MIC2145 Datasheet, PDF (12/15 Pages) Micrel Semiconductor – High Efficiency 2.5W Boost Converter

MIC2145
Pre-designed Application Circuits
Micrel
V_IN
3.0V-4.2V
C1
10µF/6.3V
Murata
GRM42-6 X5R 106K 6.3 _JP1
R1 R2
100k 10k
L1
4.7µH
Murata
LQH3C4R7M24
VDD
SW
EN
PGND
MIC2145
RSET
FB
SS
C2
0.01µF
SGND
D1
On Semiconductor
MBR0530T1
R4 _C3
1M _100pF
R3
274k
V_OUT
5V
C4
10µF/6.3V
Murata
GRM42-6 X5R 106K 6.3
LED1 LED2
R
R
LEDn
R
V_IN V_OUT Load Ripple Voltage Efficiency
V V mA mV(peak-peak)
%
3.6 5.0 40
<100
85
5V Output
Efficiency
90
85
80
75
70
65
V_IN = 3.6V
601
10
100
1000
OUTPUT CURRENT (mA)
Figure 8. White LED Driver Application (Drives 1 to 10 LEDs in Parallel)
MIC2145
12
May 2003