HANDHELD
SOLUTIONS
SIMPLY SMARTER™
Toxic Gas Handheld – The Analog Sections
Low Power, Precision Signal Chain
ISL28194/5
ISL88001/2/3
ISL28194/5
ISL28194/5
ISL12030
ISL26132
ICL3238E
ISL28194/5
EL8170/72
ISL28230
ISL6118 /19
Fuel Gauge: ISL6295
Li-Ion charger: ISL9205
Charging Safety: ISL9200, ISL9212
ISL21070/80
ISL60002
LDO: ISL80101/A and ISL9021
Buck Converters: ISL8009A and ISL9104
2
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.
ISL28194/5
ISL28194/5
− Reference electrode anchors the
working electrode potential.
ISL28194/5
− 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.
ISL28194/5
• Oxygen Sensor – Current output
EL8170/72
• Heat Bead – Bridge type voltage output
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
3
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
For Precision Alternatives, see ISL28233 or ISL28230
ISL28194
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
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
ISL28195
4
EL8170/EL8172: Instrumentation Amps
Performance
• Supply Current/Amp : 60µA
• Single Supply Operation: 2.4V to
5.5V
• Rail-to-Rail Input & Output
Part Number
Single
Channel
Dual
Single
Channel
Channel
• CMRR : Typical 110dB High Gain
ISL28470
ISL28270
EL8172
ISL28272
ISL28272
ISL28274
MOS
ISL28274
Input
EL8173
ISL28273
ISL28273
Bipolar
Input
EL8171
ISL28271
ISL28271
MOS
Input
ISL28270
EL8170
EL8173
Low
Gain
Applications Applications
(GEL8171
> 10)
(G > 10)
IN+
5V+
INFB+
Heat bead
EL8170 Inst rum en t at ion Am p
Single Sup p ly Rail-Rail Inp ut and Out p ut
Low Pow er: 95 mA max
High CM RR: 114 d B
5
VOUT
0Vto 2.5V
EL8170
FB-
Channel
Bipolar
ISL28470
Input
High
Gain
EL8170
Applications
Applications
• Low Offset Voltage & Bias
Current
(GEL8172
> 100)
(G
>
100)
• Bipolar VOS < 150µV,
IB < 1.5nA
• PMOS VOS < 500µV, Low Gain
IB < 30pA
Quad
Dual
Channel
Channel
Quad Supply Voltage (V)
Rf
Rg
V
OUT
= ( 1+
Rf
)
Rg
V IN
(0.5 Hz to 100Hz Bandwidth)
e = 0.04 mVrms
N
Rail-To-Rail
Bipolar
InputShutdown
Single
Dual
Quad
Min
Max
In
Out
Min Gain (V/V)
VosMOS
Max @ 25°C
mV
Input
TCVos Typ
µV/°C
IbBipolar
Max @ 25°C
nA
Input
CMRR min @ 25°C
dB
PSRRMOS
min @ 25°C
dB
Input
Gain
Error Type
Is Max @ 25°C
-3dB BW
Slew Rate
%
µA
kHz
V/µs
Noise 0.1 to 10Hz
µVpp
Voltage Noise @ 1kHz nV/√Hz
Current Noise @ 1kHz fA/√Hz
Temp Range
Package
See Application Note 1298
Price @ 1kpcs
EL8170*
ISL28270
ISL28470
2.4
5
Yes
Yes
Y
100
0.15
0.7
2
90
90
EL8172*
ISL28272
0.5
78
240
0.5
0.19
78
100
0.5
3.5
60
370
6
78
200
VOUT
2.4
5
Yes
Yes
Y
100
0.5
0.7
0.03
80
80
°C
-40 to 125 -40 to 125
SOIC
S
S
QSOP
D/Q
D
Single
$1.20
1.14
Dual
$1.84
$1.84
Quad
$2.33
Toxic Gas Handheld – Power Sections
ADC
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
ISL9021: Single Low VIN, High PSRR 250mA LDO
Typical Application and Why Low VIN & High
PSRR is Needed
• Description
– 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
VIN
+
BATT
C1
1.8V
VOUT
VIN
FB
V
ISL9021
2MHZ
1.2V
VOUT
VCC
PA OR
CPU CORE
– Wide input dynamic range of 1.5V –
5.5V efficiently operates from buck
output
ISL9103/4
BUCK
CONVERTER
• Features
3.7V
LOW PSRRHi PSRR
LDO
LDO
– Single low input voltage, high PSRR
LDO capable of delivering up 250mA
of continuous current
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.
7
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
ISL28005
2.7
28
0
28
500
500
105
90
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
20, 50, 100,
20, 50, 100 Adj (20-100)
(%)
2
0.7
(%)
µA
µA
kHz
3
59
59
180
1
62
62
180
°C
Typical Application:
Multiple Output
Power Supply
ISL28006
2.7
28
0
28
250
300
105
90
-40 to 125
SOT23
$0.75
-40 to 125
SOT23
$0.99
VIN(VCM):
-50mV to 28V
Precision (ISL28006) and
Low Cost (ISL28005 Options
VSS:
2.7V to 28V
+
Vss
RS+
ISL28006
Vout
FB
Load
R1
ADJ.
Option
Only
8
Ground
Vout  Vsense *G
(where G is the gain)
R2
Vsense
RS-
Barcode Scanner – Part 1
5
Q: Do you signal condition the output from
the receiving detector with an op amp?
6
Q: Are you concerned about the noise performance of your power supply?
Solution: ISL80101A
Solution:
ISL28x13/ISL28x14
1A LDO with programmable current limit
Low Cost, Low Power, GP Op Amp
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
7
Q: Do you need a low power
SAR converter?
Solution: ISL267450
2
1 Msps SAR converters
@ 3mW power consumptin
Q: How do you monitor power or sense current?
Solution:
ISL28005/6
Low Power, Integrated Current sense amplifier
ISL28x33/ISL28x30
Low Power, Precision Amplifier
9
1
Q: What kind of charging circuit is needed for your device?
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
ISENSEFS = 20A
+
-
VRS+
2V to 28V
10
VSENSE FS = 0.1V ISL28005
ISL28006
RSENSE = 5mΩ
Load
TYPE WSL2512
1W I-sense resistor
with PCB copper Kelvin Contacts
VOUT
0V to +10V FS
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:
11
low voltage fuel gauge
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
12
ISL80121: Design to Protect Your Load
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
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.
13
Mobile Smart Device – Part 1
4
Q: Are you concerned about the noise performance
of your power supply?
Solution: ISL80102
2A LDO with adjustable soft start
3
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.
2
Q: Do you monitor/supervise your
power rail(s)?
Solution: ISL88011
Dual voltage monitoring with
adjustable power on reset.
1
Q: What kind of charging circuit is
needed for your device?
Solution: ISL9230
High power Li-Ion Battery charger
with iPath management
14
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 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.
15
ISL9230: iPath Management
• How does it work?
• At given current limit, control
core continuously monitors the
output voltage. Actions are
based on three conditions:
Input
AC
IREF
VBAT
Q1
IMIN
Q2
TIME
GND
– 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.
16
To Sys
VOUT
IR
I LIM
I SYS
IT
I CHG
I
SEN
Time
A
B
C
100O C
Temperature
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
17
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
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
• I2C (SMBus compatible) output
• Small package - 2.0x2.1x0.7
19
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
20
E-Power Meter
1
Q: How do you monitor power or sense current?
Solution:
ISL28005/6
2
Q: Are you using an external voltage reference for the µP?
Solution: ISL21080 or ISL21010
Low Cost, Low Power, GP Voltage Reference
Low Power, Integrated Current
sense amplifier
ISL28133/ISL28130
Low Power, Precision Amplifier
3
Q: Are you concerned about the
noise performance of your
power supply?
Solution: ISL9007
5
400mA High PSSR LDO
with short circuit protection
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
2.2uH
• Pulse Frequency Modulation (PFM) for Light Load
• Over Current Protection and Thermal Shutdown
• Industrial Temperature Range
• Tiny Thermally Enhanced QFN Lead-Free Package
Vin=1.8V-5.5V
LX1
Vout=3.3V/1A
VOUT
VDD
SDA
Cin
10uF
VIN
SCLK
ISL9112
R3
100K
R1
100K
/BAT
EN
FB
GND
23
LX2
PVIN
PGND
R2
32.4K
Cout
10uF
Intersil
www.intersil.com