Datasheet

5
LTC1929/LTC1929-PG
TYPICAL PERFOR A CE CHARACTERISTICS
UW
Supply Current vs Input Voltage
and Mode EXTV
CC
Voltage Drop
INTV
CC
and EXTV
CC
Switch
Voltage vs Temperature
INPUT VOLTAGE (V)
05
0
SUPPLY CURRENT (µA)
400
1000
10
20
25
1929 G04
200
800
600
15
30
35
ON
SHUTDOWN
V
OUT
= 5V
V
EXTVCC
= V
OUT
CURRENT (mA)
0
EXTV
CC
VOLTAGE DROP (mV)
150
200
250
40
1929 G05
100
50
0
10
20
30
50
LTC1929
LTC1929-PG
TEMPERATURE (°C)
–50
INTV
CC
AND EXTV
CC
SWITCH VOLTAGE (V)
4.95
5.00
5.05
25 75
1929 G06
4.90
4.85
–25 0
50 100 125
4.80
4.70
4.75
INTV
CC
VOLTAGE
EXTV
CC
SWITCHOVER THRESHOLD
Maximum Current Sense Threshold
vs Percent on Nominal Output
Voltage (Foldback)
Internal 5V LDO Line Reg
Maximum Current Sense Threshold
vs Duty Factor
INPUT VOLTAGE (V)
0
4.8
4.9
5.1
15 25
1929 G07
4.7
4.6
510
20 30 35
4.5
4.4
5.0
INTV
CC
VOLTAGE (V)
I
LOAD
= 1mA
DUTY FACTOR (%)
0
0
V
SENSE
(mV)
25
50
75
20 40 60 80
1929 G08
100
PERCENT ON NOMINAL OUTPUT VOLTAGE (%)
0
V
SENSE
(mV)
40
50
60
100
1929 G09
30
20
0
25
50
75
10
80
70
Maximum Current Sense Threshold
vs Sense Common Mode Voltage
Maximum Current Sense Threshold
vs V
RUN/SS
(Soft-Start)
Current Sense Threshold
vs I
TH
Voltage
V
RUN/SS
(V)
0
0
V
SENSE
(mV)
20
40
60
80
1234
1929 G10
56
V
SENSE(CM)
= 1.6V
COMMON MODE VOLTAGE (V)
0
V
SENSE
(mV)
72
76
80
4
1929 G11
68
64
60
1
2
3
5
V
ITH
(V)
0
V
SENSE
(mV)
30
50
70
90
2
1929 G12
10
–10
20
40
60
80
0
–20
–30
0.5
1
1.5
2.5