lt1776 Linear Technology Corporation, lt1776 Datasheet - Page 17

• Manufacturer Part Number: lt1776
• Description: Wide Input Range, High Efficiency, Step-down Switching Regulator
• Manufacturer: Linear Technology Corporation

TYPICAL APPLICATIONS
C1: PANASONIC HFQ 39 F AT 63V
C2: AVX D CASE 100 F 10V
D1: MOTOROLA 100V, 1A,
L1: COILCRAFT DO3316-104
*ANY NPN WITH EMITTER-BASE
Figure 7. Burst Mode Operation Configuration for High Efficiency at Light Load
BREAKDOWN OF <7V CAN BE USED
TPSD107M010R0080
MBRS1100 (T3)
SMD SCHOTTKY
NC
Q2*
2N2369
R7
10M
U
Q1
PN2484
+
90
80
70
60
50
40
30
20
1
C1
V
IN
V
IN
= 10V
6
1
8
= 20V
V
SYNC
SHDN
V
IN
OUT
IN
V
= 30V
LTC1440
LT1776
–
= 40V
LOAD CURRENT (mA)
2
GND
10
V
V
U2
U1
V
IN
IN
+
5
4
7
GND
HYST
V
REF
V
IN
IN
SW
V
(a)
CC
FB
1
(b)
C
–
+
2
3
7
8
4
3
6
5
100
D1
C3
100pF
L1
R5
22k
R6
2.4M
1776 F07b
1000
+
C2
R1
39k
5%
R2
10k
5%
R3
323k
1%
R4
100k
1%
1776 F07a
V
5V
OUT
LT1776
17