TM
MP1543 — 1.5A, 500KHZ SYNCHRONOUS RECTIFIED STEP-UP CONVERTER
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
Maximum Duty Cycle
vs Temperature
Quiescent Current vs
Temperature
Current Limit vs
Duty Cycle
88.10
88.05
88.00
87.95
87.90
87.85
87.80
380
370
360
350
340
330
320
310
300
1.6
1.4
1.2
1.0
0.8
-40
0
40
80
120
-40
0
40
80
120
0
20
40
60
80
100
TEMPERATURE (°C)
TEMPERATURE (°C)
DUTY CYCLE (%)
MP1543-TPC10
MP1543-TPC11
MP1543-TPC12
PIN FUNCTIONS
Pin # Name Description
1
FB
Regulation Feedback Input. Connect to an external resistive voltage divider from the output to
FB to set the output voltage.
2
3
4
GND Ground.
OUT Supply Input for the MP1543. Connect to the output of the converter.
SW Output Switching Node. SW is the drain of the internal low-side N-Channel MOSFET and
high-side P-Channel MOSFET. Connect the inductor to SW to complete the step-up converter.
5
EN
Regulator On/Off Control Input. A logic high input (VEN > 1.4V) turns on the regulator. A logic
low input (VEN < 0.4V) puts the MP1543 into low current shutdown mode.
MP1543 Rev. 1.0
1/11/2006
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2006 MPS. All Rights Reserved.
4
MPS [ MONOLITHIC POWER SYSTEMS ]
