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PDF MP8760 Datasheet ( Hoja de datos )

Número de pieza MP8760
Descripción Step-Down Converter
Fabricantes MPS 
Logotipo MPS Logotipo
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MP8760 datasheet

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MP8760 pdf
MP8760 — 6A, 18V, SYNCHRONOUS STEP-DOWN CONVERTER
PIN FUNCTIONS
PIN #
PIN#
13-Pin QFN 16-Pin QFN
11
22
33
44
Name
EN
FREQ
FB
SS
Description
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.
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.
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.
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
7
8
9,10
11, 12
13
6
7
8
15, 16
10, 11,
12 ,13
9,14
PG
VCC
BST
SW
PGND
IN
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.
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.
Bootstrap. Require a capacitor connected between SW and BS pins to
form a floating supply across the high-side switch driver.
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
System Ground. Reference ground of the regulated output voltage. PCB
layout requires extra care. Connect using wide PCB traces.
Supply Voltage. Supplies power to the internal MOSFET and regulator.
The MP8760 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.
MP8760 Rev. 1.1
11/4/2013
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2013 MPS. All Rights Reserved.
5

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MP8760 arduino
BLOCK DIAGRAM
MP8760 — 6A, 18V, SYNCHRONOUS STEP-DOWN CONVERTER
0.3V
0.75V
0. 6V
Figure 1: Functional Block Diagram
MP8760 Rev. 1.1
11/4/2013
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2013 MPS. All Rights Reserved.
11

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