The HT7Q2552 is a high voltage analog-front-end IC for 3 to 8 cell Li-ion rechargeable battery protection. It consists of a 5V high accuracy regulator, an accuracy 2.5V reference voltage output, an individual cell voltage monitor, two discharge paths, i.e., low-side power switch gate drivers, a charge path, i.e., high-side power switch gate driver, a charge/discharge differential current monitor, and a discharge short-current protection. The cell voltage monitor is designed to monitor each battery cell voltage individually and outputs the divide-by-2 voltage to the analog multiplexer with ±0.36% accuracy. The current monitor channel provide charge and discharge current monitoring and short-current protection. The device can directly drive external N-type MOSFETs to control charge and discharge by charge and discharge gate drivers. The internal battery balance circuitry provides a cell balance current without the need of external transistors. Each monitored battery cell voltage can be observed sequentially from VBAT1 to VBAT8 which benefits MCUs with a lower number of ADCs.

An integrated 5V regulator provides a 5V supply to the MCU with a 50mA driving current capability and which has ±1% accuracy. The voltage regulator, cell voltage monitor, current monitors, and gate drivers are shut down with an ultra-low standby current 0.1μA when the device is in the Sleep mode. When the HVWK1 or HVWK2 pin is triggered by a voltage greater than its threshold, the device will return to the normal operating status.

Features:

• VIN input range from 7.5V to 36V
•  Individual cell voltage monitor outputs 1/2 of battery cell voltage, when the analog output is 2.1V, it has an accuracy of ±7.5mV
•  Internal cell charging balance switches
•  Integrated voltage regulator with 5V/50mA and ±1% accuracy
•  At Ta=-40oC~85oC, 2.5V reference voltage output with a maximum variation of 15mV in temperature drift
•  Two Discharge N-type MOSFET gate drivers
•  Single Charge N-type MOSFET gate driver
•  Charge/Discharge differential current monitor:
  • IMON pin outputs amplified ISP0-ISN0 differential voltage
  • Voltage amplifying rate selection: 10/50
•  Discharge short-current detection:
  • Detection threshold voltage selection: 50mV/100mV/150mV/200mV/250mV/300mV/350mV/400mV
  • Detection debounce time selection: 0μs~992μs, 32 sections, 32μs per section
•  Integrated Over-temperature protection selection: 85℃/100℃/125℃/150℃
•  Sleep mode with 0.1μA ultra-low standby current
•  Two High-voltage wake-up functions
•  I²C bus communication with host MCU
•  Operating temperature range: -40℃ to +85℃
•  Package type: 32-pin QFN