MP2631 28V, 1A, Li-lon, Linear Battery Charger with 10mA High Voltage LDO The Future of Analog IC Technology DESCRIPTION FEATURES The MP2631 is a linear, high performance single cell Li-Ion or Li-Polymer battery charger with 10mA LDO. By integrating high voltage input protection into the charger IC, the MP2631 can tolerate an input surge up to 28V. The internal 5V LDO can be used as a system watchdog supply to monitor charge status. The LDO is ON when the input voltage is greater than 3V and less than 7V, and remains ON when the MP2631 is in SHDN mode. When input is higher than 7.0V, the LDO output will be cut off from the input. When input is lower than 5V, the LDO will work in the dropout region. The device features constant current (CC) and constant voltage (CV) charging modes with programmable charge current (200mA to 1A), auto-recharge and trickle charge. MP2631 provides ACOK and charge status indications to the system. The OVP circuitry will automatically disconnect both charger and LDO from input when VIN exceeds 7V. For guaranteed safe operation, the MP2631 limits the die temperature to a preset value when the device is heated up due to limited PCB space. MP2631 is available in 10-pin 3mm x 3mm QFN package. • Complete Solution for Charging Single-Cell Li-Ion Battery Input Surge Protection Up to 28V 5V LDO output 3V to 7V Input Operating Range Programmable Charge Current: 200mA to 1A Termination and auto-recharge 0.75% VBATT Accuracy over Temperature <1µA Battery Reverse Current Automatic die temperature limiting Fault and Charge Status Indicators External Soft-Start to Control Inrush Current 3mm x 3mm QFN Package • • • • • • • • • • • APPLICATIONS • • • • • Cell Phones Digital Cameras Smart Phones PDAs MP3 Players “MPS” and “The Future of Analog IC Technology” are Registered Trademarks of Monolithic Power Systems, Inc. TYPICAL APPLICATION CIRCUIT U1 5-6.5V 1 VIN GND 35V LED1 Green R1 1K R2 1K LED2 Red 2 C6 3 ACOK LDO SS BAT 9 BAT ACK ISET 8 GND 4 SHDN 10 MP2631DQ C5 NS CHG LDO IN C1 C3 NS 6 CHG SHDN NC GND 7 R5 R4 R3 1.96K 3.09K 7.68K 1% 1% 1% 5 JP1 MP2631 Rev.0.9 9/15/2008 JP2 JP3 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2008 MPS. All Rights Reserved. 1 MP2631–28V, 1A LINEAR LI-ION BATTERY CHARGER WITH 10MA HIGH VOLTAGE LDO ABSOLUTE MAXIMUM RATINGS (1) PACKAGE REFERENCE TOP VIEW IN 1 10 LDO SS/NC 2 9 BATT ACOK 3 8 ISET CHG 4 7 NC GND 5 6 SHDN MP2631DQ * Recommended Operating Conditions (2) Nominal Supply Voltage VIN............ 3.5V to 5.5V Operating Temperature .............–40°C to +85°C Thermal Resistance EXPOSED PAD ON BACKSIDE Part Number* IN to GND ...................................... –0.3V to 28V All Other Pins to GND................. –0.3V to +6.5V Junction Temperature...............................140°C Lead Temperature ....................................260°C Storage Temperature ..............–65°C to +150°C (3) θJA θJC 3x3 QFN10 ............................. 50 ...... 12... °C/W Package QFN10 (3mm x 3mm) Temperature –40°C to +85°C For Tape & Reel, add suffix –Z (eg. MP2631DQ–Z) For RoHS compliant packaging, add suffix –LF (eg. MP2631DQ–LF–Z) Notes: 1) Exceeding these ratings may damage the device. 2) The device is not guaranteed to function outside of its operating conditions. 3) Measured on approximately 1” square of 1 oz copper. ELECTRICAL CHARACTERISTICS VIN = 5.2V, VEN = 0V, TA = +25°C, unless otherwise noted. Parameter Input Quiescent Current Symbol Condition SHDN= Low, VBATT=4.25V, ISUPPLY ILDO = 0A, VIN ≥ 5.2V Min Typ Max 950 Units µA Battery Voltage Regulation VBATT T = –5°C to +75°C, IBATT = 0 4.16 4.20 4.24 V LDO OUT VOUT Iout = 0 - 10mA, Vin = 5.0 – 6.5 V 4.85 5.0 5.15 V Min LDO Output Voltage VOUT_MIN I=2mA, Vin=5.0V LDO Load Regulation 4.85 Load < 10mA LDO Short Current Limit OVP Threshold Constant Current Regulation ICHG Constant Current Variation Trickle Current Trickle Threshold Voltage Trickle Voltage Hysteresis IBF Threshold OVP Threshold IBF OVP MP2631 Rev.0.9 9/15/2008 0.005 V/mA 80 mA Input rising 6.7 7.0 7.3 V VBATT = 3.8V RCHG = 3.3k 475 530 585 mA VBATT = 3.8V, TJ = 0°C to +120°C, VBATT = 2.3V VBATT rising 87 100 113 %ICHG(4) 5 2.45 15 2.75 In CV mode Vin rising 5 6.7 10 2.6 100 10 7 %ICHG(4) V mV %ICHG V OVP Hysteresis UVLO V 15 7.3 400 Vin rising 1.6 2.1 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2008 MPS. All Rights Reserved. mV 2.5 V 2 MP2631–28V, 1A LINEAR LI-ION BATTERY CHARGER WITH 10MA HIGH VOLTAGE LDO ELECTRICAL CHARACTERISTICS (continued) VIN = 5.2V, VEN = 0V, TA = +25°C, unless otherwise noted. Parameter Symbol Condition Min UVLO Hysteresis Typ Max 150 SHDN Trip Threshold High V SHDN Trip Threshold Low 0.4 Pin Voltage = 0.2V Battery Reverse Current to BATT Pin SHDN = Low and Input = Floating or 0V Soft Thermal Shutdown Threshold Soft Thermal Shutdown Hysteresis Tlim 4 105 From trickle to 90% of full current, (Css absent) Soft-Start Time Recharge Voltage Threshold Recharge Voltage Hysteresis mV 1.5 CHG , ACOK Sink Current VRECHARGE VBATT falling from 4.2V 3.9 Units V mA 120 1 µA 135 °C 10 °C 300 us 4.0 4.1 100 V mV Notes: 4) ICHG is the target preprogrammed charge current (Die temperature below 110°C). 5) IBF is the target preprogrammed battery full current threshold. PIN FUNCTIONS Pin # Name 1 IN 2 SS/NC 3 ACOK 4 CHG 5 GND Exposed Pad 6 SHDN 7 NC 8 ISET 9 BATT Used for Charger Termination. An input “Low” signal at this pin or if the pin floating will enable the charger. No Connection Constant Charge Current Program pin. Connect this pin to an external resistor to program the charging current in CC Mode. Charger Output 10 LDO LDO output MP2631 Rev.0.9 9/15/2008 Description Input Supply Pin. IN receives the AC adapter or USB supply voltage. Soft Start Pin. If it is left open, internal fixed SS is operated and the charger will not charge a battery when its initial voltage is higher than the recharge threshold (4.0V). Open-Drain Input Fault Indicator. This pin is low when 2.1V < Vin < 7.0V Open-Drain Charge Indicator. This pin is low during charging, is High after battery full or termination. Ground. Exposed pad and GND pin must be connected to same ground plane www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2008 MPS. All Rights Reserved. 3 MP2631–28V, 1A LINEAR LI-ION BATTERY CHARGER WITH 10MA HIGH VOLTAGE LDO TYPICAL PERFORMANCE CHARACTERISTICS C1=4.7uF, C2=0.1uF, C4=2.2uF, VIN=5V, TA=25ºC, unless otherwise noted. 700 3.5 600 3.0 500 2.5 400 2.0 300 1.5 200 1.0 ICHG 20 ICHG=0.8A ICHG=0.5A 400 ICHG=0.2A 0 0 1.0 Charge Current vs Input Voltage 1200 ICHG (mA) 1000 0.7 VBAT=4V 800 VBAT=4.1V 2.0 3.0 VBAT (V) 4.0 3.0 3.3 3.6 3.9 4.2 VBAT (V) 1/RSET vs. ISET Trickle Charge Curve 120 0.3 400 ICHG=0.2A 0 2.7 5.0 0.4 600 ICHG=0.5A 400 0.5 0.2 100 ICHG=100mA 80 ICHG=80mA 60 ICHG=50mA 40 ICHG=20mA 20 0.1 0 4.3 4.4 4.5 4.6 4.7 4.8 4.9 5.0 VIN (V) VBAT=3.8V 0 200 300 400 500 600 700 800 900 1000 ISET (mA) 0 0 0.5 1.0 1.5 2.0 2.5 VBAT (V) LDO Load Regulation LDO Voltage Dropout 50 5 .1 0 45 40 5 .0 5 35 30 5 .0 0 VOUT (V) VDROPOUT (mV) 600 0.6 200 25 20 4 .9 5 4 .9 0 15 10 5 0 800 200 200 0 40 60 80 100 120 140 CHARGE TIME (Min) ICHG=0.8A Thermal Protection 800 600 ICHG=1A 1000 ICHG (mA) 0 1200 ICHG=1A 1000 0.5 100 0 1200 ICHG (mA) 4.0 IREV (mA) 4.5 800 ICHG (mA) 900 VBAT Charge Current vs Battery Voltage Charge Current vs Battery Voltage VBAT (V) ICHG (mA) Battery Charge Curve 4 .8 5 4 .8 0 0 2 4 6 8 LOAD CURRENT (mA) MP2631 Rev.0.9 9/15/2008 10 VIN=5V 0 2 4 6 8 10 LOAD CURRENT (mA) www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2008 MPS. All Rights Reserved. 4 MP2631–28V, 1A LINEAR LI-ION BATTERY CHARGER WITH 10MA HIGH VOLTAGE LDO TYPICAL PERFORMANCE CHARACTERISTICS (continued) C1=4.7uF, C2=0.1uF, C4=2.2uF, VIN=5V, TA=25ºC, unless otherwise noted. 1400 5.2 1200 5.0 1000 4.8 800 4.6 600 4.4 400 4.2 4.5 4.9 5.3 5.7 6.1 6.5 200 1.0 Current Charge vs. Temperature 4.10 560 4.06 550 4.02 540 3.98 530 3.94 -10 20 50 80 2.0 110 3.90 -40 -10 20 VIN 5V/div. VCHG 5V/div. VIN 5V/div. VCHG 5V/div. VIN 5V/div. VCHG 5V/div. VBAT 5V/div. VBAT 5V/div. VOUT 5V/div. IIN 0.2A/div. IIN 0.2A/div. IIN 10mA/div. MP2631 Rev.0.9 9/15/2008 2.5 3.0 3.5 4.0 VBAT vs. Temperature 570 520 -40 1.5 50 80 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2008 MPS. All Rights Reserved. 110 5 MP2631–28V, 1A LINEAR LI-ION BATTERY CHARGER WITH 10MA HIGH VOLTAGE LDO TYPICAL PERFORMANCE CHARACTERISTICS (continued) C1=4.7uF, C2=0.1uF, C4=2.2uF, VIN=5V, TA=25ºC, unless otherwise noted. Recovery Input Voltage (LDO) VIN=6.6V, VO=5V, IO=5mA VIN 5V/div. VCHG 5V/div. VIN 5V/div. VSHDN 5V/div. VIN 5V/div. VSHDN 5V/div. VOUT 5V/div. VBAT 5V/div. VBAT 5V/div. IIN 10mA/div. ICHG 0.5A/div. ICHG 0.5A/div. 200ms/div. 100ms/div. Power Ramp Up vs. Battery Charge Power Ramp Down vs. Battery Charge VBAT=4.1V, CSS=0.1uF VBAT=4.1V, CSS=0.1uF VIN 5V/div. VCHG 5V/div. VIN 5V/div. VCHG 5V/div. VBAT 5V/div. VBAT 5V/div. ICHG 0.2A/div. ICHG 0.2A/div. 10ms/div. VIN 5V/div. VCHG 5V/div. VIN 5V/div. VCHG 5V/div. VBAT 5V/div. VBAT 5V/div. ICHG 0.5A/div. ICHG 0.5A/div. 10ms/div. MP2631 Rev.0.9 9/15/2008 10ms/div. 10ms/div. www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2008 MPS. All Rights Reserved. 6 MP2631–28V, 1A LINEAR LI-ION BATTERY CHARGER WITH 10MA HIGH VOLTAGE LDO BLOCK DIAGRAM VIN IN LDO RS RS SS/NC BATTERY CHARGE CONTROL ACOK I Battery ISET RPGM CHG SHDN GND Figure 1—Functional Block Diagram Charge Cycle (Mode Change: Trickle->CC-> CV) Figure 2 below shows the typical charging profile for the MP2631. It begins charging at the constant current of the programmed value (ICHG). This is referred to as Constant Current (CC) mode. For a deeply discharged battery, it will start trickle at 10% of the programmed charge current until battery voltage reaches 2.6V. Once the battery voltage reaches 4.2V, the charger will operate in the constant voltage (CV) charge mode. The charge current drops during CV mode, and the battery full indication is set when the charge current reduces to the battery full value (IBF) at 10% of the nominal charge current. OPERATION Input Voltage Range The MP2631 has built-in input voltage surge protection as high as +28V. The charger IC will be automatically disabled when the input voltage is lower than 2.1V or higher than 7.0V. For MP2631, the open-drain pin ACOK is used to indicate an input power good condition (i.e. 3.5V<VIN<6.5V). If the input voltage is lower than the battery voltage, the charge function is also disabled to prevent the battery from draining. IBATT CC Charging ICHG CV Charging 10% of ICHG Trickle Charging Charging Complete VBATT 2.6V 4.2V Figure 2—MP2631 Typical Charging Profile MP2631 Rev.0.9 9/15/2008 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2008 MPS. All Rights Reserved. 7 MP2631–28V, 1A LINEAR LI-ION BATTERY CHARGER WITH A 10MA HIGH VOLTAGE LDO Programming of Charge Current and Battery Full Current The charge current (ICHG) is set by a resistor (RPGM) connecting from the ISET pin to GND. The relationship of the charge current and the programming resistance is established by the following table and graph. Table 1—RPGM and ICHG Relationship RPGM (kΩ) 1.55 1.72 1.94 2.21 2.58 3.1 3.87 5.16 7.75 15.5 LDO Operation The on-chip current limited LDO will regulate its output at 5V for the input voltage from 5.1V to 6.5V. When VIN is below 5.1V, it will work in the dropout mode. LDO is always ON no matter what state of SHDN is, unless OVP is reached. It can handle a maximum load of 10mA. A 0.1uF -1uF cap at the output is recommended. ICHG (mA) 1000 900 800 700 600 500 400 300 200 100 The open-drain pin CHG is used to indicate charging status. When the battery full condition is reached or any other condition prevents the charger from charging, CHG will become floating and the charge function is terminated. The charger will begin recharging when the battery voltage is reduced to 4.0V due to any kind of leakage. MP2631 Rev.0.9 9/15/2008 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2008 MPS. All Rights Reserved. 8 MP2631–28V, 1A LINEAR LI-ION BATTERY CHARGER WITH A 10MA HIGH VOLTAGE LDO PACKAGE INFORMATION QFN10 (3mm x 3mm) 2.90 3.10 0.30 0.50 PIN 1 ID MARKING 0.18 0.30 2.90 3.10 PIN 1 ID INDEX AREA 1.45 1.75 PIN 1 ID SEE DETAIL A 10 1 2.25 2.55 0.50 BSC 5 6 TOP VIEW BOTTOM VIEW PIN 1 ID OPTION A R0.20 TYP. PIN 1 ID OPTION B R0.20 TYP. 0.80 1.00 0.20 REF 0.00 0.05 SIDE VIEW DETAIL A NOTE: 2.90 0.70 1) ALL DIMENSIONS ARE IN MILLIMETERS. 2) EXPOSED PADDLE SIZE DOES NOT INCLUDE MOLD FLASH. 3) LEAD COPLANARITY SHALL BE 0.10 MILLIMETER MAX. 4) DRAWING CONFORMS TO JEDEC MO-229, VARIATION VEED-5. 5) DRAWING IS NOT TO SCALE. 1.70 0.25 2.50 0.50 RECOMMENDED LAND PATTERN NOTICE: The information in this document is subject to change without notice. Users should warrant and guarantee that third party Intellectual Property rights are not infringed upon when integrating MPS products into any application. MPS will not assume any legal responsibility for any said applications. MP2631 Rev.0.9 9/15/2008 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2008 MPS. All Rights Reserved. 9