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MP2143H Scheda tecnica(PDF) 11 Page - Monolithic Power Systems |
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MP2143H Scheda tecnica(HTML) 11 Page - Monolithic Power Systems |
11 / 15 page MP2143H – 3A, 5.5V, 2.0MHz, SYNCHRONOUS STEP-DOWN SWITCHER MP2143H Rev. 1.02 www.MonolithicPower.com 11 6/30/2016 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2016 MPS. All Rights Reserved. OPERATION The MP2143H uses constant-on-time control with input-voltage feed-forward to stabilize the switching frequency over its full input range. It can achieve up to 3A continuous output current from a 2.5V to 5.5V input voltage with excellent load and line regulation. The output voltage can be regulated as low as 0.6V. Constant-On-Time Control When compared to fixed-frequency PWM control, constant on-time control offers a simpler control loop and faster transient response. By using input-voltage feed-forward, the MP2143H maintains a nearly constant switching frequency across the entire input and output voltage range. The switching pulse ON time can be estimated as: Ton=VOUT/VIN×0.500µs To prevent inductor current runaway during the load transient, the MP2143H has a fixed minimum OFF time of 50ns. However, this minimum OFF time limit does not affect the operation of the MP2143H in steady state in any way. Enable When the input voltage exceeds the under- voltage lockout (UVLO) threshold—typically 2.2V—the MP2143H is enabled by pulling the EN pin above 1.2V. Leaving the EN pin floating or grounded will disable the MP2143H. There is an internal 1MΩ resistor from the EN pin to ground. Soft-Start/Stop MP2143H has a built-in soft-start that ramps up the output voltage at a constant slew rate that avoids overshooting at startup. The soft-start time is typically about 1.3ms. When disabled, the MP2143H ramps down the internal reference voltage to allow the load to linearly discharge the output. Power Good Indicator MP2143H has an open drain with 500kΩ pull-up resistor pin for power good (PG) indication. When the FB pin is within ±10% of regulation voltage (0.6V), the PG pin is pulled up to VIN by the internal resistor. If the FB pin voltage is outside the ±10% window, the PG pin is pulled to ground by an internal MOSFET. The MOSFET has a maximum Rdson of less than 100Ω. Current Limit The MP2143H has a 4.8A current limit for the high side switch (HS-FET). When the HS-FET hits its current limit, the MP2143H enters hiccup mode until the current drops to prevent the inductor current from building and possibly damaging the components. Short Circuit and Recovery The MP2143H also enters short-circuit protection (SCP) mode when it hits the current limit, and tries to recover from the short circuit by entering hiccup mode. In SCP, the MP2143H disables the output power stage, discharges a soft-start capacitor, and then enacts a soft-start procedure. If the short-circuit condition still holds after soft-start ends, the MP2143H repeats this operation until the short circuit ceases and output rises back to regulation level. |
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