36V, Pin-Programmable Gain, Bidirectional CSA

The MAX40204 is a high-precision, bidirectional, high-side current-sense amplifier (CSA) with a wide input common-mode 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, 0.35mm-pitch 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

* Base Station * Current Sensing in Power Management Systems * Medical Instruments * Notebook Computers * Portable and Battery-Operated Systems * Smart Phones and Tablets

* -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