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MP1605 Datasheet(PDF) 13 Page - Monolithic Power Systems |
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MP1605 Datasheet(HTML) 13 Page - Monolithic Power Systems |
13 / 18 page MP1605 – 2A, SYNCHRONOUS, STEP-DOWN SWITCHER WITH 11µA IQ MP1605 Rev. 1.0 www.MonolithicPower.com 13 6/17/2016 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2016 MPS. All Rights Reserved. HS_ driver VREF VFB COT Generator EN IAAM IL_ sense R S Q FBCOMP AAMCOMP Figure 5: Simplified AAM Control Logic AAM Io IL b. Increase load in AAM AAM Io IL a. Light load in AAM Figure 6: AAM Comparator Control TON If the AAM comparator pulse is shorter than the on-time generator, the operation mode is as shown in Figure 7. This usually occurs when using a very small inductance. AAM Io IL b. Increase load in on-timer AAM Io IL a. Light load in on-timer Figure 7: On-Timer Control TON The AAM circuit has another 150ns of AAM blank time in sleep mode. If the on-timer is less than 150ns, the high-side MOSFET may turn off after the on-time generator pulse without AAM control. The on-time pulse at sleep mode is about 40% larger than in DCM or CCM. In this condition, IL may not reach the AAM threshold (see Figure 8). AAM Io IL 150ns 150ns Figure 8: AAM Blank Time in Sleep Mode The AAM threshold decreases as TON increases (see Figure 9). For CCM state, IOUT requires more than half of the AAM threshold. Figure 9: AAM Threshold Decreases as TON Increases The MP1605 uses a zero-current cross detect circuit (ZCD) to determine when the inductor current begins reversing. When the inductor current reaches the ZCD threshold, the low-side switch is turned off. AAM mode with the ZCD circuit makes the MP1605 work continuously in DCM at light load, even if VOUT is close to VIN. Enable (EN) When the input voltage is greater than the under-voltage lockout (UVLO) threshold (typically 2V), the MP1605 can be enabled by pulling EN higher than 1.2V. Leaving EN floating or pulling it down to ground disables the MP1605. There is an internal 1M Ω resistor from EN to ground. When the MP1605 is disabled, the part goes into output discharge mode automatically. The internal discharge MOSFET provides a resistive discharge path for the output capacitor. Soft Start (SS) The MP1605 uses 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. |
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