Datasheet

27
LT3437
3437fc
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
14V to 3.3V Step-Down Converter with
100µA No Load Quiescent Current
Supply Current
vs Input Voltage
INPUT VOLTAGE (V)
0
0
SUPPLY CURRENT (µA)
40
100
10 20 30 40
3435 TA05
50
200
20
60
80
120
140
160
180
8060 70
TYPICAL APPLICATIO
U
LOAD CURRENT (mA)
0.1
0
EFFICIENCY (%)
20
10
40
50
60
100
100
3437 G01
30
1 10 1000
70
80
90
500
450
400
350
300
250
200
150
100
50
0
POWER LOSS (mW)
EFFICIENCY
POWER LOSS
V
IN
= 12V
V
OUT
= 3.3V
T
A
= 25°C
Efficiency and Power Loss
vs Load Current
V
IN
SHDN
BOOST
LT3437
2.2µF
100V
CER
330pF
0.1µF
0.1µF
100µH
BAS21
SYNC
GND
100µF
6.3V
TANT
V
OUT
3.3V
400mA
V
IN
4.5V TO
80V*
10MQ100N
1500pF
25k
165k
100k
3437 TA04
27pF
SW
C
SS
V
C
FB
*FOR INPUT VOLTAGES ABOVE 60V,
SOME RESTRICTIONS MAY APPLY
V
BIAS