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MP8762HGLE Datasheet(PDF) 6 Page - Monolithic Power Systems |
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MP8762HGLE Datasheet(HTML) 6 Page - Monolithic Power Systems |
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6 / 36 page  MP8762H ― 10A, 18V, SYNCHRONOUS STEP-DOWN CONVERTER MP8762H Rev. 1.2 www.MonolithicPower.com 6 6/21/2016 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2016 MPS. All Rights Reserved. PIN FUNCTIONS PIN# 16-Pin QFN Name Description 1 EN Enable pin. EN is a digital input that turns the regulator on or off. Drive EN high to turn on the regulator, drive it low to turn it off. Connect EN to IN through a pull-up resistor or a resistive voltage divider for automatic startup. Do not float this pin. See Enable Control section for more details. 2 FREQ Frequency set during CCM operation. A resistor connected between FREQ and IN is required to set the switching frequency. The ON time is determined by the input voltage and the resistor connected to the FREQ pin. IN connect through a resistor is used for line feed-forward and makes the frequency basically constant during input voltage’s variation. 3 FB Feedback. An external resistor divider from the output to GND, tapped to the FB pin, sets the output voltage. It is recommended to place the resistor divider as close to FB pin as possible. Vias should be avoided on the FB traces. 4 SS Soft Start. Connect an external capacitor to program the soft start time for the switch mode regulator. 5 AGND Analog ground. Select this pin as the control circuit reference point. 6 PG Power good output, the output of this pin is an open drain signal and a pull-up resistor connected to a DC voltage is required to indicate high if the output voltage is higher than 91% of the nominal voltage. There is a delay from FB ≥ 91% to PGOOD goes high. 7 VCC Internal 4.8V LDO output. The driver and control circuits are powered from this voltage. Decouple with a minimum 1µF ceramic capacitor as close to the pin as possible. X7R or X5R grade dielectric ceramic capacitors are recommended for their stable temperature characteristics. 8 BST Bootstrap. A capacitor connected between SW and BST pins is required to form a floating supply across the high-side switch driver. 9, 14 IN Supply Voltage. The IN pin supplies power for internal MOSFET and regulator. The MP8762H operates from a +2.5V to +18V input rail with 5V external bias and a +4.5V to +18V input rail with internal bias. An input capacitor is needed to decouple the input rail. Use wide PCB traces and multiple vias to make the connection. 10,11,12, 13 PGND System Ground. This pin is the reference ground of the regulated output voltage. For this reason care must be taken in PCB layout. Use wide PCB traces to make the connection. 15, 16 SW Switch Output. Connect this pin to the inductor and bootstrap capacitor. This pin is driven up to the VIN voltage by the high-side switch during the on-time of the PWM duty cycle. The inductor current drives the SW pin negative during the off-time. The on-resistance of the low-side switch and the internal Schottky diode fixes the negative voltage. Use wide PCB traces to make the connection. |
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