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