LTC1701 LINER [Linear Technology], LTC1701 Datasheet - Page 10

• Manufacturer Part Number: LTC1701
• Description: 1MHz Step-Down DC/DC Converter in SOT-23
• Manufacturer: LINER [Linear Technology]

APPLICATIO S I FOR ATIO
LTC1701
5. Keep sensitive components away from the SW pin. The
input capacitor C
the resistors R1, R2, R
from the SW trace and the components L1 and D1.
10
TYPICAL APPLICATIO S
IN
, the compensation capacitor C
U
C1: AVX TAJA156M010R
C2: AVX TAJA226M006R
C4: TAIYO YUDEN LMK212BJ105MG
C5: TAIYO YUDEN JMK212BJ475MG
D1: MBRM120L
L1: MURATA LQH3C4R7M24
2.5V TO 5.5V
C
C1, C2: AVX TAJA156M010R
C4: TAIYO YUDEN EMK107BJ104MA
D1: MBR0520
L1: MURATA LQH3C4R7M24 OR TAIYO YUDEN LEMC3225B4R7M
2.7V TO 5.5V
and R
U
V
15 F
IN
C1
V
+
15 F
IN
S
C1
should be routed away
U
+
W
C4
1 F
3- to 4-Cell NiCd/NiMH to 2.5V Converter
5.1k
1M
R4
R3
2mm Nominal Height 1.5V Converter
C4
0.1 F
5.1k
1M
R4
R3
U
C3
330pF
C
V
I
TH
IN
and all
/RUN
C3
330pF
LTC1701
V
I
TH
GND
IN
/RUN
LTC1701
GND
SW
V
FB
Figure 4. LTC1701 Layout Diagram (See Board Layout Checklist)
V
BOLD LINES INDICATE HIGH CURRENT PATHS
OUT
V
SW
FB
C
OUT
R1
100k
D1
4.7 H
+
L1
20k
R2
R1
121k
D1
4.7 H
121k
L1
R2
R2
R1
22 F
L1
C2
D1
+
+
1
2
3
1701 TA01
C2
15 F
V
(2.5V/0.5A)
OUT
SW
GND
V
FB
1701 TA02
C5
4.7 F
V
(1.5V/0.5A)
LTC1701
OUT
I
TH
/RUN
V
IN
5
4
+
R
C
C
C
R
IN
C
S
1701 F04
V
IN