CT3601

BMS battery management chip

CT3601

 

Product Introduction

CT3601 is a highly integrated and high-precision analog front-end chip for lithium battery monitoring and comprehensive safety protection, with low side NMOS charge and discharge tube drive control, suitable for various battery pack applications such as 10-17 series ternary lithium or lithium iron phosphate.

CT3601 can independently complete periodic automatic scanning and measurement of each battery cell voltage, each external temperature, charging and discharging current, and the total voltage of the battery pack. According to the configured protection threshold and delay time, it can complete corresponding protection functions and autonomous release, autonomous cell balancing, and autonomous detection and protection of cell voltage collection and disconnection.

CT3601 can also be integrated with external microcontrollers MCU for application. In addition to the functions provided by the hardware itself, it can also have zero voltage forbidden charging and discharging protection and charging cut-off function. At the same time, MCU can also participate in the release of security events, control of charging tubes, and management of coulombs.

Supports 4 working modes: Full Power mode, Normal Sleep mode, Deep Sleep mode, and Shut Down mode. After power on, the chip is in Shut Down mode, waiting for the charger to be inserted or the WKUP/SHUT pin to be activated with a high level input.

Supports two balancing modes: hardware self balancing and software balancing.


Product Features

·27 scanning channels

·Can be used alone or in conjunction with MCU

·High precision measurement

·Integrated comprehensive hardware protection

·Flexible system scalability

·High reliability design

·Low power design


application field

·Widely applicable to different types of lithium batteries such as lithium manganese oxide and lithium iron phosphate;

·Cleaning appliances, garden tools, two wheeled electric vehicles, small and medium-sized energy storage, etc.


Technical configuration and performance 

Product Name

BMS battery management chip

Model

CT3601

Package size

7mm×7mm×1.4mm

Pin

LQFP48

Voltage

±5mV  @2V～4.25V

Electric current

±20μV@±5mV；±0.2%@±200mV

Cell temperature

±1℃@-40℃～85℃

Power waste

Full Power 模式: 130μA@25℃;

Normal Sleep 模式: 60μA@25℃;

Deep Sleep 模式: 10μA@25℃;

Shut Down 模式: 1μA@25℃;

Scannable channel

17 channel battery cell voltage;

Up to 6 external temperature channels can be configured;

Internal temperature of channel 1;

1-channel charging and discharging current;

2-channel high-voltage module voltage

Protection mechanism

Overcharge protection (OV) and secondary overcharge protection (SOV);

Overradiation protection (UV);

Charging high temperature protection (OTC), charging low temperature protection (UTC);

High temperature discharge protection (OTD) and low temperature discharge protection (UTD);

High temperature protection for charging and discharging tubes (MOT) (optional);

Internal overheat protection (OHT) of the device;

Discharge overcurrent 1 and 2, as well as short-circuit protection (OCD1, OCD2, and SCD);

Overcurrent protection for charging 1 and 2 (OCC1 and OCC2);

Cell connection disconnection detection and protection (CO);

Support secondary protection PF output (driver fuse blown);

Reliability

① Built in LDO output voltage measurement and chip working voltage measurement provide system self-test; ② Built in LDO short-circuit current limiting, overcurrent protection, and over temperature protection; ③ Differential voltage withstand of battery cell acquisition pins ± 100V, supporting 100~10k filtering resistors

System Expansion

Built in battery cell acquisition line breakage detection function;

Integrated 3.3V/5V 20mA driver LDO power supply;

Integrated 3.3V/5V 40mA LDO driver power supply;

Built in load plugging and charger plugging detection function;

Supports 0V no charge/discharge and End of Charge (EOC) protection (optional);

Support low side charging tube voltage/discharging tube voltage drive;

Built in low side pre charge tube current/pre discharge tube voltage drive;

Supports up to 6 external temperature measurements (configurable);

ECTRL pins support PWM control of discharge tubes;

Support electronic locks;

400kHz I2C communication interface, CRC-8 verification;

Internal event interrupt output


Product Image

CT3601.jpg

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