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OAQ

(bq24600)

QFN-16

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bq24600

www.ti.com

SLUS891A –FEBRUARY 2010– REVISED OCTOBER 2011

Stand-Alone Synchronous Switch-Mode Li-Ion or Li-Polymer Battery Charger with Low I

Check for Samples: bq24600

FEATURES

APPLICATIONS

• 1.2-MHz NMOS-NMOS Synchronous Buck • Netbook, Mobile Internet Device, and

Converter Ultra-Mobile PC

• Stand-Alone Charger Support for Li-Ion or • Personal Digital Assistants

Li-Polymer

• Handheld Terminals

• 5-V–28-V VCC Input Voltage Range and

• Industrial and Medical Equipment

Supports 1-6 Battery Cells

• Portable Equipment

• Up to 10-A Charge Current and Adapter

Current

DESCRIPTION

• High-Accuracy Voltage and Current Regulation

The bq24600 is a highly integrated Li-ion or

Li-polymer switch-mode battery-charge controller. It

– ±0.5% Charge-Voltage Accuracy

offers a constant-frequency synchronous PWM

– ±3% Charge-Current Accuracy

controller with high-accuracy charge current and

• Integration

voltage regulation, charge preconditioning,

termination, and charge status monitoring,

– Internal Loop Compensation

– Internal Soft Start

The bq24600 charges the battery in three phases:

preconditioning, constant current, and constant

• Safety

voltage. Charge is terminated when the current

– Input Overvoltage Protection

reaches a minimum level. An internal charge timer

– Battery Thermistor Sense Hot/Cold Charge

provides a safety backup. The bq24600 automatically

Suspend

restarts the charge cycle if the battery voltage falls

below an internal threshold, and enters a

– Battery Detection

low-quiescent-current sleep mode when the input

– Built-In Safety Timer

voltage falls below the battery voltage.

– Charge Overcurrent Protection

PACKAGE AND PIN-OUT

– Battery Short Protection

– Battery Overvoltage Protection

– Thermal Shutdown

• Status Outputs

– Adapter Present

– Charger Operation Status

• Charge Enable Pin

• 6-V Gate Drive for Synchronous Power

Converter

• 30-ns Driver Dead-Time and 99.5% Max.

Effective Duty Cycle

• 16-Pin 3.5-mm × 3.5-mm QFN package

• Energy Star Low Quiescent Current I

– < 15-μA Off-State Battery Discharge Current

– < 1.5-mA Off-State Input Quiescent Current

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 (34 pages)

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bq24600 SLUS891A – FEBRUARY 2010 – REVISED OCTOBER 2011 www.ti.com Stand-Alone Synchronous Switch-Mode Li-Ion or Li-Polymer Battery Charger with Low Iq Check for Samples: bq24600 FEATURES APPLICATIONS • • • • • • • • • • • • • • 1.2-MHz NMOS-NMOS Synchronous Buck Converter Stand-Alone Charger Support for Li-Ion or Li-Polymer 5-V–28-V VCC Input Voltage Range and Supports 1-6 Battery Cells Up to 10-A Charge Current and Adapter Current High-Accuracy Voltage and Current Regulation – ±0.
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bq24600 SLUS891A – FEBRUARY 2010 – REVISED OCTOBER 2011 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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bq24600 SLUS891A – FEBRUARY 2010 – REVISED OCTOBER 2011 www.ti.com THERMAL INFORMATION bq24600 THERMAL METRIC (1) RVA UNIT 16 PINS Junction-to-ambient thermal resistance (2) θJA (3) 43.8 °C/W θJCtop Junction-to-case (top) thermal resistance 81 °C/W θJB Junction-to-board thermal resistance (4) 16 °C/W ψJT Junction-to-top characterization parameter (5) 0.6 °C/W 15.
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bq24600 SLUS891A – FEBRUARY 2010 – REVISED OCTOBER 2011 www.ti.com RECOMMENDED OPERATING CONDITIONS VALUE UNIT –0.3 to 28 V PH –2 to 30 V VFB –0.3 to 14 V REGN, LODRV, TS –0.3 to 6.5 V BTST, HIDRV with respect to GND –0.3 to 34 V ISET –0.3 to 3.3 V VCC, SRP, SRN, CE, STAT, PG Voltage range VREF 3.3 V –0.2 to 0.
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bq24600 SLUS891A – FEBRUARY 2010 – REVISED OCTOBER 2011 www.ti.
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bq24600 SLUS891A – FEBRUARY 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 35 50 65 UNIT RECHARGE COMPARATOR VRECHG Recharge threshold (with respect to.
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bq24600 SLUS891A – FEBRUARY 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 6.0 6.3 UNIT REGN REGULATOR VREGN_REG REGN regulator voltage VVCC > 10 V, CE = HIGH (0 - 40 mA load) 5.
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bq24600 SLUS891A – FEBRUARY 2010 – REVISED OCTOBER 2011 www.ti.com TYPICAL CHARACTERISTICS Table 1.
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bq24600 SLUS891A – FEBRUARY 2010 – REVISED OCTOBER 2011 5 V/div PH HIDRV 2 A/div 5 V/div LODRV 2 A/div 5 V/div 20 V/div 20 V/div www.ti.com IL PH LODRV IL t − Time = 40 ns/div t − Time = 40 ns/div Figure 7. Cycle-by-Cycle Synchronous to Nonsynchronous 10 V/div 10 V/div Figure 6. Continuous-Conduction-Mode Switching Waveforms PH 2 A/div LODRV IL IL 20 V/div 2 A/div 5 V/div 5 V/div PH VBAT VBAT t − Time = 200 ms/div t − Time = 4 ms/div Figure 8. Battery Insertion Figure 9.
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bq24600 SLUS891A – FEBRUARY 2010 – REVISED OCTOBER 2011 www.ti.com BLOCK DIAGRAM bq24600 VCC - SRN+100mV + VCC - VUVLO + VCC SLEEP 3.3V LDO VREF UVLO VREF INTERNAL REFERENCE CE 1M COMP ERROR AMPLIFIER BTST CE + + 1V - VFB PWM + LEVEL SHIFTER - 2.1 V HIDRV BAT_OVP 20uA SRP-SRN SRP + SYNCH PH + 20X - + 5 mV - 20xV(SRP-SRN) PWM CONTROL LOGIC + CE - IBAT_ REG VCC SRN BTST _+ PH 20μA - REFRESH 6V LDO ENA_BIAS 4.
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bq24600 SLUS891A – FEBRUARY 2010 – REVISED OCTOBER 2011 www.ti.
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bq24600 SLUS891A – FEBRUARY 2010 – REVISED OCTOBER 2011 www.ti.com PIN FUNCTIONS PIN NO. FUNCTION DESCRIPTION NAME 1 VCC IC power positive supply. Connect, through a 10-Ω resistor to the common-source (diode-OR) point: source of high-side P-channel MOSFET and source of reverse-blocking power P-channel MOSFET. Or connect through a 10-Ω resistor to the cathode of the input diode. Place a 1-μF ceramic capacitor from VCC to the GND pin close to the IC. 2 CE Charge-enable active-HIGH logic input.
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bq24600 SLUS891A – FEBRUARY 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 13.
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bq24600 SLUS891A – FEBRUARY 2010 – REVISED OCTOBER 2011 www.ti.com Precharge On power up, if the battery voltage is below the VLOWV threshold, the bq24600 applies the precharge current to the battery. This 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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bq24600 SLUS891A – FEBRUARY 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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bq24600 SLUS891A – FEBRUARY 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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bq24600 SLUS891A – FEBRUARY 2010 – REVISED OCTOBER 2011 www.ti.com Temperature Qualification The controller continuously monitors battery temperature by measuring the voltage between the TS pin and GND. A negative temperature-coefficient thermistor (NTC) and an external voltage divider typically develop this voltage. The controller compares this voltage against its internal thresholds to determine if charging is allowed.
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bq24600 SLUS891A – FEBRUARY 2010 – REVISED OCTOBER 2011 www.ti.com VREF RT1 bq24600 TS RT2 RTH 103AT Figure 15. TS Resistor Network Timer Fault Recovery The bq24600 provides a recovery method to deal with timer fault conditions. The following summarizes this method: Condition 1: The battery voltage is above the recharge threshold and a timeout fault occurs. Recovery Method: The timer fault clears when the battery voltage falls below the recharge threshold, and battery detection begins.
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bq24600 SLUS891A – FEBRUARY 2010 – REVISED OCTOBER 2011 www.ti.com Table 2. Typical Inductor, Capacitor, and Sense Resistor Values as a Function of Charge Current Charge Current 2A 4A 6A 8A 10 A Output inductor LO 3.3 μH 3.3 μH 2.2 μH 1.5 μH 1.5 μH Output capacitor CO 20 μF 20 μF 30 μF 40 μF 40 μF Sense resistor 10 mΩ 10 mΩ 10 mΩ 10 mΩ 10 mΩ Charge Status Outputs The open-drain STAT outputs indicate various charger operations as shown in Table 3.
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bq24600 SLUS891A – FEBRUARY 2010 – REVISED OCTOBER 2011 www.ti.com Battery Detection For applications with removable battery packs, bq24600 provides a battery-absent detection scheme to reliably detect insertion or removal of battery packs. CE must be HIGH to enable the battery-detection function.
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bq24600 SLUS891A – FEBRUARY 2010 – REVISED OCTOBER 2011 www.ti.com Battery not detected VREG VRECH (VWAKE) Battery inserted VLOWV (VDISH) Battery detected t LOWV_DEG t WAKE tRECH_DEG Figure 17. Battery-Detect Timing Diagram Care must be taken that the total output capacitance at the battery node is not so large that the discharge current source cannot pull the voltage below the LOWV threshold during the 1-second discharge time.
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bq24600 SLUS891A – FEBRUARY 2010 – REVISED OCTOBER 2011 www.ti.com Component List for Typical System Circuit of Figure 1 PART DESIGNATOR QTY DESCRIPTION Q4, Q5 2 N-channel MOSFET, 40 V, 30 A, PowerPAK SO-8, Vishay-Siliconix, SiR426DN D1 1 Diode, dual Schottky, 30 V, 200 mA, SOT23, Fairchild, BAT54C D2 1 Schottky diode, 40V, 5A, SMC, ON Semiconductor, MBRS540T3 RSR 2 Sense resistor, 10 mΩ, 1%, 1 W, 2010, Vishay-Dale, WSL2010R0100F L1 1 Inductor, 3.3 μH, 5.
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bq24600 SLUS891A – FEBRUARY 2010 – REVISED OCTOBER 2011 www.ti.com APPLICATION INFORMATION Inductor Selection The bq24600 has a 1.2-MHz switching frequency to allow the use of small inductor and capacitor values.
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bq24600 SLUS891A – FEBRUARY 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 20-V input voltage, and 40-V or higher rating MOSFETs are preferred for 20-V to 28-V input voltage.
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bq24600 SLUS891A – FEBRUARY 2010 – REVISED OCTOBER 2011 www.ti.com 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 IC. The input filter must be carefully designed and tested to prevent an overvoltage event on the VCC pin. There are several methods for damping or limiting the overvoltage spike during adapter hot plug-in.
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bq24600 SLUS891A – FEBRUARY 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 copper pour for analog ground, but avoid the 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 thermal pad as the single ground connection point.
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bq24600 SLUS891A – FEBRUARY 2010 – REVISED OCTOBER 2011 www.ti.com REVISION HISTORY Changes from Revision Original (February 2010) to Revision A Page • Changed descriptions of PH and BTST pins in Pin Description table ................................................................................ 12 • Changed VHTF to VTCO in two places in Equation 6 ............................................................................................................ 17 • Changed Equation 15 ................
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE MATERIALS INFORMATION www.ti.com 24-Apr-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 BQ24600RVAR VQFN RVA 16 3000 330.0 12.4 3.75 3.75 1.15 8.0 12.0 Q1 BQ24600RVAT VQFN RVA 16 250 180.0 12.4 3.75 3.75 1.15 8.0 12.
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PACKAGE MATERIALS INFORMATION www.ti.com 24-Apr-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) BQ24600RVAR VQFN RVA 16 3000 367.0 367.0 35.0 BQ24600RVAT VQFN RVA 16 250 210.0 185.0 35.
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