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MP1494S Folha de dados(PDF) 8 Page - Monolithic Power Systems

Nome de Peças MP1494S
Descrição Electrónicos  High Efficiency 2A, 16V, 500kHz Synchronous Step-Down Converter
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Fabricante Electrônico  MPS [Monolithic Power Systems]
Página de início  http://www.monolithicpower.com
Logo MPS - Monolithic Power Systems

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MP1494S
– SYNCHRONOUS STEP-DOWN CONVERTER
MP1494S Rev. 1.0
www.MonolithicPower.com
8
12/13/2013
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2013 MPS. All Rights Reserved.
PIN FUNCTIONS
Package
Pin #
Name
Description
1
AAM
Advanced Asynchronous Modulation. Connect the tap of 2 resistor dividers to force the
MP1494S into non-synchronous mode under light loads. Drive AAM pin high (VCC) to
force the MP1494S into CCM.
2
IN
Supply Voltage. The MP1494S operates from a 4.5V to 16V input rail. Requires C1 to
decouple the input rail. Connect using a wide PCB trace.
3
SW
Switch Output. Connect using a wide PCB trace.
4
GND
System Ground. This pin is the reference ground of the regulated output voltage, and
PCB layout requires special care. For best results, connect to GND with copper traces
and vias.
5
BST
Bootstrap. Requires a capacitor connected between SW and BST pins to form a floating
supply across the high-side switch driver. A 10
Ω resistor placed between SW and BST
cap is strongly recommended to reduce SW spike voltage.
6
EN/SYNC
Enable/Synchronize. EN high to enable the MP1494S. Apply an external clock to the EN
pin to change the switching frequency.
7
VCC
Bias Supply. Decouple with 0.1
μF-to-0.22μF capacitor. Select a capacitor that does not
exceed 0.22
μF. VCC capacitor should be put closely to VCC pin and GND pin.
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.


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