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BQ7790522PWR

3- to 5-series li-ion and li-phosphate ultra-low-power stackable battery protector

Manufacturer:

Texas Instruments, Inc
Mfr.Part #:

BQ7790522PWR
Datasheet:

BQ7790522PWR Datasheet (PDF)
Function:

Battery Protection
Battery Chemistry:

Lithium Ion
Number of Cells:

3 ~ 5
Fault Protection:

Over Current, Over Temperature, Over/Under Voltage, Short Circuit
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BQ7790522PWR General 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. The devices stackable interface provides simple scaling to support battery cell applications from 3 series to 20 series or more. 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 through the integrated independent CHG and DSG low-side NMOS FET drivers, which may be disabled through two control pins. These control pins may also be used to achieve cell protection solutions for higher series (6 series 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 a reduced component count, all protection faults use internal delay timers.

Key Features

NORMAL mode: 6 µA (BQ77904 and BQ77905)
Full suite of voltage, current, and temperature protections
Scalable cell count from 3 series to 20 series or more
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
- 36-V absolute maximum rating per cell input
- Built-in-self-test functions for high reliability
SHUTDOWN mode: 0.5-µA maximum
Functional Safety-Capable
- Documentation available to aid functional safety system design

Specifications

Category	Integrated Circuits (ICs)Power Management (PMIC)Battery Management	Series	-
Function	Battery Protection	Battery Chemistry	Lithium Ion
Number of Cells	3 ~ 5	Fault Protection	Over Current, Over Temperature, Over/Under Voltage, Short Circuit
Interface	-	Operating Temperature	-40°C ~ 85°C (TA)
Mounting Type	Surface Mount	Base Product Number	BQ7790522
Number of series cells (min)	3, 4, 5	Number of series cells (max)	4, 5
Features	FET drive, Open wire (OW), Over-temperature (OT), Overcurrent during discharge (OCD), Overvoltage, Short-circuit Discharge (SCD), Stackable, Under-temperature (UT), Undervoltage	Operating current (typ) (µA)	6
Rating	Catalog	Vin (max) (V)	25
TI functional safety category	Functional Safety-Capable	Overvoltage protection	3.7, 3.9, 4.175, 4.2, 4.25
Operating temperature range (°C)	-40 to 85	Battery overvoltage protection (min) (V)	3
Battery overvoltage protection (max) (V)	4.575	feature-type	Battery Protection
feature-battery-type	Li-Ion\|Li-Pol	feature-process-technology
feature-maximum-supply-current-ma	0.006(Typ)	feature-minimum-operating-supply-voltage-v	3
feature-maximum-operating-supply-voltage-v	25	feature-output-voltage-v	0 to 16
feature-output-current-ma	1(Max)	feature-maximum-power-dissipation-mw
feature-packaging		feature-rad-hard
feature-pin-count	20	feature-cecc-qualified
feature-esd-protection		feature-military	No
feature-aec-qualified	Yes	feature-aec-qualified-number
feature-eccn-code	EAR99	feature-svhc	No
feature-svhc-exceeds-threshold	No