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D01605T-472 Datasheet(PDF) 5 Page - Monolithic Power Systems |
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D01605T-472 Datasheet(HTML) 5 Page - Monolithic Power Systems |
5 / 8 page MP2105 – 1MHz 800mA SYNCHRONOUS STEP-DOWN CONVERTER MP2105 Rev. 1.2 www.MonolithicPower.com 5 8/19/2005 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2005 MPS. All Rights Reserved. TM OPERATION The MP2105 is a constant frequency current mode PWM step-down converter. The MP2105 is optimized for low voltage, Li-Ion battery powered applications where high efficiency and small size are critical. The MP2105 uses an external resistor divider to set the output voltage from 0.6V to 6V. The device integrates both a main switch and a synchronous rectifier, which provides high efficiency and eliminates an external Schottky diode. The MP2105 can achieve 100% duty cycle. The duty cycle D of a step-down converter is defined as: % 100 V V % 100 f T D IN OUT OSC ON × ≈ × × = where TON is the main switch on time, and fOSC is the oscillator frequency (1MHz). IN EN FB GND SW + + -- PWMCMP PWM OSC + -- EAMP ICS SLOPE COMP FEEDBACK ERROR\ AMP 0.6V EAO CC 17pF BIAS & VOLTAGE REFERENCE PWM CONTROL LOGIC 1.0MHz OSCILLATOR IAMP 10X CURRENT SENSE AMP DH DL + -- MAIN SWITCH (PCH) SYNCHRONOUS RECTIFIER (NCH) MP2105_BD01 Figure 1—Functional Block Diagram |
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