Linear Technology DC193, Демонстрационное руководство, Страница: 2 / 8

2
DEMO MANUAL DC193
NO DESIGN SWITCHER
PACKAGE A N D SCHE M ATIC DIAGRA M S
W W U
Figure 1. DC193 Schematic Diagram
1 13
LB
OUT
SHDN
I
TH
PWR V
IN
PWR V
IN
C
T
PGND
SENSE
+
SENSE
–
V
FB
SGND
LTC1626
3
10
6
5
12
LB
IN
4
V
IN
V
OUT
SW
2 14
8
7
9
11
R1
22K
R2
1K
D1
MBR0520LT1
(J1A = 2.5V)
(J1B = 3.3V)
(J1C = ADJ)
*MOVE JUMPER TO J1C AND
ADD RESISTOR, R6, FOR V
OUT
ADJUST
R6 = 10k/[(V
OUT
/1.25) – 1]
R
SENSE
0.1
Ω
L1
22
µ
H
DC193 • SCHEMATIC
TOP VIEW
S14 PACKAGE
14-LEAD PLASTIC SOIC
1
2
3
4
5
6
7
14
13
12
11
10
9
8
PWR V
IN
V
IN
LB
OUT
LB
IN
C
T
I
TH
SENSE
–
SW
PWR V
IN
PGND
SGND
SHDN
V
FB
SENSE
+
C3
0.1
µ
F
16V
+
C
IN
47
µ
F
10V
V
IN
LB
IN
LB
OUT
SHDN
C1
3900pF C2
270pF
R4
10k
1%
J1A
R5
6.04k
1%
J1B
R6*
J1C
C5
100pF
C4
1000pF
+
C
OUT
100
µ
F
6.3V
R3
10k
1%
LTC1626
PERFOR M A N CE SU MM ARY
U W W W
PARAMETER CONDITION VALUE
Maximum Output Current 0.6A
Typical Switch ON Resistance T
J
= 25°C, V
IN
= 4.5V 0.32
T
J
= 25°C, V
IN
= 3.5V 0.40
T
J
= 25°C, V
IN
= 2.5V 0.50
SHDN Pin Thresholds Minimum Voltage for the LTC1626 to be Shutdown V
IN
–0.4V
Minimum Voltage for the LTC1626 to be Active 0.4V
Low Battery Threshold Voltage at LBI Input Pin 1.25 ±0.1V
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