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FEATURES

APPLICATIONS

DESCRIPTION

bq78PL114

PowerLAN™ Master Gateway Battery Management Controller

With PowerPump™ Cell Balancing Technology

• Portable Medical Instruments and Test

23

• Designed for Managing up to 12 Series Cell

Equipment

Battery Systems

• Mobility Devices (E-Bike)

• SmartSafety Features:

• Uninterruptible Power Supplies and Hand-Held

–

Prevention: Optimal Cell Management

Tools

–

Diagnosis: Improved Sensing of Cell

Problems

–

Fail Safe: Detection of Event Precursors

The bq78PL114 master gateway battery controller is

• Rate-of-Change Detection of All Important Cell

part of a complete Li-Ion control, monitoring, and

Characteristics:

safety solution designed for large series cell strings.

–

Voltage

The bq78PL114, along with PowerLAN cell monitors,

–

Impedance

provides

complete

battery

system

control,

communications, and safety functions for a structure

–

Cell Temperature

of three to 12 series cells. This PowerLAN system

• PowerPump Technology Transfers Charge

provides simultaneous, synchronized voltage and

Efficiently From Cell to Cell During All

temperature measurements using one-ADC-per-cell

Operating Conditions, Resulting in Longer

technology.

Voltage

measurements

are

also

Run Time and Cell Life

synchronized

with

pack

current

measurements,

eliminating

system-induced

noise

from

• High-Resolution 18-Bit Integrating Delta-Sigma

measurements. This allows the precise, continuous,

Coulomb Counter for Precise Charge-Flow

real-time calculation of cell impedance under all

Measurements and Gas Gauging

operating conditions, even during widely fluctuating

• Multiple Independent Δ-Σ ADCs: One-per-Cell

load conditions.

Voltage, Plus Separate Temperature, Current,

PowerPump technology transfers charge between

and Safety

cells to balance their voltage and capacity. Balancing

• Simultaneous, Synchronous Measurement of

is

possible

during

all

battery

modes:

charge,

Pack Current and Individual Cell Voltages

discharge, and rest. Highly efficient charge-transfer

• Very Low Power Consumption: < 250 µA

circuitry nearly eliminates energy loss while providing

Active, < 150

µA Standby, < 40 µA Ship, and

true real-time balance between cells, resulting in

longer run-time and improved cycle life.

< 1-

µA Undervoltage Shutdown

• Accurate, Advanced Temperature Monitoring

Temperature is sensed by up to six external sensors.

of Cells and MOSFETs With up to Six Sensors

This permits accurate temperature monitoring of each

cell individually. Firmware is then able to compensate

• Fail-Safe Operation of Pack Protection

for the temperature-induced effects on capacity,

Circuits: Up to Three Power MOSFETs and

impedance, and OCV on a cell-by-cell basis, resulting

One Secondary Safety Output (Fuse)

in superior charge/ discharge and balancing control.

• Fully Programmable Voltage, Current, Balance,

External

MOSFET

control

inputs

provide

user-

and Temperature-Protection Features

definable direct hardware control over MOSFET

• External Inputs for Auxiliary MOSFET Control

states. Smart control prevents excessive current

• Smart Battery System 1.1 Compliant via

through MOSFET body diodes. Auxiliary inputs can

be used for enhanced safety and control in large

SMBus or SPI Interface With SHA-1

multicell arrays.

Authentication Option

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Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas

Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2

PowerLAN, PowerPump, bqWizard are trademarks of Texas Instruments.

3

All other trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Copyright © 2008, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.