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BQ25050DQCR

BQ25050DQCR

  • 厂商:

    BURR-BROWN(德州仪器)

  • 封装:

    WSON-10_2X3MM-EP

  • 描述:

    IC BATT CHRG MGMT LI-ION 10WSON

  • 详情介绍
  • 数据手册
  • 价格&库存
BQ25050DQCR 数据手册
bq25050 www.ti.com SLUSA33 – MARCH 2010 1A, Single-Input, Single Cell Li-Ion Battery Charger with 50-mA LDO, External Power Path Control, and Single Input Interface Check for Samples: bq25050 FEATURES 1 • • • • • • • • • • • DESCRIPTION 30V input Rating, With 10.5V Over-Voltage Protection (OVP) FET Controller for External Battery FET for External Power Path Control (BGATE) Input Voltage Dynamic Power Management 50mA integrated Low Dropout Linear Regulator (LDO) Programmable Charge Current Through Single Input Interface (CTRL) 0.5% Battery Voltage Regulation Accuracy 7% Charge Current Regulation Accuracy Thermal Regulation and Protection Battery NTC Monitoring During Charge and Discharge Status Indication – Charging/Done and Temperature Faults Available in small 2mm × 3mm 10 Pin SON Package The bq25050 is a highly integrated Li-Ion linear battery charger targeted at space-limited portable applications. It operates from either a USB port or AC Adapter and charges a single-cell Li-Ion battery with up to 1A of charge current. The 30V input voltage range with input over-voltage protections supports low-cost unregulated adapters. The bq25050 has a single power output that charges the battery. The system load is connected to OUT. The low-battery system startup circuitry maintains OUT greater than 3.4V whenever an input source is connected. This allows the system to start-up and run whenever an input source is connected regardless of the battery voltage. The charge current is programmable up to 1A using the CTRL input. Additionally, a 4.9V 50mA LDO is integrated into the IC for supplying low power external circuitry. The battery is charged in three phases: conditioning, constant current and constant voltage. In all charge phases, an internal control loop monitors the IC junction temperature and reduces the charge current if an internal temperature threshold is exceeded. The charger power stage and charge current sense functions are fully integrated. The charger function has high accuracy current and voltage regulation loops, charge status display, and charge termination. APPLICATIONS • • • • Smart Phones Mobile Phones Portable Media Players Low Power Handheld Devices TYPICAL APPLICATION CIRCUIT VGPIO VGPIO bq25050 USB or Adaptor VBUS D+ DGND 1 R2 100kΩ CHG 8 OUT 10 STATUS IN C1 0.1uF VDD C2 1uF QBAT BGATE 9 7 CTRL BAT HOST 6 PACK+ 2 IMON 3 VSS TS 5 LDO 4 TEMP C4 0.1uF R1 1 kΩ PACK - VLDO C3 0.1uF ISENSE GPIO 1 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. Copyright © 2010, Texas Instruments Incorporated bq25050 SLUSA33 – MARCH 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. Precision integrated circuits may be more susceptible to damage because very small parametric changes could cause the device not to meet its published specifications. ORDERING INFORMATION PART NO. MARKING MEDIUM QUANTITY bq25050DQCR DAM Tape and Reel 3000 bq25050DQCT DAM Tape and Reel 250 PACKAGE DISSIPATION RATINGS TABLE PACKAGE RqJA RqJC TA < 25°C POWER RATING DERATING FACTOR ABOVE TA = 25°C 10 Pin 2mm × 3mm SON (1) 58.7°C/W (2) 3.9°C/W 1.70W 0.017W/°C (1) (2) Maximum power dissipation is a function of TJ(max), RqJA, and TA. The maximum allowable power dissipation at any allowable ambient temperature is PD = [TJ(max) - TA]/RqJA. This data is based on using the JEDEC High-K board and the exposed die pad is connected to a Cu pad on the board. The pad is connected to the ground plane by a 2×3 via matrix. ABSOLUTE MAXIMUM RATINGS (1) over operating free-air temperature range (unless otherwise noted) VALUE / UNIT IN (with respect to VSS) –0.3 to 30 V CTRL, TS, CHG, BGATE (with respect to VSS) –0.3 to 7 V Output Voltage BAT, OUT, LDO, CHG, BGATE, IMON (with respect to VSS) –0.3 to 7 V Input Current (Continuous) IN 1.2 A Output Current (Continuous) BAT 1.2 A Output Current (Continuous) LDO 100 mA Output Sink Current CHG Input Voltage 5 mA Junction temperature, TJ –40°C to 150°C Storage temperature, TSTG –65°C to 150°C (1) Stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under recommended operating conditions is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. All voltage values are with respect to the network ground terminal unless otherwise noted. RECOMMENDED OPERATING CONDITIONS over operating free-air temperature range (unless otherwise noted) IN voltage range VIN IN operating voltage range MIN MAX 3.55 28 4.4 10.2 UNITS V IIN Input current, IN 1 A IOUT Ouput Current in charge mode, OUT 1 A TJ Junction Temperature 125 °C 0 ELECTRICAL CHARACTERISTICS Over junction temperature range 0°C ≤ TJ ≤ 125°C and VIN = 5V (unless otherwise noted) PARAMETER TEST CONDITIONS MIN TYP MAX 3.25 3.30 3.55 UNITS INPUT VUVLO Under-voltage lock-out VIN: 0V → 4V VHYS-UVLO Hysteresis on UVLO VIN: 4V → 0V 2 Submit Documentation Feedback 250 V mV Copyright © 2010, Texas Instruments Incorporated Product Folder Link(s): bq25050 bq25050 www.ti.com SLUSA33 – MARCH 2010 ELECTRICAL CHARACTERISTICS (continued) Over junction temperature range 0°C ≤ TJ ≤ 125°C and VIN = 5V (unless otherwise noted) PARAMETER TEST CONDITIONS MIN TYP MAX 1.95 2.05 2.15 UNITS VBATUVLO Battery UVLO VBAT rising VHYS-BUVLO Hysteresis on BAT UVLO VBAT falling VIN-SLP Valid input source threshold VIN-SLP above VBAT Input power good if VIN > VBAT + VIN–SLP VBAT = 3.6V, VIN: 3.5V → 4V VHYS-INSLP Hysteresis on VIN-SLP VBAT = 3.6V, VIN: 4V → 3.5V 32 mV tDGL(NO-IN) Deglitch time, input power loss to charger turn-off Time measured from VIN: 5V → 2.5V 1µs fall-time 32 ms VOVP Input over-voltage protection threshold VIN: 5 V → 11 V VHYS-OVP Hysteresis on OVP VIN: 11 V → 5 V tDGL(OVP) Input over-voltage deglitch time tREC(OVP) Input over-voltage recovery time Time measured from VIN: 11V → 5V 1µs fall-time to LDO = HI, VBAT = 3.5V VIN_DPM Input DPM threshold VIN Falling, VIN-DPM enabled with CTRL 125 30 10.2 4.2 75 10.5 V mV 150 10.8 mV V 100 mV 100 µs 100 µs 4.30 4.4 V 120 150 µA 6 µA QUIESCENT CURRENT IBAT(PDWN) Battery current into BAT, No input connected VIN = 0V, VCHG = High, TS Enabled IBAT(DONE) BAT current, charging terminated VIN = 6V, VBAT > VBAT(REG) 10 µA IIN(STDBY) Standby current into IN pin CTRL = HI, VIN < VOVP 0.5 mA CTRL = HI, VIN ≥ VOVP 2 ICC Active supply current, IN pin VIN = 6V, no load on OUT pin, VBAT > VBAT(REG), IC enabled 3 VIN = 0V, VCHG = Low, TS Disabled, TJ = 85°C mA BATTERY CHARGER FAST-CHARGE VBAT(REG) Battery charge regulation voltage TA = 0°C to 125°C, IOUT = 50 mA TA = 25°C IIN(LIM) Input current limit (selected by CTRL interface) 4.16 4.20 4.23 4.179 4.200 4.221 4 pulses on CTRL 87 93 100 5 pulses on CTRL 174 187 200 6 pulses on CTRL 261 280 300 7 pulses on CTRL 348 374 400 8 pulses on CTRL 435 467 500 9 pulses on CTRL 608 654 700 10 pulses on CTRL 739 794 850 11 pulses on CTRL 864 935 1000 500 900 VDO(IN-OUT) VIN – VOUT VIN = 4.2V, IOUT = 0.75 A KIMON Input current monitor ratio KIMON = IIMON / ICHG, RIMON = 1kΩ, Current programmed using CTRL VIMON(MAX) Maximum IMON voltage IMON open IMON Accuracy 25 mA < IIN < 100 mA –25% 25% IIN = 100 mA to 1 A –8.5% 5% 1 1.2 V mA mV mA/A 1.25 V PRE-CHARGE AND CHARGE DONE VLOWV Pre-charge to fast-charge transition threshold tDGL1(LOWV) Deglitch time on pre-charge to fast-charge transition 25 ms tDGL2(LOWV) Deglitch time on fast-charge to pre-charge transition 25 ms IPRECHARGE Precharge current to BAT during precharge mode VBAT = 0V to 2.9V, Battery FET connected Default termination current threshold VIN = 5V, ICHARGE = 100 mA to 1 A ITERM External power path control disabled, BGATE = VSS 2.4 2.5 2.6 External power path control enabled 2.8 2.9 3.0 VBAT = 0V to 2.5V, BGATE = VSS, Input current limit regulated to IPRECHARGE 28 37 45 41.5 45 48.5 7.5 10.5 13.5 VBAT(REG) –0.13V VBAT(REG) –0.1V VBAT(REG) –0.065V V mA %ICHG RECHARGE OR REFRESH VRCH Recharge detection threshold VBAT falling Submit Documentation Feedback Copyright © 2010, Texas Instruments Incorporated Product Folder Link(s): bq25050 V 3 bq25050 SLUSA33 – MARCH 2010 www.ti.com ELECTRICAL CHARACTERISTICS (continued) Over junction temperature range 0°C ≤ TJ ≤ 125°C and VIN = 5V (unless otherwise noted) PARAMETER tDGL(RCH) TEST CONDITIONS MIN Deglitch time, recharge threshold detected TYP MAX 25 UNITS ms EXTERNAL POWER PATH CONTROL VOUT(REG) Output regulation voltage VBAT ≤ 2.9 V 2.9 V < VBAT ≤ 3.6V VBAT > 3.6 V 3.4 3.5 3.6 V 3.44 3.59 3.75 V VBAT + Vdrop(QBAT) V VSUPP1 Enter supplement mode threshold VBAT = 3.4 V, VOUT Falling VOUT ≤ VBAT -60mV V VSUPP2 Exit supplement mode threshold VBAT = 3.4 V, VOUT Rising VOUT ≥ VBAT-20mV V VLDO LDO Output Voltage VIN = 5.5V, ILDO = 0mA to 50mA ILDO Maximum LDO Output Current VDO Dropout Voltage LDO 4. 4.9 5.1 60 VIN = 4.5V, ILDO = 50mA V mA 200 300 mV CTRL INTERFACE tCTRL-DGL CTRL Deglitch timer 5 tCTRL-LATCH CTRL Latch timer 2 ms tCTRL-HIGH High Duration on CTRL 50 1000 tCTRL-LOW Low Time Duration on CTRL 50 1000 RPULLDOWN CTRL Pulldown Resistor ms 260 ms µs kΩ LOGIC LEVELS ON CTRL, CHG, BGATE VIL Logic LOW input voltage VIH Logic HIGH input voltage 0.4 1.4 V V BATTERY-PACK NTC MONITOR (TS) VTS_CLAMP Maximum TS Voltage ITS-0C Current source for 0°C TS sensing 1.5 V 3.75 4 4.25 µA ITS Current source for 45°C and 60°C TS sensing 19 20 21 µA VCOLD TS Cold Threshold, when BGATE is disabled VTS < VCOLD to begin charge (Corresponds to 0°C, 2°C, 4°C (1) 0.55 0.575 0.600 V VCUTOFF_0 TS Cold Cutoff Threshold Temp falling (Corresponds to –1°C, 1°C, 3°C (1) (2)) 0.575 0.600 0.625 V VHOT_45 TS Hot Threshold (0°C to 45°C), when BGATE is disabled VTS > VHOT_45 to begin charge, 0°C to 45°C thresholds selected. (Corresponds to 40°C, 42°C, 44°C (1) (2)) 0.44 0.45 0.46 V VCUTOFF_45 TS Hot Cutoff Threshold (0°C to 45°C) Temp rising (Corresponds to 45°C, 47°C, 49°C (1) (2)) 0.365 0.375 0.385 V VHOT_60 TS Hot Threshold (0°C to 60°C), when BGATE is disabled VTS > VHOT_60 to begin charge, 0°C to 60°C thresholds selected, Temp rising (Corresponds to 54.5°C, 57°C, 60°C (1) 0.240 0.250 0.258 V VCUTOFF_60 TS Hot Cutoff Threshold (0°C to 60°C) Temp rising. (Corresponds to 58.5°C, 61.5°C, 64°C (1) (2)) 0.204 0.213 0.223 V V-20 –20°C TS Voltage See (1) 0.968 V80 +80°C TS Voltage See (1) 0.110 tdgl(TS) Deglitch for TS Fault Fault detected on TS to stop charge VOL Output LOW voltage ISINK = 5 mA IIH Leakage current V/CHG = 5 V tFLSH(TS) TS fault flash period 50% Duty Cycle, TS out of valid range 100 ms (2) ) (2) ) V V 25 ms CHG OUTPUT 0.45 V 1 µA THERMAL REGULATION TJ(REG) Temperature Regulation Limit TJ rising 125 °C TJ(OFF) Thermal shutdown temperature TJ rising 155 °C (1) (2) 4 Information is based on using the NCP15WB473F NTC thermistor. Temperature references give design guidance only, actual absolute temperatures are not guaranteed. Submit Documentation Feedback Copyright © 2010, Texas Instruments Incorporated Product Folder Link(s): bq25050 bq25050 www.ti.com SLUSA33 – MARCH 2010 ELECTRICAL CHARACTERISTICS (continued) Over junction temperature range 0°C ≤ TJ ≤ 125°C and VIN = 5V (unless otherwise noted) PARAMETER TJ(OFF-HYS) Thermal shutdown hysteresis TEST CONDITIONS TJ falling MIN TYP MAX 20 Submit Documentation Feedback Copyright © 2010, Texas Instruments Incorporated Product Folder Link(s): bq25050 UNITS °C 5 bq25050 SLUSA33 – MARCH 2010 www.ti.com DEVICE INFORMATION SIMPLIFIED BLOCK DIAGRAM LDO + Q1 Q2 OUT VIN Precharge Current Source + IMON + 125C TJ Charge Pump 1.5V + IIN(REG) External Power Path Control Mode 2.9V BAT VOUT(REG) + VIN_DPM + Charge Pump VOUT(MIN) ILIM TERMINATION COMPARATOR BGATE + VREF + VOUTMIN 150mV VIN-DPM Enable External Power Path Control Mode Sleep Comparator 75mV VBAT + CTRL Digital Decode CHARGE CONTROL 260k OVP Comparator + VIN VOUTMIN Enable Comparator VBAT 3.5V + VOVP V IN TS Current VREF Source Control STATUS OUTPUT DISABLE + VREF + /CHG TS COLD TS HOT TS VSS 6 Submit Documentation Feedback Copyright © 2010, Texas Instruments Incorporated Product Folder Link(s): bq25050 bq25050 www.ti.com SLUSA33 – MARCH 2010 PIN CONFIGURATION IN 1 10 IMON 2 9 BGATE VSS 3 8 CHG OUT bq 25050 LDO 4 7 CTRL TS 5 6 BAT 10-pin 2mm x 3mm SON PIN FUNCTIONS PIN NAME NO. I/O DESCRIPTION IN 1 I Input power supply. IN is connected to the external DC supply (AC adapter or USB port). Bypass IN to VSS with at least a 0.1µF ceramic capacitor. IMON 2 O Current monitoring output. Connect a 1kΩ resistor from IMON to VSS to monitor the input current. The voltage at IMON ranges from 0V to 1V which corresponds to an input current from 0A to 1A. VSS 3 – Ground terminal. Connect to the thermal pad and the ground plane of the circuit. LDO 4 O LDO output. LDO is regulated to 4.9V and drives up to 50mA. Bypass LDO to VSS with a 0.1µF ceramic capacitor. LDO is enabled when VUVLO < VIN < VOVP. TS 5 I Battery pack NTC monitoring input. Connect the battery pack 47-kΩ NTC from TS to VSS to monitor battery pack temperature. The default pack temperature range is 0°C to 45°C thresholds. CTRL 7 I Single-input interface Input. Drive CTRL with pulses to enable/disable the device, enable/disable VIN-DPM, select battery temperature range and select current limits. See the interface section for details on using the CTRL interface. CHG 8 I/O Charge status indicator open-drain output. CHG is pulled low while the device is charging the battery. CHG goes high impedance when the battery is fully charged and does not indicate subsequent recharge cycles. CHG pulses to indicate TS faults. BAT 6 O BGATE 9 I/O Battery P-Channel FET gate drive output. Connect BGATE to the gate of the external P-Channel FET that connects the battery to OUT. Connect BGATE to VSS if the external FET is not used. No external capacitor is recommended from BGATE to GND. OUT 10 O System output connection. OUT supplies the system with a minimum voltage of 3.4V (min.) to ensure system operation whenever an input adapter is connected regardless of the battery voltage. Bypass OUT to VSS with a 1µF ceramic capacitor. Pad – There is an internal electrical connection between the exposed thermal pad and the VSS pin of the device. The thermal pad must be connected to the same potential as the VSS pin on the printed circuit board. Do not use the thermal pad as the primary ground input for the device. VSS pin must be connected to ground at all times. Thermal PAD Battery connection output. BAT is the sense input for the battery as well as the precharge current output. Connect BAT to the battery and bypass BAT to VSS with a 0.1µF ceramic capacitor. Submit Documentation Feedback Copyright © 2010, Texas Instruments Incorporated Product Folder Link(s): bq25050 7 bq25050 SLUSA33 – MARCH 2010 www.ti.com APPLICATION CIRCUITS VGPIO VGPIO bq25050 USB or Adaptor VBUS D+ DGND 1 R2 100kΩ CHG 8 OUT 10 STATUS IN C1 0.1uF VDD C2 1uF QBAT BGATE 9 7 CTRL BAT 6 TS 5 HOST PACK+ 2 TEMP C4 0.1uF IMON R1 1 kΩ PACK - 3 VSS LDO 4 VLDO C3 0.1uF ISENSE GPIO Figure 1. Typical Application Circuit Using the External Power Path Control Feature VGPIO VGPIO bq25050 USB or Adaptor VBUS D+ DGND 1 R2 100kΩ CHG 8 OUT 10 STATUS IN C1 0.1uF VDD C2 1uF 7 CTRL BGATE 9 BAT 6 TS 5 HOST PACK+ 2 TEMP IMON R1 1 kΩ PACK - 3 VSS LDO 4 VLDO C3 0.1uF ISENSE GPIO Figure 2. Typical Application Circuit Disabling the External Power Path Control Feature 8 Submit Documentation Feedback Copyright © 2010, Texas Instruments Incorporated Product Folder Link(s): bq25050 bq25050 www.ti.com SLUSA33 – MARCH 2010 TYPICAL CHARACTERISTICS Using circuit in Figure 1, TA = 25°C, unless otherwise specified ADAPTER INSERTION ENABLE USING CTRL CTRL 2 V/div VIN = 0 V - 5 V, VBAT = 3.3 V, ICHG = 280 mA VIN = 5 V, VBAT = 3 V, ICHG = 280 mA CHG 2 V/div VIN 5 V/div BGATE 2 V/div BGATE 2 V/div LDO 2 V/div ICHG 0.5 A/div IIN 100 mA/div 20 ms/div 10 ms/div Figure 3. Figure 4. DISABLE USING CTRL CONTROL CURRENT LIMIT - STEP UP CTRL 2 V/div LDO 2 V/div CTRL 2 V/div VIN = 5 V, VBAT = 3.4 V, ICHG = 280 mA VIN = 5 V, VBAT = 3.4 V, ICHG = 93 mA to 935 mA BGATE 2 V/div IMON 500 mV/div BGATE 2 V/div IBAT 0.5 A/div IIN 2 mA/div 1 ms/div 5 ms/div Figure 5. Figure 6. CONTROL CURRENT LIMIT - STEP DOWN BGATE FORCED ON CTRL 2 V/div VIN = 5 V, VBAT = 3.4 V, ICHG = 935 mA to 93 mA CTRL 2 V/div VBAT 2 V/div Offset 4.1 V VOUT 2 V/div Offset 4.1 V BGATE 2 V/div BGATE 2 V/div IMON 500 MV/div IBAT 500 mA/div VIN = 5 V, VBAT = 4.18 V, VBAT(REG) = 4.2 V 5 ms/div 1 ms/div Figure 7. Figure 8. Submit Documentation Feedback Copyright © 2010, Texas Instruments Incorporated Product Folder Link(s): bq25050 9 bq25050 SLUSA33 – MARCH 2010 www.ti.com TYPICAL CHARACTERISTICS (continued) Using circuit in Figure 1, TA = 25°C, unless otherwise specified CANCEL BGATE FORCED ON INPUT OVP VIN 10 V/div CTRL 2 V/div VIN = 5 V to 29 V, VBAT = 3.8 V VBAT 2 V/div Offset 4.1 V VOUT 2 V/div Offset 4.1 V VBAT 2V/div LDO 2 V/div BGATE 2 V/div VIN = 5 V, VBAT = 4.18 V, VBAT(REG) = 4.2 V IBAT 0.5 A/div 1 ms/div 50 µs/div Figure 9. Figure 10. PRE-CHARGE MODE TO MINIMUM OUTPUT REGULATION MODE MINIMUM OUTPUT REGULATION MODE TO CONSTANT CURRENT (CC) MODE VIN = 5 V, VBAT = 1.8 V to 3.45 V, ICHG = 467 mA VIN = 5 V, VBAT = 2.4 V to 3.6 V, ICHG = 467 mA VBAT 500 V/div VBAT 500 V/div IMON 500 mV/div IMON 500 mV/div BGATE 2 V/div BGATE 2 V/div IBAT 500 mA/div IBAT 500 mA/div 20 ms/div 20 ms/div Figure 11. Figure 12. PRE-CHARGE TO CONSTANT VOLTAGE (CV) MODE VIN-DPM VIN 2 V/div VBAT 500 mV/div IMON 500 mV/div VIN = 5 V, VBAT = 2.8 V to 4.18 V, ICHG = 467 mA IIN 500 mA/div IMON 500 mV/div BGATE 2 V/div BGATE 2 V/div IBAT 500 mA/div 20 ms/div 200 µs/div Figure 13. 10 VIN = 5 V with current limit of 600 mA, VBAT = 3.2 V, ICHG = 93 mA to 935 mA Figure 14. Submit Documentation Feedback Copyright © 2010, Texas Instruments Incorporated Product Folder Link(s): bq25050 bq25050 www.ti.com SLUSA33 – MARCH 2010 TYPICAL CHARACTERISTICS (continued) Using circuit in Figure 1, TA = 25°C, unless otherwise specified SUPPLEMENT MODE CHARGE CYCLE DEMO VOUT 2 V/div IMON 1 V/div VBAT 2 V/div BGATE 1 V/div VIN = 5 V, ICHG = 280 mA, BGATE =Enabled, CBAT = 2000 µF, No battery connected, RDSon from IN to OUT IIN 100 mA/div VOUT 2 V/div IOUT 2 A/div BGATE 2 V/div VIN = 5 V, VBAT = 3.2 V, ICHG = 935 mA, IOUT = 0 A to 2 A 20 ms/div 100 µs/div Figure 15. Figure 16. BATTERY VOLTAGE vs CHARGE CURRENT RDSON (From IN to OUT) vs JUNCTION TEMPERATURE 4.24 1.20 CV Mode Iload = 500 mA 4.23 1.00 4.22 RDSON - W VBAT - Battery Voltage - V 0.80 4.21 4.20 0.60 4.19 0.40 4.18 0.20 4.17 4.16 0 200 400 600 800 1000 0.00 -50 ICHRG - Charge Current - mA Figure 17. 0 50 100 TJ - Junction Temperature - °C 150 Figure 18. Submit Documentation Feedback Copyright © 2010, Texas Instruments Incorporated Product Folder Link(s): bq25050 11 bq25050 SLUSA33 – MARCH 2010 www.ti.com TYPICAL CHARACTERISTICS (continued) Using circuit in Figure 1, TA = 25°C, unless otherwise specified INPUT CURRENT LIMIT vs INPUT VOLTAGE OUTPUT VOLTAGE vs CHARGE CURRENT 4.00 1000 VBAT = 3 V 900 3.90 Dropout Thermal Regulation 3.80 700 VOUT - Output Voltage - V IINLIM - Input Current Limit - mA 800 600 500 400 300 3.70 3.60 3.50 3.40 3.30 200 3.20 100 3.10 0 4 5 6 7 8 9 10 11 External Power Path Control Mode VBAT = 3 V 3.00 0.000 VIN - Input Voltage - V 0.200 0.400 0.600 0.800 1.000 ICHRG - Charge Current - mA Figure 19. Figure 20. DETAILED FUNCTIONAL DESCRIPTION The bq25050 is a highly integrated Li-Ion linear battery charger targeted at space-limited portable applications. It operates from either a USB port or AC Adapter and charges a single-cell Li-Ion battery with up to 1A of charge current. The 30V input voltage range with input over-voltage protections supports low-cost unregulated adapters. The bq25050 has a single power output that charges the battery. The system load is connected to OUT. The low-battery system startup circuitry maintains OUT pin voltage at VOUT(REG) whenever an input source is connected. This allows the system to start-up and run whenever an input source is connected regardless of the battery voltage. The charge current is programmable up to 1A using the CTRL input. Additionally, a 4.9V 50mA LDO is integrated into the IC for supplying low power external circuitry. External FET Controller (BGATE) The External Power Path Control feature is implemented using the BGATE output. BGATE is also used to enable/ disable the External Power Path Control feature. When power is first applied to either VBAT or VIN on the bq25050, the BGATE output is tested. If the BGATE pin is connected to VSS, the External Power Path Control feature is disabled. In order to enable the External Power Path Control feature after it has been disabled, the battery and the input source must be removed and reconnected and BGATE must NOT be connected to VSS. With External Power Path Control enabled, BGATE is used to drive an external P-channel MOSFET that connects the battery to the system output. This state of this MOSFET is dependant on the battery voltage and the IC status. In discharge mode, BGATE is pulled to GND to turn the MOSFET on fully. During discharge mode, the output is connected directly to the battery. Discharge mode is entered under the following conditions: 1. IC disabled or no input power 2. Supplement mode 3. "Force On" – enabled through CTRL When not in one of these conditions, the BGATE output is controlled by the bq25050 and changes depending on which mode is required. See the Charging Operation section for more details. 12 Submit Documentation Feedback Copyright © 2010, Texas Instruments Incorporated Product Folder Link(s): bq25050 bq25050 www.ti.com SLUSA33 – MARCH 2010 Enable/ Disable External Power Path Control When power is first applied to the bq25050, either at the IN or BAT input, the bq25050 checks the BGATE output. The device sources a small current out of BGATE for 32ms and monitors the voltage. If VBGATE is connected to ground and the voltage does not rise above logic High, the External Power Path Control feature is disabled and VLOWV is set to 2.5V. If the BGATE voltage rises above logic High, the External Power Path Control feature is enabled and VLOWV is set to 2.9V. The bq25050 only does this check when power is initially applied. Power must removed from IN and BAT and then reapplied to initiate another check. Figure 21 illustrates the startup check procedure. No Input Source or Battery Connected Input source OR Battery connected? NO YES Source Current to BGATE BGATE = VSS? YES External Power Path Control Disabled V LOWV = 2.5V NO External Power Path Control Enabled VLOWV = 2.9V Figure 21. BGATE Monitor Sequence Charging Operation The bq25050 charges a battery in 3 stages while maintaining a minimum system output. When the bq25050 is enabled by CTRL, the battery voltage is monitored to verify which stage of charging must be used. The bq25050 charges in precharge mode, minimum output regulation mode, or normal CC/CV mode based on the battery voltage. Submit Documentation Feedback Copyright © 2010, Texas Instruments Incorporated Product Folder Link(s): bq25050 13 bq25050 SLUSA33 – MARCH 2010 www.ti.com Charger Operation with External Power Path Control Mode Enabled PRECHARGE 4.2V CC FAST CHARGE Maximum Charge Current (ILIM ) CV TAPER System Voltage IFASTCHG 3.5V VLOWV Battery Voltage IPRECHG CHG = Hi -Z ITERM Figure 22. Typical Charging Cycle with External Power Path Control Enabled Precharge Mode (VBAT ≤ VLOWV) The bq25050 enters precharge mode when VBAT ≤ VLOWV. Upon entering precharge mode, the battery is charged with a 40mA current source and /CHG goes low. During precharge mode, VOUT is regulated to 3.5V and the battery is charged from the internal fixed 40mA current source connected to the BAT output. With BGATE connected to GND, the system output is connected to the battery and therefore the system voltage is equal to the battery voltage. Minimum Output Regulation Mode (2.9V
BQ25050DQCR
物料型号:bq25050 器件简介:bq25050是德州仪器(Texas Instruments)生产的一款高度集成的线性锂离子电池充电器,专为空间受限的便携式应用设计。它可从USB端口或交流适配器操作,以高达1A的充电电流为单节锂离子电池充电。输入电压范围为30V,并具有输入过电压保护,支持低成本未调节的适配器。

引脚分配:bq25050采用10引脚2mm x 3mm的SON封装,具体引脚功能如下: - IN:输入电源 - IMON:电流监测输出 - VSS:地终端 - LDO:LDO输出 - TS:电池包NTC监测输入 - CTRL:单输入接口输入 - CHG:充电状态指示开漏输出 - BAT:电池连接输出 - BGATE:电池P沟道FET门驱动输出 - OUT:系统输出连接

参数特性: - 30V输入额定值,具有10.5V过电压保护(OVP) - 外部电池FET的FET控制器用于外部电源路径控制 - 集成的50mA低压降线性调节器(LDO) - 可通过单输入接口编程的充电电流 - 0.5%电池电压调节精度 - 7%充电电流调节精度 - 热调节和保护 - 充电和放电期间的电池NTC监测 - 充电/完成和温度故障的状态指示

功能详解: - bq25050在充电过程中有三个阶段:调节、恒流和恒压。在所有充电阶段,内部控制回路都会监控IC结温,并在超过内部温度阈值时减少充电电流。 - 充电器具有高精度的电流和电压调节回路、充电状态显示和充电终止功能。

应用信息: - 适用于智能手机、移动电话、便携式媒体播放器和低功耗手持设备。

封装信息: - 小型10引脚2mm x 3mm SON封装,具有热垫以提供芯片与印刷电路板(PCB)之间的有效热接触。
BQ25050DQCR 价格&库存

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BQ25050DQCR
  •  国内价格 香港价格
  • 1+14.863221+1.84378
  • 10+10.5110910+1.30390
  • 25+9.4216025+1.16875
  • 100+8.22466100+1.02027
  • 250+7.65395250+0.94947
  • 500+7.30949500+0.90674
  • 1000+7.025991000+0.87157

库存:18302