MP26058 28V, 1A Li + Linear Battery Charger with Timer and LDO Mode The Future of Analog IC Technology DESCRIPTION FEATURES The MP26058 is a linear, high performance single cell Li-Ion or Li-Polymer battery charger. By integrating high voltage input protection into the charger IC, the MP26058 can tolerate an input surge up to 28V. The LDO mode makes the MP26058 suitable for power up the system when battery is not present. • The device features constant current (CC) and constant voltage (CV) charging modes with programmable charge currents (200mA to 1A), current blocking. The other features include the programmable battery full indication threshold and the LDO mode operation which keeps charging the battery after battery-full is asserted and stay in full-state as long as the valid input is maintained. MP26058 can provide load to the system if no battery is connected. For guaranteed safe operation, the MP26058 limits the die temperature to a preset value when the device is heated up due to limited PCB space. Other safety features are battery temperature monitoring, and programmable timer to prevent prolonged charging a dead battery. MP26058 is available in 10-pin 3mm x 3mm DFN packages. Complete Solution for Charging Single-Cell Lion-Ion Battery Input Surge Up to 28V Wide input operating range 2.8V – 7V Adapter or USB Input Programmable Charge Current: 200mA to 1A Programmable timer 7V Input Over Voltage Protection 0.75% VBATT Accuracy over Temperature <1µA Battery Reverse Current 125µA Standby Current from VIN Battery Temperature Monitoring Automatic die temperature limiting Fault and Charge Status Indicators Soft-Start to limit inrush current Tiny 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 3.5V - 6.5V 1 2 3 4 5 MP26058 Rev. 0.91 1/25/2010 IN BATT 10 9 ACOK NTC CHG ISET 8 TMR IBF GND SHDN 7 6 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2010 MPS. All Rights Reserved. 1 MP26058-28V, 1A LI + LINEAR BATTERY CHARGER WITH TIMER AND LDO MODE ABSOLUTE MAXIMUM RATINGS (1) PACKAGE REFERENCE TOP VIEW IN 1 10 BATT ACOK 2 9 NTC CHG 3 8 ISET TMR 4 7 IBF GND 5 6 SHDN EXPOSED PAD ON BACKSIDE Part Number* MP26058DQ * IN to GND .................................... –0.3V to +28V All Other Pins to GND................. –0.3V to +6.5V ACOK & CHG Maximum Sink Current…20mA Junction Temperature...............................140°C Lead Temperature ....................................260°C Storage Temperature ..............–65°C to +150°C Recommended Operating Conditions Nominal Supply Voltage VIN............ 3.5V to 5.5V Operating Temperature .............–40°C to +85°C Thermal Resistance Package QFN10 (3mm x 3mm) Temperature –40°C to +85°C For Tape & Reel, add suffix –Z (eg. MP26058DQ–Z) For RoHS compliant packaging, add suffix –LF (eg. MP26058DQ–LF–Z) (2) (3) θJA θJC 3x3 QFN10 ............................. 50 ...... 12... °C/W 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 JEDEC51-7 4 layer board.. ELECTRICAL CHARACTERISTICS VIN = 5V, VSHDN =0V, TA = +25°C, unless otherwise noted. Parameter Symbol Condition Supply Current ISUPPLY Battery Voltage Regulation Constant Current Regulation VBATT ICHG Constant Current Variation Battery Full Programming Range IBF Accuracy Input OVP OVP Hysteresis Input UVLO UVLO Hysteresis Input ACOK Up Range ACOK & CHG Over Voltage Clamp MP26058 Rev. 0.91 1/25/2010 IBF SHDN = High SHDN = Low, ICHG = 0A T = –5°C to +75°C, IBATT = 0A VIN = 5V, VBATT = 3.8V RCHG = 3.3kΩ VIN = 5V, VBATT = 3.8V, TJ = 0°C to +120°C, RCHG = 1.6kΩ to 8.0kΩ Refer to Operation section for programming IBF Min Typ 4.16 30 500 4.20 4.24 V 448 515 582 mA 87 100 113 %ICHG (4) 50 VIN Rising 75 6.7 125 7.3 VIN Rising 1.6 7 400 2.2 100 7 7.6 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2010 MPS. All Rights Reserved. Units µA 10 6.7 VZ Max 2.8 7.2 %ICHG (4) %IBF(5) V mV V mV V V 2 MP26058-28V, 1A LI + LINEAR BATTERY CHARGER WITH TIMER AND LDO MODE ELECTRICAL CHARACTERISTICS (continued) VIN = 5V, VSHDN =0V, TA = +25°C, unless otherwise noted. Parameter Symbol Condition SHDN Trip Threshold High Min Typ 2.6 0.4 CHG , ACOK Sink Current Pin Voltage = 0.2V Battery Reverse Current to BATT Pin SHDN = Low and Input = Floating or 0V VINVBATT 5 Soft Thermal Shutdown Threshold 0.25 105 Soft Thermal Shutdown Hysteresis Internal Soft-Start Time From 10% to 90% of full current V mA 1 VBATT = 3.8V, RCHG = 6kΩ. Current drop 10% Units V SHDN Trip Threshold Low Dropout Voltage Max 120 µA V 135 °C 10 °C 20 µs R_NTC at 0°C TH11Note: R_NTC is 100k at 25°C 4H104F 376.6 kΩ R_NTC at 50°C TH11Note: R_NTC is 100k at 25°C 4H104F 32.3 kΩ 5 Hz Oscillation Freq CTMR = 2.2uF TMR Pin Source Current ITMR1 VTMR=0.1V 18 20 22 µA TMR Pin Sink Current ITMR2 VTMR=1.5V 18 20 22 µA Notes: 4) ICHG is the target preprogrammed charge current (Die temperature below 110°C). 5) IBF is the target preprogrammed battery full current threshold. MP26058 Rev. 0.91 1/25/2010 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2010 MPS. All Rights Reserved. 3 MP26058-28V, 1A LI + LINEAR BATTERY CHARGER WITH TIMER AND LDO MODE PIN FUNCTIONS Pin # Name 1 IN 3 CHG Input Supply Pin. IN receives the AC adapter or USB supply voltage. Open-Drain Charge Indicator. This pin is low during charging, is High after battery full or termination, is toggling the battery is fault. 2 ACOK Open-Drain Fault Status Indicator. 4 TMR 5 6 8 7 9 10 Description Oscillator Period Timer. Connect a timing capacitor between this pin and GND to set the oscillator period. T(sec)=22000 * CTMR (µF). Short this pin to ground to disable timer. GND, The exposed pad and GND pin must be connected to the same ground plane. Exposed Pad SHDN Charger IC Enable. An input “Low” signal at this pin or if the pin is floating will enable the IC. Constant Charge Current Program pin. Connect this pin to an external resistor to program the ISET charging current in CC Mode. Charge Status Threshold Program. Connect this pin to an external resistor to program the IBF charge termination current or battery full indication threshold. Negative Temperature Coefficient (NTC) Thermistor Pin. Connect a 500kΩ resistor from this pin to the IN pin and a 100kΩ NTC resistor (within the battery pack) from this pin to ground. If NTC NTC function is not used, replace NTC resistor with a regular 100kΩ resistor from this pin to ground. Do not leave this pin floating. BATT MP26058 Rev. 0.91 1/25/2010 Charger Output. www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2010 MPS. All Rights Reserved. 4 MP26058-28V, 1A LI + LINEAR BATTERY CHARGER WITH TIMER AND LDO MODE TYPICAL PERFORMANCE CHARACTERISTICS CIN=4.7µF, COUT=2.2µF, VIN=5V, TA=25ºC, unless otherwise noted. Battery Charge Curve 4.5 3.5 600 3.0 ICHG 500 2.5 400 2.0 300 1.5 200 1.0 100 0.5 VSTATUS 0 30 60 90 120 150 180 TIME (MIN) 0 Thermal Prot ect ion 800 600 BATTERY VOLTAGE (V) 4.21 4.20 200 ICHG=0.2A 0 1.0 1.8 2.6 3.4 4.2 BATTERY VOLTAGE (V) ICHG=1A ICHG=0.5A I CHG=0.8A 4.18 MP26058 Rev. 0.91 1/25/2010 600 ICHG=0.5A 400 ICHG=0.2A 200 4.0 4.5 5.0 5.5 6.0 6.5 INPUT VOLTAGE (V) 7.0 Thermal Protection 0.6 1200 0.5 1000 0.3 0.2 0 ICHG=0.8A 800 RCHG Resistance vs. ICHG (VCE=VIN-VBAT) 800 600 400 0.1 200 400 600 800 1000 CHARGE CURRENT (mA) VBAT=3.8V 1000 0 5.0 0.4 ICHG=0.2A 4.19 4.17 0 ICHG=0.5A 400 Constant Voltage Charge 4.22 ICHG=0.8A ICHG (mA) 0 1200 CHARGE CURRENT (mA) 4.0 VSTATUS (V) ICHG (mA) VBAT 700 VBAT (V) 800 1000 CHARGE CURRENT (mA) 900 Constant Current Charge vs. Input Voltage Charge Current vs. Battery Voltage 0 200 400 600 ISET (mA) 800 1000 200 1 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2010 MPS. All Rights Reserved. 2 3 4 VCE (V) 5 6 5 MP26058-28V, 1A LI + LINEAR BATTERY CHARGER WITH TIMER AND LDO MODE TYPICAL PERFORMANCE CHARACTERISTICS CIN=4.7µF, COUT=2.2µF, VIN=5V, Ta=25ºC, unless otherwise noted. (continued) MP26058 Rev. 0.91 1/25/2010 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2010 MPS. All Rights Reserved. 6 MP26058-28V, 1A LI + LINEAR BATTERY CHARGER WITH TIMER AND LDO MODE BLOCK DIAGRAM IN VIN CIN 1 R1 NTC 9 BATT I BATT RNTC 10 TMR CTMR ISET 8.2V 4 BATTERY CHARGE CONTROL COUT 3 8 RCHG 8.2V IBF + VBATT _ CHG ACOK 2 7 RBF 6 ON OFF SHDN 5 GND Figure 1—Functional Block Diagram OPERATION Input Voltage Range The MP26058 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 2.2V or higher than 7.0V. For MP26058, the open-drain pin ACOK is used to indicate an input power good condition (i.e. 2.8V<VIN<7.0V). If the input voltage is lower than the battery voltage, the IC is also disabled to prevent the battery from draining. if the battery is still not reaching IBF condition, the on-chip timer will terminate the charger to prevent charging the dead battery for excessive long time and the fault condition will be flagged by flashing the CHG LED. IBAT C.C Charging C.V Charging Charge Cycle (Mode Change: CC-> LDO) Figure 2 below shows the typical charging profile for the MP26058. It begins charging at the constant current of the programmed value (ICHG). This is referred to as Constant Current (CC) mode. Once the battery voltage reaches 4.2V, the charger will operate in the LDO mode to keep the battery is fully charged. The charge current drops during LDO mode, and the battery full indication is set when the charge current reduced to the preset value based on RBF. After 262144 cycles of continuous charging, MP26058 Rev. 0.91 1/25/2010 IBF IBF VBAT 4.2V Figure 2—MP26058 Typical Charging Profile www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2010 MPS. All Rights Reserved. 7 MP26058-28V, 1A LI + LINEAR BATTERY CHARGER WITH TIMER AND LDO MODE Programming of Charge Current and Battery Full Current The charge current (ICHG) is set by a resistor (RCHG) 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—RCHG and ICHG Relationship RCHG (kΩ) 1.65 1.82 2.05 2.32 2.74 3.3 4.12 5.6 8.66 16.9 ICHG (mA) 1000 900 800 700 600 500 400 300 200 100 Charge Current vs 1/RPGM Resistance CHARGE CURRENT (mA) 1000 900 800 700 600 500 400 300 200 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 Figure 3—Charge Current vs 1/RCHG Resistance The recommended resistance for programming the charge current is 2.3kΩ<RCHG<11kΩ. The battery full charge current threshold (IBF) is programmed by connecting a resistor RBF from the IBF pin to GND: IBF = Timer Operation The TMR pin is used to set the internal µF oscillator frequency: FOSC = 11Hz × CTMR The on-chip timer will start count down after initial power-up or every time being enabled. This timer will limit the max charge time when battery is short to ground to 16384 internal oscillating cycles, or if the total charge time exceeds 262144 cycles and the battery full has not been qualified, then it will terminate the charger and a fault will be set by flashing CHG LED at the rate of half the internal oscillation frequency.. After fault reporting, the charger can be re-initiated only by recycling the power supply or SHDN\ signal. The timer function can be disabled by shorting TMR pin to ground. Negative Thermal Coefficient (NTC) Thermistor The MP26058 has a built-in NTC resistance window comparator. If configured as the typical application circuit as indicated in Figure 1, the MP26058 will cease charging if RNTC<32.3kΩ or RNTC>376.6kΩ. This represents a valid charging temperature range of 0°C to 50°C for the TH11-4H104F NTC resistor. Thermal Protection The MP26058 has proprietary thermal protection to prevent the IC from overheating. When in thermal protection mode, the charge current will reduce to maintain the safe junction temperature. Operating in thermal protection mode will slow down the charging process. Lowering the input voltage and enhancing thermal dissipation to the environment can effectively prevent the IC from going into thermal protection mode. 1A × 1.7kΩ R BF Where 2RCHG<RBF<10RCHG. 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 a floating. MP26058 Rev. 0.91 1/25/2010 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2010 MPS. All Rights Reserved. 8 MP26058-28V, 1A LI + LINEAR BATTERY CHARGER WITH TIMER AND LDO MODE APPLICATION Flow Chart of Operation Power-On Reset (POR) feature can be applied to the MP26058 to ensure that the device starts operating in a known state. The flow chart in Figure 4 describes the conditions and operation modes of the MP26058. CVC and CCC stand for “constant voltage charge” and “constant current charge”, respectively. Figure 4 — Flow Chart Operation MP26058 Rev. 0.91 1/25/2010 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2010 MPS. All Rights Reserved. 9 MP26058-28V, 1A LI + LINEAR BATTERY CHARGER WITH TIMER AND LDO MODE 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. MP26058 Rev. 0.91 1/25/2010 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2010 MPS. All Rights Reserved. 10