The HT7Q1531 is a high voltage analog-front-end IC for 3 to 8 cell Li-ion rechargeable battery protection. It consists of an accumulative cell voltage monitor, a high accuracy voltage regulator, two discharge N-type MOSFET gate drivers and a charge N-type MOSFET gate driver. The device is designed to monitor an accumulative voltage from 1 to N and outputs the divide-by-N voltage to the analog multiplexer with a ±0.5% divided ratio accuracy. The device can directly drive external power N-type MOSFETs to control charge and discharge by charge and discharge gate drivers. The integrated battery balance circuitry provides a cell balance current without the need of external transistors. The anti-reverse current switch is implemented to prevent a backflow current even if VOUT is higher than VBATn. Each divided accumulative cell voltage can be observed sequentially from VBAT1 to VBAT8 which benefits MCUs with a lower number of ADCs. An integrated 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 and gate drivers are shut down with an ultra-low standby current of 0.1μA when the device is in the Sleep mode. When the HVWK pin is triggered by a voltage greater than its threshold, the device will return to the standby state.

Specification:

• cell #: 3~8
• input voltage: 7.5V~36V
• control I/F: I²C
• VMON voltage monitor type: accumulative
• VMON accuracy: 1/n±0.5% (ratio)
• charge balancer: 120Ω/CH
• gate driver: L/S×2CH, H/S×1CH
• LDO: 5V±1%
• HV wake up: 1CH
• case: 24QFN