MP1527
2A, 1.3MHz
Step-Up Converter
Monolithic Power Systems
Figure 8: Efficiency vs. Load Current (Non-Bootstrapped)
100.00%
95.00%
90.00%
85.00%
80.00%
75.00%
70.00%
65.00%
60.00%
55.00%
50.00%
VOUT = 12V
VIN=3.3V
VIN=5V
VIN=8V
10
100
1000
Load Current (mA)
Figure 9: VIN = 5V, VOUT = 12V @ 500mA Load
Figure 10: Driving Multiple Strings of White LEDs
VIN=2.6
to 25V
V = 5V
IN
10µF
4.7µF
4.7µH
100K
1N5819HW
IN
1µF
1µF
100K
VOUT = 12V
@0.5A
FAULT
FAULT
EN
SW
C2
10µF
Up to
6 LEDs
MBR0530
ON/OFF
91K
IN
SW
FB
per String
SS
10nF
10nF
FAULT
FAULT
BP
FB
COMP
ON/OFF
EN MP1527
C4
10K
60
60
60
COMP
N/A
SS
BP
R3
SGND PGND
10K
5.6K
SGND
PGND
10nF
10nF
C3
5.6nF
4.7nF
MP1527 Rev 1.8_8/31/05
Monolithic Power Systems, Inc.
6
MPS [ MONOLITHIC POWER SYSTEMS ]
