전자부품 데이터시트 검색엔진 |
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MP2122 데이터시트(PDF) 12 Page - Monolithic Power Systems |
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MP2122 데이터시트(HTML) 12 Page - Monolithic Power Systems |
12 / 16 page MP2122 –6V, 2A, LOW QUIESCENT CURRENT, DUAL, SYNC BUCK REGULATOR MP2122 Rev. 1.02 www.MonolithicPower.com 12 6/12/2017 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2017 MPS. All Rights Reserved. OPERATION MP2122 is a fully-integrated, dual-channel, synchronous, step-down converter. Both channels have peak-current modes with internal compensation for faster transient responses and cycle-by-cycle current limits. MP2122 is optimized for low-voltage, portable applications where efficiency and small size are critical. 180° Phase-Shift By default, the MP2122’s two channels operate at a 180° phase-shift to reduce input current ripple: The smaller current ripple allows for a smaller input bypass capacitor. In CCM, two internal clocks control the switching: The high- side MOSFET turns on at the corresponding CLK’s rising edge. CLK1 CLK2 SW1 SW2 t CLk1, 2 has a 180o phase shift Figure 2: Clock/Switching Timing However, the switching frequency for each channel falls when operating at low dropout, so the MP2122 operates at a default switching frequency of 1MHz with a fixed OFF time. After the input voltage recovers, switching for PWM mode resumes normally and synchronizes with the master oscillator for phase-shifted operation. Light-Load Operation In light loads, the MP2122 uses a proprietary control scheme to save power and improve efficiency. The MP2122 will turn off the low side switch when inductor current starts to reverse. Then MP2122 works in discontinuous conduction mode (DCM) operation. When either channel enters DCM or low- dropout operation, this channel will not be controlled by the internal 1MHz oscillator. Condition Mode CH1 CH2 CH1 CH2 1 Heavy Load 1MHz CCM 1MHz CCM,0° Phase 2 Light Load DCM DCM 3 Low Dropout Fixed OFF Time Fixed OFF Time 4 Heavy Load Light Load 0.95MHz CCM DCM 5 Light Load Heavy Load DCM 0.95MHz CCM 6 Heavy Load Low Dropout 0.95MHz CCM Fixed OFF Time 7 Low Dropout Heavy Load Fixed OFF Time 0.95MHz CCM 8 Light Load Low Dropout DCM Fixed OFF Time 9 Low Dropout Light Load Fixed OFF Time DCM Soft Start MP2122 has a built-in soft start that ramps up the output voltage at a controlled slew rate to start-up overshoot. The soft-start time is ~0.5ms. Current Limit and Short-Circuit Recovery Each channel’s high-side switch has a 3.5A (typ.) current limit. The MP2122 treats any current-limit condition that remains for 400us as a short and enter hiccup mode. The MP2122 disables its output power stage in hiccup mode, and then slowly discharges the soft-start capacitor before initiating soft-start. If the short-circuit condition remains, the MP2122 repeats this operation till the short circuit disappears and output returns to the regulation level. |
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