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MP1475 数据表(PDF) 7 Page - Monolithic Power Systems

部件名 MP1475
功能描述  High-Efficiency, 3A, 16V, 500kHz Synchronous, Step-Down Converter
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制造商  MPS [Monolithic Power Systems]
网页  http://www.monolithicpower.com
标志 MPS - Monolithic Power Systems

MP1475 数据表(HTML) 7 Page - Monolithic Power Systems

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MP1475 – SYNCHRONOUS STEP-DOWN CONVERTER
MP1475 Rev. 1.01
www.MonolithicPower.com
7
4/3/2014
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2014 MPS. All Rights Reserved.
PIN FUNCTIONS
Package
Pin #
Name
Description
1
PG
Power Good Output. The output of this pin is an open drain that goes high if the output
voltage exceeds 90% of the normal voltage. There is a 0.4ms delay between when
FB≥90% to when the PG pin goes high.
2
IN
Supply Voltage. The IN pin supplies power for internal MOSFET and regulator. The
MP1475 operates from a +4.5V to +16V input rail. Requires a low-ESR, and low-
inductance capacitor (C1) to decouple the input rail. Place the input capacitor very close to
this pin and connect it with wide PCB traces and multiple vias to make the connection.
3
SW
Switch Output. Connect this pin to the inductor and bootstrap capacitor. This pin is driven
up to VIN by the high-side switch during the PWM duty cycle ON-time. The inductor current
drives the SW pin negative during the OFF-time. The ON-resistance of the low-side switch
and the internal body diode fixes the negative voltage. Connect using wide PCB traces
and multiple vias.
4
GND
System Ground. Reference ground of the regulated output voltage. PCB layout requires
extra care. For best results connect to GND with copper and vias.
5
BST
Bootstrap. Requires a capacitor connected between SW and BST pins is required to form
a floating supply across the high-side switch driver.
6
EN/SYNC
Enable. EN=high to enable the MP1475. Apply an external clock to change the switching
frequency. For automatic start-up, connect EN pin to VIN with an 100kΩ resistor.
7
VCC
Internal 5V LDO output. Powers the driver and control circuits are powered from this
voltage. Decouple with a 0.1μF-0.22μF capacitor. Do not use a capacitor ≥0.22μF.
8
FB
Feedback. Connect to the tap of an external resistor divider from the output to GND to set
the output voltage. The frequency fold-back comparator lowers the oscillator frequency
when the FB voltage is below 400mV to prevent current limit runaway during a short-circuit
fault condition. Place the resistor divider as close to the FB pin as possible. Avoid placing
vias on the FB traces.


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