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MP26053DQ Datasheet(PDF) 8 Page - Monolithic Power Systems |
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MP26053DQ Datasheet(HTML) 8 Page - Monolithic Power Systems |
8 / 11 page MP26053 – 28V, 1A LINEAR BATTERY CHARGER WITH TRICKLE CHARGE AND TIMER MP26053 Rev. 0.9 www.MonolithicPower.com 8 8/25/2008 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2008 MPS. All Rights Reserved. Charge Current vs. 1/RCHG 1000 900 800 700 600 500 400 300 200 0 0.2 0.1 0.3 0.4 0.6 0.7 0.5 Figure 3—Charge Current vs. 1/RCHG Resistance The recommended resistance for programming the charge current is 2.3kΩ<RCHG<11kΩ. The open-drain pin CHG is used to indicate charging status. When the battery full condition is met or any other condition prevents the charger from charging, CHG will become a floating pin. Timer Operation The TMR pin is used to set the internal oscillator frequency, OSC TMR F F11Hz C µ =× . The on-chip timer will start to count down after initial power-up or every time it is enabled. This timer will limit the max trickle-charge time to 32768 internal oscillating cycles. If the charger stays in trickle mode for longer than 32768 cycles, it will be terminated and a fault will be set by floating CHG pin. After fault reporting, the charger can be re-initiated only by recycling the power supply or SHDN signal. If the charger successfully goes through trickle charge within the allowed time limit, it will start CC charging and then CV charging. If the total charge time exceeds 262144 cycles and the battery full has not been qualified, the charger will be terminated and a fault will also be set by flashing CHG pin at the rate of half the internal oscillation frequency. This function prevents charging a dead battery for prolonged duration. The timer function can be disabled by shorting TMR to ground. Charger Status Indication SHDN = High Vin Fault Battery Full Time out Fault Ambient Temperature Fault In Charging CHG HIGH HIGH Toggle HIGH LOW ACOK is LOW while 3.0V<VIN<7V, otherwise it is HIGH. Negative Thermal Coefficient (NTC) Thermistor The MP26053 has a built-in NTC resistance window comparator. If configured as the typical application circuit as indicated in Figure 1, the MP26053 will cease charging if RNTC<4.161kΩ or RNTC>27.285kΩ. This represents a valid charging temperature range of 0°C to 50°C for the EWTF03-103 J31 H NTC resistor. Thermal Protection The MP26053 has proprietary thermal protection to prevent the IC from overheating. When in thermal protection mode, the average charge current will be reduced to prevent the IC from overheating. 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. |
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