ltc3704ems-trpbf Linear Technology Corporation, ltc3704ems-trpbf Datasheet - Page 25

• Manufacturer Part Number: ltc3704ems-trpbf
• Description: Wide Input Range, No Rsense Positive-to-negative Dc/dc Controller
• Manufacturer: Linear Technology Corporation

APPLICATIO S I FOR ATIO
100mV/DIV
V
I
OUT
0.5A/DIV
OUT
Figure 25. Maximum Output Current vs Input Voltage
(AC)
(DC)
Figure 27. Load Step Response at 3V Input
V
1.2A
IN
= 3V
0.6A
3
2
1
0
3.0
4.7nF
U
14.7k
C
C1
R
3.5
C
INPUT VOLTAGE (V)
250μs/DIV
U
D1: DIODES INC B320B
L1, L2: BH ELECTRONICS BH 510-1009
M1: SILICONIX Si9426
4.0
R
80.6k
1%
2.49k
T
R
1%
FB1
W
1
2
3
4
5
Figure 24. 3V to 5V Input, –8V at 1.2A Output Converter
4.5
RUN
I
NFB
FREQ
MODE/SYNC
TH
13.7k
LTC3704
3704 F25
R
1%
FB2
3704 F27
5.0
INTV
SENSE
GATE
U
GND
V
CC
IN
10
6
8
7
9
C
4.7μF
X5R
VCC
100mV/DIV
V
I
OUT
OUT
0.5A/DIV
C
47μF
X5R
L1*
M1
(DC)
(AC)
IN
Figure 26. Output Efficiency at 3V and 5V Input
•
Figure 28.Load Step Response at 5V Input
V
1.2A
IN
22μF
X5R
C
DC
D1
= 3V
100
95
90
85
80
75
70
65
60
55
50
0.6A
0.001
•
L2*
3704 F24
0.01
OUTPUT CURRENT (A)
250μs/DIV
C
100μF
X5R
–8.0V
V
3V to 5V
GND
V
1.2A to 2.5A
OUT
IN
OUT
0.1
V
IN
V
IN
1
= 5V
= 3V
3704 F26
LTC3704
10
3704 F27
25
3704fb