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MP8761 Datasheet(PDF) 5 Page - Monolithic Power Systems

Part No. MP8761
Description  High Efficiency, 8A, 18V, Synchronous, Step-Down Converter
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Manufacturer  MPS [Monolithic Power Systems]
Direct Link  http://www.monolithicpower.com
Logo MPS - Monolithic Power Systems

MP8761 Datasheet(HTML) 5 Page - Monolithic Power Systems

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MP8761 — 8A, 18V, SYNCHRONOUS STEP-DOWN CONVERTER
MP8761 Rev. 1.1
www.MonolithicPower.com
5
11/4/2013
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2013 MPS. All Rights Reserved.
PIN FUNCTIONS
PIN #
13-Pin QFN
PIN#
16-Pin QFN
Name
Description
1
1
EN
Enable. Digital input to turn 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.
2
2
FREQ
Frequency Set. Requires a resistor connected between FREQ and IN to set
the switching frequency. The input voltage and the resistor connected to
the FREQ pin determine the ON time. The connection to the IN pin
provides line feed-forward and stabilizes the frequency during input voltage
jitter.
3
3
FB
Feedback. Connect to the tab of an external resistor divider from the output
to GND to set the output voltage. FB is also configured to realize over-
voltage protection (OVP) by monitoring output voltage. Place the resistor
divider as close to FB pin as possible. Avoid using vias on the FB traces.
4
4
SS
Soft-Start. Connect an external capacitor to program the soft start time for
the switch mode regulator.
5
5
AGND Analog ground. The control circuit reference.
6
6
PG
Power Good, the output is an open drain signal. Require a pull-up resistor
to a DC voltage to indicate high if the output voltage exceeds 91% of the
nominal voltage. There is a delay from FB ≥ 91% to PG goes high.
7
7
VCC
Internal 4.8V LDO output. Power the driver and control circuits. 5V external
bias can disable the internal LDO. Decoupling with ≥1µF ceramic capacitor
as close to the pin as possible. Use X7R or X5R dielectric ceramic
capacitors for their stable temperature characteristics.
8
8
BST
Bootstrap. Require a capacitor connected between SW and BS pins to form
a floating supply across the high-side switch driver.
9, 10
15, 16
SW
Switch Output. Connect to the inductor and bootstrap capacitor. The high-
side switch drives the pin up to the VIN voltage during PWM duty cycle’s ON
time. The inductor current drives the SW pin negative during the OFF-time.
The low-side switch’s ON-resistance and the internal Schottky diode clamp
the negative voltage. Connect using wide PCB traces
11, 12
10, 11, 12,
13
PGND
System Ground. Reference ground of the regulated output voltage. PCB
layout requires extra care. Connect using wide PCB traces.
13
9,14
IN
Supply Voltage. Supplies power to the internal MOSFET and regulator. The
MP8761 operates from a +2.5V to +5V input rail with 5V external bias and
a +4.5V to +18V input rail with internal bias. Requires an input decoupling
capacitor. Connect using wide PCB traces and multiple vias.


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