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PDF MP8762 Datasheet ( Hoja de datos )

Número de pieza MP8762
Descripción Synchronous Step-down Converter
Fabricantes MPS 
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MP8762 datasheet

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MP8762 pdf
MP8762 10A, 18V, SYNCHRONOUS STEP-DOWN CONVERTER
PIN FUNCTIONS
PIN #
13-Pin
QFN
PIN#
16-Pin
QFN
Name
11
EN
2 2 FREQ
33
FB
44
SS
5 5 AGND
66
PG
77
88
VCC
BST
9,10 15, 16
SW
11,12
10,11,12,
13
PGND
13 9, 14
IN
Description
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.
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. An optional
1nF decoupling capacitor can be added to improve any switching frequency
jitter that may be present.
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.
Soft Start. Connect on external capacitor to program the soft start time for
the switch mode regulator.
Analog ground. Select this pin as the control circuit reference point.
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.
Internal 5V 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.
Bootstrap. A capacitor connected between SW and BS pins is required to
form a floating supply across the high-side switch driver.
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.
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.
Supply Voltage. The IN pin supplies power for internal MOSFET and
regulator. The MP8762 operates from a +2.5V to +5V 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.
MP8762 Rev. 1.4
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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MP8762 arduino
BLOCK DIAGRAM
MP8762 10A, 18V, SYNCHRONOUS STEP-DOWN CONVERTER
0.3V
0.75V
0. 6V
Figure 1—Functional Block Diagram
MP8762 Rev. 1.4
11/4/2013
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2013 MPS. All Rights Reserved.
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