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MAX9938

1µA, 4-Bump UCSP/SOT23, Precision Current-Sense Amplifier

Industry's Smallest Current-Sense Amplifier: 1mm x 1mm with I_CC < 1µA, V_OS < 500µV, Gain Error < 0.5%

Overview

Technical Documents

Ordering Info

Status

Active: In Production.

Description

The MAX9938 high-side current-sense amplifier offers precision accuracy specifications of V_OS less than 500µV (max) and gain error less than 0.5% (max). Quiescent supply current is an ultra-low 1µA. The MAX9938 fits in a tiny, 1mm x 1mm UCSP™ package size or a 5-pin SOT23 package, making the part ideal for applications in notebook computers, cell phones, PDAs, and all battery-operated portable devices where accuracy, low quiescent current, and small size are critical.

The MAX9938 features an input common-mode voltage range from 1.6V to 28V. These current-sense amplifiers have a voltage output and are offered in four gain versions: 25V/V (MAX9938T), 50V/V (MAX9938F), 100V/V (MAX9938H), and 200V/V (MAX9938W).

The four gain selections offer flexibility in the choice of the external current-sense resistor. The very low 500µV (max) input offset voltage allows small 25mV to 50mV full-scale V_SENSE voltage for very low voltage drop at full-current measurement.

The MAX9938 is offered in tiny 4-bump, UCSP (1mm x 1mm x 0.6mm footprint), 5-pin SOT23, and 6-pin µDFN (2mm x 2mm x 0.8mm) packages specified for operation over the -40°C to +85°C extended temperature range.

Data Sheet

Download	Rev 6	(PDF, 524kB)
E-Mail

An evaluation kit is available: MAX9938EVKIT

Key Features

Ultra-Low Supply Current of 1µA (max)
Low 500µV (max) Input Offset Voltage
Low < 0.5% (max) Gain Error
Input Common Mode: +1.6V to +28V
Voltage Output
Four Gain Versions Available
- 25V/V (MAX9938T)
- 50V/V (MAX9938F)
- 100V/V (MAX9938H)
- 200V/V (MAX9938W)
Tiny 1mm x 1mm x 0.6mm, 4-Bump UCSP, 5-Pin SOT23, or 2mm x 2mm x 0.8mm, 6-Pin µDFN Packages

Applications/Uses

Cell Phones
Notebook Computers
PDAs
Portable/Battery-Powered Systems
Power Management Systems

Key Specifications:

Current Sense Amplifiers

Part Number

CMVR
(V)

V_CC
(V)

I_CC
(µA)

Bi-Dir. Curr. Sense

V_{SENSE_FS}
(mV)

V_OS @25°C
(µV)

Gain

Gain Accuracy @25°C
(%)

BW
(kHz)

Comp-
arators

Oper. Temp.
(°C)

Package/Pins

Budgetary Price

min

max

min

max

typ

recomm.

max

@ -3dB

See Notes

MAX9938

1.6

100

500

25 V/V

50 V/V

100 V/V

200 V/V

0.5

125

-40 to +85

See All Current Sense Amplifiers (36)

Pricing 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.

Diagram

Typical Operating Circuit

Application Notes

Application Note 4268		Ultra-Small UCSP™ Devices Improve Battery Management in Portable Applications
Application Note 4328		Low-Loss LED Driver Improves a System's Green Footprint by Boosting Efficiency and Extending Battery Life
Application Note 4837		Protect Current-Sense Amplifiers from Negative Overvoltage

Product Guides

Amplifiers and Comparators (PDF)

Reliability Reports

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Software/Models

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Ordering Information

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Temperature:

Tape and Reel

Sample

Part Number	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX9938FEBS+T			Active	UCSP;4 pin;1.1 mm² Outline Drawing:21-0117 (PDF) Land Pattern: Not Available Use pkgcode/variation: B4+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX9938FEBS+TG45			Active	UCSP;4 pin;1.1 mm² Outline Drawing:21-0117 (PDF) Land Pattern: Not Available Use pkgcode/variation: B4+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX9938FELT+			Active	µDFN;6 pin;4.2 mm² Outline Drawing:21-0164 (PDF) Land Pattern: 90-0004 (PDF) Use pkgcode/variation: L622+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX9938FELT+T			Active	µDFN;6 pin;4.2 mm² Outline Drawing:21-0164 (PDF) Land Pattern: 90-0004 (PDF) Use pkgcode/variation: L622+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX9938FEUK+			Active	SOT;5 pin;9 mm² Outline Drawing:21-0057 (PDF) Land Pattern: 90-0174 (PDF) Use pkgcode/variation: U5+2*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX9938FEUK+T			Active	SOT;5 pin;9 mm² Outline Drawing:21-0057 (PDF) Land Pattern: 90-0174 (PDF) Use pkgcode/variation: U5+2*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX9938HEBS+T			Active	UCSP;4 pin;1.1 mm² Outline Drawing:21-0117 (PDF) Land Pattern: Not Available Use pkgcode/variation: B4+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX9938HEBS+TG45			Active	UCSP;4 pin;1.1 mm² Outline Drawing:21-0117 (PDF) Land Pattern: Not Available Use pkgcode/variation: B4+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX9938HEUK+			Active	SOT;5 pin;9 mm² Outline Drawing:21-0057 (PDF) Land Pattern: 90-0174 (PDF) Use pkgcode/variation: U5+2*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX9938HEUK+T			Active	SOT;5 pin;9 mm² Outline Drawing:21-0057 (PDF) Land Pattern: 90-0174 (PDF) Use pkgcode/variation: U5+2*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
Part Number	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX9938TEBS+T			Active	UCSP;4 pin;1.1 mm² Outline Drawing:21-0117 (PDF) Land Pattern: Not Available Use pkgcode/variation: B4+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX9938TEBS+TG45			Active	UCSP;4 pin;1.1 mm² Outline Drawing:21-0117 (PDF) Land Pattern: Not Available Use pkgcode/variation: B4+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX9938TEUK+			Active	SOT;5 pin;9 mm² Outline Drawing:21-0057 (PDF) Land Pattern: 90-0174 (PDF) Use pkgcode/variation: U5+2*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX9938TEUK+T			Active	SOT;5 pin;9 mm² Outline Drawing:21-0057 (PDF) Land Pattern: 90-0174 (PDF) Use pkgcode/variation: U5+2*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX9938WEBS+T			Active	UCSP;4 pin;1.1 mm² Outline Drawing:21-0117 (PDF) Land Pattern: Not Available Use pkgcode/variation: B4+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX9938WEBS+TG45			Active	UCSP;4 pin;1.1 mm² Outline Drawing:21-0117 (PDF) Land Pattern: Not Available Use pkgcode/variation: B4+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX9938WEUK+			Active	SOT;5 pin;9 mm² Outline Drawing:21-0057 (PDF) Land Pattern: 90-0174 (PDF) Use pkgcode/variation: U5+2*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX9938WEUK+T			Active	SOT;5 pin;9 mm² Outline Drawing:21-0057 (PDF) Land Pattern: 90-0174 (PDF) Use pkgcode/variation: U5+2*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis

Notes:

Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.
Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day.
Part number suffixes: T or T&R = tape and reel; + = RoHS/lead-free; # = RoHS/lead-exempt; -D = drypack; -U/+U on DS parts = cut tape. More: See Full Data Sheet or Maxim Product Naming Conventions.
* Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.

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See All Current Sense Amplifiers (36 Products)

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Evaluation Kits

MAX9938EVKIT

Evaluation Kit for the MAX9938

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