MP1479 Datasheet: Step-Down Converter





MP1479 Step-Down Converter Datasheet

Part Number MP1479
Description Step-Down Converter
Manufacture MPS
Total Page 20 Pages
PDF Download Download MP1479 Datasheet PDF

Features: MP1479 18V, 1A, 800kHz, High-Efficiency, Synchronous, Step-Down Converter in SO T563 Package DESCRIPTION The MP1479 is a fully integrated, highfrequency, syn chronous, rectified, step-down, switch- mode converter with internal power MOSF ETs. The MP1479 offers a very compact s olution that achieves 1A of continuous output current with excellent load and line regulation over a wide input range . The MP1479 uses synchronous mode oper ation for higher efficiency over the ou tput current load range. Constant-on-ti me (COT) control operation provides ver y fast transient response, easy loop de sign, and very tight output regulation. Full protection features include short -circuit protection (SCP), over-current protection (OCP), under-voltage protec tion (UVP), and thermal shutdown. The M P1479 requires a minimal number of read ily available, standard, external compo nents and is available in a space-savin g SOT563 package. FEATURES  Wide 4. 2V to 18V Operating Input Range  140mΩ/60mΩ Low RDS(ON) Internal.

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MP1479
18V, 1A, 800kHz, High-Efficiency,
Synchronous, Step-Down Converter
in SOT563 Package
DESCRIPTION
The MP1479 is a fully integrated, high-
frequency, synchronous, rectified, step-down,
switch-mode converter with internal power
MOSFETs. The MP1479 offers a very compact
solution that achieves 1A of continuous output
current with excellent load and line regulation
over a wide input range. The MP1479 uses
synchronous mode operation for higher
efficiency over the output current load range.
Constant-on-time (COT) control operation
provides very fast transient response, easy loop
design, and very tight output regulation.
Full protection features include short-circuit
protection (SCP), over-current protection (OCP),
under-voltage protection (UVP), and thermal
shutdown.
The MP1479 requires a minimal number of
readily available, standard, external
components and is available in a space-saving
SOT563 package.
FEATURES
Wide 4.2V to 18V Operating Input Range
140mΩ/60mΩ Low RDS(ON) Internal Power
MOSFETs
190μA Low IQ
Highly Efficient Synchronous Mode
Operation
Power-Save Mode at Light Load
Fast Load Transient Response
800kHz Switching Frequency
Internal Soft Start (SS)
Over-Current Protection (OCP) and Hiccup
Thermal Shutdown
Output Adjustable from 0.8V
Available in a SOT563 Package
APPLICATIONS
Security Cameras
Digital Set-Top Boxes
Flat-Panel Televisions and Monitors
General Purposes
All MPS parts are lead-free, halogen-free, and adhere to the RoHS directive. For
MPS green status, please visit the MPS website under Quality Assurance. “MPS”
and “The Future of Analog IC Technology” are registered trademarks of
Monolithic Power Systems, Inc.
TYPICAL APPLICATION
12V
VIN
C1
22μF
EN
R4
10Ω
VIN BST SW
MP1479 FB
EN GND
C3
1μF
L1
4.7μH
R1
R3 40.2kΩ
47kΩ
R2
13kΩ
3.3V/1A
VOUT
C2
22μF
Efficiency
VOUT = 3.3V, L = 4.7µH, DCR = 24.5mΩ
100
95
90
85
80
75
70
65
60
0.01
Vin=5V
Vin=12V
Vin=18V
0.1
LOAD CURRENT(A)
1
MP1479 Rev. 1.0
5/4/2018
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2018 MPS. All Rights Reserved.
1

                    
                    






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