TM
MP2109 – DUAL 1.2MHz 800mA SYNCHRONOUS STEP-DOWN CONVERTER
TYPICAL PERFORMANCE CHARACTERISTICS
VIN1/IN2 = 3.3V, VOUT1 = 1.8V, VOUT2 = 1.2V, L1/2 = 4.7µH, CIN1/IN2 = 4.7µF, COUT1/OUT2 = 10µF, TA = +25°C,
unless otherwise noted.
Efficiency vs
Load Current
Feedback Voltage vs
Temperature
100
90
80
70
60
50
0.606
0.604
0.602
0.600
0.598
0.596
0.594
V
=1.8V
OUT1
V
=1.2V
OUT2
-20
0.0
0.2
0.4
0.6
0.8
-40
0
+20 +40 +60 +80 +100
LOAD CURRENT (A)
TEMPERATURE (°C)
MP2109-TPC01
MP2109-TPC02
Load Transient
OUT
Medium Load Operation
Heavy Load Operation
(I
=0mA to 500mA Step)
(I
=400mA)
OUT
(I
=800mA)
OUT
V
V
SW
SW
V
OUT AC
2V/div.
2V/div.
100mV/div.
V
OUT AC
V
OUT AC
I
20mV/div.
L
20mV/div.
0.5A/div.
I
L
I
I
L
LOAD
0.5A/div.
200mA/div.
500mA/div.
400ns/div
400ns/div
MP2109-TPC03
MP2109-TPC04
MP2109-TPC05
Short Circuit Protection
(No Load)
Short Circuit Recovery
(No Load)
Startup from Shutdown
V
EN
2V/div
V
OUT
V
OUT
1V/div
1V/div
V
OUT
1V/div
I
I
I
L
L
L
0.5A/div
0.5A/div
0.5A/div
MP2109-TPC07
MP2109-TPC08
MP2109-TPC06
MP2109 Rev.1.3
2/21/2006
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3
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