General Description

The MAX40204 is a high-precision, bidirectional, high-side

current-sense amplifier (CSA) with a wide input commonmode

range from -0.1V (ground sensing) to 36V.

The device's ultra-low 2μV input offset voltage allows the

use of small sense resistor to reduce power dissipation

and a very low, 0.05% gain error ensures measurement

accuracy.

The MAX40204 offers two gain options using a logic-level

input (GAIN) that provides the flexibility to change the gain

on the fly. On-the-fly gain adjustment capability allows

the system to enhance accuracy when measuring current

much smaller than set full-scale level. See Table 1 for gain

configurations. Additionally, the MAX40204 supports unidirectional

and bidirectional current sensing with an external

voltage applied to a reference input, REF.

The MAX40204 operates with single-supply in the range

of 1.7V to 5.5V while consuming only 21μA. Low operating

supply current and 70nA (typ) shutdown current help extend

battery life and make the MAX40204 ideal for

portable and battery-operated devices.

The MAX40204 is available in a small 8-bump, 0.35mmpitch

WLP (1.468mm x 0.848mm) and 8-pin TDFN (2mm x

2mm) packages and is specified over the -40°C to +125°C

extended operating temperature range.

Applications

● Current Sensing in Power Management Systems

● Portable and Battery-Operated Systems

● Medical Instruments

● Base Station

● Smart Phones and Tablets

● Notebook Computers

Benefits and Features

● -0.1V to 36V Wide Input Common Mode

● Ultra-Low, 2μV Input Offset Voltage

● On-the-Fly Gain Setting Input

● Bidirectional/Unidirectional Current Sensing

● 20nA (max) Input Bias Current

● Extremely Low, 50nV/°C Input Offset Tempco

● 0.05% Gain Error

● 21μA Supply Current

● 70nA (typ) Shutdown Current

● 1.7V to 5.5V Single Supply Operating Range

● Space-Saving 8-Bump WLP and 8-Pin TDFN

Packages