The MAX9928/MAX9929 low-cost, uni-/bidirectional, high-side, current-sense amplifiers are ideal for monitoring 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, ensuring that the current-sense information remains accurate even when the measurement rail is shorted to ground.
The MAX9928F/MAX9928T feature a current output with transconductance ratios of 5µA/mV and 2µA/mV, respectively. 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/MAX9929T have a voltage output and integrate a 10kΩ output resistor for fixed voltage gains of 50V/V and 20V/V, respectively.
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.
Key Features
Applications/Uses
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
Two IOUT Transconductance Versions Available
2µA/mV (MAX9928T)
5µA/mV (MAX9928F)
Two VOUT Gain Versions Available
20V/V (MAX9929T)
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
General-System/Board-Level Current Monitoring
Monitoring Charge/Discharge Currents in Portable/Battery-Powered Systems
Notes: **This pricing is BUDGETARY, for comparing similar parts. Prices are in
U.S. dollars and subject to change. Quantity pricing may vary
substantially and international prices may differ due to local
duties, taxes, fees, and exchange rates. For volume-specific prices
and delivery, please see the price and availability page
or contact an authorized distributor.
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