Datasheet

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bq28400

www.ti.com

SLUSA61A –OCTOBER 2010–REVISED DECEMBER 2010

Tablet PC and Netbook 2-Series Cell Li-Ion Battery Gas Gauge and Protection

Check for Samples: bq28400

FEATURES

• Reduced Power Modes (Typical Battery Pack

Operating Range Conditions)

• Fully Integrated Gas Gauge and Analog

Monitoring with Protection in a Single Package – Low Power

• 2-Series Cell Li-Ion or Li-Polymer Battery – Shutdown

Packs

• 20-Pin TSSOP Package (RoHS-Compliant)

• Flexible Memory Architecture with Integrated

• JEITA/Enhanced Charging

Flash Memory

• Supports SHA-1 Authentication Responder

• Zero-Volt and Pre-Charge Mode

• Full Array of Programmable Protection: APPLICATIONS

• Tablet PCs

– OV (Overvoltage)

• Slate PCs

– UV (Undervoltage)

• Netbooks/Notebooks

– SC (Short Circuit)

• Smartbooks

– OT (Overtemperature)

– CIM (Cell Imbalance)

DESCRIPTION

• Accurate CEDV Gauging Algorithm with Self

The bq28400 device is a fully integrated gas gauge

Discharge Compensation

and analog monitoring management solution that

• High Accuracy Analog Interface with Two

provides protection and control for 2-series cell Li-Ion

Independent ADCs:

battery packs in a single TSSOP package.

– High Resolution 16-Bit Integrator for

Implementing the optimum balance of quick response

Coulomb Counting

analog hardware-based monitoring and control along

– 16-Bit Delta-Sigma ADC with a 16-Channel

with an integrated fast CPU provides the ideal

Multiplexer for Voltage, Current, and pack-based or in-system Li-Ion battery solution. The

bq28400 also provides flexible user programmable

Temperature

settings stored in flash memory for control of critical

• High Side Protection FET Drive

system parameters such as overcurrent, short circuit,

• Fully Integrated Internal Clock Synthesizer

under/overvoltage, and over/undertemperature

with No External Components Required

conditions.

• Two-Wire SMBus v1.1 Compliant

The bq28400 communicates with the system host via

Communications

a two-wire SMBus 1.1 compatible interface, providing

high-accuracy reporting and control of battery pack

operation. The FET drive and TSSOP package

enable a lower cost and small footprint solution along

with a simple layout and routing on narrow pack

PCBs.

AVAILABLE OPTIONS

PACKAGE

(1)

20-PIN TSSOP (PW) Tube 20-PIN TSSOP (PW) Tape and Reel

–40°C to 85°C bq28400PW

(2)

bq28400PWR

(3)

(1) 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) A single tube quantity is 50 units.

(3) A single reel quantity is 2000 units.

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 (24 pages)

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bq28400 www.ti.
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bq28400 SLUSA61A – OCTOBER 2010 – REVISED DECEMBER 2010 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.
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bq28400 www.ti.com SLUSA61A – OCTOBER 2010 – REVISED DECEMBER 2010 bq28400 PW PACKAGE (TOP VIEW) BAT 1 20 PACK DSG 2 19 CHG VC1 3 18 ZVCHG VC2 4 17 FUSE VSS 5 16 REG27 SRP 6 15 VSS SRN 7 14 RBI TS1 8 13 PRES CB_EN 9 12 SMBC SMBD 10 11 NC PIN FUNCTIONS (1) PIN NAME PIN NUMBER TYPE (1) BAT 1 P Alternate supply input DSG 2 O P-channel discharge FET gate drive VC1 3 AI Sense input for the most positive cell.
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bq28400 SLUSA61A – OCTOBER 2010 – REVISED DECEMBER 2010 www.ti.com THERMAL INFORMATION bq28400 THERMAL METRIC (1) PW UNITS 20 PINS Junction-to-ambient thermal resistance (2) qJA 91.7 (3) qJC(top) Junction-to-case(top) thermal resistance qJB Junction-to-board thermal resistance yJT Junction-to-top characterization parameter yJB Junction-to-board characterization parameter qJC(bottom) (1) (2) (3) (4) (5) (6) (7) 20.4 (4) 45.6 (5) Junction-to-case(bottom) thermal resistance °C/W 0.
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bq28400 www.ti.com SLUSA61A – OCTOBER 2010 – REVISED DECEMBER 2010 RECOMMENDED OPERATING CONDITIONS over operating free-air temperature range (unless otherwise noted) PIN Supply voltage V(STARTUP) BAT Minimum startup voltage VIN MIN NOM MAX PACK Input Voltage Range 3.8 VVC2 + 5 Start up voltage at PACK 5.5 V VVC2 VVC2 + 5 V VC2 VVSRP VVSRP + 5 V VC1 – VC2 5.2 SRP to SRN External 2.
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bq28400 SLUSA61A – OCTOBER 2010 – REVISED DECEMBER 2010 www.ti.com ELECTRICAL CHARACTERISTICS (continued) Typical values stated where TA = 25ºC and VBAT = VPACK = 7.2 V, Min/Max values stated where TA = –20ºC to 85ºC and VBAT = VPACK = 3.8 V to 18.
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bq28400 www.ti.com SLUSA61A – OCTOBER 2010 – REVISED DECEMBER 2010 ELECTRICAL CHARACTERISTICS (continued) Typical values stated where TA = 25ºC and VBAT = VPACK = 7.2 V, Min/Max values stated where TA = –20ºC to 85ºC and VBAT = VPACK = 3.8 V to 18.75 V over operating free-air temperature range (unless otherwise noted) TEST CONDITION (1) PARAMETER MIN TYP MAX VWAKE = 1.2 mV 0.2 1.2 2 VWAKE = 2.4 mV 0.4 2.4 3.6 VWAKE = 5 mV 2 5 6.8 VWAKE = 10 mV 5.
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bq28400 SLUSA61A – OCTOBER 2010 – REVISED DECEMBER 2010 www.ti.com ELECTRICAL CHARACTERISTICS (continued) Typical values stated where TA = 25ºC and VBAT = VPACK = 7.2 V, Min/Max values stated where TA = –20ºC to 85ºC and VBAT = VPACK = 3.8 V to 18.
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bq28400 www.ti.com SLUSA61A – OCTOBER 2010 – REVISED DECEMBER 2010 ELECTRICAL CHARACTERISTICS (continued) Typical values stated where TA = 25ºC and VBAT = VPACK = 7.2 V, Min/Max values stated where TA = –20ºC to 85ºC and VBAT = VPACK = 3.8 V to 18.75 V over operating free-air temperature range (unless otherwise noted) TEST CONDITION (1) PARAMETER MIN TYP MAX UNIT 9 9.5 10 V VBAT – 0.
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bq28400 SLUSA61A – OCTOBER 2010 – REVISED DECEMBER 2010 www.ti.
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bq28400 www.ti.com SLUSA61A – OCTOBER 2010 – REVISED DECEMBER 2010 BAT PACK BAT 2 KW FUSE PACK REF + - REG27 1 KW ESD 7.5 V 10 KW 1 KW REG27 FUSE PACK PACK REG27 CHG 1.
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bq28400 SLUSA61A – OCTOBER 2010 – REVISED DECEMBER 2010 www.ti.com TIMING CIRCUITS tr t SU(STO) tf tf tHD(STA) tBUF t HIGH SMBC SMBC SMBD SMBD P tr S t LOW tHD(DAT) Start and Stop Condition t SU(DAT) Wait and Hold Condition tSU(STA) t TIMEOUT SMBC SMBC SMBD SMBD S Timeout Condition Repeated Start Condition Figure 1. Timing Conditions GENERAL OVERVIEW The bq28400 has a flexible architecture that enables development of numerous battery-management solutions.
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bq28400 www.ti.com SLUSA61A – OCTOBER 2010 – REVISED DECEMBER 2010 FEATURE SET Safety Features The bq28400 supports a wide range of battery and system protection features that can be configured.
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bq28400 SLUSA61A – OCTOBER 2010 – REVISED DECEMBER 2010 • www.ti.com or SMBus activity detected. In Shutdown Mode, the bq28400 is completely disabled by turning off all FETs and powering down the bq28400. CONFIGURATION Oscillator Function The bq28400 fully integrates the system oscillator; therefore, no external components are required for this feature. System Present Operation The device checks the PRES pin periodically.
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bq28400 www.ti.com SLUSA61A – OCTOBER 2010 – REVISED DECEMBER 2010 Current The bq28400 uses the SRP and SRN inputs to measure and calculate the battery charge and discharge current using a 5-mΩ to 20-mΩ typical sense resistor. Temperature The bq28400 has an internal temperature sensor and input pin for an external temperature sensor. The bq28400 can be configured to use either the internal or external temperature sensor.
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bq28400 SLUSA61A – OCTOBER 2010 – REVISED DECEMBER 2010 www.ti.com COMMUNICATIONS The bq28400 uses SMBus v1.1 in Slave Mode per the SBS specification. SBS Commands Table 1. SBS COMMANDS SBS Command Mode Format Min Value Max Value Default Value 0x00 R/W ManufacturerAccess H2 0x0000 0xffff — 0x03 0x08 R/W BatteryMode H2 0x0000 0xe383 — R Temperature U2 0 65535 — 0.
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bq28400 www.ti.com SLUSA61A – OCTOBER 2010 – REVISED DECEMBER 2010 APPLICATION INFORMATION Run Time to Empty To predict how much run time the battery pack can supply to the host system, a “Run Time To Empty” value can be calculated.
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bq28400 SLUSA61A – OCTOBER 2010 – REVISED DECEMBER 2010 www.ti.com Cell Balancing Cell balancing increases the useful life of battery packs. Cell-to-cell differences in self-discharge, capacity, and impedance can lead to different charge states among the cells; however, the charger terminates the charge based on the summed voltage only, which may leave some cells undercharged and others overcharged.
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bq28400 www.ti.com SLUSA61A – OCTOBER 2010 – REVISED DECEMBER 2010 CHG FET DSG FET PACK+ CHG 1 KW DSG VC1 0.1 µ F Q1 Cell 1 100 W 1 KW VC2 0.1 µ F Q2 Cell 2 100 W VSS NOTE: Q1 and Q2 are Si1023 type P-CH FETs Figure 3. Internal Cell Balancing Control Circuit PACK + Fuse FUSE DSG ZVCHG PRES CHG TS1 RB1 VSS REG27 PACK 1k 220 k BAT 1k OUT VC2 VC1 SMBD 0.1 µF 1k SMBC bq29200 VDD VC1 bq28400 0.1 µF VC2 0.1 µF CB_EN VC1_CB VSS 360 CD GND 0.
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bq28400 www.ti.com 1 SLUSA61A – OCTOBER 2010 – REVISED DECEMBER 2010 Figure 5.
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PACKAGE OPTION ADDENDUM www.ti.
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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.