Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsPMICsPMIC - battery management Charge management LiFePO4 VQFN 24 (4x4) Surface-mount

24 23 22 21 20 19

7 8 9 10 11 12

ACN

ACP

ACDRV

STAT1

SRN

SRP

ISET 2

ACSET

GND

REGN

VCC

BATDRV

BTST

HIDRV

LODRV

TTC

STAT2

VREF

ISET1

VFB

OAT

(bq24630)

QFN-24

bq24630

www.ti.com

SLUS894A –JANUARY 2010– REVISED OCTOBER 2011

Stand-Alone Synchronous Switch-Mode Lithium Phosphate Battery Charger With System

Power Selector and Low I

Check for Samples: bq24630

FEATURES

• 24-Pin 4-mm × 4-mm QFN Package

• Energy Star Low Quiescent Current I

• 300-kHz NMOS-NMOS Synchronous Buck

Converter

– < 15-μA Off-State Battery Discharge Current

• Stand-Alone Charger Specifically for Lithium

– < 1.5-mA Off-State Input Quiescent Current

Phosphate

APPLICATIONS

• 5-V–28-V VCC Input Operating Range,

Supports 1–7 Battery Cells

• Power Tool and Portable Equipment

• High-Accuracy Voltage and Current Regulation

• Personal Digital Assistants

– ±0.5% Charge Voltage Accuracy

• Handheld Terminals

– ±3% Charge Current Accuracy

• Industrial and Medical Equipment

– ±3% Adapter Current Accuracy

• Netbook, Mobile Internet Device, and

• Integration Ultra-Mobile PC

– Automatic System Power Selection From

DESCRIPTION

Adapter or Battery

The bq24630 is a highly integrated switch-mode

– Internal Loop Compensation

battery charge controller designed specifically for

– Internal Soft Start

lithium phosphate batteries. It offers a

– Dynamic Power Management (DPM)

constant-frequency synchronous PWM controller with

high-accuracy current and voltage regulation, charge

• Safety Protection

preconditioning, termination, adapter current

– Input Overvoltage Protection

regulation, and charge status monitoring.

– Battery Thermistor Sense Suspend Charge

The bq24630 charges the battery in three phases:

at Hot/Cold and Automatically I

CHARGE

/8 at

preconditioning, constant current, and constant

Hot/Cold or Warm/Cool

voltage. Charge is terminated when the current

– Battery Detection

reaches a minimum user-selectable level. A

programmable charge timer provides a safety

– Reverse Protection Input FET

backup. The bq24630 automatically restarts the

– Programmable Safety Timer

charge cycle if the battery voltage falls below an

– Charge Overcurrent Protection

internal threshold and enters a low-quiescent-current

sleep mode when the input voltage falls below the

– Battery Short Protection

battery voltage.

– Battery Overvoltage Protection

– Thermal Shutdown

PACKAGE AND PINOUT

• Status Outputs

– Adapter Present

– Charger Operation Status

• Charge Enable Pin

• 6-V Gate Drive for Synchronous Buck

Converter

• 30-ns Driver Dead Time and 99.95% Max.

Effective Duty Cycle

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
bq24630 SLUS894A – JANUARY 2010 – REVISED OCTOBER 2011 www.ti.com Stand-Alone Synchronous Switch-Mode Lithium Phosphate Battery Charger With System Power Selector and Low Iq Check for Samples: bq24630 23 PH 24 LODRV PACKAGE AND PINOUT 22 21 20 19 18 REGN ACN 1 17 GND ACP 2 OAT (bq24630) QFN-24 ACDRV 3 CE 4 16 ACSET 15 ISET 2 14 SRP STAT1 5 13 SRN TS 6 7 8 9 10 11 12 VFB • The bq24630 charges the battery in three phases: preconditioning, constant current, and constant voltage.
PAGE 2
bq24630 SLUS894A – JANUARY 2010 – REVISED OCTOBER 2011 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. DESCRIPTION (CONTINUED) The bq24630 controls external switches to prevent battery discharge back to the input, connect the adapter to the system, and connect the battery to the system using 6-V gate drives for better system efficiency.
PAGE 3
bq24630 SLUS894A – JANUARY 2010 – REVISED OCTOBER 2011 www.ti.com ORDERING INFORMATION PART NUMBER IC MARING PACKAGE bq24630 OAT 24-Pin 4-mm × 4-mm QFN ODERING NUMBER (Tape and Reel) QUANTITY bq24630RGER 3000 bq24630RGET 250 THERMAL INFORMATION bq24630 THERMAL METRIC (1) RGE UNIT 24 PINS θJA Junction-to-ambient thermal resistance (2) θJCtop Junction-to-case (top) thermal resistance (3) (4) 43 °C/W 54.
PAGE 4
bq24630 SLUS894A – JANUARY 2010 – REVISED OCTOBER 2011 www.ti.com RECOMMENDED OPERATING CONDITIONS Voltage range VALUE UNIT –0.3 to 28 V PH –2 to 30 V VFB –0.3 to 14 V REGN, LODRV, ACSET, TS, TTC –0.3 to 6.5 V BTST, HIDRV with respect to GND –0.3 to 34 V ISET1, ISET2 –0.3 to 3.3 V 3.3 V VCC, ACP, ACN, SRP, SRN, BATDRV, ACDRV, CE, STAT1, STAT2, PG VREF Maximum difference voltage ACP–ACN, SRP–SRN –0.2 to 0.
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bq24630 SLUS894A – JANUARY 2010 – REVISED OCTOBER 2011 www.ti.
PAGE 6
bq24630 SLUS894A – JANUARY 2010 – REVISED OCTOBER 2011 www.ti.com ELECTRICAL CHARACTERISTICS (continued) 5 V ≤ VVCC ≤ 28 V, 0°C < TJ < 125°C, typical values are at TA = 25°C, with respect to GND unless otherwise noted PARAMETER TEST CONDITIONS MIN TYP MAX UNIT 32.
PAGE 7
bq24630 SLUS894A – JANUARY 2010 – REVISED OCTOBER 2011 www.ti.com ELECTRICAL CHARACTERISTICS (continued) 5 V ≤ VVCC ≤ 28 V, 0°C < TJ < 125°C, typical values are at TA = 25°C, with respect to GND unless otherwise noted PARAMETER TEST CONDITIONS MIN TYP MAX UNIT LOW CHARGE CURRENT COMPARATOR VLC Average low charge current falling threshold VLC_HYS Low charge current rising hysteresis VLC_DEG Deglitch on both edge Measure on V(SRP-SRN), forced into non-synchronous mode 1.25 mV 1.
PAGE 8
bq24630 SLUS894A – JANUARY 2010 – REVISED OCTOBER 2011 www.ti.
PAGE 9
bq24630 SLUS894A – JANUARY 2010 – REVISED OCTOBER 2011 www.ti.com TYPICAL CHARACTERISTICS Table 1.
PAGE 10
bq24630 SLUS894A – JANUARY 2010 – REVISED OCTOBER 2011 20 V/div www.ti.com LODRV PH 2 A/div 2 A/div 5 V/div 20 V/div HIDRV 5 V/div 5 V/div PH IL LODRV IL t − Time = 200 ns/div t – Time = 200 ns/div 10 V/div 2 A/div IIN PH ISYS 2 A/div LODRV IL IBAT t − Time = 200 μs/div Figure 9. Transient System Load (DPM) 20 V/div t − Time = 400 ns/div Figure 8. 100% Duty and Refresh Pulse 5 V/div 10 V/div 0.5 A/div 5 V/div Figure 7.
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bq24630 SLUS894A – JANUARY 2010 – REVISED OCTOBER 2011 www.ti.com 96 PH 94 92 Efficiency - % LDRV 2 A/div 5 V/div 20 V/div 98 10 V/div IL 90 24 Vin, 6 cell 88 24 Vin, 5 cell 86 12 Vin, 2 cell 84 12 Vin, 1 cell VBAT 82 80 t – Time = 8 μs/div 0 1 6 7 8 20 V/div 20 V/div Figure 13. Efficiency vs Output Current VCC VCC /ACDRV /ACDRV /BATDRV 2 V/div /BATDRV 2 V/div 5 4 3 IBAT - Output Current - A 20 V/div 20 V/div 20 V/div 20 V/div Figure 12.
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bq24630 SLUS894A – JANUARY 2010 – REVISED OCTOBER 2011 www.ti.com Pin Functions – 24-Pin QFN PIN NO. 12 FUNCTION DESCRIPTION NAME 1 ACN Adapter-current sense resistor, negative input. A 0.1-μF ceramic capacitor is placed from ACN to ACP to provide differential-mode filtering. An optional 0.1-μF ceramic capacitor is placed from the ACN pin to GND for common-mode filtering. 2 ACP Adapter-current sense resistor, positive input. A 0.
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bq24630 SLUS894A – JANUARY 2010 – REVISED OCTOBER 2011 www.ti.com BLOCK DIAGRAM VREF VOLTAGE REFERENCE VCC- 6 V REG VREF bq24630 VCC ACN 3.3 V LDO ACN -6 V VCC - SRN+100 mV + VCC V UVLO + ACN + SRN+200 mV - SLEEP UVLO VCC VCC- 6 V VCC- 6 V REG SLEEP - VCC UVLO SYSTEM POWER SELECTOR LOGIC ACN - SRN ACDRV VCC- 6 V ACN ACOV BATDRV CE 1M ACN - 6 V + V(ACP-ACN) 20X - + COMP ERROR AMPLIFIER - ACN CE BTST - ACSET + 1V PWM - VFB + ACP + LEVEL SHIFTER - 1.
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bq24630 SLUS894A – JANUARY 2010 – REVISED OCTOBER 2011 www.ti.
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bq24630 SLUS894A – JANUARY 2010 – REVISED OCTOBER 2011 www.ti.com DETAILED DESCRIPTION Regulation Voltage VRECH Regulation Current Fastcharge Current Regulation Phase Precharge Current Regulation Phase Fastcharge Voltage Regulation Phase Termination Charge Current Charge Voltage VLOWV IPRECH & ITERM Precharge Time Fastcharge Safety Time Figure 17.
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bq24630 SLUS894A – JANUARY 2010 – REVISED OCTOBER 2011 www.ti.com PRECHARGE On powerup, if the battery voltage is below the VLOWV threshold, the bq24630 applies 125 mA precharge current to the battery (1). The precharge feature is intended to revive deeply discharged cells. If the VLOWV threshold is not reached within 30 minutes of initiating precharge, the charger turns off and a FAULT is indicated on the status pins.
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bq24630 SLUS894A – JANUARY 2010 – REVISED OCTOBER 2011 www.ti.com If VCC is below the UVLO threshold, the device is disabled, ACFET turns off ,and BATFET turns on. ENABLE AND DISABLE CHARGING The following conditions must be valid before charge is enabled: • CE is HIGH. • The device is not in undervoltage lockout (UVLO) and not in VCCLOWV mode. • The device is not in SLEEP mode. • The VCC voltage is lower than the ac overvoltage threshold (VCC < VACOV). • 30-ms delay is complete after initial power up.
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bq24630 SLUS894A – JANUARY 2010 – REVISED OCTOBER 2011 www.ti.com AUTOMATIC INTERNAL SOFT-START CHARGER CURRENT The charger automatically soft-starts the charger regulation current every time the charger goes into fast-charge 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 in eight evenly divided steps up to the programmed charge current. Each step lasts around 1.
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bq24630 SLUS894A – JANUARY 2010 – REVISED OCTOBER 2011 www.ti.com At very low currents during non-synchronous operation, there may be a small amount of negative inductor current during the 80-ns recharge pulse. The charge should be low enough to be absorbed by the input capacitance. Whenever the converter goes into zero-percent duty cycle, the high-side MOSFET does not turn on, and the low-side MOSFET does not turn on (only 80-ns recharge pulse) either, and there is almost no discharge from the battery.
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bq24630 SLUS894A – JANUARY 2010 – REVISED OCTOBER 2011 www.ti.com within the VLTF to VTCO thresholds. If the battery temperature is outside of this range, the controller suspends charge and the safety timer, and waits until the battery temperature is within the VLTF to VHTF range. If the battery temperature is between the VLTF and VCOOL thresholds or between the VHTF and VWARM thresholds, charge is automatically reduced to ICHARGE/8.
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bq24630 SLUS894A – JANUARY 2010 – REVISED OCTOBER 2011 www.ti.com æ 1 ö 1 VVREF ´ RTHCOOL ´ RTHWARM ´ ç ÷ V V WARM ø è COOL RT2 = æV ö æ V ö RTHWARM ´ ç VREF - 1÷ - RTHCOOL ´ ç VREF - 1÷ è VWARM ø è VCOOL ø (7) VVREF -1 VCOOL RT1 = 1 1 + RT2 RTHCOOL (8) VREF bq24630 RT1 TS RT2 RTH 103 AT Figure 20. TS Resistor Network For example, a 103AT NTC thermistor is used to monitor the battery pack temperature. Select TCOOL = 0ºC, TWARM = 60ºC. From the calculation and select standard 5% resistor value.
PAGE 22
bq24630 SLUS894A – JANUARY 2010 – REVISED OCTOBER 2011 www.ti.com CE (Charge Enable) The CE digital input is used to disable or enable the charge process. A high-level signal on this pin enables charge, provided all the other conditions for charge are met (see ENABLE AND DISABLE CHARGING, Enable and Disable Charging). A high-to-low transition on this pin also resets all timers and fault conditions. There is an internal 1-MΩ pulldown resistor on the CE pin, so if CE is floated the charge does not turn on.
PAGE 23
bq24630 SLUS894A – JANUARY 2010 – REVISED OCTOBER 2011 www.ti.com BATTERY DETECTION For applications with removable battery packs, the bq24630 provides a battery-absent detection scheme to reliably detect the insertion or removal of battery packs.
PAGE 24
bq24630 SLUS894A – JANUARY 2010 – REVISED OCTOBER 2011 www.ti.com Once the device has powered up, an 8-mA discharge current is applied to the SRN terminal. If the battery voltage falls below the LOWV threshold within 1 second, the discharge source is turned off, and the charger is turned on at low charge current (125 mA). If the battery voltage rises above the recharge threshold within 500 ms, there is no battery present and the cycle restarts.
PAGE 25
bq24630 SLUS894A – JANUARY 2010 – REVISED OCTOBER 2011 www.ti.com Component List for Typical System Circuit of Figure 1 PART DESIGNATOR QTY DESCRIPTION Q1, Q2, Q3 3 P-channel MOSFET, –30 V, –35 A, PowerPAK 1212-8, Vishay-Siliconix, Si7617DN Q4, Q5 2 N-channel MOSFET, 30 V, 12 A, PowerPAK 1212-8, Vishay-Siliconix, Sis412DN D1 1 Diode, dual Schottky, 30 V, 200 mA, SOT23, Fairchild, BAT54C D2, D3, D4 3 LED diode, green, 2.
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bq24630 SLUS894A – JANUARY 2010 – REVISED OCTOBER 2011 www.ti.com APPLICATION INFORMATION Inductor Selection The bq24630 has 300-kHz switching frequency to allow the use of small inductor and capacitor values.
PAGE 27
bq24630 SLUS894A – JANUARY 2010 – REVISED OCTOBER 2011 www.ti.com Power MOSFET Selection Two external N-channel MOSFETs are used for a synchronous switching battery charger. The gate drivers are internally integrated into the IC with 6 V of gate drive voltage. 30-V or higher voltage rating MOSFETs are preferred for a 20-V input voltage and 40-V MOSFETs are prefered for 20-V to 28-V input voltage.
PAGE 28
bq24630 SLUS894A – JANUARY 2010 – REVISED OCTOBER 2011 www.ti.com PVREF = (VIN - VVREF ) × IVREF PICLOSS = PICLOSS _ driver + PVREF + PQuiescent (24) Input Filter Design During adapter hot plug-in, the parasitic inductance and input capacitor from the adapter cable form a second-order system. The voltage spike at the VCC pin may be beyond the IC maximum voltage rating and damage the IC. The input filter must be carefully designed and tested to prevent an overvoltage event on the VCC pin.
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bq24630 SLUS894A – JANUARY 2010 – REVISED OCTOBER 2011 www.ti.com 7. Route the analog ground separately from the power ground and use a single ground connection to tie the charger power ground to the charger analog ground. Just beneath the IC, use the copper pour for analog ground, but avoid power pins to reduce inductive and capacitive noise coupling. Connect the analog ground to GND. Connect the analog ground and power ground together using the power pad as the single ground connection point.
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PACKAGE OPTION ADDENDUM www.ti.
PAGE 31
PACKAGE MATERIALS INFORMATION www.ti.com 26-Jan-2013 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 BQ24630RGER VQFN RGE 24 3000 330.0 12.4 4.25 4.25 1.15 8.0 12.0 Q2 BQ24630RGER VQFN RGE 24 3000 330.0 12.4 4.25 4.25 1.15 8.0 12.0 Q2 BQ24630RGET VQFN RGE 24 250 180.0 12.4 4.25 4.25 1.15 8.0 12.
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PACKAGE MATERIALS INFORMATION www.ti.com 26-Jan-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) BQ24630RGER VQFN RGE 24 3000 367.0 367.0 35.0 BQ24630RGER VQFN RGE 24 3000 367.0 367.0 35.0 BQ24630RGET VQFN RGE 24 250 210.0 185.0 35.0 BQ24630RGET VQFN RGE 24 250 210.0 185.0 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.