TM
MP1543 — 1.5A, 500KHZ SYNCHRONOUS RECTIFIED STEP-UP CONVERTER
TYPICAL PERFORMANCE CHARACTERISTICS
(continued)
Maximum Duty Cycle
vs Temperature
88.10
MAX DUTY CYCLE (%)
Quiescent Current vs
Temperature
380
370
CURRENT LIMIT (A)
Current Limit vs
Duty Cycle
1.6
88.05
88.00
87.95
87.90
87.85
87.80
-40
0
40
80
TEMPERATURE (°C)
120
360
350
340
330
320
310
300
-40
0
40
80
TEMPERATURE (°C)
120
1.4
1.2
1.0
0.8
0
20
40
60
80
DUTY CYCLE (%)
100
MP1543-TPC10
MP1543-TPC11
MP1543-TPC12
PIN FUNCTIONS
Pin #
1
2
3
4
5
Name Description
FB
GND
OUT
SW
EN
Regulation Feedback Input. Connect to an external resistive voltage divider from the output to
FB to set the output voltage.
Ground.
Supply Input for the MP1543. Connect to the output of the converter.
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.
Regulator On/Off Control Input. A logic high input (V
EN
> 1.4V) turns on the regulator. A logic
low input (V
EN
< 0.4V) puts the MP1543 into low current shutdown mode.
MP1543 Rev. 1.0
1/11/2006
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