1FEATURES
• 60-V Maximum Stack Operating Voltage
• Bidirectional Balancing Current
• Fully Synchronous Operation
• Active Clamp Signal
• 250-kHz Switching Frequency
• Fault Detection Includes Two Separate UVLO
Cells (One for Each External Supply), Primary
and Secondary Side Current Limit, OVP/UVP
Sense on Cell Being Charged, Thermal
Shutdown, and Watchdog Timer
• Balancing Current User-selectable Through
External Voltage
• EMB1499Q is an Automotive Grade Product
that is AEC-Q100 Grade 1 Qualified (–40°C to
+125°C Operating Junction Temperature)

APPLICATIONS
• Li-Ion Battery Management Systems
• Hybrid and Electric Vehicles
• Grid Storage

DESCRIPTION
The EMB1499Q bidirectional current dc/dc controller
IC works in conjunction with the EMB1428 switch matrix gate driver IC to support TI’s switch matrix
based active cell balancing scheme for a battery
management system. The EMB1499Q provides three
PWM MOSFET gate signals to a bidirectional forward converter so that its output current, either positive or
negative, is regulated around a user-defined
magnitude. This inductor current is channeled by the
EMB1428 through the switch matrix to the cell that
needs to be charged or discharged. In a typical
scheme, the EMB1499Q-based forward converter
exchanges energy between a single cell and the
battery stack to which it belongs, with a maximum stack voltage of up to 60 V. The switching frequency
is fixed at 250 kHz. The EMB1499Q senses cell
voltage, inductor current and stack current and
provides protection from abnormal conditions during
balancing.
The EMB1499Q also provides an active clamp timing
signal to control an external FET driver for the
primary-side active clamp FET. The EMB1499Q is enabled and disabled by the EMB1428. Fault
conditions detected by the EMB1499Q are
communicated to the EMB1428 through the DONE
and FAULT pins.