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MP2109 Datasheet(PDF) 5 Page - Monolithic Power Systems |
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MP2109 Datasheet(HTML) 5 Page - Monolithic Power Systems |
5 / 8 page MP2109 – DUAL 1.2MHz 800mA SYNCHRONOUS STEP-DOWN CONVERTER MP2109 Rev.1.4 www.MonolithicPower.com 5 10/16/2006 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2006 MPS. All Rights Reserved. OPERATION IN1/ IN2 EN1/ EN2 FB1/ FB2 GND1/ GND2 SW1/ SW2 + + -- 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) MP2109_BD02 Figure 1—Functional Block Diagram (Diagram represents ½ of the MP2109) The MP2109 has dual independent constant frequency current mode PWM step-down converters. The MP2109 is optimized for low voltage, Li-Ion battery powered applications where high efficiency and small size are critical. The MP2109 uses external resistor dividers to set two output voltages independently from 0.6V to 6V. The device integrates both main switches and synchronous rectifiers, which provides high efficiency and eliminates the need for an external Schottky diode. The MP2109 can achieve 100% duty cycle. The duty cycle D of each 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, fOSC is the oscillator frequency (1.2MHz), VOUT is the output voltage and VIN is the input voltage. Current Mode PWM Control Slope compensated current mode PWM control provides stable switching and cycle-by-cycle current limit for superior load and line response and protection of the internal main switch and synchronous rectifier. Each channel switches at a constant frequency (1.2MHz) and regulates the output voltage. During each cycle the PWM comparator modulates the power transferred to the load by changing the inductor peak current based on the feedback error voltage. During normal operation, the main switch is turned on for a certain time to ramp the inductor current at each rising edge of the internal oscillator, and switched off when the peak inductor current is above the error voltage. When the main switch is off, the synchronous rectifier will be turned on immediately and stay on until the next cycle starts. |
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