BQ77904 Datasheet, PDF (1/45 Pages) Texas Instruments – Open Wire Stackable Lithium-ion Battery Protector

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bq77904, bq77905
SLUSCM3A – JUNE 2016 – REVISED JUNE 2016
bq77905, bq77904 3-5S Ultra Low-Power Voltage, Current, Temperature,
and Open Wire Stackable Lithium-ion Battery Protector
1 Features
•1 Voltage Protection (Accuracy ±10 mV)
– Overvoltage: 3 V to 4.575 V
– Undervoltage: 1.2 V to 3 V
• Open Cell and Open Wire Detection (OW)
• Current Protection
– Overcurrent Discharge 1: –10 mV to –85 mV
– Overcurrent Discharge 2: –20 mV to 170 mV
– Short Circuit Discharge: –40 mV to 340 mV
– Accuracy ±20% for ≤ 20 mV, ±30% for > 20
mV across full temperature
• Temperature Protection
– Overtemperature Charge: 45°C or 50°C
– Overtemperature Discharge: 65°C or 70°C
– Undertemperature Charge: –5°C or 0°C
– Undertemperature Discharge: –20°C or –10°C
• Additional Features
– Independent Charge (CHG) and Discharge
(DSG) FET Drivers
– SimpleStack Interface for Easy Stacking
– 36-V Absolute Maximum Rating Per Cell Input
– Built-In-Self-Test Functions For High Reliability
• Normal Mode: 6 µA (bq77904/bq77905)
• Shutdown Mode: 0.5 µA Maximum
3 Description
The bq77904 and bq77905 devices are low-power
battery pack protectors that implement a suite of
voltage, current, and temperature protections without
microcontroller (MCU) control. Protection thresholds
and delays are factory-programmed and available in
a variety of configurations. Separate overtemperature
and undertemperature thresholds for discharge (OTD
and UTD) and charge (OTC and UTC) are provided
for added flexibility.
The device achieves pack protection via the
integrated independent CHG and DSG low-side
NMOS FET drivers, which may be disabled via two
control pins. These control pins may also be used to
achieve cell protection solutions for higher series (6S
and beyond) in a simple and economical manner. To
do this, simply cascade a higher device CHG and
DSG outputs to the immediate lower device control
pins. For reduced component count, all protection
faults use internal delay timers.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
bq77904
bq77905
TSSOP (20)
6.50 × 4.40 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Simplified Schematic
2 Applications
• Power Tools, Garden Tools
• Start-Stop Battery Packs
• Lead-Acid (PbA) Replacement Batteries
• Light Electric Vehicles
• Energy Storage Systems, Uninterruptible Power
Supplies (UPS)
• 10.8 V to 72 V Packs
VDD
VTB
VC5
TS
bq77094/5
LD
Vss
SRP SRN DSG CHGU
PACK+
CTRD CTRC
VDD
VTB
VC5
TS
bq77094/5
LD
Vss
SRP SRN DSG CHG
PACK-
Copyright © 2016, Texas Instruments Incorporated
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. PRODUCTION DATA.