Datasheet

LT3471
12
3471fb
TYPICAL APPLICATIONS
R
SS1
4.7k
R
SS2
4.7k
CONTROL 1
3471 TA02
C
SS1
0.33μF
C
SS2
0.33μF
C1
10μF
V
IN
2.6V TO 4.2V
Li-Ion
SHDN/SS1 FB1N
9
0V
1.8V
CONTROL 2
0V
1.8V
8
7
SW1
SW2
LT3471
L2
15μH
L3
15μH
GND
FB1P
V
IN
FB2P
FB2N
V
REF
C2
0.1μF
C3
4.7μF
C6
33pF
V
OUT1
7V
500mA WHEN V
IN
= 4.2V
350mA WHEN V
IN
= 3.3V
250mA WHEN V
IN
= 2.6V
V
OUT2
–7V TO –4V
–7V WHEN V
CONTROL
= 0V
–4V WHEN V
CONTROL
= 1
–7V, 300mA WHEN V
IN
= 4.2V
–7V, 250mA WHEN V
IN
= 3.3V
–7V, 200mA WHEN V
IN
= 2.6V
C1, C2: X5R OR X7R 6.3V
C3, C4: X5R OR X7R 10V
C5: XR5 OR X7R 16V
C6: OPTIONAL
D1, D2: ON SEMICONDUCTOR MBRM-120
L1: SUMIDA CR43-2R2
L2: SUMIDA CDRH4D18-100
L3: SUMIDA CDRH4D18-150
C6
75pF
R2
15k
R5
20k
R6
10k
R3
90.9k
R4
15k
R1
105k
C5
1μF
SHDN/SS2
V
IN
10
1
2
3
5
4
11 6
V
IN
C4
10μF
D2
L1
2.2μH
D1
V
CONTROL
0V TO 1V
I
OUT
(mA)
0
50
EFFICIENCY (%)
55
65
70
75
200
400
500
95
3471 TA02b
60
100 300
80
85
90
V
OUT
= 7V
V
IN
= 4.2V
V
IN
= 4.2V
V
IN
= 3.3V
V
IN
= 3.3V
V
IN
= 2.6V
V
IN
= 2.6V
V
OUT
= –7V
Li-Ion OLED Driver Effi ciency
Li-Ion OLED Driver