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bq76920, bq76930, bq76940
SLUSBK2F –OCTOBER 2013–REVISED NOVEMBER 2015
bq769x0 3-Series to 15-Series Cell Battery Monitor Family
for Li-Ion and Phosphate Applications
1 Introduction
1
1.1 Features
– Undervoltage (UV)
• AFE Monitoring Features
– Secondary protector fault detection
– Pure digital interface
• Additional Features
– Internal ADC measures cell voltage, die
temperature, and external thermistor – Integrated cell balancing FETs
– A separate, internal ADC measures pack – Charge, discharge low-side NCH FET drivers
current (coulomb counter)
– Alert interrupt to host microcontroller
– Directly supports up to three thermistors
– 2.5-V or 3.3-V output voltage regulator
(103AT)
– No EEPROM programming necessary
• Hardware Protection Features
– High supply voltage abs max (up to 108 V)
– Overcurrent in discharge (OCD)
– Simple I
2
C™ compatible interface (CRC option)
– Short circuit in discharge (SCD)
– Random cell connection tolerant
– Overvoltage (OV)
1.2 Applications
• Light Electric Vehicles (LEV): eBikes, eScooters, • Battery Backup and UPS Systems
Pedelec, and Pedal-Assist Bicycles
• Wireless Base Station Backup Systems
• Power and Gardening Tools
• 12-V, 18-V, 24-V, 36-V, and 48-V Battery Packs
1.3 Description
The bq769x0 family of robust analog front-end (AFE) devices serves as part of a complete
pack monitoring and protection solution for next-generation, high-power systems, such as light electric
vehicles, power tools, and uninterruptible power supplies. The bq769x0 is designed with low power in
mind: Sub-blocks within the IC may be enabled/disabled to control the overall chip current consumption,
and a SHIP mode provides a simple way to put the pack into an ultra-low power state.
Device Information
(1)
PART NUMBER PACKAGE BODY SIZE (NOM)
bq76920 TSSOP (20) 6.50 mm × 4.40 mm
bq76930 TSSOP (30) 7.80 mm × 4.40 mm
bq76940 TSSOP (44) 11.00 mm × 4.40 mm
(1) For all available packages, see the orderable addendum at the end of the data sheet.
1.4 Simplified System Diagram
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. UNLESS OTHERWISE NOTED, this document contains
PRODUCTION DATA.
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