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MP1601A Datasheet(PDF) 13 Page - Monolithic Power Systems |
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MP1601A Datasheet(HTML) 13 Page - Monolithic Power Systems |
13 / 17 page MP1601A – 1A, SYNCHRONOUS, STEP-DOWN CONVERTER IN A SOT563 MP1601A Rev. 1.0 www.MonolithicPower.com 13 9/2/2016 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2016 MPS. All Rights Reserved. OPERATION The MP1601A uses constant on-time control with input voltage feed-forward to stabilize the switching frequency over the full input range. It achieves 1A of continuous output current from a 2.3V to 5.5V input voltage range with excellent load and line regulation. The output voltage can be regulated as low as 0.6V. Constant-on-Time (COT) Control Compared to fixed-frequency pulse-width modulation (PWM) control, constant-on-time control (COT) offers a simpler control loop and a faster transient response. By using input voltage feed-forward, the MP1601A maintains a nearly constant switching frequency across the input and output voltage ranges. The switching pulse on time can be estimated with Equation (1): OUT ON IN V T 0.454 s V (1) To prevent inductor current runaway during the load transient, the MP1601A uses a fixed minimum off time of 60ns. Enable (EN) When the input voltage is greater than the under- voltage lockout (UVLO) threshold (typically 2V), the MP1601A can be enabled by pulling EN higher than 1.2V. Floating EN or pulling it down to ground disables the MP1601A. There is an internal 1M Ω resistor from EN to ground. When the device is disabled, the MP1601A goes into output discharge mode automatically. Its internal discharge MOSFET provides a resistive discharge path for the output capacitor. Soft Start (SS) The MP1601A has a built-in soft start (SS) that ramps up the output voltage at a controlled slew rate to avoid overshooting at start-up. The soft- start time is about 0.5ms, typically. Current Limit The MP1601A has a 2A, high-side, switch current limit, typically. When the high-side switch reaches its current limit, the MP1601A remains in hiccup mode until the current drops. This prevents the inductor current from continuing to rise and damaging components. Short Circuit and Recovery The MP1601A enters short-circuit protection (SCP) mode when it reaches the current limit and attempts to recover with hiccup mode. In this process, the MP1601A disables the output power stage, discharges the soft-start capacitor, and then attempts to soft start automatically. If the short-circuit condition remains after the soft start ends, the MP1601A repeats this cycle until the short circuit disappears and the output rises back to regulation levels. |
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