DC1658A - Schematic

1
REVISION HISTORY
VIN
2.7V-20.0V
E1
C1
2.2uF
25V
10%
0805
U1 *
6.3V
0402
C3
4.7uF
6.3V
0603
7
CAP
VIN2
1
EN
2
JP3
11
JP4
3
1
1
ON
D0
9
2
PRODUCTION FAB
SW
5
VOUT
6
PGOOD
D1
JP5
10
DATE
8-23-10
J.DREW
VOUT **
50mA
E6
22uH
IND-LPS5030
C4
100uF
6.3V
1206
20%
1
PULLUP
GND
E7
0
8
1
0
0
1Meg
PGOOD
E8
3
3
1
D1
R3
JP2
1
D0
-
L1
VIN
1
JP1
APPROVED
3
OFF
3
STBY
3
EN
DESCRIPTION
4
STBY
GND
REV
1
GND
E2
C2
1uF
ECO
A
EN
E3
R1
ASSEMBLY TYPE * / OUTPUT VOLTAGE SETTINGS **
100K
STBY
E4
GND
E5
A
GND
E9
R2
100K
CUSTOMER NOTICE
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A
CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;
HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
U1 *
-A
-B
LTC3388-1
LTC3388-3
VOUT **
1.2V
1.5V
1.8V
2.5V
2.8V
3.0V
3.3V
5.0V
D1
D0
0
0
0
1
1
0
1
1
0
0
0
1
0
1
1
APPROVALS
PCB DES.
NC
APP ENG.
J.DREW
TECHNOLOGY
1
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900 www.linear.com
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
TITLE: SCHEMATIC
20V HIGH EFFICIENCY NANOPOWER STEP-DOWN REGULATOR
SIZE
SCALE = NONE
1
IC NO.
N/A
LTC3388EMSE-1 / LTC3388EMSE-3
DEMO CIRCUIT 1658A-A/B
DATE:
8-23-10
SHEET 1
REV.
2
OF
1
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