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MP2130 Datasheet(PDF) 9 Page - Monolithic Power Systems |
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MP2130 Datasheet(HTML) 9 Page - Monolithic Power Systems |
9 / 12 page MP2130 – HIGH EFFICIENCY, 3.5A, 6V, 1.2MHz SYNCHRONOUS STEP-DOWN CONVERTER MP2130 Rev. 1.23 www.MonolithicPower.com 9 11/22/2013 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2013 MPS. All Rights Reserved. OPERATION MP2130 uses constant on-time control with input voltage feed forward to stabilize the switching frequency over full input range. At light load, MP2130 employs a proprietary control of low side switch and inductor current to eliminate ringing on switching node and improve efficiency. Constant On-time Control Compare to fixed frequency PWM control, constant on-time control offers the advantage of simpler control loop and faster transient response. By using input voltage feed forward, MP2130 maintains a nearly constant switching frequency across input and output voltage range. The on- time of the switching pulse can be estimated as: OUT ON IN V T0.833 s V =⋅ μ To prevent inductor current run away during load transient, MP2130 fixes the minimum off time to be 30ns. However, this minimum off time limit will not affect operation of MP2130 in steady state in any way. Light Load Operation In light load condition, MP2130 uses a proprietary control scheme to save power and improve efficiency. Instead of turning off the low side switch immediately when inductor current start to reverse, MP2130 gradually ramp down and regulates the low side switch current to a minimal level, thus avoids the ringing at switching node that always occurs in discontinuous conduction mode (DCM) operation Enable When input voltage is greater than the under- voltage lockout threshold (UVLO), typically 2.5V, MP2130 can be enabled by pulling EN pin to higher than 1.2V. Leaving EN pin float or pull down to ground will disable MP2130. There is an internal 1Meg Ohm resistor from EN pin to ground. Soft Start/Stop MP2130 has built-in soft start that ramps up the output voltage in a controlled slew rate, avoiding overshoot at startup. The soft start time is about 1ms typical. At disable, MP2130 ramps down the internal reference thus allow the load to linearly discharge the output. Power Good Indicator MP2130 has an open drain with 500kΩ pull-up resistor pin for power good indicator PG. When FB pin is within +/-10% of regulation voltage, i.e. 0.6V, PG pin is pulled up to IN by the internal resistor. If FB pin voltage is out of the +/-10% window, PG pin is pulled down to ground by an internal MOS FET. The MOS FET has a maximum Rdson of less than 100Ω. Current limit MP2130 has a typical 4.5A current limit for the high side switch. When the high side switch hits current limit, MP2130 will touch the hiccup threshold until the current lower down. This will prevent inductor current from continuing to build up which will result in damage of the components. Short Circuit and Recovery MP2130 enters short circuit protection mode when the inductor current hits the current limit, and tries to recover from short circuit with hiccup mode. In short circuit protection, MP2130 will disable output power stage, discharge soft-start cap and then automatically try to soft-start again. If the short circuit condition still holds after soft-start ends, MP2130 repeats this operation cycle till short circuit disappears and output rises back to regulation level. |
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