MP1474 Datasheet, PDF (1/16 Pages) Monolithic Power Systems – High-Efficiency, 2A, 16V, 500kHz Synchronous, Step-Down Converter

The Future of Analog IC Technology
DESCRIPTION
The MP1474 is a high-frequency, synchronous,
rectified, step-down, switch-mode converter
with built-in power MOSFETs. It offers a very
compact solution to achieve a 2A continuous
output current with excellent load and line
regulation over a wide input supply range. The
MP1474 has synchronous mode operation for
higher efficiency over the output current load
range.
Current-mode operation provides fast transient
response and eases loop stabilization.
Full protection features include over-current
protection and thermal shut down.
The MP1474 requires a minimal number of
readily-available standard external components,
and is available in a space-saving 8-pin
TSOT23 package.
MP1474
High-Efficiency, 2A, 16V, 500kHz
Synchronous, Step-Down Converter
FEATURES
 Wide 4.5V-to-16V Operating Input Range
 100mΩ/40mΩ Low R_DS(ON) Internal Power
MOSFETs
 High-Efficiency Synchronous Mode
Operation
 Fixed 500kHz Switching Frequency
 Synchronizes from a 200kHz-to-2MHz
External Clock
 Power-Save Mode at Light Load
 Internal Soft-Start
 Power Good Indicator
 OCP Protection and Hiccup
 Thermal Shutdown
 Output Adjustable from 0.8V
 Available in an 8-pin TSOT-23 Package
APPLICATIONS
 Notebook Systems and I/O Power
 Digital Set-Top Boxes
 Flat-Panel Television and Monitors
 Distributed Power Systems
All MPS parts are lead-free and adhere to the RoHS directive. For MPS green
status, please visit MPS website under Quality Assurance. “MPS” and “The
Future of Analog IC Technology” are Registered Trademarks of Monolithic
Power Systems, Inc.
TYPICAL APPLICATION
4.5V-16V
VIN
C1
22
EN/
SYNC
C5
R5
0.1
100k
2 _IN
5
R3
20
BST
MP1474
6 _EN/SYNC
SW ³
C4
L1
7 _VCC
R6
FB ⁸
16k
1 _PG
GND
4
3.3V/2A
C2
47 _R1
40.2k
R2
13k
Efficiency vs.
Output Current
100V^{OUT=3.3V, IOUT=0.01A-2A}
95
90
V_IN=5V
85
V_IN=12V
80
75
V_IN=16V
70
65
60
55
50
0.0 0.4 0.8 1.2 1.6 2.0
OUTPUT CURRENT (A)
MP1474 Rev. 1.0
www.MonolithicPower.com
1
9/26/2012
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