Datasheet

14
LTC1174
LTC1174-3.3/LTC1174-5
1174fe
Low Noise 3V Regulator
Positive-to-Negative (–5V) Converter
TYPICAL APPLICATIO S
U
1174 TA05
3
LTC1174
LB
IN
LB
OUT
I
PGM
GND
V
IN
SHUTDOWN
V
FB
SW
2
7
6
8
1
5
4
50µH
†
V
OUT
3V
450mA
22µF*
25V
×3
1N5818
0.1µF
100µF**
10V
×2
INPUT VOLTAGE
4V TO 12.5V
*
**
†
AVX TPSD226K025
AVX TPSD105K010
COILTRONICS CTX50-4
42k
30k
6.8nF
+
+
*
**
***
D1
†
LOW-BATTERY INDICATOR
IS SET TO TRIP AT V
IN
= 4.4V
AVX TPSD106K035
AVX TPSD105K010
= MBRS130LT3 (SURFACE MOUNT)
1N5818
L1 SELECTION
MANUFACTURER
COILTRONICS
COILCRAFT
SUMIDA
GOWANDA
PART NO.
CTX50-3
DT3316-473
CD54-470
GA10-472K
TYPE
SURFACE MOUNT
SURFACE MOUNT
SURFACE MOUNT
THROUGH HOLE
1174 TA06
INPUT VOLTAGE
4V TO 12.5V
3
LTC1174HV-5
LB
IN
LB
OUT
I
PGM
GND
V
IN
SHUTDOWN
V
OUT
SW
2
7
6
8
1
5
4
L1
†
50µH
V
OUT
–5V
10µF**
35V
×2
D1
0.1µF
100µF***
10V
*LOW-
BATTERY
INDICATOR
4.7K
280k
43k
V
IN
(V)
4
6
8
10
12.5
I
OUT MAX
(mA)
110
140
170
200
235
+
+