Datasheet

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bq24133

www.ti.com

SLUSAF7B –DECEMBER 2010– REVISED MAY 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: bq24133

FEATURES

APPLICATIONS

• 1.6MHz Synchronous Switch-Mode Charger • Tablet PC

with 2.5A Integrated N-MOSFETs

• Netbook and Ultra-Mobile Computers

• Up to 92% 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

• Battery Bay Chargers

• Battery Charge Voltage

• Battery Back-Up Systems

– 1, 2, or 3-Cell with 4.2V/Cell

• High Integration

DESCRIPTION

– Automatic Power Path Selector Between

The bq24133 is highly integrated stand-alone Li-ion

Adapter and Battery

and Li-polymer switch-mode battery charger with two

integrated N-channel power MOSFETs. It offers a

– Dynamic Power Management

constant-frequency synchronous PWM controller with

– Integrated 20-V Switching MOSFETs

high accuracy regulation of input current, charge

– Integrated Bootstrap Diode

current, and voltage. It closely monitors the battery

– Internal Loop Compensation

pack temperature to allow charge only in a preset

– Internal Digital Soft Start

temperature window. It also provides battery

detection, pre-conditioning, charge termination, and

• Safety

charge status monitoring. The thermal regulation loop

– Thermal Regulation Loop Throttles Back

reduces charge current to maintain the junction

Current to Limit T

= 120°C

temperature of 120°C during operation.

– Thermal Shutdown

The bq24133 charges a one, two, or three cell Li-Ion

– Battery Thermistor Sense Hot/Cold Charge

battery in three phases: precondictioning, constant

Suspend & Battery Detect

current, and constant voltage.

– 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 bq24133 automatically

• Accuracy

restarts the charge cycle if the battery voltage falls

– ±0.5% Charge Voltage Regulation

below an internal threshold, and enters a

– ±5% Charge Current Regulation

low-quiescent current sleep mode when the input

– ±6% Input Current Regulation voltage falls below the battery voltage.

• Less than 15μA Battery Current with Adapter

The bq24133 features Dynamic Power Management

Removed

(DPM) to reduce the charge current when the input

• Less than 1.5mA Input Current with Adapter

power limit is reached to avoid over-loading the

Present and Charge Disabled

adapter. A highly-accurate current-sense amplifier

enables precise measurement of input current from

• Small QFN Package

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 (35 pages)

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bq24133 SLUSAF7B – DECEMBER 2010 – REVISED MAY 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: bq24133 FEATURES APPLICATIONS • • • • • • • • 1 • • • • • • • • • 1.6MHz Synchronous Switch-Mode Charger with 2.5A Integrated N-MOSFETs Up to 92% Efficiency 30V Input Rating with Adjustable Over-Voltage Protection – 4.
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bq24133 SLUSAF7B – DECEMBER 2010 – REVISED MAY 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 bq24133 provides power path selector gate driver ACDRV/CMSRC on input NMOS pair ACFET (Q1) and RBFET (Q2), and BATDRV on a battery PMOS device (Q3).
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bq24133 SLUSAF7B – DECEMBER 2010 – REVISED MAY 2011 www.ti.com PIN FUNCTIONS (continued) PIN NO. NAME TYPE DESCRIPTION 8 ACDRV O AC adapter to system switch driver output. Connect to 4-kΩ resistor then to the gate of the ACFET N-channel power MOSFET and the reverse conduction blocking N-channel power MOSFET. Connect both FETs as common-source.
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bq24133 SLUSAF7B – DECEMBER 2010 – REVISED MAY 2011 www.ti.com TYPICAL APPLICATIONS Q2 Q1 RAC: 20m 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 bq24133 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 32.
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bq24133 SLUSAF7B – DECEMBER 2010 – REVISED MAY 2011 www.ti.com RevFET 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 VREF BATDRV ACDRV 3.3?H VBAT bq24133 ISET 0.047? R3 32.4k R5A 32.4k RSR: 10m SW VREF R2 100k R4 100k 4.7µ BTST ACSET REGN 0.1? 0.1? 10? 10? D1 D Optional 1? R6 845k C1 1µ AVCC PGND OVPSET R7 100k RT 103AT SRP VREF R8 6.81k R10 1.
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bq24133 SLUSAF7B – DECEMBER 2010 – REVISED MAY 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) AVCC, ACP, ACN, ACDRV, CMSRC, STAT –0.3 to 30 PVCC –0.3 to 20 BTST –0.3 to 26 BATDRV, SRP, SRN –0.3 to 20 UNIT V –2 to 20 SW OVPSET, REGN, TS, TTC, CELL –0.3 to 7 VREF, ISET, ACSET –0.3 to 3.6 PGND –0.3 to 0.3 SRP–SRN, ACP-ACN –0.5 to 0.
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bq24133 SLUSAF7B – DECEMBER 2010 – REVISED MAY 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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bq24133 SLUSAF7B – DECEMBER 2010 – REVISED MAY 2011 www.ti.com ELECTRICAL CHARACTERISTICS (continued) 4.
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bq24133 SLUSAF7B – DECEMBER 2010 – REVISED MAY 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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bq24133 SLUSAF7B – DECEMBER 2010 – REVISED MAY 2011 www.ti.com ELECTRICAL CHARACTERISTICS (continued) 4.
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bq24133 SLUSAF7B – DECEMBER 2010 – REVISED MAY 2011 www.ti.com ELECTRICAL CHARACTERISTICS (continued) 4.
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bq24133 SLUSAF7B – DECEMBER 2010 – REVISED MAY 2011 www.ti.com TYPICAL CHARACTERISTICS Table 1.
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bq24133 SLUSAF7B – DECEMBER 2010 – REVISED MAY 2011 www.ti.com PH 5V/div PH 5V/div IL 1A/div IL 1A/div 200 ns/div Figure 7. Continuous Conduction Mode Switching 200 ns/div Figure 8. 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 9. BATFET to ACFET Transition During Powerup Figure 10.
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bq24133 SLUSAF7B – DECEMBER 2010 – REVISED MAY 2011 www.ti.com EFFICIENCY vs OUTPUT CURRENT 95 VOUT = 3.8 V AVCC = 5 V 90 Efficiency - % SRN 5V/div PH 10V/div IL 1A/div AVCC = 9 V 85 80 75 4 ms/div 70 0 0.5 1 1.5 2 2.5 IOUT - Output Current - A Figure 13. Battery to Ground Short Transition Figure 14. EFFICIENCY vs OUTPUT CURRENT 95 90 Efficiency - % AVCC = 12 V, 2 cell AVCC = 15 V, 3 cell AVCC = 15 V, 2 cell 85 80 75 70 0 0.5 1 1.5 2 IOUT - Output Current - A 2.5 3 Figure 15.
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bq24133 SLUSAF7B – DECEMBER 2010 – REVISED MAY 2011 www.ti.com FUNCTIONAL BLOCK DIAGRAM CMSRC+6V SLEEP bq24133 ACN-SRN VACN 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 EAI FBO SRN 2 PVCC 3 PVCC CELL 14 1V 2.
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bq24133 SLUSAF7B – DECEMBER 2010 – REVISED MAY 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 17. Typical Charging Profile BATTERY VOLTAGE REGULATION The bq24133 offers a high accuracy voltage regulator on for the charging voltage.
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bq24133 SLUSAF7B – DECEMBER 2010 – REVISED MAY 2011 www.ti.com Under high ambient temperature, the charge current will fold back to keep IC temperature not exceeding 120°C. BATTERY PRECHARGE CURRENT REGULATION On Power-up, if the battery voltage is below the VLOWV threshold, the bq24133 applies the pre-charge current to the battery. This pre-charge feature is intended to revive deeply discharged cells.
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bq24133 SLUSAF7B – DECEMBER 2010 – REVISED MAY 2011 www.ti.com 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. With the adapter source present, if the AVCC voltage is greater than the SRN voltage, the charger exits SLEEP mode. If all conditions are met for charging, the charger then starts charge the battery (see the Enabling and Disabling Charging section).
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bq24133 SLUSAF7B – DECEMBER 2010 – REVISED MAY 2011 www.ti.com provides reverse battery discharge protection, and minimizes system power dissipation with its low-RDSON. The other n-channel FET with drain connected to adapter input (Q1, ACFET) separates battery from adapter, and provides a limited dI/dt when connecting the adapter to the system by controlling the FET turn-on time. The /BATDRV controls a p-channel power MOSFET (Q3, BATFET) placed between battery and system with drain connected to battery.
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bq24133 SLUSAF7B – DECEMBER 2010 – REVISED MAY 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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bq24133 SLUSAF7B – DECEMBER 2010 – REVISED MAY 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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bq24133 SLUSAF7B – DECEMBER 2010 – REVISED MAY 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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bq24133 SLUSAF7B – DECEMBER 2010 – REVISED MAY 2011 www.ti.com VREF bq24133 RT1 TS RT2 RTH 103AT Figure 21. 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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bq24133 SLUSAF7B – DECEMBER 2010 – REVISED MAY 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 Output inductor L 6.8 µH 3.3 µH Output capacitor C 10 µF 20 µF CHARGE STATUS OUTPUTS The open-drain STAT outputs indicate various charger operations as listed in Table 4. These status pins can be used to drive LEDs or communicate with the host processor.
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bq24133 SLUSAF7B – DECEMBER 2010 – REVISED MAY 2011 www.ti.com APPLICATION INFORMATION INDUCTOR SELECTION The bq24133 has a 1600-kHz switching frequency to allow the use of small inductor and capacitor values.
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bq24133 SLUSAF7B – DECEMBER 2010 – REVISED MAY 2011 www.ti.com A cost effective and small size solution is shown in Figure 22. 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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bq24133 SLUSAF7B – DECEMBER 2010 – REVISED MAY 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 25 for Kelvin connection for best current accuracy).
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bq24133 SLUSAF7B – DECEMBER 2010 – REVISED MAY 2011 www.ti.com REVISION HISTORY Changes from Revision A (March 2011) to Revision B Page • Added 30V Input Rating with Adjustable Over-Voltage Protection ....................................................................................... 1 • Added new paragraph to Description (Continued) ...............................................................................................................
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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 BQ24133RGYR VQFN RGY 24 3000 330.0 12.4 3.8 5.8 1.2 8.0 12.0 Q1 BQ24133RGYT VQFN RGY 24 250 180.0 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) BQ24133RGYR VQFN RGY 24 3000 367.0 367.0 35.0 BQ24133RGYT VQFN RGY 24 250 210.0 185.0 35.
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