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MP26053 Datasheet(PDF) 4 Page - Monolithic Power Systems |
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MP26053 Datasheet(HTML) 4 Page - Monolithic Power Systems |
4 / 11 page MP26053 – 28V, 1A LINEAR BATTERY CHARGER WITH TRICKLE CHARGE AND TIMER MP26053 Rev. 0.9 www.MonolithicPower.com 4 8/25/2008 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2008 MPS. All Rights Reserved. PIN FUNCTIONS Pin # Name Description 1 VIN Input Supply Pin. VIN receives the AC adapter or USB supply voltage. 2 ACOK Open-Drain Fault Status Indicator. This pin is high under any fault conditions. 3 CHG Open-Drain Charge Indicator. This pin is low during charging, is high after battery full or termination, and is toggling when the battery is in fault condition. 4 TMR Oscillator Period Timer. Connect a timing capacitor between this pin and GND to set the oscillator period. The total charge time: TMR 3 ) SEC ( C * 10 22 T × = , where CTMR is in µF. 5 GND, Exposed Pad The exposed pad and GND pin must be connected to the same ground plane. 6 SHDN Charger IC Enable. An input “Low” signal at this pin or pin floating will enable the IC. 7 SS Soft-Start. Connect a capacitor to ground to set the soft-start time. 8 ISET Constant Charge Current Program Pin. Connect this pin to an external resistor to program the charging current in CC Mode. 9 NTC Negative Temperature Coefficient (NTC) Thermistor Pin. Connect a 50kΩ resistor from this pin to the VIN pin and a 10kΩ NTC resistor (within the battery pack) from this pin to ground. If NTC function is not used, replace NTC resistor with a regular 10kΩ resistor from this pin to ground. Do not leave this pin floating. 10 BATT Charger Output. BLOCK DIAGRAM BATTERY CHARGE CONTROL 7 8 9 4 1 10 3 2 5 6 TMR ISET NTC RNTC CSS SS CTMR RCHG IN BATT CHG ACOK GND 8.2V 8.2V VZ VZ SHDN VIN CIN COUT VBATT + _ ON OFF IBATT Figure 1—Functional Block Diagram |
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