Linear Technology DC193 Demo Manual page 2

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