Datasheet

LTC3025-1/LTC3025-2/
LTC3025-3/LTC3025-4
5
30251234ff
V
IN
No Load Operating Current
V
IN
Shutdown Current Adjust Voltage vs Temperature
SHDN Threshold vs Temperature Current Limit vs V
IN
Voltage
Burst Mode DC/DC Buck Ripple
Rejection
Typical perForMance characTerisTics
V
IN
(V)
0.5
10
125°C
85°C
25°C
–40°C
12
14
4.5
30251234 G04
8
6
1.5 2.5 3.5 5.5
4
2
0
I
IN
(µA)
V
BIAS
= 5V
V
OUT
= 0.8V
V
IN
(V)
0.5
5
25°C
–40°C
6
7
4.5
30251234 G05
4
3
1.5 2.5 3.5 5.5
2
1
0
I
IN
(µA)
85°C
V
BIAS
= 5V
TEMPERATURE (°C)
–50
395
ADJUST VOLTAGE (mV)
396
398
399
400
405
402
0
50
75
30251234 G06
397
403
404
401
–25
25
100
125
V
BIAS
= 3.6V
V
IN
= 1.5V
I
OUT
= 10µA
TEMPERATURE (°C)
–50
0
SHDN THRESHOLD (mV)
100
300
400
500
1000
700
0
50
75
30251234 G07
200
800
900
600
–25
25
100
125
V
BIAS
= 2.5V
V
BIAS
= 5V
V
IN
(V)
0
CURRENT LIMIT (mA)
600
800
1000
3
5
30251234 G08
400
200
0
1 2 4
1200
1400
1600
6
V
IN
AC
100mV/DIV
V
OUT
AC
10mV/DIV
V
IN
= 1.8V
V
OUT
= 1.5V
C
OUT
= 1µF
I
OUT
= 50mA
10µs/DIV
30251234 G09
(T
A
= 25°C unless otherwise noted)
V
IN
to V
OUT
Dropout Voltage
vs I
OUT
Operating BIAS Current
vs Output Current BIAS No Load Operating Current
I
OUT
(mA)
0
DROPOUT VOLTAGE (mV)
40
80
120
20
60
100
100 200 300 400
30251234 G01
500500 150 250 350 450
T
A
= –40°C
T
A
= 125°C
T
A
= 25°C
V
BIAS
= 2.8V
V
IN
= 1.4V
I
OUT
(mA)
0.01
I
BIAS
(µA)
150
200
250
10
1000
30251234 G02
100
50
0
0.1 1 100
300
350
500
400
450
–40°C
125°C
25°C
V
BIAS
(V)
2.5
I
BIAS
(µA)
30
40
4
5
30251234 G03
20
10
0
3 3.5 4.5
60
50
70
80
5.5
V
IN
= 1.5V
V
OUT
= 1.2V
125°C
25°C
–40°C