Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsPMICsPMIC - battery management Charge management, Power management Multi-Chemistry TSSOP 24 Surfa

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 

FEATURES

DESCRIPTION

ACDET

ACPRES

ACSEL

BATDEP

SRSET

ACSET

VREF

ENABLE

BATSET

COMP

ACN

ACP

ACDRV

BATDRV

VCC

PWM

VHSP

ALARM

GND

SRP

SRN

IBAT

BATP

bq24702, bq24703

PW PACKAGE

(TOP VIEW)

ACSEL

ACPRES

ACDET

ACDRV

BATDRV

VCC

ACN

ACP

BATP

IBAT

BATDEP

SRSET

ACSET

VREF

ENABLE

BATSET

COMP

PWM

VHSP

ALARM

GND

SRP

SRN

bq24703

RHD PACKAGE

(BOTTOM VIEW)

NC - No internal connection

bq24702

bq24703

SLUS553E – MAY 2003 – REVISED OCTOBER 2007

www.ti.com

MULTICHEMISTRY BATTERY CHARGER CONTROLLER AND

SYSTEM POWER SELECTOR

• Dynamic Power Management, DPM Minimizes

Battery Charge Time

The bq24702/bq24703 is a highly integrated battery

charge controller and selector tailored for notebook

• Integrated Selector Supports Battery

and sub-notebook PC applications.

Conditioning and Smart Battery Learn Cycle

• Zero Volt Operation

The bq24702/bq24703 uses dynamic power

management (DPM) to minimize battery charge time

• Selector Feedback Circuit Ensures

by maximizing use of available wall-adapter power.

Break-Before-Make Transition

This is achieved by dynamically adjusting the battery

• ± 0.4% Charge Voltage Accuracy, Suitable for

charge current based on the total system (adapter)

Charging Li-Ion Cells

current.

• ± 4% Charge Current Accuracy

The bq24702/bq24703 uses a fixed frequency, pulse

• 300-kHz Integrated PWM Controller for

width modulator (PWM) to accurately control battery

High-Efficiency Buck Regulation

charge current and voltage. Charge current limits can

be programmed from a keyboard controller DAC or

• Depleted Battery Detection and Indication to

by external resistor dividers from the precision 5-V,

Protect Battery From Over Discharge

± 0.6%, externally bypassed voltage reference

• 20- μ A Sleep Mode Current for Low Battery

(VREF), supplied by the bq24702/bq24703.

Drain

• 24-Pin TSSOP Package and 5 mm × 5 mm QFN

package (bq24703 only)

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 (36 pages)

PAGE 1
bq24702 bq24703 www.ti.
PAGE 2
bq24702 bq24703 www.ti.com SLUS553E – MAY 2003 – REVISED OCTOBER 2007 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. DESCRIPTION (CONTINUED) The battery voltage limit can be programmed by using the internal 1.196-V, ±0.5% precision reference, making it suitable for the critical charging demands of lithium-ion cells.
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bq24702 bq24703 www.ti.com SLUS553E – MAY 2003 – REVISED OCTOBER 2007 AVAILABLE OPTIONS SELECTOR OPERATION CONDITION 20°C ≤ TJ ≤ 125°C bq24702PW bq24703RHD BATTERY AS POWER SOURCE Battery removal Automatically selects ac + alarm Automatically selects ac + alarm Battery reinserted Selection based on selector inputs Adapter latched until adapter is removed or ac select toggles.
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bq24702 bq24703 www.ti.com SLUS553E – MAY 2003 – REVISED OCTOBER 2007 RECOMMENDED OPERATING CONDITIONS (TA = TOPR) all voltages relative to VSS MIN MAX 7 28 4.
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bq24702 bq24703 www.ti.com SLUS553E – MAY 2003 – REVISED OCTOBER 2007 ELECTRICAL CHARACTERISTICS –40°C ≤ TJ ≤ 125°C, 7 VDC ≤ VCC ≤ 28 VDC, all voltages relative to VSS (unless otherwise specified) PARAMETER TEST CONDITIONS MIN TYP MAX UNIT 1 1.6 6 mA 22 28 μA 0.4 V 0.
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bq24702 bq24703 www.ti.
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bq24702 bq24703 www.ti.com SLUS553E – MAY 2003 – REVISED OCTOBER 2007 ELECTRICAL CHARACTERISTICS (Continued) –40°C ≤ TJ ≤ 125°C, 7 VDC ≤ VCC ≤ 28 VDC, all voltages relative to VSS, (unless otherwise specified) PARAMETER TEST CONDITIONS MIN TYP MAX UNIT 75 130 175 mA/V ADAPTER CURRENT-SENSE AMPLIFIER gm Transconductance gain CMRR Common-mode rejection ratio VICR Common-mode input voltage range (ACP) I(SINK) Sink current (COMP) COMP = 1 V, (ACP – ACN) = 10 mV 0.
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bq24702 bq24703 www.ti.
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bq24702 bq24703 www.ti.
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Submit Documentation Feedback Product Folder Link(s): bq24702 bq24703 R10 Note1 VS 18 BATDRV 23 BATP 13 C10 180pF C5 4.7 µF Connect to GND to Disable C4 150pF R16 100 Ω C7 4.7 µF 35 V U3 SI4435DY R28 Note1 D5 Note 1 R19 Note1 D4 MBRD640CTT4 L1 33 µH BAS16 R23 Note1 604 kΩ R27 R25 Note1 R24 604 kΩ C11 22 µF Note1 35 V R22 604 kΩ R26 100K D9 D6 Note 1 C8 Note1 R21 Note1 R20 0.
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bq24702 bq24703 www.ti.com SLUS553E – MAY 2003 – REVISED OCTOBER 2007 BLOCK DIAGRAM VHSP VCC 20 22 VREF 7 VREF ACPRES VHSP REGULATOR 2 VOLTAGE REFERENCE ACPRES ACPRES HYST ACDET 1 + VCC 300 kHz S Q R Q 2V VACPRES OSC PWM LOGIC LEVEL SHIFT HIGH-SIDE DRIVE 21 PWM 13 BATP + VHSP ACSEL 3 ENABLE 8 5V 100 µ A BATDA BATTERY VOLTAGE ERROR AMPLIFIER COMP Zero Volt Charging 5V 10 9 VCC 2 kΩ ACP + VTBD 12 + + + BATSET 0.
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bq24702 bq24703 www.ti.com SLUS553E – MAY 2003 – REVISED OCTOBER 2007 Table 1.
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bq24702 bq24703 www.ti.com SLUS553E – MAY 2003 – REVISED OCTOBER 2007 ALARM: Depleted battery alarm output. This open-drain pin indicates that a depleted battery condition exists. A pullup on ALARM goes high when the voltage on the BATDEP pin is below VACPRES. On the bq24702, the ALARM output also activates when the selector inputs do not match the selector state. BATDEP: Depleted battery level.
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bq24702 bq24703 www.ti.com SLUS553E – MAY 2003 – REVISED OCTOBER 2007 APPLICATION INFORMATION PROGRAMMING THE THRESHOLDS The input-referenced thresholds for battery depleted, ac detection and charge voltage are defined by dimensioning the external dividers connected to pins BATDEP, ACDET and BATP.
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bq24702 bq24703 www.ti.com SLUS553E – MAY 2003 – REVISED OCTOBER 2007 ADAPTER CURRENT LIMIT ADAPTER CURRENT SYSTEM CURRENT BATTERY CHARGE CURRENT NO CHARGE MAXIMUM CHARGE CURRENT DYNAMIC POWER MANAGEMENT MAXIMUM CHARGE CURRENT UDG-00113 Figure 1. Dynamic Power Management ACDET OPERATION The ACDET function senses the loss of adequate adapter power.
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bq24702 bq24703 www.ti.com SLUS553E – MAY 2003 – REVISED OCTOBER 2007 ZERO VOLT OPERATING The zero volt operation is intended to provide a low current path to close open packs and protect the system in the event of a pack cell short-circuit condition or if a short is applied to the pack terminal. It is not designed to precharge depleted packs, as it is disabled at voltages that are not within normal pack operating range for precharge.
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bq24702 bq24703 www.ti.com SLUS553E – MAY 2003 – REVISED OCTOBER 2007 SOFTSTART Softstart is provided to ensure an orderly start-up when the PWM is enabled. When the PWM controller is disabled (ENABLE = Low), the 100-μA current source pullup is disabled and the COMP pin is actively pulled down to GND. Disabling the 100-μA pullup reduces current drain when the PWM is disabled.
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bq24702 bq24703 www.ti.com SLUS553E – MAY 2003 – REVISED OCTOBER 2007 The overall accuracy of the battery charge regulation voltage is a function of the bypassed 5-V reference voltage tolerance as well as the tolerances on R1 and R2. The precision voltage reference has a 0.5% tolerance making it suitable for the tight battery voltage requirements of Li-ion batteries. Tolerance resistors of 0.1% are recommended for R1 and R2 as well as any resistors used to set BATSET.
PAGE 19
bq24702 bq24703 www.ti.com SLUS553E – MAY 2003 – REVISED OCTOBER 2007 PROGRAMMING THE BATTERY CHARGE CURRENT The battery charge current is programmed via a voltage on the SRSET pin. This voltage can be derived from a resistor divider from the 5-V VREF or by means of an DAC. The voltage is converted to a current source that is used to develop a voltage drop across an internal offset resistor at one input of the SR gmamplifier.
PAGE 20
bq24702 bq24703 www.ti.com SLUS553E – MAY 2003 – REVISED OCTOBER 2007 COMPONENT SELECTION MOSFET Selection MOSFET selection depends on several factors, namely, gate-source voltage, input voltage, and input current. The MOSFET must be a P-channel device capable of handling at least 15-V gate-to-source with a drain-source breakdown of VBV~ VIN+1 V.
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bq24702 bq24703 www.ti.com SLUS553E – MAY 2003 – REVISED OCTOBER 2007 Selecting an Output Capacitor For this application the output capacitor is used primarily to shunt the output ripple current away from the battery. The output capacitor should be sized to handle the full output ripple current as defined as: I c (RMS) + ǒVIN * VBATǓ F D A L S RMS (8) Selecting an Input Capacitor The input capacitor is used to shunt the converter ripple current on the input lines.
PAGE 22
bq24702 bq24703 www.ti.com SLUS553E – MAY 2003 – REVISED OCTOBER 2007 ADAPTER SELECT SWITCH ADAPTER INPUT SYSTEM LOAD (bq24702) PWM BATTERY CHARGER BAT ACDRV (bq24702) 24 BATTERY SELECTOR BATDRV CONTROL 23 BATTERY SELECT SWITCH UDG-00119 Figure 6. Selector Control Switches AUTONOMOUS SELECTION OPERATION Adapter voltage information is sensed at the ACDET pin via a resistor divider from the adapter input. The voltage on the ACDET pin is compared to an internally fixed threshold.
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bq24702 bq24703 www.ti.com SLUS553E – MAY 2003 – REVISED OCTOBER 2007 SMART LEARN CYCLES WHEN ADAPTER POWER IS PRESENT Smart learn cycles can be conducted when adapter power is present by asserting and maintaining the ACSEL pin low. The adapter power can be reselected at the end of the learn cycle by a setting ACSEL to a logic high, provided that adapter power is present. Battery charging is suspended while selected as the system power source.
PAGE 24
bq24702 bq24703 www.ti.com SLUS553E – MAY 2003 – REVISED OCTOBER 2007 SELECTOR/ALARM TIMING EXAMPLE The selector and ALARM timing example in Figure 7 illustrates the battery conditioning support. NOTE: For manual selection of wall power as the main power source, both the ACPRES and ACSEL signals must be a logic high.
PAGE 25
bq24702 bq24703 www.ti.com SLUS553E – MAY 2003 – REVISED OCTOBER 2007 PWM SELECTOR SWITCH GATE DRIVE Because the external P-channel MOSFETs (as well as the internal MOSFETs) have a maximum gate-source voltage limitation of the input voltage, VCC, cannot be used directly to drive the MOSFET gate under all input conditions. To provide safe MOSFET-gate-drive at input voltages of less than an intermediate gate drive voltage rail was established (VSHP). Where VHSP = VCC – 10 V.
PAGE 26
bq24702 bq24703 www.ti.com SLUS553E – MAY 2003 – REVISED OCTOBER 2007 TYPICAL CHARACTERISTICS ERROR AMPLIFIER REFERENCE vs JUNCTION TEMPERATURE BYPASSED 5-V REFERENCE vs JUNCTION TEMPERATURE 5.1 1.215 5.08 1.21 1.205 1.2 1.195 1.19 1.185 5.04 5.02 5 4.98 4.96 4.94 1.18 4.92 1.175 −40 10 60 TJ − Junction Temperature − _C 4.9 −40 110 125 10 60 TJ − Junction Temperature − _C Figure 8. Figure 9.
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bq24702 bq24703 www.ti.com SLUS553E – MAY 2003 – REVISED OCTOBER 2007 TYPICAL CHARACTERISTICS (continued) BATTERY CURRENT SET ACCURACY vs BATTERY CURRENT SET VOLTAGE AC CURRENT SET ACCURACY vs AC CURRENT SET VOLTAGE 25 20 SRSET Full Scale = 2.5 V = Max Programmed Current TJ = 25°C AC Current Set Accuracy − % Battery Current Set Accuracy − % 25 15 10 20 ACSET Full Scale = 2.5 V = Max Programmed Current TJ = 25°C 15 10 5 5 0 0.25 0.5 0.75 1 1.25 1.5 1.75 2 2.25 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 BQ24702PWR TSSOP BQ24703PWR BQ24703RHDR SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant PW 24 2000 330.0 16.4 6.95 8.3 1.6 8.0 16.0 Q1 TSSOP PW 24 2000 330.0 16.4 6.95 8.3 1.6 8.0 16.0 Q1 VQFN RHD 28 3000 330.0 12.4 5.3 5.3 1.5 8.0 12.
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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) BQ24702PWR TSSOP PW 24 2000 367.0 367.0 38.0 BQ24703PWR TSSOP PW 24 2000 367.0 367.0 38.0 BQ24703RHDR VQFN RHD 28 3000 367.0 367.0 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 JESD46C and to discontinue any product or service per JESD48B. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.