LTC1475 Linear Technology, LTC1475 Datasheet - Page 14

• Manufacturer Part Number: LTC1475
• Description: Low Quiescent Current High Efficiency Step-Down Converters
• Manufacturer: Linear Technology

TYPICAL APPLICATIONS
LTC1474/LTC1475
14
3.5V TO 18V
** 3 PARALLEL STANDARD RESISTORS
††
* SUMIDA CDRH73-271
†
PROVIDE LEAST EXPENSIVE SOLUTION
(SEE R
AVX TPSC475M035
AVX TPSC107M006
4mA TO 20mA
4mA TO 20mA
V
IN
SENSE
+
IN
IN
SELECTION SECTION)
+
–
4.7 F
35V
†
† †
** MARCON THCS50E1E106Z,
* COILCRAFT DO1608-334
†
†
D2
12V
AVX 1206ZG106Z
1 **
MBR0530
OPTIONAL RESISTOR FOR SENSING LOOP CURRENT BY A/D CONVERTER
MOTOROLA MMBZ5242BL
Figure 11. High Efficiency 3.3V/10mA Output from 4mA to 20mA Loop
††
Figure 10. High Efficiency 3V/100mA Regulator (Design Example)
TO A/D
U
1 **
1 F
3
2 **
7.5M
1M
RUN
RUN
100k
2
1000pF
100k
6
3
8
SENSE
LBI
RUN
1000pF
6
3
8
SENSE
LBI
RUN
LTC1474
GND
V
IN
LTC1474-3.3
7
4
GND
V
LBO
V
SW
IN
FB
7
4
1
2
5
V
LBO
OUT
SW
0.1 F
1
2
5
1M
1%
10pF
1.43M
1%
L*
330 H
D1
MBR0530
L*
270 H
D1
MBR0530
+
10 F**
100 F
6.3V
1474/75 F11
V
3.3V
10mA
OUT
1474/75 F10
††
V
3V
100mA
OUT