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MAX9928FABT+TMAXIMN/a2500avai-0.1V to +28V Input Range, Micropower, Uni-/Bidirectional, Current-Sense Amplifiers
MAX9928FAUA+N/AN/a2500avai-0.1V to +28V Input Range, Micropower, Uni-/Bidirectional, Current-Sense Amplifiers


MAX9928FABT+T ,-0.1V to +28V Input Range, Micropower, Uni-/Bidirectional, Current-Sense AmplifiersELECTRICAL CHARACTERISTICST = +25°C ±0.1 ±0.4 AV = 3.6VRS+T = -40°C to +125°C ±0.8AInput Offset Vol ..
MAX9928FAUA+ ,-0.1V to +28V Input Range, Micropower, Uni-/Bidirectional, Current-Sense AmplifiersApplicationsA digital SIGN output indicates direction of current flow, so ● Monitoring Charge/Disch ..
MAX9929FAUA , -0.1V to 28V Input Range, Micropower, Uni-/Bidirectional, Current-Sense Amplifiers
MAX992ESA ,High-Speed, Micropower, Low-Voltage, SOT23, Rail-to-Rail I/O ComparatorsGeneral Description ________
MAX992ESA ,High-Speed, Micropower, Low-Voltage, SOT23, Rail-to-Rail I/O ComparatorsELECTRICAL CHARACTERISTICS (Note 1)(V = +2.7V to +5.5V, V = 0V, V = 0V, T = -40°C to +85°C, unless ..
MAX992ESA ,High-Speed, Micropower, Low-Voltage, SOT23, Rail-to-Rail I/O ComparatorsFeaturesThe MAX987/MAX988/MAX991/MAX992/MAX995/' 120ns Propagation DelayMAX996 single/dual/quad mic ..
MB89636R ,8-bit Proprietary MicrocontrollerFUJITSU SEMICONDUCTORDS07-12531-2EDATA SHEET8-bit Proprietary MicrocontrollerCMOS2F MC-8L MB89630R ..
MB89636R ,8-bit Proprietary MicrocontrollerFUJITSU SEMICONDUCTORDS07-12531-2EDATA SHEET8-bit Proprietary MicrocontrollerCMOS2F MC-8L MB89630R ..
MB89637 ,8-bit Proprietary MicrocontrollerFUJITSU SEMICONDUCTORDS07-12515-2EDATA SHEET8-bit Proprietary MicrocontrollerCMOS2F MC-8L MB89630 S ..
MB89637R ,8-bit Proprietary MicrocontrollerFUJITSU SEMICONDUCTORDS07-12531-2EDATA SHEET8-bit Proprietary MicrocontrollerCMOS2F MC-8L MB89630R ..
MB89647 ,8-bit Proprietary MicrocontrollerFUJITSU SEMICONDUCTORDS07-12505-3EDATA SHEET8-bit Proprietary MicrocontrollerCMOS2F MC-8L MB89640 S ..
MB89657AR ,8-bit Proprietary MicrocontrollerFEATURES 2•F MC-8L family CPU core • Dual-clock control system• Maximum memory space: 64 Kbytes • M ..


MAX9928FABT+T-MAX9928FAUA+
-0.1V to +28V Input Range, Micropower, Uni-/Bidirectional, Current-Sense Amplifiers
General Description
The MAX9928/MAX9929 low-cost, uni-/bidirectional,
high-side, current-sense amplifiers are ideal for monitor-
ing battery charge and discharge currents in notebooks,
cell phones, and other portable equipment. These devices
feature a wide -0.1V to +28V input common-mode voltage range, low 20μA supply current with VOS less than 0.4mV,
and a gain accuracy better than 1.0%. The input common-
mode range is independent of the supply voltage, ensur-
ing that the current-sense information remains accurate
even when the measurement rail is shorted to ground.
The MAX9928F features a current output with a transcon-ductance ratio of 5μA/mV. An external resistor converts
the output current to a voltage, allowing adjustable gain
so that the input sense voltage can be matched to the maximum ADC input swing. The MAX9929F has a volt-age output and integrates a 10kΩ output resistor for a fixed voltage gain of 50V/V.
A digital SIGN output indicates direction of current flow, so the user can utilize the full ADC input range for measuring
both charging and discharging currents.
The MAX9928/MAX9929 are fully specified over the -40°C to +125°C automotive temperature range, and available in 6-bump UCSP™ (1mm x 1.5mm) and 8-pin μMAX® packages. The UCSP package is bump-to-bump
compatible with the MAX4372_EBT.
Features
●Wide -0.1V to +28V Common-Mode Range,
Independent of Supply Voltage●2.5V to 5.5V Operating Supply Voltage●20μA Quiescent Supply Current●0.4mV (max) Input Offset Voltage●Gain Accuracy Better than 1% (max)●SIGN Output Indicates Current Polarity●Transconductance and Gain Versions Available • 5μA/mV (MAX9928F) • 50V/V (MAX9929F)●Pin Compatible with the MAX4372 in UCSP●Available in Ultra-Small, 3x2 UCSP (1mm x 1.5mm) and 8-Pin μMAX Packages
Applications
●Monitoring Charge/Discharge Currents in Portable/Battery-Powered Systems●Notebook Computers●General-System/Board-Level Current Monitoring●Smart-Battery Packs/Chargers●Precision Current Sources●Smart Cell Phones●Super Capacitor Charge/Discharge
Pin Configurations and Typical Operating Circuit appear at
end of data sheet.
UCSP is a trademark and μMAX is a registered trademark of Maxim Integrated Products, Inc.
Note: All devices are specified over the -40°C to +125°C operating temperature range.

+Denotes a lead(Pb)-free/RoHS-compliant package. T = Tape and reel.
PARTOUTPUT TYPEGAINPIN-PACKAGETOP MARK
MAX9928FAUA+
CurrentGm = 5μA/mV8 μMAX—
MAX9928FABT+T CurrentGm = 5μA/mV3x2 UCSP+AAF
MAX9929FAUA+
VoltageAV = 50V/V8 μMAX—
MAX9929FABT+T VoltageAV = 50V/V3x2 UCSP+ADI
MAX9928/MAX9929-0.1V to +28V Input Range, Micropower,
Uni-/Bidirectional, Current-Sense Amplifiers
Ordering Information
EVALUATION KIT AVAILABLE
VCC, SIGN to GND .................................................-0.3V to +6VRS+, RS- to GND ..................................................-0.3V to +30VOUT to GND .............................................-0.3V to (VCC + 0.3V)Differential Input Voltage (VRS+ - VRS-) ..............................±30VOUT, SIGN Short Circuit to VCC or GND ..................ContinuousCurrent into Any Pin .........................................................±20mAContinuous Power Dissipation (TA = +70°C) 6-Bump 1mm x 1.5mm UCSP (derate 3.9mW/°C above +70°C) ..........................308.3mW 8-Pin μMAX (derate 4.8mW/°C above +70°C) ............388mW
Operating Temperature Range .........................-40°C to +125°CStorage Temperature Range ............................-65°C to +150°C
Junction Temperature ......................................................+150°CLead Temperature (soldering, 10s) .................................+300°CSoldering Temperature (reflow) .......................................+260°C
(VRS+ = -0.1V to +28V, VCC = 3.3V, VSENSE = (VRS+ - VRS-) = 0V, ROUT = 10kΩ for MAX9928F, TA = -40°C to +125°C, unless oth-
erwise noted. Typical values are at TA = +25°C.) (Note 1)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
AMPLIFIER DC ELECTRICAL CHARACTERISTICS

Input Offset Voltage (Note 2)VOS
VRS+ = 3.6VTA = +25°C±0.1±0.4 TA = -40°C to +125°C±0.8
VRS+ = -0.1V
TA = +25°C±0.6±1.0
TA = -40°C to +125°C±3.0
Common-Mode Input RangeVCMR(Note 3)-0.1+28V
Common-Mode Rejection RatioCMRR
2V ≤ VRS+ ≤ 28VTA = +25°C93104TA = -40°C to +125°C87
-0.1V ≤ VRS+ ≤
+2V
TA = +25°C6072
TA = -40°C to +125°C54
Full-Scale Sense Voltage (Note 2)VSENSEMAX992_F±50mV
Gain (Note 2)AVMAX9929F50V/V
Gain Accuracy (Notes 2, 6)
MAX9929F,
VRS+ = 3.6V
TA = +25°C±0.3±1.0
TA = -40°C to +125°C±2.5
MAX9929F,
VRS+ = -0.1V
TA = +25°C±0.3±1.0
TA = -40°C to +125°C±2.8
Transconductance (Note 2)GMMAX9928F5µA/mV
Transconductance Accuracy (Note 2)
MAX9928F,
VRS+ = 3.6V
TA = +25°C±0.3±1.0TA = -40°C to +125°C±2.5
MAX9928F,
VRS+ = -0.1V
TA = +25°C±0.3±1.0
TA = -40°C to +125°C±2.8
Input Bias Current (Note 4)IRS+, IRS-2V ≤ VRS+ ≤ 28V01.66µA-0.1V ≤ VRS+ ≤ +2V-80+6
Input Offset Bias Current (Note 4)IOS2V ≤ VRS+ ≤ 28V±0.05±1µA-0.1V ≤ VRS+ ≤ +2V±0.2±2
Input Leakage CurrentIRS+, IRS-VCC = 0V, VRS+ = VRS- = 28V (Note 5)0.051.0µA
MAX9928/MAX9929-0.1V to +28V Input Range, Micropower, Uni-/Bidirectional, Current-Sense Ampliiers
Absolute Maximum Ratings

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect
device reliability.
Electrical Characteristics
(VRS+ = -0.1V to +28V, VCC = 3.3V, VSENSE = (VRS+ - VRS-) = 0V, ROUT = 10kΩ for MAX9928F, TA = -40°C to +125°C, unless oth-
erwise noted. Typical values are at TA = +25°C.) (Note 1)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS

Output ResistanceROUT
MAX9928F5MΩ
MAX9929F6.41013.6kΩOutput High Voltage (Note 6)VOHMAX9928F, ROUT = 10kΩ(VCC - 0.1)(VCC - 0.45)V
MAX9929F(VCC - 0.1)(VCC - 0.45)
Minimum Output Voltage (Note 7)VOLMAX9929FTA = +25°C0.252.0mV
TA = -40°C to +125°C15
Minimum Output Current (Note 7)IOLMAX9928FTA = +25°C0.0250.2µA
TA = -40°C to +125°C1.5
SIGN COMPARATOR DC ELECTRICAL CHARACTERISTICS

Discharge to Charge Trip Point (Note 8)VTDC
VRS+ = 3.6V
TA = +25°C-1.6-1.2-0.5
TA = -40°C to +125°C-2.15-0.15
VRS+ = -0.1V
TA = +25°C-2.5-1.2+0.25
TA = -40°C to +125°C-4.6+2.3
Charge to Discharge Trip Point (Note 8)VTCDVRS+ = 3.6VTA = +25°C-1.8mV
VRS+ = -0.1VTA = +25°C-1.8
Hysteresis Width VHYSVRS+ = 3.6V, -0.1VTA = +25°C0.6mV
Common-Mode Input Range (Note 9)VCMR-0.1+28V
Common-Mode Rejection Ratio (Note 9)CMRR2V ≤ VRS+ ≤ 28V102dB-0.1V ≤ VRS+ ≤ +2V74
Output Low VoltageVOLISINK = 100µA0.030.1V
Output High VoltageVOH(VCC - 0.01)(VCC - 0.04)V
Internal Pullup Resistor RPULL-UP1MΩ
POWER SUPPLY

Supply Voltage Range (Note 10)VCC
TA = +25°C2.55.5TA = -40°C to +125°C2.85.5
Ampliier Power-Supply Rejection Ratio (Note 10)PSRRAVRS+ = 3.6V7290dB
VRS+ = -0.1V6686
Comparator Power-Supply Rejection RatioPSRRCVRS+ = 3.6V90dB
VRS+ = -0.1V86
Quiescent Supply Current ICC2V ≤ VRS+ ≤ 28V2030-0.1V ≤ VRS+ < +2V115200
MAX9928/MAX9929-0.1V to +28V Input Range, Micropower, Uni-/Bidirectional, Current-Sense Ampliiers
Electrical Characteristics (continued)
(VRS+ = -0.1V to +28V, VCC = 3.3V, VSENSE = (VRS+ - VRS-) = 0V, ROUT = 10kΩ for MAX9928F, TA = -40°C to +125°C, unless oth-
erwise noted. Typical values are at TA = +25°C.) (Note 1)
Note 1:
All devices are 100% production tested at TA = +25°C. All temperature limits are guaranteed by design.
Note 2:
VOS is extrapolated from two point transconductance and gain accuracy tests. Measurements are made at VSENSE = +5mV
and VSENSE = +50mV for MAX992_F. These measurements are also used to test the full-scale sense voltage, transcon-
ductance, and gain. These VOS specifications are for the trimmed direction only (VRS+ > VRS-). For current flowing in the opposite direction (VRS- > VRS+), VOS is ±1mV (max) at +25°C and ±1.8mV (max) over temperature, when VRS+ is at 3.6V.
See the Detailed Description for more information.
Note 3:
Guaranteed by common-mode rejection ratio. Extrapolated VOS as described in Note 2 is used to calculate common-mode
rejection ratio.
Note 4:
Includes input bias current of SIGN comparator.
Note 5:
Leakage in to RS+ or RS- when VCC = 0V. Includes input leakage current of SIGN comparator. This specification does not
add to the bias current.
Note 6:
Output voltage should be 650mV below VCC to achieve full accuracy.
Note 7:
IOL is the minimum output current in the VSENSE - IOUT transfer characteristics. VOL is the minimum output voltage in the
VSENSE - VOUT transfer characteristic.
Note 8:
VSENSE voltage required to switch comparator.
Note 9:
Discharge to charge trip point is functionally tested at VCM = -0.1V, +3.6V, and +28V.
Note 10:
Guaranteed by PSRR test. Extrapolated VOS as described in Note 2 is used to calculate the power-supply rejection ratio.
VSENSE has to be such that the output voltage is 650mV below VCC to achieve full accuracy.
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
AC ELECTRICAL CHARACTERISTICS

-3dB BandwidthBWMAX992_F, VSENSE = 50mV150kHz
OUT Settling to 1% of Final ValuetSET
VRS+ = 3.6V, CLOAD = 10pF, ROUT = 10kΩ for
MAX9928F
MAX992_F, VSENSE =
5mV to 50mV step6MAX992_F, VSENSE =
50mV to 5mV step15
SIGN Comparator Propagation Delay (Low to High)tPROP_LH
Overdrive = 1mV80Overdrive = 5mV30
SIGN Comparator Propagation Delay (High to Low)tPROP_HL
Overdrive = 1mV50
Overdrive = 5mV13
Power-Up Time to 1% of Final
Value
VSENSE = 50mV for MAX992_F,
VRS+ = 3.6V, CLOAD = 10pF50µs
Saturation Recovery Time100mV ≤ VSENSE P 50mV for MAX992_F,
VRS+ = 3.6V, CLOAD = 10pF4ms
MAX9928/MAX9929-0.1V to +28V Input Range, Micropower, Uni-/Bidirectional, Current-Sense Ampliiers
Electrical Characteristics (continued)
(VCC = 3.3V, VRS+ = 12V, TA = +25°C, unless otherwise noted.)
GAIN ACCURACY
HISTOGRAM

MAX9928 toc02
GAIN ACCURACY (%)
FREQUENCY (%)
AV = 50V/V
OFFSET VOLTAGE
vs. COMMON-MODE VOLTAGE

MAX9928 toc03
COMMON-MODE VOLTAGE (V)
OFFSET VOLTAGE (mV)201
OFFSET VOLTAGE vs. TEMPERATURE
MAX9928 toc04
TEMPERATURE (°C)
OFFSET VOLTAGE (mV)
VCM = 3.6V
SUPPLY CURRENT
vs. SUPPLY VOLTAGE

MAX9928 toc05
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (µA)
VRS+ = 0V
VSENSE = 0V
VRS+ = 3.6V
SUPPLY CURRENT
vs. COMMON-MODE VOLTAGE

MAX9928 toc06
COMMON-MODE VOLTAGE (V)
SUPPLY CURRENT (µA)
VCC = 5.5V
VCC = 2.5V
SUPPLY CURRENT
vs. TEMPERATURE

MAX9928 toc07
SUPPLY CURRENT (µA)50250-25
VRS+ = 0V
VSENSE = 0V
VRS+ = 3.6V
INPUT BIAS CURRENT
vs. COMMON-MODE VOLTAGE
MAX9928 toc08
INPUT BIAS CURRENT (µA)
VOS HISTOGRAM
MAX9928 toc01
FREQUENCY (%)
AV = 50V/V
VOS (mV)
MAX9928/MAX9929-0.1V to +28V Input Range, Micropower, Uni-/Bidirectional, Current-Sense Ampliiers
Typical Operating Characteristics
(VCC = 3.3V, VRS+ = 12V, TA = +25°C, unless otherwise noted.)
MAX9929F
VOUT vs. VSENSE

MAX9928 toc10
VSENSE (mV)
OUT
(V)
VCC = 5.5V
VCC = 3.3V
VCC = 2.7V
VCC = 2.5V
MAX9929F
VOUT vs. VSENSE

MAX9928 toc11
VSENSE (mV)
OUT
(V)70605040
TA = -40°C
TA = +125°C
TA = +25°C
GAIN ACCURACY
vs. SUPPLY VOLTAGE

MAX9928 toc12
SUPPLY VOLTAGE (V)
GAIN ACCURANCY (%)
MINIMUM OUTPUT VOLTAGE
vs. TEMPERATURE
MAX9928 toc13
TEMPERATURE (°C)
MINIMUM OUTPUT VOLTAGE (mV)
GAIN ACCURACY vs. TEMPERATURE
MAX9928 toc14
TEMPERATURE (°C)
GAIN ACCURACY (%)
MAX9928F
IOUT vs. VSENSE
MAX9928 toc09
VSENSE (V)
IOUT
(µA)
TA = -40°C
TA = +125°C
VOUT = 0V
TA = +25°C
SMALL-SIGNAL GAIN
vs. FREQUENCY

MAX9928 toc15
GAIN (dB)
VCM = 3.6V
MAX992_F
CMRR vs. FREQUENCY

MAX9928 toc16
CMRR (dB)
100k10k1k100
1201M
MAX9928/MAX9929-0.1V to +28V Input Range, Micropower, Uni-/Bidirectional, Current-Sense Ampliiers
Typical Operating Characteristics (continued)
(VCC = 3.3V, VRS+ = 12V, TA = +25°C, unless otherwise noted.)
COMPARATOR PROPAGATION DELAY
(RS+ = 3.6V, 5mV OVERDRIVE)

MAX9928 toc21
VSENSE
2mV/div
VOUT
1V/div
VSIGN AND VOUT
vs. VSENSE

MAX9928 toc19
VSENSE (mV)
OUT
(mV)
SIGN
(V)1-2-10
PSRR vs. FREQUENCY
MAX9928 toc17
FREQUENCY (Hz)
PSRR (dB)
10k1k100101
0.1100k
POWER-UP DELAY

MAX9928 toc22
VCC
1V/div
VOUT
1V/div
OVERDRIVE RECOVERY

MAX9928 toc20
400µs/div
VSENSE
100mV/div
VOUT
500mV/div
MAX9929F LARGE-SIGNAL
TRANSIENT RESPONSE

MAX9928 toc18
100µs/div
VOUT
VSENSE
1V/div
50mV/div
MAX9928/MAX9929-0.1V to +28V Input Range, Micropower, Uni-/Bidirectional, Current-Sense Ampliiers
Typical Operating Characteristics (continued)
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