Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsPMICsPMIC - battery management Charge management Multi-Chemistry VQFN 34 Exposed Pad (7x3.5) Su

SDA

SC L

PGND

PH ASE

DCINP

PGND

CSSN

CSSP

VREF

PHASE

BOOT

DCINA

VICM

PGND

bq24765

34 LD

QFN

TOP VIEW

DCINP

VDDP

ICOUT

33 32 31

ICREF

ACIN

CSOP

CSON

9 21

8 22

EAO

EAI

FBO

VFB

AGND

ACOK

VDDSMB

PH ASE

15 16

bq24765

www.ti.com

SLUS999 –NOVEMBER 2009

SMBus-Controlled Multi-Chemistry Battery Charger With Integrated Power MOSFETs

Check for Samples :bq24765

FEATURES

– < 10-μA Battery Current with Adapter

Removed

• Integrated Power MOSFETs, NMOS-NMOS,

Synchronous Buck Converter – < 1 mA Input DCINA Current When Adapter

Present and Charge Disabled

• >95% Efficiency

• 34-pin, 3.5mmx7mm QFN Package

• Frequency 700kHz Allows Smaller Inductor

(5mm x 5mm)

APPLICATIONS

• Thermal Regulation Loop for Safety, Limit T

• Notebook and Ultra-Mobile Computers

120°C

• Portable Data-Capture Terminals

• Adaptive Driver Dead-time and 99.5%

• Portable Printers

Maximum Effective Duty Cycle

• Medical Diagnostics Equipment

• High-Accuracy Voltage and Current Regulation

• Battery Bay Chargers

– ±0.5% Charge Voltage Accuracy

• Battery Back-up Systems

– ±3% Charge Current Accuracy

– ±3% Adapter Current Accuracy

DESCRIPTION

– ±2% Input Current Sense Amp Accuracy

The bq24765 is a high-efficiency, synchronous

• Integration

battery charger with two integrated 30mΩ NMOS

power MOSFETs, and an integrated input current

– Integrated Power MOSFETs

comparator, offering low component count for

– Input Current Comparator

space-constraint, multi-chemistry battery charging

– Internal Soft-Start

applications. Input current, charge current, and

• Safety

charge voltage DACs allow for very high regulation

accuracies that can be easily programmed by the

– Thermal Regulation Loop and Thermal

system power management micro-controller using

Shutdown

SMBus. The bq24765 has switching frequency of

– Dynamic Power Management (DPM)

700kHz. The bq24765 charges 2, 3, or 4 series Li+

– Power FETs Over Current Protection cells, and is available in a 34-pin, 3.5mmx7mm QFN

package.

• 7 V–24 V AC/DC-Adapter Operating Range

• Simplified SMBus Control

– Charge Voltage DAC (1.024 V–19.2 V)

– Charge Current DAC (128 mA–8.064 A)

– Adapter Current Limit DPM DAC (256

mA–11.008 A)

• Status and Monitoring Outputs

– AC/DC Adapter Present with Adjustable

Voltage Threshold

– Input Current Comparator, With Adjustable

Threshold and Hysteresis

– Current Sense Amplifier for Current Drawn

From Input Source

• Charge Any Battery Chemistry: Li+, LiFePO4,

NiCd, NiMH, Lead Acid (2, 3, and 4 Li-Ion Cells)

• Charge Enable Pin (CE)

• Energy Star Low Iq

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.

Summary of content (37 pages)

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bq24765 www.ti.
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bq24765 SLUS999 – NOVEMBER 2009 www.ti.com This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with appropriate precautions. Failure to observe proper handling and installation procedures can cause damage. ESD damage can range from subtle performance degradation to complete device failure.
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bq24765 www.ti.com SLUS999 – NOVEMBER 2009 ORDERING INFORMATION (1) (1) PART NUMBER PACKAGE bq24765 RUV 34 Pin, 3. 5mm x 7mm QFN ORDERING NUMBER (Tape and Reel) QUANTITY bq24765RUVR 3000 bq24765RUVT 250 For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI web site at www.ti.com.
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bq24765 SLUS999 – NOVEMBER 2009 www.ti.com Table 1. Pin Functions – 34-Pin QFN (continued) PIN NO. 4 FUNCTION NAME 15 SDA SMBus Data input. Connect to SMBus data line from the host controller. A 10-kohm pull-up resistor to the host controller power rail is needed. 16 SCL SMBus Clock input. Connect to SMBus clock line from the host controller. A 10-kohm pull-up resistor to the host controller power rail is needed. 17 VDDSMB Input voltage for SMBus logic. Connect a 3.
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bq24765 www.ti.com SLUS999 – NOVEMBER 2009 ABSOLUTE MAXIMUM RATINGS over operating free-air temperature range (unless otherwise noted) (1) (2) VALUE DCINP, DCINA, CSOP, CSON, CSSP, CSSN, VFB, ACOK Voltage range UNIT –0.3 to 30 PHASE –1 to 30 EAI, EAO, FBO, VDDP, ACIN, VICM, ICOUT, ICREF, CE –0.3 to 7 VDDSMB, SDA, SCL –0.3 to 6 VREF V –0.3 to 3.6 BOOT (with respect to AGND and PGND) –0.3 to 36 Maximum difference voltage: CSOP–CSON, CSSP–CSSN –0.5 to 0.
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bq24765 SLUS999 – NOVEMBER 2009 www.ti.com ELECTRICAL CHARACTERISTICS 7.0 V ≤ V(DCINA) ≤ 24 V, 0°C < TJ < +125°C, typical values are at TA = 25°C, with respect to AGND (unless otherwise noted) PARAMETER TEST CONDITIONS MIN TYP MAX UNIT OPERATING CONDITIONS DCINA/DCINP input voltage operating range VDCIN_OP 7 24 V DCINA V 16.884 V CHARGE VOLTAGE REGULATION VVFB_OP VFB input voltage range 0 16.716 ChargeVoltage() = 0x41A0 VVFB_REG_ACC VFB charge voltage regulation accuracy –0.5% 12.
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bq24765 www.ti.com SLUS999 – NOVEMBER 2009 ELECTRICAL CHARACTERISTICS (continued) 7.
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bq24765 SLUS999 – NOVEMBER 2009 www.ti.com ELECTRICAL CHARACTERISTICS (continued) 7.0 V ≤ V(DCINA) ≤ 24 V, 0°C < TJ < +125°C, typical values are at TA = 25°C, with respect to AGND (unless otherwise noted) PARAMETER TEST CONDITIONS MIN TYP MAX 3.5 4 4.
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bq24765 www.ti.com SLUS999 – NOVEMBER 2009 ELECTRICAL CHARACTERISTICS (continued) 7.0 V ≤ V(DCINA) ≤ 24 V, 0°C < TJ < +125°C, typical values are at TA = 25°C, with respect to AGND (unless otherwise noted) PARAMETER TEST CONDITIONS MIN TYP MAX UNIT 5 10 15 mV 0.
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bq24765 SLUS999 – NOVEMBER 2009 www.ti.com Figure 2. SMBus Communication Timing Waveforms TYPICAL CHARACTERISTICS VDDP LOAD AND LINE REGULATION vs LOAD CURRENT 0.40 0.00 0.20 -0.50 VDDP Load Error - % Reference Voltage Error - % VREF LOAD AND LINE REGULATION vs LOAD CURRENT 0.00 DCIN = 20 V -0.20 -0.40 DCIN = 10 V -0.60 DCIN = 20 V -1.00 -1.50 DCIN = 10 V -2.00 -2.50 -0.80 -1.00 -3.00 0 5 10 15 20 25 30 35 40 0 ILOAD - Load Current - mA Figure 3.
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bq24765 www.ti.com SLUS999 – NOVEMBER 2009 TYPICAL CHARACTERISTICS (continued) VFB VOLTAGE REGULATION ACCURACY vs CHARGE CURRENT VFB VOLTAGE REGULATION ACCURACY vs SET POINT 0.3 0.02 0.00 Vreg = 12.592V 0.2 0.1 -0.04 Regulation Error - % Regulation Error - % -0.02 -0.06 -0.08 -0.10 -0.12 -0.14 -0.16 -0.1 -0.2 -0.3 -0.4 -0.5 -0.18 -0.20 0.0 0 -0.6 1k 2k 3k 4k 5k 6k 7k 8k 9k Current Setpoint - mA 0 10000 15000 5000 VREG DAC Set Point - mV Figure 5. Figure 6.
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bq24765 SLUS999 – NOVEMBER 2009 www.ti.com TYPICAL CHARACTERISTICS (continued) EFFICIENCY vs BATTERY CHARGE CURRENT INPUT CURRENT REGULATION (DPM) ACCURACY vs V(CSSP-CSSN) VOLTAGE SET POINT 2.0 100 4c 90 Regulation Error - % Efficiency - % 95 3c 2c 2c 85 80 1.0 0.5 Vbat_dac = 12.592, In voltage regulation 75 70 1.5 0 1k 2k 3k 4k 5k 0.0 6k 0 2k ICHG DAC Set Point - mA 8k 10k 12k DPM DAC Set Point - mA Figure 10.
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bq24765 www.ti.com SLUS999 – NOVEMBER 2009 TYPICAL CHARACTERISTICS (continued) Charge Current, Input Current Error - % INPUT REGULATION CURRENT (DPM), AND CHARGE CURRENT ACCURACY vs SYSTEM CURRENT TRANSIENT SYSTEM LOAD (DPM) RESPONSE: CHARGE CURRENT DROPPED FROM 4A TO 2A 5% 4% 3% 2% Input Current 4608mA 1% 0% -1% -2% Charge Current 4096mA -3% -4% -5% 1.5 2.0 2.5 3.0 3.5 4.0 System Current - A 4.5 5.0 Figure 13. Figure 14.
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bq24765 SLUS999 – NOVEMBER 2009 www.ti.com TYPICAL CHARACTERISTICS (continued) 14 CHARGER WHEN ADAPTER REMOVED INDUCTOR CURRENT AND BATTERY CURRENT SOFT-START Figure 17. Figure 18. CONTINUOUS CONDUCTION MODE (CCM) SWITCHING WAVEFORMS DISCONTINUOUS CONDUCTION MODE (DCM) SWITCHING WAVEFORMS Figure 19. Figure 20.
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bq24765 www.ti.com SLUS999 – NOVEMBER 2009 TYPICAL CHARACTERISTICS (continued) NEAR 100% DUTY CYCLE BOOTSTRAP RECHARGE PULSE BATTERY REMOVAL (FROM CONSTANT CURRENT MODE) Figure 21. Figure 22. BATTERY SHORTED CHARGER RESPONSE, RESET CHARGER POWER FET OVER CURRENT PROTECTION Figure 23. Figure 24.
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bq24765 SLUS999 – NOVEMBER 2009 www.ti.com TYPICAL CHARACTERISTICS (continued) CHARGE OVER CURRENT PROTECTION THERMAL REGULATION AT TA = 40°C Figure 25. Figure 26. CHARGE CURRENT vs FREE-AIR TEMPERATURE 7 ICHG - Charge Current - A 6 5 4 3 2 1 0 40 50 60 70 80 90 100 110 120 130 Free-Air Temperature - ºC Figure 27.
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bq24765 www.ti.com SLUS999 – NOVEMBER 2009 FUNCTIONAL BLOCK DIAGRAM 0.6V ENA_BIAS + ACOK ACOK + 2.4V - ACIN ENA DCIN_UVLO DCINA DCINA 3.
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bq24765 SLUS999 – NOVEMBER 2009 www.ti.com DETAILED DESCRIPTION SMBus INTERFACE The bq24765 operates as a slave, receiving control inputs from the embedded controller host through the SMBus interface. BATTERY-CHARGER COMMANDS The bq24765 supports five battery-charger commands that use either Write-Word or Read-Word protocols, as summarized in Table 2. ManufacturerID() and DeviceID() can be used to identify the bq24765.
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bq24765 www.ti.
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bq24765 SLUS999 – NOVEMBER 2009 www.ti.com A tLOW tHIGH B C D E F G H I J K SMBCLK SMBDATA A = START CONDITION B = MSB OF ADDRESS CLOCKED INTO SLAVE C = LSB OF ADDRESS C LOCKED INTO SLAVE D = R/W BIT CLOCKED INTO SLAVE E = SLAVE PULLS SMBDATA LINE LOW I = ACKNOWLEDGE CLOCK PULSE F = ACKNOWLEDGE BIT CLOCKED INTO MASTER J = STOP CONDITION G = MSB OF DATA CLOCKED INTO MASTER K = NEW START CONDITION H = LSB OF DATA CLOCKED INTO MASTER Figure 30.
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bq24765 www.ti.com SLUS999 – NOVEMBER 2009 Table 3.
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bq24765 SLUS999 – NOVEMBER 2009 www.ti.com Table 4. Charge Current Register (0x14), Using 10mΩ Sense Resistor (continued) BIT BIT NAME DESCRIPTION 11 Charge Current, DACI 4 0 = Adds 0mA of charger current 1 = Adds 2048mA of charger current. 12 Charge Current, DACI 5 0 = Adds 0mA of charger current 1 = Adds 4096mA of charger current, (Maximum charge current 8064mA.
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bq24765 www.ti.com SLUS999 – NOVEMBER 2009 Table 5. Input Current Register (0x3F), Using 10mΩ Sense Resistor (continued) BIT BIT NAME DESCRIPTION 10 Charge Current, DACS 3 0 = Adds 0mA of charger current 1 = Adds 2048mA of charger current. 11 Charge Current, DACS 4 0 = Adds 0mA of charger current 1 = Adds 4096mA of charger current, (Maximum charge current 8064mA.
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bq24765 SLUS999 – NOVEMBER 2009 www.ti.com AUTOMATIC INTERNAL SOFT-START CHARGER CURRENT The charger automatically soft-starts the output regulation current every time the charger is enabled to ensure there is no overshoot or stress on the output capacitors or the power converter. The soft-start consists of stepping-up the charge regulation current into 8 evenly divided steps up to the programmed charge current. Each step lasts around 1.6ms, for a typical rise time of 10ms.
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bq24765 www.ti.com SLUS999 – NOVEMBER 2009 The fixed frequency oscillator keeps tight control of the switching frequency under all conditions of input voltage, battery voltage, charge current, and temperature, simplifying output filter design and keeping it out of the audible noise region. The type III compensation provides phase boost near the cross-over frequency, giving sufficient phase margin.
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bq24765 SLUS999 – NOVEMBER 2009 IDCM < www.ti.com IRIPPLE 2 (VIN and IRIPPLE = æ 1ö æV ö - VBAT ) ´ ç BAT ÷ ´ ç ÷ è VIN ø è fS ø Lout (2) Where: VIN: adapter voltage VVFB: Output Voltage = VFB voltage fS: switching frequency = 700kHz LOUT: output inductor For proper cycle-by-cycle UCP sensing, the output filter capacitor should sit on CSON. Only 0.1µF capacitor is on CSOP, close to the device input.
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bq24765 www.ti.com SLUS999 – NOVEMBER 2009 HIGH ACCURACY VICM USING CURRENT SENSE AMPLIFIER (CSA) An industry standard, high accuracy current sense amplifier (CSA) is used to monitor the input current by the host or some discrete logic through the analog voltage output of the VICM pin. The CSA amplifies the input sensed voltage of CSSP-CSSN by 20x through the VICM pin. Once DCIN is above 4.5V and ACIN is above 0.6V, VICM no longer stays at ground, but becomes active.
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bq24765 SLUS999 – NOVEMBER 2009 www.ti.com ACOK Comparator ACIN 2.4V CSSP 1k + t_dg t_dg rising rising 100us 8ms ACOK ACOK ACOK_DG VICM Current Sense Amplifier + - CSSN VICM Error Amplifier Disable 20k VICM + VICM Disable Program Hysteresis of comparator by putting a resistor in feedback from ICOUT pin to ICREF pin. Input Current Comparator ICOUT + - ICREF Figure 31.
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bq24765 www.ti.com SLUS999 – NOVEMBER 2009 REMOTE SENSE The bq24765 has a dedicated remote sense pin, VFB, which allows the rejection of board resistance and selector resistance. To fully utilize remote sensing, connect VFB directly to the battery interface through an unshared battery sense Kelvin trace, and place a 0.1µF ceramic capacitor near the VFB pin to AGND. Remote Kelvin Sensing provides higher regulation accuracy, by eliminating parasitic voltage drops.
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bq24765 SLUS999 – NOVEMBER 2009 www.ti.com Component List for Typical System Circuit of PART DESIGNATOR Qty DESCRIPTION Q1, Q2, Q6 3 P-channel MOSFET, –30V,-7.5A, SO-8, Vishay-Siliconix, Si4835 RAC, RSR 2 Sense Resistor, 10 mΩ, 1W, 2010, Vishay-Dale, WSL2010R0100F L1 1 Inductor, 2.2µH, 8A, 20 mΩ, Vishay, IHLP2525CZ01-2R2 4xC2, 2xC9, 3xC13 9 Capacitor, Ceramic, 10 µF, 35V, 20%, X5R, 1206, Panasonic, ECJ-3YB1E106M C1 1 Capacitor, Ceramic, 2.
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE MATERIALS INFORMATION www.ti.com 14-Jul-2012 TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Pins Type Drawing SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant BQ24765RUVR VQFN RUV 34 3000 330.0 16.4 3.85 7.35 1.2 8.0 16.0 Q1 BQ24765RUVT VQFN RUV 34 250 180.0 16.4 3.85 7.35 1.2 8.0 16.
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PACKAGE MATERIALS INFORMATION www.ti.com 14-Jul-2012 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) BQ24765RUVR VQFN RUV 34 3000 367.0 367.0 38.0 BQ24765RUVT VQFN RUV 34 250 210.0 185.0 35.
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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.