MP1517
3A, 25V, 1.1MHz
Step-Up Converter
MP1517 Rev. 1.4 www.MonolithicPower.com 1
4/28/2006 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2006 MPS. All Rights Reserved.
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.
EVALUATION BOARD REFERENCE
Board Number Dimensions
EV0043 2.5”X x 2.0”Y x 0.4”Z
FEATURES
• 4A Peak Current Limit
• Low 700mV Feedback Threshold
• Internal 150m 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
APPLICATIONS
• Boost and SEPIC Regulators
• Handheld Computers
• Cell Phone Camera Flash, PDAs
• Digital Still and Video Cameras
“MPS” and “The Future of Analog IC Technology” are Registered Trademarks of
Monolithic Power Systems, Inc.
TYPICAL APPLICATION
MP1517
IN
8
COMP
FB
SW
1
16
9, 10
SGND PGND
5, 13 11, 12
EN
SS
BP
OLS
4
15
3
7
C5
10nF
C4
10nF
C3
10nF
C6
OPTIONAL
OFF ON
V
IN
5V
D1
MBR320
V
OUT
12V
MP1517_TAC_S01
100
95
90
85
80
75
70
65
60
55
50
EFFICIENCY (%)
LOAD CURRENT (mA)
MP1517-EC01
Efficiency vs
Load Current
1 10 100 1000
V
IN
= 5V
V
OUT
= 12V
V
OUT
= 18V
