MP1517
3A, 25V, 1.1MHz
Step-Up Converter
The Future of Analog IC Technology
DESCRIPTION
The MP1517 is a 3A, fixed frequency step-up
converter ideal for medium-to-high current
step-up, flyback and SEPIC applications. The
high 1.1MHz switching frequency allows for
smaller external components producing a
compact solution for size constrained cameras,
PDAs and cell phones. The low 0.7V feedback
voltage offers higher efficiency in white LED
driver applications including cell phone camera
flash. The MP1517 regulates the output voltage
up to 25V with efficiencies as high as 95%.
Soft-start, cycle-by-cycle current limiting, and
input
under
voltage
lockout
prevent
overstressing or damage to sensitive external
circuitry at startup and output short-circuit
conditions. Current-mode regulation and
external compensation components allow the
MP1517 control loop to be optimized over a
wide variety of input voltage, output voltage,
and load current conditions. The MP1517 is
available in the thermally enhanced QFN16
(4mm x 4mm) package.
FEATURES
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4A Peak Current Limit
Low 700mV Feedback Threshold
Internal 150mΩ Power Switch
Input Range of 2.6V to 25V
Up to 95% Efficiency
Zero Current Shutdown Mode
Under Voltage Lockout Protection
Open Load Protection
Soft-Start Operation
Thermal Shutdown
Tiny 4mm x 4mm 16-Pin QFN Package
Boost and SEPIC Regulators
Handheld Computers
Cell Phone Camera Flash, PDAs
Digital Still and Video Cameras
APPLICATIONS
“MPS” and “The Future of Analog IC Technology” are Registered Trademarks of
Monolithic Power Systems, Inc.
EVALUATION BOARD REFERENCE
Board Number
EV0043
Dimensions
2.5”X x 2.0”Y x 0.4”Z
TYPICAL APPLICATION
V
IN
5V
Efficiency vs
Load Current
100
8
IN
4
15
9, 10
D1
MBR320
95
EFFICIENCY (%)
V
OUT
12V
OFF ON
EN
SS
SW
90
85
80
75
70
65
60
55
50
1
V
OUT
= 12V
C4
10nF
C5
10nF
3
7
MP1517
BP
OLS
SGND
5, 13
FB
16
1
COMP
PGND
11, 12
V
OUT
= 18V
V
IN
= 5V
10
100
LOAD CURRENT (mA)
1000
MP1517-EC01
C3
10nF
C6
OPTIONAL
MP1517_TAC_S01
MP1517 Rev. 1.4
4/28/2006
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2006 MPS. All Rights Reserved.
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