Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsPMICsPMIC - battery management Charge management Li-Ion, Li-Po VQFN 20 (3.5x4.5) Surface-mount

3,5 mm x 4,5 mm

Actual Size

FEATURES DESCRIPTION

APPLICATIONS

STAT1

VCC

TTC

ISET1

ISET2

RHL PACKAGE

(TOP VIEWBQ24123)

STAT2

PGND

SNS

BAT

CELLS

OUT

VTSB

VSS

bq24120

bq24123

bq24125

www.ti.com

.................................................................................................................................................... SLUS688G – MARCH 2006 – REVISED AUGUST 2008

SINGLE-CHIP SWITCHMODE, LI-ION AND LI-POLYMER CHARGE-MANAGEMENT

IC WITH ENHANCED EMI PERFORMANCE( bqSWITCHER™)

• Enhanced EMI Performance

The bqSWITCHER™ series are highly integrated

Li-ion and Li-polymer switch-mode charge

• Integrated Power FETs For Up To 2-A Charge

management devices targeted at a wide range of

Rate

portable applications. The bqSWITCHER™ series

• Suitable For 1-, 2-, or 3-Cell Li-Ion and

offers integrated synchronous PWM controller and

Li-Polymer Battery Packs

power FETs, high-accuracy current and voltage

• Synchronous Fixed-Frequency PWM

regulation, charge preconditioning, charge status, and

Controller Operating at 1.1 MHz With 0% to

charge termination, in a small, thermally enhanced

QFN package.

100% Duty Cycle

• High-Accuracy Voltage and Current Regulation

The bqSWITCHER charges the battery in three

phases: conditioning, constant current, and constant

• Status Outputs For LED or Host Processor

voltage. Charge is terminated based on user-

Interface Indicates Charge-In-Progress, Charge

selectable minimum current level. A programmable

Completion, Fault, and AC-Adapter Present

charge timer provides a safety backup for charge

Conditions

termination. The bqSWITCHER automatically restarts

• 20-V Absolute Maximum Voltage Rating on IN

the charge cycle if the battery voltage falls below an

and OUT Pins

internal threshold. The bqSWITCHER automatically

enters sleep mode when V

supply is removed.

• Accurate High-Side Battery Current Sensing

• Battery Temperature Monitoring

• Automatic Sleep Mode for Low Power

Consumption

• Reverse Leakage Protection Prevents Battery

Drainage

• Thermal Shutdown and Protection

• Built-In Battery Detection

• Available in 20 pin 3,5 mm x 4,5 mm QFN

Package

• Handheld Products

• Portable Media Players

• Industrial and Medical Equipment

• Portable Equipment

• Portable DVD Players

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 bqSWITCHER, PowerPAD 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.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

Summary of content (37 pages)

PAGE 1
bq24120 bq24123 bq24125 Actual Size 3,5 mm x 4,5 mm www.ti.com....................................................................................................................................................
PAGE 2
bq24120 bq24123 bq24125 SLUS688G – MARCH 2006 – REVISED AUGUST 2008.................................................................................................................................................... www.ti.com These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates.
PAGE 3
bq24120 bq24123 bq24125 www.ti.com....................................................................................................................................................
PAGE 4
bq24120 bq24123 bq24125 SLUS688G – MARCH 2006 – REVISED AUGUST 2008.................................................................................................................................................... www.ti.
PAGE 5
bq24120 bq24123 bq24125 www.ti.com....................................................................................................................................................
PAGE 6
bq24120 bq24123 bq24125 SLUS688G – MARCH 2006 – REVISED AUGUST 2008.................................................................................................................................................... www.ti.com TERMINAL FUNCTIONS TERMINAL NAME I/O DESCRIPTION bq24120 bq24123 bq24125 BAT 14 14 14 I Battery voltage sense input. Bypass it with a capacitor to VSS if there are long inductive leads to battery. CE 16 16 16 I Charger enable input.
PAGE 7
bq24120 bq24123 bq24125 www.ti.com.................................................................................................................................................... SLUS688G – MARCH 2006 – REVISED AUGUST 2008 TYPICAL APPLICATION CIRCUITS ICHARGE = 1.3A, IPRECHARGE = 133mA, Charge Safety Timer = 5.0 hours, Battery Charging Qualification Temperature Range = 0°C to 45°C LO BQ24120 VIN CIN 1.5 KW 10 mF 1.5 KW Adapter Present 1.
PAGE 8
bq24120 bq24123 bq24125 SLUS688G – MARCH 2006 – REVISED AUGUST 2008.................................................................................................................................................... www.ti.com TYPICAL APPLICATION CIRCUITS (continued) ICHARGE = 1.3A, IPRECHARGE = 133mA, Charge Safety Timer = 5.0 hours, Battery Charging Qualification Temperature Range = 0°C to 45°C LOUT BQ24125 VIN CIN 1.5 KW 10 mF 1.5 KW Adapter Present 1.
PAGE 9
bq24120 bq24123 bq24125 www.ti.com.................................................................................................................................................... SLUS688G – MARCH 2006 – REVISED AUGUST 2008 TYPICAL OPERATING PERFORMANCE See Figure 1 for a 1-cell application test circuit schematic and Figure 2 for the stand-alone cells application test circuits schematic.
PAGE 10
bq24120 bq24123 bq24125 SLUS688G – MARCH 2006 – REVISED AUGUST 2008.................................................................................................................................................... www.ti.com CH3 1.38 A CH3 200 mA/div CH3 = Inductor Current CH1 = BAT CH1 2 V/div CH1 3.8 V CH2 = OUT CH2 5 V/div CH2 9V t = Time = 400 ns/div Figure 7. Switching Waveforms in Fast Charge Mode CH3 = Inductor Current CH3 500 mA CH3 500 mA/div CH1 = BAT CH1 8.
PAGE 11
bq24120 bq24123 bq24125 www.ti.com.................................................................................................................................................... SLUS688G – MARCH 2006 – REVISED AUGUST 2008 CH1 = BAT CH1 2 V/div CH1 4.2 V CH3 = Inductor Current CH3 200 mA/div CH3 480 mA CH2 = OUT CH2 5V CH2 2 V/div 20 ns 35 ns t = Time = 50 ns/div Figure 9. Dead Time CH1 = BAT CH1 3.8 V CH1 2 V/div CH3 = Inductor Current CH3 1.
PAGE 12
Submit Documentation Feedback Product Folder Link(s): bq24120 bq24123 bq24125 VCC Term & Timer Disable VCC VTSB VCC VSS TTC STAT2 STAT1 CE PG VTSB VCC IN IN 0.5V 1V TERM OVP Charge (STATE MACHINE) TIMER FF CHAIN PRE-CHG TIMEOUT TIMER CLK *Patent Pending #36889 TG CONTROL LOGIC DSABL_TERM PRE-CHARGE W AKE DISCHARGE 0.25V bq2410x CE CHARGE 50 mV BA T Icntrl V(3.6A) Sense FET VCC-6V VCC PG VCC Poff 2.1V 0.
PAGE 13
bq24120 bq24123 bq24125 www.ti.com....................................................................................................................................................
PAGE 14
bq24120 bq24123 bq24125 SLUS688G – MARCH 2006 – REVISED AUGUST 2008.................................................................................................................................................... www.ti.com DETAIL DESCRIPTION The bqSWITCHER™ supports a precision Li-ion or Li-polymer charging system for single cell or two cell applications. See Figure 11 and Figure 12 for a typical charge profile.
PAGE 15
bq24120 bq24123 bq24125 www.ti.com.................................................................................................................................................... SLUS688G – MARCH 2006 – REVISED AUGUST 2008 Cycle-by-cycle current limit is sensed through the internal high-side sense FET. The threshold is set to a nominal 3.6A peak current. The low-side FET also has a current limit that decides if the PWM Controller will operate in synchronous or non-synchronous mode.
PAGE 16
bq24120 bq24123 bq24125 SLUS688G – MARCH 2006 – REVISED AUGUST 2008.................................................................................................................................................... www.ti.com Battery Preconditioning (Precharge) On power up, if the battery voltage is below the VLOWV threshold, the bqSWITCHER applies a precharge current, IPRECHG, to the battery. This feature revives deeply discharged cells.
PAGE 17
bq24120 bq24123 bq24125 www.ti.com.................................................................................................................................................... SLUS688G – MARCH 2006 – REVISED AUGUST 2008 where R(SNS) is the external current-sense resistor VTERM is the output of the ISET2 pin K(ISET2) is the A/V gain factor VTERM and K(ISET2) are specified in the Electrical Characteristics table As a safety backup, the bqSWITCHER also provides a programmable charge timer.
PAGE 18
bq24120 bq24123 bq24125 SLUS688G – MARCH 2006 – REVISED AUGUST 2008.................................................................................................................................................... www.ti.com Timer Fault Recovery As shown in Figure 11, bqSWITCHER provides a recovery method to deal with timer fault conditions. The following summarizes this method. Condition 1 VI(BAT) above recharge threshold (VOREG - VRCH) and timeout fault occurs.
PAGE 19
bq24120 bq24123 bq24125 www.ti.com.................................................................................................................................................... SLUS688G – MARCH 2006 – REVISED AUGUST 2008 Battery Detection For applications with removable battery packs, bqSWITCHER provides a battery absent detection scheme to reliably detect insertion and/or removal of battery packs.
PAGE 20
bq24120 bq24123 bq24125 SLUS688G – MARCH 2006 – REVISED AUGUST 2008.................................................................................................................................................... www.ti.com VBAT Battery Connected VOREG No Battery Detected 2V/cell No Battery Detected Yes Battery Detected IWAKE IBAT - IDISCHRG1 t DISCHRG1 tWAKE t DISCHRG1 Figure 15.
PAGE 21
bq24120 bq24123 bq24125 www.ti.com.................................................................................................................................................... SLUS688G – MARCH 2006 – REVISED AUGUST 2008 Figure 16. Battery Detection Waveform When a Battery is Inserted Figure 17 shows the Battery Detection scheme when a battery is removed. Channel 3 is the output signal and Channel 4 is the output current.
PAGE 22
bq24120 bq24123 bq24125 SLUS688G – MARCH 2006 – REVISED AUGUST 2008.................................................................................................................................................... www.ti.com Current Sense Amplifier BQ2412X family offers a current sense amplifier feature that translates the charge current into a DC voltage. Figure 18 is a block diagram of this feature. OUT ICHARGE SNS RSNS + KISET2 BAT + - + FASTCHG Disable ISET2 RISET2 Figure 18.
PAGE 23
bq24120 bq24123 bq24125 www.ti.com.................................................................................................................................................... SLUS688G – MARCH 2006 – REVISED AUGUST 2008 SYSTEM DESIGN EXAMPLE AND APPLICATIONS INFORMATION The following section provides a detailed system design example for the bq24120. System Design Specifications: • • • • • • • 1. VIN = 16V VBAT = 4.2V (1-Cell) ICHARGE = 1.33 A IPRECHARGE = ITERM = 133 mA Safety Timer = 5.
PAGE 24
bq24120 bq24123 bq24125 SLUS688G – MARCH 2006 – REVISED AUGUST 2008.................................................................................................................................................... www.ti.com 3. Determine the sense resistor using the following equation: V R SNS + RSNS I CHARGE (15) In order to get better current regulation accuracy (±10%), let VRSNS be between 100 mV and 200 mV. Use VRSNS = 100 mV and calculate the value for the sense resistor. R SNS + 100 mV 1.
PAGE 25
bq24120 bq24123 bq24125 www.ti.com.................................................................................................................................................... SLUS688G – MARCH 2006 – REVISED AUGUST 2008 VTSB RT1 TS RTH RT2 103AT Figure 20.
PAGE 26
bq24120 bq24123 bq24125 SLUS688G – MARCH 2006 – REVISED AUGUST 2008.................................................................................................................................................... www.ti.com APPLICATION INFORMATION Charging Battery and Powering System Without Affecting Battery Charge and Termination RSYS LO BQ24120 VIN CIN 1.5 KW 10 mF 1.5 KW Adapter Present 1.
PAGE 27
bq24120 bq24123 bq24125 www.ti.com.................................................................................................................................................... SLUS688G – MARCH 2006 – REVISED AUGUST 2008 Using bq24125 to charge the LiFePO4 battery The LiFePO4 battery has many unique features such as a very high thermal runaway temperature, high discharge current capability, and high charge current. These special features make it attractive in many applications such as power tools.
PAGE 28
bq24120 bq24123 bq24125 SLUS688G – MARCH 2006 – REVISED AUGUST 2008.................................................................................................................................................... www.ti.com THERMAL CONSIDERATIONS Thermal Considerations The SWITCHER is packaged in a thermally enhanced MLP package. The package includes a thermal pad to provide an effective thermal contact between the IC and the printed circuit board (PCB).
PAGE 29
bq24120 bq24123 bq24125 www.ti.com.................................................................................................................................................... SLUS688G – MARCH 2006 – REVISED AUGUST 2008 PCB LAYOUT CONSIDERATION It is important to pay special attention to the PCB layout. The following provides some guidelines: • To obtain optimal performance, the power input capacitors, connected from input to PGND, should be placed as close as possible to the bqSWITCHER.
PAGE 30
PACKAGE OPTION ADDENDUM www.ti.
PAGE 31
PACKAGE OPTION ADDENDUM www.ti.com 27-Jul-2013 Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.
PAGE 32
PACKAGE MATERIALS INFORMATION www.ti.com 27-Jul-2013 TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Pins Type Drawing BQ24120RHLR VQFN RHL 20 SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant 3000 330.0 12.4 3.8 4.8 1.6 8.0 12.0 Q1 BQ24120RHLT VQFN RHL 20 250 180.0 12.4 3.8 4.8 1.6 8.0 12.0 Q1 BQ24123RHLR VQFN RHL 20 3000 330.0 12.4 3.8 4.8 1.6 8.0 12.
PAGE 33
PACKAGE MATERIALS INFORMATION www.ti.com 27-Jul-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) BQ24120RHLR VQFN RHL 20 3000 367.0 367.0 35.0 BQ24120RHLT VQFN RHL 20 250 210.0 185.0 35.0 BQ24123RHLR VQFN RHL 20 3000 367.0 367.0 35.0 BQ24123RHLT VQFN RHL 20 250 210.0 185.0 35.0 BQ24125RHLR VQFN RHL 20 3000 370.0 355.0 55.0 BQ24125RHLR VQFN RHL 20 3000 367.0 367.0 35.
PAGE 34
PAGE 35
PAGE 36
PAGE 37
IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest issue. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.