Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsPMICsPMIC - battery management Charge management Li-Ion, Li-Po VQFN 24 (4x4) Surface-mount

PMID

SCL

SDA

INT

HOST

BYP

PGND STAT

DRV

System

Load

BOOT

SYS

BAT

TEMP

PACK+

PACK–

–

bq24272

www.ti.com

SLUSB09 –JUNE 2012

2.5A, Single Input, Single Cell Switchmode Li-Ion Battery Charger with Power Path

Management

Check for Samples: bq24272

FEATURES

– JEITA Compatible

• Thermal Regulation Protection for Output

• High-Efficiency Switch Mode Charger with

Current Control

Separate Power Path Control

• BAT Short-Circuit Protection

– Instantly Startup System from a Deeply

Discharged Battery or No Battery

• Soft-Start Feature to Reduce Inrush Current

• 20V input rating, with 10.5V Over-Voltage

• Thermal Shutdown and Protection

Protection (OVP)

• Available in Small 49-ball WCSP or QFN-24

• Integrated FETs for Up to 2.5A Charge Rate

Packages

• Highly Integrated Battery N-Channel MOSFET

APPLICATIONS

Controller for Power Path Management

• Safe and Accurate Battery Management • Handheld Products

Functions

• Portable Media Players

– 0.5% Battery Regulation Accuracy

• Portable Equipment

– 10% Charge Current Accuracy

• Tablets and Portable Internet Devices

• Voltage-based, NTC Monitoring Input (TS)

APPLICATION SCHEMATIC

DESCRIPTION

The bq24272 is a highly integrated single cell Li-Ion battery charger and system power path management device

targeted for space-limited, portable applications with high capacity batteries. The single cell charger operates

from a dedicated power source such as a wall adapter or wireless power supply for a versatile solution.

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 (33 pages)

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bq24272 www.ti.com SLUSB09 – JUNE 2012 2.
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bq24272 SLUSB09 – JUNE 2012 www.ti.com The power path management feature allows the bq24272 to power the system from a high efficiency DC to DC converter while simultaneously and independently charging the battery. The charger monitors the battery current at all times and reduces the charge current when the system load requires current above the input current limit. This allows for proper charge termination and timer operation.
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bq24272 www.ti.com SLUSB09 – JUNE 2012 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. ORDERING INFORMATION (1) PART NUMBER OVP NTC MONITORING (TS) JEITA COMPATIBLE MINIMUM SYSTEM VOLTAGE PACKAGE bq24272YFFR 10.5 V Yes No 3.5 V WCSP bq24272YFFT 10.5 V Yes No 3.5 V WCSP bq24272RGER 10.5 V Yes No 3.5 V QFN bq24272RGET 10.
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bq24272 SLUSB09 – JUNE 2012 www.ti.com RECOMMENDED OPERATING CONDITIONS MIN VIN 4.2 18 (1) IN operating range 4.2 10 IIN Input current ISYS Output current from SW, DC IBAT TJ (1) MAX UNITS IN voltage range 2.5 A 3 A Charging 2.5 Discharging, using internal battery FET 2.5 Operating junction temperature range 0 V A 125 °C The inherent switching noise voltage spikes should not exceed the absolute maximum rating on either the BOOT or SW pins.
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bq24272 www.ti.com SLUSB09 – JUNE 2012 ELECTRICAL CHARACTERISTICS (continued) Circuit of , VUVLO < VIN < VOVP AND VIN>VBAT+VSLP, TJ = 0°C – 125°C and TJ = 25°C for typical values (unless otherwise noted) PARAMETER IDETECT Battery detection current before charge done (sink current) tDETECT Battery detection time VIH(CD) CD input high logic level VIL(CD) CD input low logic level TEST CONDITIONS MIN TYP MAX UNITS 2.5 mA 250 ms 1.3 V 0.
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bq24272 SLUSB09 – JUNE 2012 www.ti.com PIN CONFIGURATION 49-Ball WCSP (Top View) 1 2 3 4 5 6 7 A IN IN IN IN AGND AGND AGND B PMIDI PMIDI PMIDI PMIDI BYP BYP BYP C SW SW SW SW SW SW SW D PGND PGND PGND PGND PGND PGND PGND E AGND N.C. N.C. CD SDA SCL BOOT F SYS SYS SYS SYS BGATE INT DRV G BAT BAT BAT BAT TS STAT AGND PMID BOOT 19 AGND 22 20 BYP 23 21 IN CD 24 24-PIN QFN (Top View) N.C. 1 18 SW N.C.
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bq24272 www.ti.com SLUSB09 – JUNE 2012 PIN FUNCTIONS PIN NAME PIN NO. bq24272 I/O DESCRIPTION 21 I Input power supply. IN is connected to the external DC supply (AC adapter or alternate power source). Bypass IN to PGND with at least a 1μF ceramic capacitor. B1–B4 20 O Reverse Blocking MOSFET and High Side MOSFET Connection Point for High Power Input. Bypass PMID to GND with at least a 4.7μF ceramic capacitor. Use caution when connecting an external load to PMID.
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bq24272 SLUSB09 – JUNE 2012 www.ti.com TYPICAL APPLICATION CIRCUIT ADAPTER 1.5 mH SW IN PMID 0.01 mF 1 mF 4.7 mF System Load BOOT SYS 10 mF BYP PGND 1 mF BGATE DRV BAT VDRV 1 mF 1 mF STAT PACK+ TS TEMP VSYS (1.8 V) PACK- bq24272 HOST GPIO1 INT SDA SDA SCL SCL Figure 1.
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bq24272 www.ti.com SLUSB09 – JUNE 2012 DETAILED DESCRIPTION The bq24272 is a highly integrated single cell Li-Ion battery charger and system power path management devices targeted for space-limited, portable applications with high capacity batteries. The single-input, single cell charger operates from a dedicated power source (i.e. wall adapter or wireless power input).
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bq24272 SLUSB09 – JUNE 2012 www.ti.com Precharge Phase Current Regulation Phase Voltage Regulation Phase Regulation voltage Charge Current Regulation Threshold System Voltage V SYS (3.6 V) VBATSHORT (3.0 V) Battery Voltage Charge Current Termination Current Threshold I BATSHORT 50 mA Precharge to Close Pack Protector Linear Charge to Maintain Minimum System Voltage Battery FET is OFF Battery FET is ON Figure 2.
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bq24272 www.ti.com SLUSB09 – JUNE 2012 Once the battery is charged enough to where the system voltage begins to rise above VSYS(REG) (approximately 3.5V), the battery FET is turned on fully and the battery is charged with the full programmed charge current set by the I2C interface, ICHARGE. The slew rate for fast charge current is controlled to minimize the current and voltage over-shoot during transient. The charge current is regulated to ICHARGE until the battery is charged to the regulation voltage.
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bq24272 SLUSB09 – JUNE 2012 www.ti.com management (DPPM) circuitry of the bq24272 monitors the current limits continuously and if the SYS voltage falls to the VMINSYS voltage, it adjusts charge current to maintain the minimum system voltage and supply the load on SYS. If the charge current is reduced to zero and the load increases further, the bq24272 enters battery supplement mode. During supplement mode, the battery FET is turned on and the battery supplements the system load.
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bq24272 www.ti.com SLUSB09 – JUNE 2012 DEFAULT Mode DEFAULT mode is used when I2C communication is not available. DEFAULT mode is entered in the following situations: 1. When the charger is enabled and VBAT<3.6V before I2C communication is established 2. When the watchdog timer expires without a reset from the I2C interface and the safety timer has not expired. 3. When the device comes out of any fault condition (sleep mode, OVP, faulty adapter mode, etc.
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bq24272 SLUSB09 – JUNE 2012 www.ti.
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bq24272 www.ti.com SLUSB09 – JUNE 2012 2. VIN < VSLP + VBAT 3. Thermal Shutdown External NTC Monitoring (TS) The I2C interface allows the user to easily implement the JEITA standard for systems where the battery pack thermistor is monitored by the host. Additionally, the bq24272 provides a flexible, voltage based TS input for monitoring the battery pack NTC thermistor. The voltage at TS is monitored to determine that the battery is at a safe temperature during charging.
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bq24272 SLUSB09 – JUNE 2012 www.ti.com Where RHOT is the NTC resistance at the hot temperature and RCOLD is the NTC resistance at cold temperature. VDRV DISABLE TS COLD + VDRV TS HOT + RHI TS PACK+ TEMP bq24272 RLO PACK– Figure 6. TS Circuit If the TS function is not used, connect TS to DRV directly to disable the feature. Additionally, the TS function can be disabled in the I2C by writing to the EN_TS bit. When the TS is disabled, the status registers always read “Normal”.
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bq24272 www.ti.com SLUSB09 – JUNE 2012 VIN 5 V Adapter rated for 750 mA IIN VSYS IBAT ISYS Figure 7. bq24272 VIN-DPM Bad Source Detection When a source is connected to IN, the bq24272 runs a Bad Source Detection procedure to determine if the source is strong enough to provide some current to charge the battery. A current sink is turned on (75mA) for 32ms. If the source is valid after the 32ms (VBADSOURCE < VIN < VOVP), the buck converter starts up and normal operation continues.
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bq24272 SLUSB09 – JUNE 2012 www.ti.com Table 1.
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bq24272 www.ti.com SLUSB09 – JUNE 2012 EN_NOBATOP (No Battery Operation with Termination Disabled) The EN_NOBATOP bit is used to enable operation when termination is disabled and no battery is connected. This is useful for cases where the PA is connected to the BAT pin and it desired to do a GSM calibration in the factory. For this application, the TE bit (Bit 2 in Register 0x02h) should be set to a “0” to disable termination and the EN_NOBATOP should be set to a “1”.
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bq24272 SLUSB09 – JUNE 2012 www.ti.com HZ_MODE Bit (High Impedance Mode Enable) The HZ_MODE bit in the control register (0x02h) is used to disable or enable the high impedance mode. A low logic level (0) on this bit enables the IC and a high logic level (1) puts the IC in a low quiescent current state called high impedance mode. When in high impedance mode, the converter is off and the battery FET and BGATE are on. The load on SYS is supplied by the battery.
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bq24272 www.ti.
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bq24272 SLUSB09 – JUNE 2012 www.ti.com LOW_CHG Bit (Low Charge Mode Enable) The LOW_CHG bit is used to reduce the charge current from the programmed value. This feature is used by systems where battery NTC is monitored by the host and requires a reduced charge current setting or by systems that need a “preconditioning” current for low battery voltages. Write a “1” to this bit to charge at half of the programmed charge. Write a “0” to this bit to charge at the programmed charge current.
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bq24272 www.ti.com SLUSB09 – JUNE 2012 APPLICATION INFORMATION Output Inductor and Capacitor Selection Guidelines When selecting an inductor, several attributes must be examined to find the right part for the application. First, the inductance value should be selected. The bq24272 is designed to work with 1.5µH to 2.2µH inductors. The chosen value will have an effect on efficiency and package size. Due to the smaller current ripple, some efficiency gain is reached using the 2.
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bq24272 SLUSB09 – JUNE 2012 www.ti.com Sample Layout QFN I2C PART WCSP I2C PART GND GND PMID IN BOOT BYP PMID BYP SW IN BOOT PGND SW SW SYS PGND BAT SYS SYS SYS BAT Package Summary 1 2 3 4 5 6 7 A IN IN IN IN PGND PGND PGND B PMIDI PMIDI PMIDI PMIDI BYP BYP BYP C SW SW SW SW SW SW SW D PGND PGND PGND PGND PGND PGND PGND E PGND N.C. N.C.
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE MATERIALS INFORMATION www.ti.com 24-Aug-2013 TAPE AND REEL INFORMATION *All dimensions are nominal Device BQ24272RGER Package Package Pins Type Drawing VQFN RGE 24 BQ24272RGET VQFN RGE BQ24272YFFR DSBGA YFF BQ24272YFFT DSBGA YFF 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 4.25 4.25 1.15 8.0 12.0 Q2 24 250 180.0 12.4 4.25 4.25 1.15 8.0 12.0 Q2 49 3000 180.0 8.4 2.93 2.93 0.81 4.0 8.
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PACKAGE MATERIALS INFORMATION www.ti.com 24-Aug-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) BQ24272RGER VQFN RGE 24 3000 367.0 367.0 35.0 BQ24272RGET VQFN RGE 24 250 210.0 185.0 35.0 BQ24272YFFR DSBGA YFF 49 3000 182.0 182.0 17.0 BQ24272YFFT DSBGA YFF 49 250 182.0 182.0 17.
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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.