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MP38115DQ Datasheet(PDF) 3 Page - Monolithic Power Systems |
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MP38115DQ Datasheet(HTML) 3 Page - Monolithic Power Systems |
3 / 10 page MP38115 – 4A, 5.5V SYNCHRONOUS STEP-DOWN SWITCHING REGULATOR MP38115 Rev. 0.92 www.MonolithicPower.com 3 8/11/2009 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2009 MPS. All Rights Reserved. ELECTRICAL CHARACTERISTICS (4) (continued) VIN = VEN = 3.6V, TA = +25°C, unless otherwise noted. Parameters Condition Min Typ Max Units High-Side Switch Current Limit Sourcing 6.5 A Low-Side Switch Current Limit Sinking 3.5 A Oscillator Frequency 1.2 1.5 1.8 MHz Maximum Synch Frequency 2 MHz Minimum Synch Frequency 1 MHz Minimum On Time 50 ns Maximum Duty Cycle 90 % Thermal Shutdown Threshold Hysteresis = 20°C 150 °C Note: 4) Production test at +25°C. Specifications over the temperature range are guaranteed by design and characterization. PIN FUNCTIONS Pin # Name Description 6 VCC Bias Supply. This supplies power to both the internal control circuit and the gate drivers. A decoupling capacitor to ground is required close to this pin. 4, 7 IN Input Supply. A decoupling capacitor to ground is required close to these pins to reduce switching spikes. 3, 8 SW Switch Node Connection to the Inductor. These pins connect to the internal high and low- side power MOSFET switches. All SW pins must be connected together externally. 2, 9 GND Ground. Connect these pins with larger copper areas to the negative terminals of the input and output capacitors. 5 BS Bootstrap. A capacitor between this pin and SW provides a floating supply for the high-side gate driver. 1 FB Feedback. This is the input to the error amplifier. An external resistive divider connects this pin between the output and GND. The voltage on the FB pin compares to the internal 0.8V reference to set the regulation voltage. 10 EN/SYNC Enable and Frequency Synchronization Input Pin. Forcing this pin below 0.4V shuts down the part. Forcing this pin above 1.6V turns on the part. Applying a 1MHz to 2MHz clock signal to this pin synchronizes the internal oscillator frequency to the external clock. |
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