Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsPMICsPMIC - battery management Charge management, Power management Li-Ion, Li-Po VQFN 24 (5,5x3

bq24170

bq24172

www.ti.com

SLUSAD2B –NOVEMBER 2010– REVISED APRIL 2011

1.6-MHz Synchronous Switch-Mode Li-Ion and Li-Polymer Stand-Alone Battery Charger

with Integrated MOSFETs and Power Path Selector

Check for Samples: bq24170, bq24172

FEATURES

APPLICATIONS

• 1.6MHz Synchronous Switch-Mode Charger • Tablet PC

with 4A Integrated N-MOSFETs

• Netbook and Ultra-Mobile Computers

• Up to 94% Efficiency

• Portable Data Capture Terminals

• 30V Input Rating with Adjustable Over-Voltage

• Portable Printers

Protection

• Medical Diagnostics Equipment

– 4.5V to 17V Input Operating Voltage Range

• Battery Bay Chargers

• Battery Charge Voltage

• Battery Back-Up Systems

– bq24170: 1, 2, or 3-Cell with 4.2V/Cell

– bq24172: Adjustable Charge Voltage DESCRIPTION

The bq24170/172 is highly integrated stand-alone

• High Integration

Li-ion and Li-polymer switch-mode battery charger

– Automatic Power Path Selector Between

with two integrated N-channel power MOSFETs. It

Adapter and Battery

offers a constant-frequency synchronous PWM

– Dynamic Power Management

controller with high accuracy regulation of input

current, charge current, and voltage. It closely

– Integrated 20-V Switching MOSFETs

monitors the battery pack temperature to allow

– Integrated Bootstrap Diode

charge only in a preset temperature window. It also

– Internal Loop Compensation

provides battery detection, pre-conditioning, charge

termination, and charge status monitoring. The

– Internal Digital Soft Start

thermal regulation loop reduces charge current to

• Safety

maintain the junction temperature of 120°C during

– Thermal Regulation Loop Throttles Back

operation.

Current to Limit T

= 120°C

The bq24170/172 charges the battery in three

– Thermal Shutdown

phases: precondictioning, constant current, and

– Battery Thermistor Sense Hot/Cold Charge

constant voltage. The bq24170 charges one, two, or

Suspend & Battery Detect

three cells (selected by CELL pin), and the bq24172

is adjustable for up to three series Li+ cells.

– Input Over-Voltage Protection with

Programmable Threshold

Charge is terminated when the current reaches 10%

of the fast charge rate. A programmable charge timer

– Cycle-by-Cycle Current Limit

offers a safety back up. The bq24170/172

• Accuracy

automatically restarts the charge cycle if the battery

– ±0.5% Charge Voltage Regulation

voltage falls below an internal threshold, and enters a

– ±4% Charge Current Regulation low-quiescent current sleep mode when the input

voltage falls below the battery voltage.

– ±4% Input Current Regulation

The bq24170/172 features Dynamic Power

• Less than 15μA Battery Current with Adapter

Management (DPM) to reduce the charge current

Removed

when the input power limit is reached to avoid

• Less than 1.5mA Input Current with Adapter

over-loading the adapter. A highly-accurate

Present and Charge Disabled

current-sense amplifier enables precise measurement

• Small QFN Package

of input current from adapter to monitor overall

system power.

– 3.5mm × 5.5mm QFN-24 Pin

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 (40 pages)

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bq24170 bq24172 SLUSAD2B – NOVEMBER 2010 – REVISED APRIL 2011 www.ti.com 1.6-MHz Synchronous Switch-Mode Li-Ion and Li-Polymer Stand-Alone Battery Charger with Integrated MOSFETs and Power Path Selector Check for Samples: bq24170, bq24172 FEATURES APPLICATIONS • • • • • • • • 1 • • • • • • • • • 1.6MHz Synchronous Switch-Mode Charger with 4A Integrated N-MOSFETs Up to 94% Efficiency 30V Input Rating with Adjustable Over-Voltage Protection – 4.
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bq24170 bq24172 SLUSAD2B – NOVEMBER 2010 – REVISED APRIL 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. The bq24170/172 charges a battery from a DC source as high as 17V, including a car battery. The input over-voltage limit is adjustable through the OVPSET pin. The AVCC, ACP, and ACN pins have a 30V rating.
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bq24170 bq24172 SLUSAD2B – NOVEMBER 2010 – REVISED APRIL 2011 www.ti.com PIN FUNCTIONS (continued) PIN NO. NAME TYPE DESCRIPTION 11 TTC I Safety Timer and termination control. Connect a capacitor from this node to AGND to set the fast charge safety timer(5.6min/nF). Pre-charge timer is internally fixed to 30 minutes. Pull the TTC to LOW to disable the charge termination and safety timer. Pull the TTC to HIGH to disable the safety timer but allow the charge termination. 12 VREF P 3.
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bq24170 bq24172 SLUSAD2B – NOVEMBER 2010 – REVISED APRIL 2011 www.ti.com TYPICAL APPLICATIONS Q2 Q1 RAC: 10m System 12V Adapter C12: 0.1µ RIN 2 C11: 0.1µ C4: 10µ CIN 2.2? R11 4.02k VBAT ACN ACP CMSRC R12 4.02k D1 VREF R2 232k VREF R4 100k R1 10 BATDRV bq24170 ISET C1 1µ RT 103AT R8 5.23k R9 30.1k R10 1.5k VREF D3 VBAT C8 0.1? C9, C10 10? 10? C6 1? PGND C3: 0.1? VREF C7 0.1? REGN AVCC OVPSET R7 100k C5 0.047? BTST ACSET R6 1000k L: 3.3?H RSR:10m SW VREF R3 32.4k R5 22.
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bq24170 bq24172 SLUSAD2B – NOVEMBER 2010 – REVISED APRIL 2011 www.ti.com Q2 Q1 C12: 0.1µ RIN 2 C11: 0.1µ CIN 2.2? R11 4.02k VBAT ACN ACP CMSRC R12 4.02k D1 R21 100k VREF R4 100k VREF R20 599k R21 499k FB LEARN L: 2.2?H bq24172 C5 0.047? ISET BTST ACSET C1 1µ R6 499k R17 49.9k RT 103AT TS R9 R10 30.1k 1.5k VREF D3 VBAT C8 0.1? C9, C10 ? 10? 20? PGND TTC R8 5.23k RSR:10m C6 1? AVCC C3: 0.1? VREF C7 0.1? REGN OVPSET R7 49.9k Q3 R14 1k SW R22 32.4k R5 32.
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bq24170 bq24172 SLUSAD2B – NOVEMBER 2010 – REVISED APRIL 2011 RevFET www.ti.com Q4 RAC: 20m Adapter Or USB System 0.1µ 0.1µ PVCC ACN ACP CMSRC 1µ VREF Selectable input current limit R5B 8.06k ILIM_500mA R11 5 R4 100k R5A 32.4k VREF 4.7µ BATDRV ACDRV 3.3?H R2 100k RSR: 10m VBAT SW VREF bq24170 ISET 0.047? R3 32.4k BTST ACSET REGN 0.1? D1 Optional 0.1? 10? 10? 1? R6 845k C1 1µ AVCC PGND OVPSET R7 100k RT 103AT SRP VREF R8 6.81k R9 133k R10 1.
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bq24170 bq24172 SLUSAD2B – NOVEMBER 2010 – REVISED APRIL 2011 www.ti.com USB System PVCC ACN ACP CMSRC 1µ VREF Selectable current limit BATDRV ACDRV VREF 3.3?H RSR: 20m ISET 0.047? BTST R5A 12.1k VBAT SW VREF bq24172 R4 100k R5B 12.1k ILIM_500mA R11 5 4.7µ ACSET REGN 0.1? D1 Optional 0.1? 10?10? 1? R6 400k C1 1µ AVCC PGND OVPSET R7 100k RT 103AT SRP VREF TTC R8 5.23k STAT VREF D3 R2 100k FB TS R10 1.5k R9 30.1k SRN THERMAL PAD R1 100k Figure 4.
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bq24170 bq24172 SLUSAD2B – NOVEMBER 2010 – REVISED APRIL 2011 www.ti.com ABSOLUTE MAXIMUM RATINGS over operating free-air temperature range (unless otherwise noted) (1) (2) VALUE Voltage range (with respect to AGND) PVCC –0.3 to 20 AVCC, ACP, ACN, ACDRV, CMSRC, STAT –0.3 to 30 BTST –0.3 to 26 BATDRV, SRP, SRN –0.3 to 20 UNIT –2 to 20 SW FB (bq24172) –0.3 to 16 OVPSET, REGN, TS, TTC, CELL (bq24170) –0.3 to 7 V VREF, ISET, ACSET –0.3 to 3.6 PGND –0.3 to 0.3 SRP–SRN, ACP-ACN –0.
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bq24170 bq24172 SLUSAD2B – NOVEMBER 2010 – REVISED APRIL 2011 www.ti.com ELECTRICAL CHARACTERISTICS 4.5V ≤ V(PVCC, AVCC) ≤ 17V, –40°C < TJ + 125°C, typical values are at TA = 25°C, with respect to AGND (unless otherwise noted) PARAMETER TEST CONDITIONS MIN TYP MAX UNITS OPERATING CONDITIONS VAVCC_OP AVCC input voltage operating range during charging 4.
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bq24170 bq24172 SLUSAD2B – NOVEMBER 2010 – REVISED APRIL 2011 www.ti.com ELECTRICAL CHARACTERISTICS (continued) 4.
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bq24170 bq24172 SLUSAD2B – NOVEMBER 2010 – REVISED APRIL 2011 www.ti.com ELECTRICAL CHARACTERISTICS (continued) 4.5V ≤ V(PVCC, AVCC) ≤ 17V, –40°C < TJ + 125°C, typical values are at TA = 25°C, with respect to AGND (unless otherwise noted) PARAMETER TEST CONDITIONS MIN TYP MAX UNITS 1.
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bq24170 bq24172 SLUSAD2B – NOVEMBER 2010 – REVISED APRIL 2011 www.ti.com ELECTRICAL CHARACTERISTICS (continued) 4.
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bq24170 bq24172 SLUSAD2B – NOVEMBER 2010 – REVISED APRIL 2011 www.ti.com ELECTRICAL CHARACTERISTICS (continued) 4.
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bq24170 bq24172 SLUSAD2B – NOVEMBER 2010 – REVISED APRIL 2011 www.ti.com TYPICAL CHARACTERISTICS Table 1.
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bq24170 bq24172 SLUSAD2B – NOVEMBER 2010 – REVISED APRIL 2011 www.ti.com PH 5V/div PH 5V/div IL 1A/div IL 1A/div 200 ns/div Figure 9. Continuous Conduction Mode Switching 200 ns/div Figure 10. Discontinuous Conduction Mode Switching AVCC 10V/div ACDRV 10V/div IIN 1A/div ISYS 2A/div VSYS 10V/div BATDRV 10V/div IOUT 1A/div 10 ms/div 200 ms/div Figure 11. BATFET to ACFET Transition During Powerup Figure 12.
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bq24170 bq24172 SLUSAD2B – NOVEMBER 2010 – REVISED APRIL 2011 www.ti.com SRN 5V/div PH 10V/div IL 1A/div 4 ms/div Figure 15. Battery to Ground Short Transition 96 94 94 92 VIN 5V BAT 3.8V VIN 9V BAT 3.8V 92 Efficiency - % Efficiency - % 90 90 VIN 15V 3 cell 88 VIN 15V 2 cell 86 88 86 84 84 82 82 80 80 0 0.5 1.0 2.5 2.0 1.5 Charge Current - A 3.0 3.5 4.0 Figure 16. Efficiency vs Output Current (VIN = 15V) 16 0 0.5 1.0 2.5 2.0 1.5 Charge Current - A 3.0 3.5 4.0 Figure 17.
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bq24170 bq24172 SLUSAD2B – NOVEMBER 2010 – REVISED APRIL 2011 www.ti.com FUNCTIONAL BLOCK DIAGRAM CMSRC+6V SLEEP bq24170 ACN-SRN VACN bq24172 UVLO 3.6V ACOV UVLO AVCC ACDRV CHARGE PUMP VSRN+100mV SYSTEM POWER SELECTOR CONTROL 8 ACDRV 7 CMSRC ACN ACUV 4 19 BATDRV VSRN+90mV SLEEP ACN-6V 1.35V LOWV VREF 12 VREF LDO 2.05V RCHRG Thermal PAD AVCC CE BAT_OVP 2.184V REGN LDO 20 REGN 21 BTST SRN EAI FBO 2 PVCC bq24170 CELL (170) 14 FB (172) 3 PVCC 1V 2.
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bq24170 bq24172 SLUSAD2B – NOVEMBER 2010 – REVISED APRIL 2011 www.ti.com DETAILED DESCRIPTION Regulation Voltage VRECH I CHRG Precharge Current Regulation Phase Fastcharge Current Regulation Phase Fastcharge Voltage Regulation Phase Termination Charge Current Charge Voltage VLOWV 10% ICHRG Precharge Timer Fast Charge Safety Timer Figure 19. Typical Charging Profile BATTERY VOLTAGE REGULATION The bq24170/172 offers a high accuracy voltage regulator on for the charging voltage.
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bq24170 bq24172 SLUSAD2B – NOVEMBER 2010 – REVISED APRIL 2011 www.ti.com ICHARGE = VISET 20 ´ RSR (2) The valid input voltage range of ISET is up to 0.8V. With 10mΩ sense resistor, the maximum output current is 4A. With 20mΩ sense resistor, the maximum output current is 2A. The charger is disabled when ISET pin voltage is below 40mV and is enabled when ISET pin voltage is above 120mV. For 10mΩ current sensing resistor, the minimum fast charge current must be higher than 600mA.
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bq24170 bq24172 SLUSAD2B – NOVEMBER 2010 – REVISED APRIL 2011 www.ti.com Pull TTC pin to AGND to disable both termination and fast charge safety timer (reset timer). Pull TTC pin to VREF to disable the safety timer, but allow charge termination. POWER UP The charge uses a SLEEP comparator to determine the source of power on the AVCC pin, since AVCC can be supplied either from the battery or the adapter.
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bq24170 bq24172 SLUSAD2B – NOVEMBER 2010 – REVISED APRIL 2011 www.ti.com The ACDRV is used to drive a pair of back-to-back n-channel power MOSFETs between adapter and ACP with sources connected together to CMSRC. The n-channel FET with the drain connected to the ACP (Q2, RBFET) provides reverse battery discharge protection, and minimizes system power dissipation with its low-RDSON.
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bq24170 bq24172 SLUSAD2B – NOVEMBER 2010 – REVISED APRIL 2011 www.ti.com CHARGE UNDER-CURRENT PROTECTION After the recharge, if the SRP-SRN voltage decreases below 5mV, the low side FET will be turned off for the rest of the switching cycle. During discontinuous conduction mode (DCM), the low side FET will only turn on for a short period of time when the boostrap capacitor voltage drops below 4V to provide refresh charge for the capacitor.
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bq24170 bq24172 SLUSAD2B – NOVEMBER 2010 – REVISED APRIL 2011 www.ti.com Once the device has powered up, a 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 (125mA). If the battery voltage gets up above the recharge threshold within 500ms, there is no battery present and the cycle restarts.
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bq24170 bq24172 SLUSAD2B – NOVEMBER 2010 – REVISED APRIL 2011 www.ti.com TEMPERATURE QUALIFICATION The controller continuously monitors battery temperature by measuring the voltage between the TS pin and AGND. 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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bq24170 bq24172 SLUSAD2B – NOVEMBER 2010 – REVISED APRIL 2011 www.ti.com VREF bq24170 bq24172 RT1 TS RT2 RTH 103AT Figure 23. TS Resistor Network MOSFET SHORT CIRCUIT AND INDUCTOR SHORT CIRCUIT PROTECTION The IC has a short circuit protection feature. Its cycle-by-cycle current monitoring feature is achieved through monitoring the voltage drop across Rdson of the MOSFETs. The charger will be latched off, but the ACFET keep on to power the system.
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bq24170 bq24172 SLUSAD2B – NOVEMBER 2010 – REVISED APRIL 2011 www.ti.com Table 3 provides a summary of typical LC components for various charge currents. Table 3. Typical Values as a Function of Charge Current CHARGE CURRENT 1A 2A 3A 4A Output inductor L 6.8 µH 3.3 µH 3.3 µH 2.2 µH Output capacitor C 10 µF 20 µF 20 µF 30 µF CHARGE STATUS OUTPUTS The open-drain STAT outputs indicate various charger operations as listed in Table 4.
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bq24170 bq24172 SLUSAD2B – NOVEMBER 2010 – REVISED APRIL 2011 www.ti.com APPLICATION INFORMATION INDUCTOR SELECTION The bq24170/72 has a 1600-kHz switching frequency to allow the use of small inductor and capacitor values.
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bq24170 bq24172 SLUSAD2B – NOVEMBER 2010 – REVISED APRIL 2011 www.ti.com A cost effective and small size solution is shown in Figure 24. R1 and C1 are composed of a damping RC network to damp the hot plug-in oscillation. As a result, the over-voltage spike is limited to a safe level. D1 is used for reverse voltage protection for the AVCC pin. C2 is the AVCC pin decoupling capacitor and it should be placed as close as possible to the AVCC pin.
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bq24170 bq24172 SLUSAD2B – NOVEMBER 2010 – REVISED APRIL 2011 www.ti.com 3. 4. 5. 6. 7. 8. 9. area to any other trace or plane. The charging current sensing resistor should be placed right next to the inductor output. Route the sense leads connected across the sensing resistor back to the IC in the same layer, close to each other (minimize loop area) and do not route the sense leads through a high-current path (see Figure 27 for Kelvin connection for best current accuracy).
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bq24170 bq24172 SLUSAD2B – NOVEMBER 2010 – REVISED APRIL 2011 www.ti.com REVISION HISTORY Changes from Original (November 2010) to Revision A • Page Changed status from product preview to production data .................................................................................................... 1 Changes from Revision A (November 2010) to Revision B Page • Changed FEATURES third bullet to 30V Input Rating with Adjustable Over-Voltage Protection and added sub-bullet: 4.
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PACKAGE OPTION ADDENDUM www.ti.
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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 BQ24170RGYR VQFN RGY 24 SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant 3000 330.0 12.4 3.8 5.8 1.2 8.0 12.0 Q1 BQ24170RGYT VQFN RGY 24 250 180.0 12.4 3.8 5.8 1.2 8.0 12.0 Q1 BQ24172RGYR VQFN RGY 24 3000 330.0 12.4 3.8 5.8 1.2 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) BQ24170RGYR VQFN RGY 24 3000 367.0 367.0 35.0 BQ24170RGYT VQFN RGY 24 250 210.0 185.0 35.0 BQ24172RGYR VQFN RGY 24 3000 367.0 367.0 35.0 BQ24172RGYT VQFN RGY 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.