Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsPMICsPMIC - battery management Charge management Li-Ion, Li-Po VQFN 14 (3,5x3,5) Surface-mount

VREF

1.0 Hm

10nF

BOOT

PACK-

PACK+

AUXPWR

SCL

SDA

CSOUT

CSIN

PGND

CBUS

bq24155

10kW

VAUX

HOST

SCL

SDA

STAT

VREF

STAT

PMID

VBUS

BUS

1 Fm

4.7 Fm

BOOT

ISEL

AUXPWR

ISEL

1 0

SNS

0.1

10kW

SGND

bq24155

www.ti.com

SLUS942 –FEBRUARY 2010

Fully Integrated Switch-Mode One-Cell Li-Ion Charger with Full USB Compliance

Check for Samples: bq24155

FEATURES

• Charge Faster than Linear Chargers

APPLICATIONS

• Mobile and Smart Phones

• High-Accuracy Voltage and Current Regulation

• MP3 Players

– Input Current Regulation Accuracy: ±5%

• Handheld Devices

(100 mA and 500 mA)

– Charge Voltage Regulation Accuracy:

DESCRIPTION

±0.5% (25°C), ±1% (0°C-125°C)

The bq24155 is a compact, flexible, high-efficiency,

– Charge Current Regulation Accuracy: ±5%

USB-friendly switch-mode charge management

• High-Efficiency Mini-USB/AC Battery Charger

device for single-cell Li-ion and Li-polymer batteries

for Single-Cell Li-Ion and Li-Polymer Battery

used in a wide range of portable applications. The

Packs

charge parameters can be programmed through an

• 20-V Absolute Maximum Input Voltage Rating

C interface. The bq24155 integrates a synchronous

PWM controller, power FETs, input current sensing,

• 6-V Maximum Operating Input Voltage

high-accuracy current and voltage regulation, and

• Built-In Input Current Sensing and Limiting

charge termination, into a small WCSP package.

• Integrated Power FETs for Up To 1.25-A

The bq24155 charges the battery in three phases:

Charge Rate

conditioning, constant current and constant voltage.

• Programmable Charge Parameters through

The input current is automatically limited to the value

C™ Compatible Interface (up to 3.4 Mbps):

set by the host. Charge is terminated based on

user-selectable minimum current level. A safety timer

– Input Current

with reset control provides a safety backup for I

– Fast-Charge/Termination Current

interface. During normal operation, bq24155

– Charge Voltage (3.5 V to 4.44 V)

automatically restarts the charge cycle if the battery

– Safety Timer with Reset Control

voltage falls below an internal threshold and

automatically enters sleep mode or high impedance

– Termination Enable

mode when the input supply is removed. The charge

• Synchronous Fixed-Frequency PWM

status is reported to the host using the I

C compatible

Controller Operating at 3 MHz with 0% to

interface.

99.5% Duty Cycle

Typical Application Circuit

• Automatic High Impedance Mode for Low

Power Consumption

• Robust Protection

– Reverse Leakage Protection Prevents

Battery Drainage

– Thermal Regulation and Protection

– Input/Output Overvoltage Protection

• Status Output for Charging and Faults

• USB Friendly Boot-Up Sequence

• Automatic Charging

• Power Up System without Battery

• 3.5 mm x 3.5 mm 14-Pin QFN Package

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.

C is a trademark of Philips Electronics.

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)

PAGE 1
bq24155 www.ti.com SLUS942 – FEBRUARY 2010 Fully Integrated Switch-Mode One-Cell Li-Ion Charger with Full USB Compliance Check for Samples: bq24155 FEATURES 1 • • 2 • • • • • • • • • • • • • • Charge Faster than Linear Chargers High-Accuracy Voltage and Current Regulation – Input Current Regulation Accuracy: ±5% (100 mA and 500 mA) – Charge Voltage Regulation Accuracy: ±0.
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bq24155 SLUS942 – FEBRUARY 2010 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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bq24155 www.ti.com SLUS942 – FEBRUARY 2010 ORDERING INFORMATION (1) MARKING MEDIUM QUANTITY bq24155RGYR Part NO. bq24155 Tape and Reel 3000 bq24155RGYT bq24155 Tape and Reel 250 (1) For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI website at www.ti.com. DISSIPATION RATINGS (1) RqJA RqJC TA ≤ 25°C POWER RATING DERATING FACTOR TA > 25°C 55°C/W (2) 15°C/W 1.82 W 0.
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bq24155 SLUS942 – FEBRUARY 2010 www.ti.com ELECTRICAL CHARACTERISTICS Circuit of Figure 1, VBUS = 5 V, HZ_MODE = 0, OPA_MODE = 0 (charger mode operation), TJ = 0°C to 125°C, TJ = 25°C for typical values (unless otherwise noted) PARAMETER TEST CONDITIONS MIN TYP MAX UNIT INPUT CURRENTS VBUS > VBUS(min), PWM switching 10 VBUS > VBUS(min), PWM NOT switching I(VBUS) VBUS supply current control Ilkg mA 5 0°C < TJ < 85°C, VBUS = 5 V, HZ_MODE = 1, V(AUXPWR) > V(LOWV), SCL, SDA, ISEL = 0 V or 1.
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bq24155 www.ti.
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bq24155 SLUS942 – FEBRUARY 2010 www.ti.com ELECTRICAL CHARACTERISTICS (continued) Circuit of Figure 1, VBUS = 5 V, HZ_MODE = 0, OPA_MODE = 0 (charger mode operation), TJ = 0°C to 125°C, TJ = 25°C for typical values (unless otherwise noted) PARAMETER I(LIMIT) V(SHORT) I(SHORT) TEST CONDITIONS MIN TYP MAX Charge mode operation 1.5 2.3 3 Short-circuit voltage threshold V(AUXPWR) falling 1.9 2 2.
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bq24155 www.ti.com SLUS942 – FEBRUARY 2010 TYPICAL APPLICATION CIRCUITS (continued) LO 1.0 mH VBUS VBUS CIN CIN 4.7 mF SCL SDA STAT 2 10 kW 10 kW 10 kW I C BUS ISEL 10 kW V OUT CO 10 mF Q CCSIN 0.1 mF PGND Host Charge Controller CSIN CSOUT SCL SDA STAT ISEL SGND HostControlled Switch 10nF BOOT PMID VAUX 10 kW 68 mW CBOOT U1 bq24155 1 mF RSNS SW AUXPWR VREF CAUXPWR C VREF 1 mF CCSOUT 0.1 mF VSYS PACK + + PACK - 1 mF HOST Figure 2.
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bq24155 SLUS942 – FEBRUARY 2010 www.ti.com TYPICAL CHARACTERISTICS (continued) BATTERY DETECTION AT POWER UP CYCLE BY CYCLE CURRENT LIMIT IN CHARGE MODE VBUS 5 V/div VSW 2 V/div VIN = 0-5 V, No Battery, COUT = 100 mF, RLOAD = 5 kW VBAT 1 V/div ISEL 5 V/div IL 0.5 A/div Vbus = 5 V, Vbat = 3.6 V Charge mode operation IBAT 50 mA/div 20 mS/div 2 mS/div Figure 7. Figure 8.
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bq24155 www.ti.
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bq24155 SLUS942 – FEBRUARY 2010 www.ti.
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bq24155 www.ti.com SLUS942 – FEBRUARY 2010 DETAILED FUNCTIONAL DESCRIPTION For a current limited power source, such as a USB host or hub, a high efficiency converter is critical to fully use the input power capacity for quickly charging the battery. Due to the high efficiency for a wide range of input voltages and battery voltages, the switch mode charger is a good choice for high speed charging with less power loss and better thermal management than a linear charger.
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bq24155 SLUS942 – FEBRUARY 2010 www.ti.com Precharge Phase Current Regulation Phase Voltage Regulation Phase Regulation Voltage Regulation Current Charge Voltage V SHORT Charge Current Termination I SHORT Precharge (Linear Charge) Precharge Phase Fast Charge (PWM Charge) (a) Current Regulation Phase Voltage Regulation Phase Regulation voltage Charge Voltage VSHORT Charge Current Termination I SHORT Precharge (Linear Charge) Fast Charge (PWM Charge) (b) Figure 13.
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bq24155 www.ti.com SLUS942 – FEBRUARY 2010 PWM Controller in Charge Mode The bq24155 provides an integrated, fixed 3-MHz frequency voltage-mode controller with Feed-Forward function to regulate charge current or voltage. This type of controller is used to improve line transient response, thereby, simplifying the compensation network used for both continuous and discontinuous current conduction operation.
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bq24155 SLUS942 – FEBRUARY 2010 www.ti.com Charge Start Start T32min Timer Reset Charge Parameters Yes T32sec Expired? Start T32sec Stop T32min No No Yes Charge T32min Active? Yes Any I2C WriteAction? No T32min Expired? No Host Should Reset T32sec Timer Yes Timer Fault Figure 14.
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bq24155 www.ti.com SLUS942 – FEBRUARY 2010 Input Voltage Protection in Charge Mode Sleep Mode The bq24155 enters the low-power sleep mode if the voltage on VBUS pin falls below sleep-mode entry threshold, VAUXPWR + VSLP, and VBUS is still higher than the poor source detection threshold, VIN(min). This feature prevents draining the battery during the absence of VBUS. During sleep mode, both the reverse blocking switch Q1 and PWM are turned off.
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bq24155 SLUS942 – FEBRUARY 2010 www.ti.com Charge Status Output, STAT Pin The STAT pin is used to indicate operation conditions for bq24155. STAT is pulled low during charging when EN_STAT bit in control register (00H) is set to "1". Under other conditions, the STAT pin acts as a high impedance (open-drain) output. Under fault conditions, a 128-ms pulse is sent out to notify the host. The status of STAT pin at different operation conditions is summarized in Table 1.
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bq24155 www.ti.com SLUS942 – FEBRUARY 2010 To reduce the output voltage ripple, a ceramic capacitor with the capacitance between 4.7 mF and 47 mF is recommended for COUT, see the application section for components selection. Pre-Regulator Application Figure 2 shows a typical pre-regulator application that the bq24155 operates as a DC/DC converter, with the termination disabled.
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bq24155 SLUS942 – FEBRUARY 2010 www.ti.com DATA CLK Data Line Stable; Data Valid Change of Data Allowed Figure 16. Bit Transfer on the Serial Interface The master generates further SCL cycles to either transmit data to the slave (R/W bit 1) or receive data from the slave (R/W bit 0). In either case, the receiver needs to acknowledge the data sent by the transmitter. So an acknowledge signal can either be generated by the master or by the slave, depending on which one is the receiver.
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bq24155 www.ti.com SLUS942 – FEBRUARY 2010 Recognize START or REPRATED START Condition Recognize STOP or REPRATED START Condition Generate ACKNOWLEDGE Signal P SDA Acknowledgement Signal From Slave MSB Sr Address R/W SCL S or Sr ACK ACK Sr or P Clock Line Held Low While Interrupts are Serviced Figure 18. Bus Protocol H/S Mode Protocol When the bus is idle, both SDA and SCL lines are pulled high by the pull-up devices.
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bq24155 SLUS942 – FEBRUARY 2010 www.ti.
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bq24155 www.ti.com SLUS942 – FEBRUARY 2010 REGISTER DESCRIPTION Table 3.
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bq24155 SLUS942 – FEBRUARY 2010 www.ti.com Table 6. Vender/Part/Revision Register (Read only) Memory Location: 03, Reset State: 0100 x001 (continued) BIT NAME READ/WRITE B2 Revision2 Read Only B1 Revision1 Read Only B0 (LSB) Revision0 Read Only FUNCTION 011: Revision 1.3; 100-111: Future Revisions Table 7.
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bq24155 www.ti.com SLUS942 – FEBRUARY 2010 POWER TOPOLOGIES System Load After Sensing Resistor One of the simple high-efficiency topologies connects the system load directly across the battery pack, as shown in Figure 20. The input voltage has been converted to a usable system voltage with good efficiency from the input. When the input power is on, it supplies the system load and charges the battery pack at the same time. When the input power is off, the battery pack powers the system directly.
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bq24155 SLUS942 – FEBRUARY 2010 • www.ti.com close to the short circuit current levels and the battery may not reach the fast-charge region in a timely manner. As a result, the safety timers flag the battery pack as defective, terminating the charging process. Because the safety timer cannot be disabled, the inserted battery pack must not be depleted to make the application possible.
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bq24155 www.ti.com SLUS942 – FEBRUARY 2010 VBAT ´ (VBUS - VBAT) VBUS ´ f ´ D IL L OUT = , the worst case is when battery voltage is as close as to half of the input voltage. LOUT = 2.5 ´ (5 - 2.5) 5 ´ (3 ´ 106 ) ´ 1.25 ´ 0.3 (4) LOUT = 1.11 mH Select the output inductor to standard 1 mH. Calculate the total ripple current with using the 1 mH inductor: DIL = VBAT ´ (VBUS - VBAT) VBUS ´ f ´ LOUT (5) 2.5 ´ (5 - 2.5) DIL = 5 ´ (3 ´ 106 ) ´ (1 ´ 10-6 ) (6) ΔIL = 0.
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bq24155 SLUS942 – FEBRUARY 2010 R(SNS) = www.ti.com 85mV 1.25A (13) R(SNS) = 68 mΩ This is a standard value. If it is not a standard value, then choose the next close value and calculate the real charge current. Calculate the power dissipation on the sense resistor: P(RSNS) = I(CHARGE) 2 × R(SNS) P(RSNS) = 1252 × 0.068 P(RSNS) = 0.106 W Select 0402 0.125-W 68-mΩ 2% sense resistor, i.e. Panasonic ERJ2BWGR068. 4. Measured efficiency and total power loss for different inductors are shown in Figure 22.
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bq24155 www.ti.com • SLUS942 – FEBRUARY 2010 Place 4.7uF input capacitor as close to PMID pin and PGND pin as possible to make high frequency current loop area as small as possible. Place 1uF input capacitor as close to VBUS pin and PGND pin as possible to make high frequency current loop area as small as possible (see Figure 25). L1 VBUS SW R1 V BAT High Frequency BAT V IN Current Path PMID PGND C3 C2 C1 Figure 23.
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PACKAGE OPTION ADDENDUM www.ti.com 17-Mar-2010 PACKAGING INFORMATION Orderable Device Status (1) Package Type Package Drawing Pins Package Eco Plan (2) Qty BQ24155RGYR ACTIVE VQFN RGY 14 3000 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR BQ24155RGYT ACTIVE VQFN RGY 14 250 CU NIPDAU Level-2-260C-1 YEAR Green (RoHS & no Sb/Br) Lead/Ball Finish MSL Peak Temp (3) (1) The marketing status values are defined as follows: ACTIVE: Product device recommended for new designs.
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PACKAGE MATERIALS INFORMATION www.ti.com 14-Jul-2012 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 BQ24155RGYR VQFN RGY 14 3000 330.0 12.4 3.75 3.75 1.15 8.0 12.0 Q1 BQ24155RGYT VQFN RGY 14 250 180.0 12.4 3.75 3.75 1.15 8.0 12.
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PACKAGE MATERIALS INFORMATION www.ti.com 14-Jul-2012 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) BQ24155RGYR VQFN RGY 14 3000 367.0 367.0 35.0 BQ24155RGYT VQFN RGY 14 250 210.0 185.0 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 JESD46C and to discontinue any product or service per JESD48B. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.