MIC2145

Micrel

MIC2145

12

May 2003

Pre-designed Application Circuits

L1

4.7

µH

Murata

LQH3C4R7M24

MIC2145

D1

On Semiconductor

MBR0530T1

RSET

EN

VDD

SW

R4

1M

R3

274k

C3

100pF

5V

PGND

FB

SGND

R1

100k

JP1

3.0V-4.2V

SS

C2

0.01

µF

C1

10

µF/6.3V

Murata

GRM42-6 X5R 106K 6.3

R2

10k

C4

10

µF/6.3V

Murata

GRM42-6 X5R 106K 6.3

LED1

RR

R

LED2

LEDn

V

N

I

V

T

U

O

d

a

o

Le

g

a

t

l

o

V

e

l

p

p

i

Ry

c

n

e

i

c

i

f

f

E

VV

A

m)

k

a

e

p

-

k

a

e

p

(

V

m%

6

.

30

.

50

40

0

1

<5

8

60

65

70

75

80

85

90

1

10

100

1000

OUTPUT CURRENT (mA)

5V Output

Efficiency

V

Figure 8. White LED Driver Application (Drives 1 to 10 LEDs in Parallel)