Datasheet

4
LTC1625
TYPICAL PERFOR A CE CHARACTERISTICS
UW
INPUT VOLTAGE (V)
0
70
EFFICIENCY (%)
75
80
85
90
100
5
10 15 20
1625 G02
25 30
95
I
LOAD
= 2A
I
LOAD
= 200mA
FIGURE 1 CIRCUIT
Efficiency vs Input Voltage,
V
OUT
= 3.3V
V
IN
– V
OUT
Dropout Voltage
vs Load Current
LOAD CURRENT (A)
0
V
IN
– V
OUT
(mV)
200
300
4
1625 G06
100
0
1
2
3
5
400
FIGURE 1 CIRCUIT
V
OUT
= 5V – 5% DROP
Efficiency vs Load Current
LOAD CURRENT (A)
0.001
EFFICIENCY (%)
70
80
10
1625 G01
60
50
0.01
0.1
1
100
90
BURST
MODE
OPERATION
CONTINUOUS
MODE
V
IN
= 10V
V
OUT
= 5V
EXTV
CC
= V
OUT
Load Regulation
LOAD CURRENT (A)
0
∆V
OUT
(%)
–0.10
–0.05
0
4
1625 G04
–0.15
–0.20
–0.25
1
2
3
5
FIGURE 1 CIRCUIT
Input and Shutdown Current
vs Input Voltage
INPUT VOLTAGE (V)
05
0
INPUT CURRENT (µA)
SHUTDOWN CURRENT (µA)
400
1000
10
20
25
1625 G07
200
800
600
0
20
50
10
40
30
15
30
35
EXTV
CC
OPEN
EXTV
CC
= 5V
SHUTDOWN
Efficiency vs Input Voltage,
V
OUT
= 5V
INPUT VOLTAGE (V)
0
70
EFFICIENCY (%)
75
80
85
90
100
5
10 15 20
1625 G02
25 30
95
I
LOAD
= 2A
I
LOAD
= 200mA
FIGURE 1 CIRCUIT
I
TH
Pin Voltage vs Load Current
LOAD CURRENT (A)
0
V
ITH
(V)
2.0
2.5
3.0
35
1625 G05
1.5
1.0
12
467
0.5
0
FIGURE 1 CIRCUIT
V
IN
= 20V
V
OUT
= 5V
CONTINUOUS
MODE
Burst Mode
OPERATION
INTV
CC
LOAD CURRENT (mA)
0
EXTV
CC
– INTV
CC
(mV)
300
400
500
40
1625 G09
200
100
0
10
20
30
50
EXTV
CC
Switch Drop
vs INTV
CC
Load Current
INTV
CC
Load Regulation
INTV
CC
LOAD CURRENT (mA)
0
∆INTV
CC
(%)
–1.0
–0.5
0
40
1625 G08
–1.5

–2.0
–2.5
10
20
30
50