深圳市中立信电子科技有限公司

AD8450ASTZ

电池管理 Precision Analog Front End and Controller  for Battery Test/Formation Systems

GENERAL DESCRIPTION AD8450ASTZ

The AD8450 is a precision analog front end and controller for  testing and monitoring battery cells. A precision programmable  gain instrumentation amplifier (PGIA) measures the battery  charge/discharge current, and a programmable gain difference  amplifier (PGDA) measures the battery voltage (see Figure 1).  Internal laser trimmed resistor networks set the gains for the  PGIA and the PGDA, optimizing the performance of the  AD8450 over the rated temperature range. PGIA gains are 26,  66, 133, and 200. PGDA gains are 0.2, 0.27, 0.4, and 0.8.

FEATURES AD8450ASTZ

Integrated constant current and voltage modes with

automatic switchover

Charge and discharge modes

Precision voltage and current measurement

Integrated precision control feedback blocks

Precision interface to PWM or linear power converters

Programmable gain settings

Current sense gains: 26, 66, 133, and 200

Voltage sense gains: 0.2, 0.27, 0.4, and 0.8

Programmable OVP and OCP fault detection

Current sharing and balancing

Excellent ac and dc performance

Maximum offset voltage drift: 0.6 μV/°C

Maximum gain drift: 3 ppm/°C

Low current sense amplifier input voltage noise: ≤9 nV/√Hz

Current sense CMRR: 126 dB minimum (gain = 200)

TTL compliant logic

APPLICATIONS AD8450ASTZ

Battery cell formation and testing

Battery module testing