheld – The Analog Sections Low Power, Precision Signal Chain

ISL28194/5 ISL88001/2/3 ISL28194/5 ISL12030 2 EL8170/72 ISL28230 Fuel Gauge: ISL6295 Li-Ion charger: ISL9205 Charging Safety: ISL9200, ISL9212 ISL28194/5 ISL28194/5 ISL26132 ICL3238E ISL6118 /19 ISL21070/80 ISL60002 LDO: ISL80101/A and ISL9021 Buck Converters: ISL8009A and ISL9104

Toxic Gas, Oxygen, Heat Sensors – Analog Front End

The 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 output • Heat Bead – Bridge type voltage output ISL28194/5 ISL28194/5 ISL28194/5 ISL28194/5 EL8170/72 3 Analog 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/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 ISL28194 V OS (max) TCV OS (typ) I B (max) 1.5µV/°C 80pA 2mV ISL28195 V OS (max) 2mV TCV OS (typ) 1.5µV/°C I B (max) 80pA e n @ 100Hz 265nV/√Hz For Precision Alternatives, see ISL28233 or ISL28230 GBW 2.5kHz

I S (max) 450nA V S 2.4V to 5.5V

Temp Range -40°C to 125°C ESD (HBM) 3kV e n @ 1kHz 150nV/√Hz GBW 10kHz I S (max) 1.3µA V S 2.4V to 5.5V

Temp Range -40°C to 125°C ESD (HBM) 3kV 4

EL8170/EL8172: Instrumentation Amps

Performance • Supply Current/Amp : 60µA • Single Supply Operation: 2.4V to 5.5V

• Rail-to-Rail Input & Output • • CMRR : Typical 110dB • • Bipolar V I B OS < 1.5nA

PMOS V OS I B < 30pA

Applications

< 150µV, < 500µV,

High Gain (G > 100) Low Gain Applications (G > 10) Single Channel High Gain Applications (G > 100) Low Gain Applications (G > 10)

5V+ Heat bead FB+ FB IN+ IN EL8170 EL8170 In st ru m en t at io n Am p Sin g le Su p p ly Rail-Rail In p u t an d Ou t p u t Low Pow er: 95 m A max Hig h CM RR: 114 d B R f R

Channel

g

Single

V OUT

Dual Channel ISL28273 ISL28271

0Vto 2.5V

V OUT R f R g VIN

Quad Channel Bipolar ISL28470 MOS ISL28274 Bipolar Input MOS Input

Supply Voltage (V) Rail-To-Rail

Input

Shutdown Min Gain (V/V) Vos Max @ 25°C

TCVos Typ

Ib Max @ 25°C CMRR min @ 25°C PSRR min @ 25°C

Gain Error Type

Is Max @ 25°C -3dB BW Slew Rate (0.5 Hz to 100Hz Bandwidth) e N = 0.04

m Vrms See Application Note 1298 Part Number Single Dual Quad Min Max In Out mV µV/°C nA dB dB % µA kHz V/µs EL8170* ISL28270 ISL28470 2.4

5 Yes Yes Y 100 0.15

0.7

2 90 90 0.5

78 240 0.5

EL8172* ISL28272 2.4

5 Yes Yes Y 100 0.5

0.7

0.03

80 80 0.19

78 100 0.5

Noise 0.1 to 10Hz µVpp Voltage Noise @ 1kHz nV/√Hz Current Noise @ 1kHz fA/√Hz Temp Range Package Price @ 1kpcs °C SOIC QSOP Single Dual Quad 3.5

6 60 370

V OUT

78 200 -40 to 125 -40 to 125 S D/Q $1.20 $1.84 $2.33 S D 1.14

$1.84 5

Toxic Gas Handheld – Power Sections

Power : Focus on low Iq and high efficiency parts ISL9021: Wide Vin low Iq single LDO ISL9103/4: 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 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.

6 ADC

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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 @ V OUT = 1.5V) Output voltage as low as 0.9V

Very small packages

BATT Typical Application and Why Low V IN PSRR is Needed & High 3.7V

ISL9103/4 VIN VOUT 1.8V

VIN ISL9021 VOUT 1.2V

+ C 1 VCC FB V 2MHZ V 1.6x1.6 µTDFN 4-Ball WLCSP

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.

ISL28006/ISL28005: Micro-Power, Precision Low/High Side Current Sense Amplifier

• Ability to operate rail-rail for both low-side and high-side sensing • Excellent for low ohmic measurements Part Number Supply Voltage (V) Input Common Mode Range (V) Vos Max @ 25°C

Vos Max Temp CMRR min Temp PSRR min Temp Gain Range Gain Accuracy @ 25°C Gain Accuracy Temp

Is Max @ 25°C

Is Max Temp

GBW Temp Range Package Price @ 1kpcs Min Max Min Max µV µV dB dB V/V (%) (%) µA µA kHz °C ISL28005 2.7

28 0 28 500 500 105 90 20, 50, 100 20, 50, 100, Adj (20-100) 2 3 59 59 180 -40 to 125 SOT23 $0.75 ISL28006 2.7

28 0 28 250 300 105 90 0.7

1 62 62 180 -40 to 125 SOT23 $0.99 Precision (ISL28006) and Low Cost (ISL28005 Options V SS: 2.7V to 28V Vss Vout  Vsense *G (where G is the gain) Vout R S + ISL28006 FB V IN (V CM ): -50mV to 28V R S Ground + Vsense 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 R2 R1 ADJ.

Option Only 8

Barcode Scanner – Part 1

5 Q: Do you signal condition the output from the receiving detector with an op amp?

Solution: ISL28x13/ISL28x14 Low Cost, Low Power, GP Op Amp 6 Q: Are you concerned about the noise performance of your power supply? Solution: ISL80101A 1A LDO with programmable current limit 4 Q: How do you drive your motor?

Solution: HIP4020 Low voltage Full bridge driver with 0.5A integrated FET.

3 Q: How much current do you need from your switching regulator?

Solution: ISL8012 Low Iq , 2A switching regulator 2 Q: How do you monitor power or sense current?

Solution: ISL28005/6 Low Power, Integrated Current sense amplifier 9 ISL28x33/ISL28x30 Low Power, Precision Amplifier 7 Q: Do you need a low power SAR converter?

Solution: ISL267450 1 Msps SAR converters @ 3mW power consumptin 1 Q: What kind of charging circuit is needed for your device?

ISL2800X Design Example: 20A Max Current; 10V F

S

Output; G = 100

• •

Given these:

• • • Full scale sense current (I SENSE F S ) = 20A Full scale output voltage (V OUT F S ) = 10V Current sense amplifier gain (G = 100)

All that is needed is R

SENSE •

to complete the design:

Calculate full scale input voltage (V SENSE FS) = V OUT F S / Gain = 10V/100 = 0.1V

• Calculate R SENSE = V SENSE F S / I SENSE F S = 0.1V/ 20A = 5mΩ V S I SENSE FS = 20A + V RS+ 2V to 28V R Load SENSE = 5mΩ V SENSE FS = 0.1V

ISL28005 ISL28006 TYPE WSL2512 1W I-sense resistor with PCB copper Kelvin Contacts V OUT 0V to +10V FS 10

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Barcode Scanner – Part 2

7 Q: Are you using an external voltage reference for the converter?

Solution: ISL21080 Low Cost, Low Power, GP Voltage Reference 8 Q: Does your device get power from a USB port?

Solution: 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 9 Q: Do you monitor/supervise your power rail(s)?

Solution: ISL88016 voltage supervisor with pin selectable voltage trip points ISL9201: High integration single cell charger with power presence and EOC indicator ISL6295: low voltage fuel gauge

ISL80121: High Performance 1A LDO with Adjustable Current Limit

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Description

• High Performance 2.2V to 6V V IN , 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

ISL80121: Design to Protect Your Load

Feature Adjustable Current Limit Soft Start Fast Transient Benefit • Allows the user to set the current limit to keep the maximum output current below a desirable level for each individual application • Limits the inrush current during start-up • Limits voltage overshoot and leads to excellent AC accuracy These features are ideal for USB powered applications such as portable patient monitoring devices, DPF, monitors, etc. USB Hubs/ports, printers, modems, STBs, PCs, zip drives, external HDs, speakers, VOIP phones, They can also be used for other types of ports that require current limiting.

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Mobile Smart Device – Part 1

4 Q: Are you concerned about the noise performance of your power supply? Solution: ISL80102 2 A LDO with adjustable soft start 3 2 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.

Q: Do you monitor/supervise your power rail(s)? Solution: ISL88011 Dual voltage monitoring with adjustable power on reset.

1 14 Q: What kind of charging circuit is needed for your device?

Solution: ISL9230 High power Li-Ion Battery charger with iPath management

ISL9230: Charger IC with iPath Description

• 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 V IN 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.

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ISL9230: iPath Management

• •

How does it work?

At given current limit, control core continuously monitors the output voltage. Actions are based on three conditions:

– – V OUT holds steady, meaning available current is adequate • Deliver needed current to both paths V OUT starts to drop, meaning available current is not adequate – • Reduce ICHG until V OUT stops dropping V OUT continues to drop to below V level, meaning available current is far below demand BAT • The battery starts providing current to the load instead of charging.

Input AC IREF IMIN TIME Q1 Q2 GND

I LIM I SYS I CHG A

VOUT VBAT To Sys

I R I T B 100 O C I SEN Time

C

Temperature

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Mobile Smart Device – Part 2

5 Q: Do you control the backlight based on ambient light and proximity to save power?

Solution: ISL29028A Low-power Ambient Light and Proximity Sensor with intelligent interrupt and sleep modes Solution: ISL29023 Low-power digital Ambient Light Sensor with Interrupt Function for light sensor-only requirements 6 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 7 Q: Do you use voltage references?

Solution: ISL21080 or ISL21010 Low Cost, Low Power, GP Voltage Reference Offers the most variety Vout options in the industry

ISL8022: 2A/1.7A Dual Synchronous Buck Regulator

• •

Description

• 2A/1.7A Dual Output, Synchronous Buck Regulator with selectable PFM/PWM mode operation

Features

• V IN Range: 2.7V to 6V • • V OUT 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 18

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 I 2 C (SMBus compatible) output Small package - 2.0x2.1x0.7

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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

E-Power Meter

1 Q: How do you monitor power or sense current?

Solution: ISL28005/6 Low Power, Integrated Current sense amplifier ISL28133/ISL28130 Low Power, Precision Amplifier 2 Q: Are you using an external voltage reference for the µP?

Solution: ISL21080 or ISL21010 Low Cost, Low Power, GP Voltage Reference 3 Q: Are you concerned about the noise performance of your power supply?

Solution: ISL9007 400mA High PSSR LDO with short circuit protection 5 Q: Do you control the backlight based on ambient light and proximity to save power?

Solution: ISL29028A Low-power Ambient Light and Proximity Sensor with intelligent interrupt and sleep modes ISL29023 Low-power digital Ambient Light Sensor with Interrupt Function for light sensor-only requirements 21 4 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

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 Package Note: Pin-to-Pin Compatible with LTC3407-2 22

ISL9110/2: 1A Synchronous Buck-Boost Regulator

Features • 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 2.2uH

Vin=1.8V-5.5V

Cin 10uF PVIN LX1 VIN EN LX2

ISL9112

VOUT SDA SCLK /BAT FB GND PGND VDD

Vout=3.3V/1A

Cout 10uF R3 100K R1 100K R2 32.4K

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