Datasheet

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

QTJ

QFN-24

TOP VIEW

24 23 22 21 20 19

7 8 9 10 11 12

ACN

ACP

ACDRV

STAT1

SRN

SRP

ISET2

ACSET

GND

REGN

TTC

STAT2

VREF

ISET1

VFB

VCC

BATDRV

BTST

HIDRV

LODRV

bq24616

www.ti.com

SLUSA49B –APRIL 2010– REVISED OCTOBER 2011

JEITA Guideline Compatible Stand-Alone Synchronous Switch-Mode Li-Ion or Li-Polymer

Battery Charger With System Power Selector and Low I

Check for Samples: bq24616

FEATURES

– < 15-µA Off-State Battery Discharge Current

– < 1.5-mA Off-State Input Quiescent Current

• Battery Thermistor Sense for JEITA Guideline

Compatible Charger

APPLICATIONS

• 600-kHz NMOS-NMOS Synchronous Buck

Converter • Netbook, Mobile Internet Device and

Ultra-Mobile PC

• Stand-Alone Charger Support for Li-Ion or

Li-Polymer • Industrial and Medical Equipment

• 5-V–28-V VCC Input Operating Range and • Personal Digital Assistants

Supports 1-6 Battery Cells

• Handheld Terminals

• Up to 10A Charge Current and Adapter Current

• Portable Equipment

• High-Accuracy Voltage and Current Regulation

DESCRIPTION

– ±0.5% Charge Voltage Accuracy

The bq24616 is a highly integrated, Japan Electronic

– ±3% Charge Current Accuracy

Information Technology Association (JEITA)

– ±3% Adapter Current Accuracy

guideline-compatible, Li-ion or Li-polymer

• Integration

switch-mode battery charge controller. It offers a

constant-frequency synchronous switching PWM

– Automatic System Power Selection From

controller with high-accuracy charge-current and

Adapter or Battery

-voltage regulation, charge preconditioning,

– Internal Loop Compensation

termination, adapter current regulation, and

– Internal Soft Start

charge-status monitoring.

– Dynamic Power Management

The bq24616 charges the battery in three phases:

preconditioning, constant-current, and

• Safety Protection

constant-voltage. Charge is terminated when the

– Input Overvoltage Protection

current reaches a minimum user-selectable level. A

– Battery Detection

programmable charge timer provides a safety

– Reverse Protection Input FET

backup. The bq24616 automatically restarts the

charge cycle if the battery voltage falls below an

– Programmable Safety Timer

internal threshold, and enters a low-quiescent-current

– Charge Overcurrent Protection

sleep mode when the input voltage falls below the

– Battery Short Protection

battery voltage.

– Battery Overvoltage Protection

PACKAGE AND PIN-OUT

– Thermal Shutdown

• Status Outputs

– Adapter Present

– Charger Operation Status

• Charge Enable Pin

• 6-V Gate Drive for Synchronous Buck

Converter

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

Effective Duty Cycle

• 24-pin, 4-mm × 4-mm QFN Package

• Energy Star Low Quiescent Current I

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 (37 pages)

PAGE 1
bq24616 SLUSA49B – APRIL 2010 – REVISED OCTOBER 2011 www.ti.com JEITA Guideline Compatible Stand-Alone Synchronous Switch-Mode Li-Ion or Li-Polymer Battery Charger With System Power Selector and Low Iq Check for Samples: bq24616 FEATURES – < 15-µA Off-State Battery Discharge Current – < 1.
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bq24616 SLUSA49B – APRIL 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.
PAGE 3
bq24616 SLUSA49B – APRIL 2010 – REVISED OCTOBER 2011 www.ti.com THERMAL INFORMATION bq24616 THERMAL METRIC (1) RGE UNIT 24 PINS Junction-to-ambient thermal resistance (2) θJA (3) 43 °C/W θJCtop Junction-to-case (top) thermal resistance 54.3 °C/W θJB Junction-to-board thermal resistance (4) 20 °C/W ψJT Junction-to-top characterization parameter (5) 0.
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bq24616 SLUSA49B – APRIL 2010 – REVISED OCTOBER 2011 www.ti.com RECOMMENDED OPERATING CONDITIONS VALUE MAX –0.3 28 V PH –2 30 V VFB –0.3 14 V REGN, LODRV, ACSET, TS, TTC –0.3 6.5 V BTST, HIDRV with respect to GND –0.3 34 V ISET1, ISET2 –0.3 3.3 V 0 3.3 V –0.2 0.
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bq24616 SLUSA49B – APRIL 2010 – REVISED OCTOBER 2011 www.ti.
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bq24616 SLUSA49B – APRIL 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 CHARGE TERMINATION Termination current-set factor (amps of termination current per volt on ISET2 pin) KTERM RSENSE = 10 mΩ Termination-current accuracy 1 A/V VITERM = 20 mV –4% 4% VITERM = 5 mV –25% 25% VITERM = 1.
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bq24616 SLUSA49B – APRIL 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.
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bq24616 SLUSA49B – APRIL 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 1 5 9 UNIT CHARGE UNDERCURRENT COMPARATOR (CYCLE-BY-CYCLE) VISYNSET Charge undercurrent falling threshold Switch from SYNCH to NON-SYNCH, VSRP > 2.
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bq24616 SLUSA49B – APRIL 2010 – REVISED OCTOBER 2011 www.ti.
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bq24616 SLUSA49B – APRIL 2010 – REVISED OCTOBER 2011 www.ti.com TYPICAL CHARACTERISTICS Table 1.
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bq24616 SLUSA49B – APRIL 2010 – REVISED OCTOBER 2011 5 V/div PH HIDRV LODRV 1 A/div 5 V/div PH 2 A/div 5 V/div 20 V/div 20 V/div www.ti.com IL LODRV IL t − Time = 100 ns/div t − Time = 100 ns/div Figure 7. Cycle-by-Cycle Synchronous to Nonsynchronous 2 A/div 10 V/div Figure 6. Continuous-Conduction Mode-Switching Waveform PH 5 V/div 2 A/div IIN 2 A/div 2 A/div ISYS IBAT IL VBAT t − Time = 200 μs/div t − Time = 200 ms/div Figure 9.
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bq24616 SLUSA49B – APRIL 2010 – REVISED OCTOBER 2011 www.ti.com 98 96 94 Efficiency - % 92 90 20 Vin, 4 cell 88 12 Vin, 2 cell 86 20 Vin, 3 cell 84 12 Vin, 1 cell 82 80 0 1 2 5 4 3 IBAT - Output Current - A 6 7 8 Figure 12.
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bq24616 SLUSA49B – APRIL 2010 – REVISED OCTOBER 2011 www.ti.com Pin Functions – 24-Pin QFN PIN NO. NAME FUNCTION DESCRIPTION I/O 1 ACN I 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 I Adapter current-sense resistor, positive input. A 0.
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bq24616 SLUSA49B – APRIL 2010 – REVISED OCTOBER 2011 www.ti.com BLOCK DIAGRAM bq24616 VREF VCC-6 V ACN ACN-6 V ACN-6 V LDO INTERNAL REFERENCE VREF 3.
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bq24616 SLUSA49B – APRIL 2010 – REVISED OCTOBER 2011 www.ti.
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bq24616 SLUSA49B – APRIL 2010 – REVISED OCTOBER 2011 www.ti.com DETAILED DESCRIPTION Regulation Voltage VRECH Regulation Current Precharge Current Regulation Phase Fastcharge Current Regulation Phase Fastcharge Voltage Regulation Phase Termination Charge Current Charge Voltage VLOWV IPRECH & I TERM Precharge Time Fastcharge Safety Time Figure 15.
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bq24616 SLUSA49B – APRIL 2010 – REVISED OCTOBER 2011 www.ti.com Input Adapter Current Regulation The total input from an ac adapter or other dc source is a function of the system supply current and the battery charging current. System current normally fluctuates as portions of the systems are powered up or down. Without dynamic power management (DPM), the source must be able to supply the maximum system current and the maximum charger input current simultaneously.
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bq24616 SLUSA49B – APRIL 2010 – REVISED OCTOBER 2011 www.ti.com Power Up The bq24616 uses a SLEEP comparator to determine the source of power on the VCC pin, because VCC can be supplied either from the battery or the adapter. If the VCC voltage is greater than the SRN voltage, the bq24616 enables the ACFET and disables BATFET. If all other conditions are met for charging, the bq24616 then attempts to charge the battery (see Enable and Disable Charging Enable and Disable Charging).
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bq24616 SLUSA49B – APRIL 2010 – REVISED OCTOBER 2011 www.ti.com Asymmetrical gate drive (fast turnoff and slow turnon) for the ACDRV and BATDRV drivers provides fast turnoff and slow turnon of the ACFET and BATFET to help the break-before-make logic and to allow a soft start at turnon of either FET. The soft-start time can be further increased by putting a capacitor from gate to source of the p-channel power MOSFETs.
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bq24616 SLUSA49B – APRIL 2010 – REVISED OCTOBER 2011 www.ti.com MOSFET is turned on again. The 80-ns low-side MOSFET on-time is required to ensure the bootstrap capacitor is always recharged and able to keep the high-side power MOSFET on during the next cycle. This is important for battery chargers, where unlike regular dc-dc converters, there is a battery load that maintains a voltage and can both source and sink current.
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bq24616 SLUSA49B – APRIL 2010 – REVISED OCTOBER 2011 www.ti.com Temperature Qualification and JEITA Guideline The controller continuously monitors battery temperature by measuring the voltage between the TS pin and GND. A negative-temperature-coefficient (NTC) thermistor 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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bq24616 SLUSA49B – APRIL 2010 – REVISED OCTOBER 2011 www.ti.com VREF RT1 bq24616 TS RT2 RTH 103AT Figure 17. TS Resistor Network For example, 103AT NTC thermistors are used to monitor the battery pack temperature. Selecting T1 = 0ºC for COLD and T5 = 60ºC for HOT resuts in RT2 = 6.8 kΩ and RT1 = 2.2 kΩ as calculated in the bq246xx Calculation Tool, available in the Tools & Software section of the product folder. A small RC filter is suggested to use for system-level ESD protection.
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bq24616 SLUSA49B – APRIL 2010 – REVISED OCTOBER 2011 www.ti.com Table 2. Typical Inductor, Capacitor, and Sense Resistor Values as a Function of Charge Current for bq24616 (600 kHz Switching Frequency) CHARGE CURRENT 2A 4A 6A 8A 10A Output inductor LO 6.8 μH 6.8 μH 4.7 μH 3.3 μH 3.
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bq24616 SLUSA49B – APRIL 2010 – REVISED OCTOBER 2011 www.ti.com Battery Detection For applications with removable battery packs, the bq24616 provides a battery-absent detection scheme to detect insertion or removal of battery packs reliably.
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bq24616 SLUSA49B – APRIL 2010 – REVISED OCTOBER 2011 www.ti.com Battery not detected VREG VRECH (VWAKE) Battery inserted VLOWV Battery detected (VDISH) tRECH_DEG tLOWV_DEG tWAKE Figure 19. 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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bq24616 SLUSA49B – APRIL 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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bq24616 SLUSA49B – APRIL 2010 – REVISED OCTOBER 2011 www.ti.com APPLICATION INFORMATION Inductor Selection The bq24616 has 600-kHz switching frequency to allow the use of small inductor and capacitor values.
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bq24616 SLUSA49B – APRIL 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 perfered for 20-V to 28-V input voltage.
PAGE 29
bq24616 SLUSA49B – APRIL 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 the IC. The input filter must be carefully designed and tested to prevent overvoltage events on the VCC pin.
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bq24616 SLUSA49B – APRIL 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 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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PACKAGE OPTION ADDENDUM www.ti.
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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 BQ24616RGER VQFN RGE 24 3000 330.0 12.4 4.25 4.25 1.15 8.0 12.0 Q2 BQ24616RGET 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) BQ24616RGER VQFN RGE 24 3000 367.0 367.0 35.0 BQ24616RGET 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.