BQ29312A

Manufacturer Part NumberBQ29312A
ManufacturerTexas Instruments
BQ29312A datasheet
 


Specifications of BQ29312A

Cells Protected2, 3, 4Protection FetsExternal
Shutdown Current(ua)1Pin/package24TSSOP, 24VQFN
Over-voltage Protection(v)YesOperating Temperature Range(c)-40 to 85
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TWO-CELL, THREE-CELL, AND FOUR-CELL LITHIUM-ION OR
LITHIUM-POLYMER BATTERY PROTECTION AFE
FEATURES
2-, 3-, or 4-Cell Series Protection Control
Can Directly Interface With the bq2084 Gas
Gauges
Provides Individual Cell Voltages and Battery
Voltage to Battery Management Host
Integrated Cell Balancing Drive
2
I
C Compatible User Interface Allows Access
to Battery Information
Programmable Threshold and Delay for
Overload and Short Circuit During Charge and
Discharge
System Alert Interrupt Output
Host Control Can Initiate Sleep Power Mode
and Ship Mode
Integrated 3.3-V, 25-mA LDO
Supply Voltage Range From 4.5 V to 25 V
Low Supply Current of 60-µA Typical
bq29312A is 100% specification compatible
with the bq29312
SYSTEM PARTITIONING DIAGRAM
Pack +
bq2084
Precharge Control
Power Management
LDO, TOUT, and Power Mode control
Temperature Measurement
<1% Error
768 Bytes of
User Flash
Cell Balancing Algorithm and Control
SMBus
SBS v1.1 Data
bq29312 RAM/Comms Validation
1 st Level OC
Protection
Pack Undervoltage
Power Mode
Control
Capacity Prediction <1% Error
Pack -
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.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
PW
RTH
APPLICATIONS
Notebook PCs
Medical and Test Equipment
Portable Instrumentation
DESCRIPTION
The bq29312A is a 2-, 3-, or 4-cell lithium-ion battery
pack protection analog front end (AFE) IC that
incorporates a 3.3-V, 25-mA low-dropout regulator
(LDO). The bq29312A also integrates an I
ible interface to extract battery parameters such as
cell voltages and control output status. Other par-
ameters such as current protection thresholds and
delays can be programmed into the bq29312A to
increase the flexibility of the battery management
system.
The bq29312A provides safety protection for over-
charge, overload, short-circuit, overvoltage, and
undervoltage conditions with the battery management
host. In overload and short-circuit conditions, the
bq29312A turns the FET drive off autonomously
dependant on the internal configuration setting.
Fuse
PF Input
PCH FET Drive
Fail-Safe Protection
Supply V oltage
Precharge
FET Drive
T INT
LDO, Therm Output Drive & UVLO
T1
32-kHz Clock
System Watchdog
Generator
32 kHz
System Interface
System Interface
I 2 C
XAlert
Sleep
1 st Level OV and
Power Mode Control
UV Protection
Cell and Pack
Voltage
2-Tier Overcurrent Protection
Measurement
Voltage Level Translator
Sense Resistor
(10 - 30 m W)
bq29312A
SLUS629A – JANUARY 2005 – REVISED AUGUST 2005
2
C compat-
Discharge / Charge /
Precharge FETs
bq29312A
Cell Balancing
Drive
Delay Counters
RAM Registers
Copyright © 2005, Texas Instruments Incorporated

BQ29312A Summary of contents

  • Page 1

    ... APPLICATIONS Notebook PCs Medical and Test Equipment Portable Instrumentation DESCRIPTION The bq29312A is a 2-, 3-, or 4-cell lithium-ion battery pack protection analog front end (AFE) IC that incorporates a 3.3-V, 25-mA low-dropout regulator (LDO). The bq29312A also integrates an I ible interface to extract battery parameters such as cell voltages and control output status. Other par- ...

  • Page 2

    ... For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI website at www.ti.com. (2) The bq29312A can be ordered in tape and reel by adding the suffix R to the orderable part number, ie: bq29312APWR bq29312ARTHR. (3) The QFN package is also made available in mini reel, add suffix T to the orderable part number, ie: bq29312ARTHT. ...

  • Page 3

    ... REG and TOUT as (PACK) required. Once V is above the start-up voltage, it can fall down to the minimum supply voltage and still meet the specifications of (PACK) the bq29312A. VC1, VC2, VC3, VC4 SR1, SR2 VC5 VCn – VC(n+1 ...

  • Page 4

    ... SLUS629A – JANUARY 2005 – REVISED AUGUST 2005 ELECTRICAL CHARACTERISTICS T = 25° 4.7 µF, BAT = 14 V (unless otherwise noted) A (REG) PARAMETER SUPPLY CURRENT No load at REG, TOUT, XALERT, SCLK, and SDATA. I Supply current 1 ZVCHG = off ,VMEN = on, WDI no clock, CC1 Select VC5 = VC4 = 0 V Supply current No load at REG, TOUT, XALERT, SCLK, and SDATA ...

  • Page 5

    ... V O (ON) REG T = –25°C to 85°C A XALERT SDATA, SCLK, XALERT 200 µA, O SDATA µ mA, O bq29312A SLUS629A – JANUARY 2005 – REVISED AUGUST 2005 MIN NOM MAX –50 –205 100 475 –100 –475 25 – ...

  • Page 6

    ... SLUS629A – JANUARY 2005 – REVISED AUGUST 2005 AC ELECTRICAL CHARACTERISTICS T = 25° 4.7 µF, BAT = 14 V (unless otherwise noted) A (REG) PARAMETER t WDT start-up detect time (WDTINT) t WDT detect time (WDWT) AC TIMING SPECIFICATIONS (I PARAMETER t SCLK SDATA rise time r t SCLK SDAT fall time ...

  • Page 7

    ... TOUT SR2 16 XALERT 15 GND SDATA 14 13 SCLK Terminal Functions DESCRIPTION internally, open or H level makes Sleep mode (REG) bq29312A SLUS629A – JANUARY 2005 – REVISED AUGUST 2005 RTH PACKAGE (TOP VIEW) ZVCHG CHG SLEEP REG TOUT XALERT pullup (REG) pullup to V ...

  • Page 8

    ... SLUS629A – JANUARY 2005 – REVISED AUGUST 2005 PACK- PACK+ PMS ZVCHG REG Gate Driver + 0.2 Current Source 200 k SLEEP CONTROL SLEEP 32-kHz INPUT FROM GG WDI Registers Status Output Ctl State Ctl SDATA GG INTERFACE Function Ctl SDATA CELL_SEL GG INTERFACE OCDV SCLK ...

  • Page 9

    ... STATE CTL REGISTER CURRENT FAULT : OFF AND NO SUPPLY CELL MONITOR : OFF POWER TO PACK WATCHDOG : OFF THERMISTOR PWER CTRL : OFF bq29312A SLUS629A – JANUARY 2005 – REVISED AUGUST 2005 HOST FAULT MODE SHIP MODE FETS: OFF REG: OFF 2 I ...

  • Page 10

    ... After the regulator has started, based on PACK voltage, it keeps operating through the BAT input, even if the PACK voltage is removed. If the BAT input is below the minimum operating range, then the bq29312A does not operate if the supply to the PACK input is removed. After start up, when the REG voltage is above 2.4 V, the bq29312A is in Normal mode ...

  • Page 11

    ... REF REF OS ) (ACT) ) × V – V }/K (ACT) OS(ACT) (CELLOUT) for each cell voltage should be measured. OS(ACT) SLUS629A – JANUARY 2005 – REVISED AUGUST 2005 + ( × V – K × REF OS REF – {V – V }/K (ACT) O(4-5) (CELLOUT) (ACT) bq29312A = K × REF 11 ...

  • Page 12

    ... SLUS629A – JANUARY 2005 – REVISED AUGUST 2005 FUNCTIONAL DESCRIPTION (continued) Measuring O(3-4) O(2-3), O(1-2), VC4 – VC5 = {V – V( O(4-5) CELLOUT) VC3 – VC4 = {V – V O(3-4) (CELLOUT) VC2 – VC3 = {V – V O(2-3) (CELLOUT) VC1 – VC2 = {V – V O(1-2) (CELLOUT) Cell Balance Control The cell balance control allows a small bypass path to be controlled for any one series element. The purpose of this bypass path is to reduce the current into any one cell during charging to bring the series elements to the same voltage ...

  • Page 13

    ... Figure 1. LTCLR and XALERT Clear Example After Sensing Short LTCLR and XALER Clear Example SLUS629A – JANUARY 2005 – REVISED AUGUST 2005 LTCLR LTCLR Write = 1 Write = 0 Access Enable Access Enable Status Disable Access Enable Status Disable Short Current Timeout in Discharge Direction bq29312A Read STATUS Register 13 ...

  • Page 14

    ... The bq29312A drives the DSG, CHG, and ZVCHG FET off safety threshold is breached depending on the current direction. The host can force any FET on or off only if the bq29312A integrated protection control allows. The DSG and CHG FET drive gate-to-drain voltage is clamped (typ). ...

  • Page 15

    ... SLEEP mode. The SLEEP mode disables all the FET outputs and the OL, SC, and watchdog faults are also disabled. The RAM configuration is still valid on exit of the SLEEP mode. The host can force the bq29312A into SLEEP mode via register control also. ...

  • Page 16

    ... The bq29312A acts as a slave device and does not generate clock pulses. Communication to the bq29312A is provided from GPIO pins host system controller. The slave address for the bq29312A is 7 bits and the value is 0100 000 (0x20). (MSB) ...

  • Page 17

    ... ZVCLMP The STATUS register provides information about the current state of the bq29312A. Reading the STATUS register clears the XALERT pin. STATUS b0 (SCDSG): This bit indicates a short-circuit in the discharge direction Current below the short-circuit threshold in the discharge direction (default Current greater than or equal to the short-circuit threshold in the discharge direction. ...

  • Page 18

    ... SLUS629A – JANUARY 2005 – REVISED AUGUST 2005 The OUTPUT CTL register controls the outputs of the bq29312A and can be used to clear certain states. OUTPUT CTL b0 (LTCLR): When a current limit fault or watchdog timer fault is latched, this bit releases the fault latch when toggled from and back to 0 (default =0). ...

  • Page 19

    ... TOUT The FUNCTION CTL register enables and disables functions of the bq29312A. FUNCTION CTL b0 (VMEN): This bit enables or disables the cell and battery voltage monitoring function disable voltage monitoring (default). CELL output is pulled down to GND level enable voltage monitoring. FUNCTION CTL b1 (PACKOUT): This bit is used to translate the PACK input to the CELL pin when VMEN=1. ...

  • Page 20

    ... SLUS629A – JANUARY 2005 – REVISED AUGUST 2005 CELL_SEL b4–b7 (CB0–CB3): These 4 bits select the series cell for cell balance bypass path. CELL SEL b4 (CB0): This bit enables or disables the bottom series cell balance charge bypass path disable bottom series cell balance charge bypass path (default). ...

  • Page 21

    ... V 1001 0.250 V 1010 0.275 V 1011 244 µs 1000 305 µs 1001 366 µs 1010 427 µs 1011 bq29312A SLUS629A – JANUARY 2005 – REVISED AUGUST 2005 0.300 V 1100 0.400 V 0.325 V 1101 0.425 V 0.350 V 1110 0.450 V 0.375 V 1111 0.475 V 488 µs 1100 732 µ ...

  • Page 22

    ... In order to charge, the charge FET (CHG-FET) must be turned on to create a current path. When the V V and CHG-FET = ON, the V (PACK) is too low to operate. There are three possible configurations for this function and the bq29312A can be easily configured according to the application needs. The three modes are 0-V Charge FET Mode, Common FET Mode, and Precharge FET Mode. ...

  • Page 23

    ... Precharge Current Figure 8. Drain Current vs Drain-Source Voltage Characteristics In the bq29312A, the initial state is for CHG-FET = OFF and ZVCHG-FET = ON with the V V initially. Then, the charger applies a constant current and raises V current, point A. For example, if the V ZVCHG-FET is used in its MOS saturation region at this point so that V ...

  • Page 24

    ... Figure holds the supply voltage for bq29312A operation. After V bq29312A operation, the CHG-FET and the DSG-FET are turned ON and ZVCHG-FET is turned OFF. Although the current path is changed, the same precharging current is still applied. When V charging voltage (typical 3 V per cell), the charger switches into fast charging mode. ...

  • Page 25

    ... When this level is reached, the CHG pin changes its state from GND to the level controlled with CHG bit in bq29312A registers. In this state, the CHG output level is driven by a clamp circuit so that its voltage level changes from Also, the host controller is active and can turn ON the DSG-FET. ...

  • Page 26

    ... SLUS629A – JANUARY 2005 – REVISED AUGUST 2005 APPLICATION INFORMATION (continued) The disadvantages is that during 0-V charging, bq29312A is inactive. The device does not protect the battery and does not update battery information (now charging) to the PC. There are two advantage of this configuration: 1 ...

  • Page 27

    ... This mode has a dedicated precharge current path using an additional open drain driven FET (PCHG-FET) and sustains the V level. In this mode, where the PMS input is connected to GND, the bq29312A and host (PACK) combine to provide the precharge function by limiting the fast charge current which is provided by the system side charger ...

  • Page 28

    ... DS (PCHG) Figure 14. When the drain-source voltage ( (PACK) (BAT) Figure 15. . The bq29312A REG output then becomes active and supplies power to (PACK) www.ti.com Charger CC DC Input I (FASTCHG Fast Current in the precharge path limits the precharge ) is high enough the ...

  • Page 29

    ... OFF OFF PCHG FET = ON CHG FET = OFF DSG FET = ON OFF Charge 0 V and Fast Charge Precharge Mode Mode bq29312A SLUS629A – JANUARY 2005 – REVISED AUGUST 2005 ; therefore, as temperature (PCHG) Charge 3 ”L” ”L” ...

  • Page 30

    ... Charge FET (1) vs Precharge FET (3) The current paths of the 0-V charge FET (1) and Precharge FET (3) modes are the same. If the 0-V charge FET (1) mode is used with chargers without precharge function, the bq29312A consumes extra current order to turn ON the ZVCHG output. ...

  • Page 31

    ... BQ29312APW ACTIVE BQ29312APWG4 ACTIVE BQ29312APWR ACTIVE BQ29312APWRG4 ACTIVE BQ29312ARTHR ACTIVE BQ29312ARTHRG4 ACTIVE (1) The marketing status values are defined as follows: ACTIVE: Product device recommended for new designs. LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect. NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design ...

  • Page 32

    ... TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Type Drawing BQ29312APWR TSSOP PW BQ29312ARTHR VQFN RTH PACKAGE MATERIALS INFORMATION Pins SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) 24 2000 330.0 16.4 6.95 24 3000 330.0 12.4 4.25 Pack Materials-Page 1 8-Dec-2009 Pin1 ...

  • Page 33

    ... Device Package Type BQ29312APWR TSSOP BQ29312ARTHR VQFN PACKAGE MATERIALS INFORMATION Package Drawing Pins SPQ Length (mm 2000 RTH 24 3000 Pack Materials-Page 2 8-Dec-2009 Width (mm) Height (mm) 346.0 346.0 33.0 346.0 346.0 29.0 ...

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    ... Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete. All products are sold subject to TI’ ...