TM
MP1543 — 1.5A, 500KHZ SYNCHRONOUS RECTIFIED STEP-UP CONVERTER
TYPICAL PERFORMANCE CHARACTERISTICS
Circuit on front page, VIN = 2.4V, VOUT = 3.3V, TA = +25°C, unless otherwise noted.
Discontinuous Mode
Operation
Efficiency vs
Load Current
Efficiency vs
Load Current
I
= 25mA
LOAD
100
90
80
70
60
50
40
30
100
90
80
70
60
50
40
30
V
=3V
V
=4.2V
IN
IN
V
=3.6V
IN
V
SW
2V/div.
V
=2.4V
IN
V
AC
10mV/div.
OUT
V
=1.8V
IN
V
=2.4V
IN
I
INDUCTOR
0.1A/div.
V
=5V
OUT
1
10
100
1000
1
10
100
1000
MP1543-TPC03
LOAD CURRENT (mA)
LOAD CURRENT (mA)
MP1543-TPC01
MP1543-TPC02
Continuous Mode
Operation
Transient Response
LOAD
w/o Feed-Forward Capacitor
Transient Response
I
= 40mA to 400mA Step
I
= 40mA to 400mA Step
LOAD
with 220pF Feed-Forward Capacitor
I
= 400mA
LOAD
V
AC
V
AC
OUT
OUT
100mV/div.
100mV/div.
V
SW
2V/div.
V
AC
OUT
50mV/div.
I
I
I
LOAD
LOAD
INDUCTOR
0.2A/div.
0.2A/div.
0.2A/div.
MP1543-TPC04
MP1543-TPC05
MP1543-TPC06
Feedback Voltage vs
Temperature
Switching Frequency
vs Temperature
1.190
1.186
1.182
1.178
1.174
1.170
540
530
520
510
500
490
480
470
460
V
EN
2V/div.
V
SW
2V/div.
V
OUT
2V/div.
-40
0
40
80
120
-40
0
40
80
120
MP1543-TPC07
TEMPERATURE (°C)
TEMPERATURE (°C)
MP1543-TPC08
MP1543-TPC09
MP1543 Rev. 1.0
1/11/2006
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3
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