LT1765-1.8_15 Datasheet, PDF (5/20 Pages) Linear Technology – Monolithic 3A, 1.25MHz Step-Down Switching Regulator

LT1765/LT1765-1.8/LT1765-2.5/
LT1765-3.3/LT1765-5
TYPICAL PERFORMANCE CHARACTERISTICS
Minimum Input Voltage for
2.5V Out
3.5
3.3
3.1
2.9
2.7
2.5
0.001
0.01
0.1
LOAD CURRENT (A)
1
1765 G07
SHDN Supply Current
300
V_IN = 15V
250
200
150
100
50
0
0 0.2 0.4 0.6 0.8 1 1.2 1.4
SHUTDOWN VOLTAGE (V)
1765 G08
Input Supply Current
1200
1000
800
UNDERVOLTAGE
LOCKOUT
600
400
200
0
0
5 10 15 20 25 30
INPUT VOLTAGE (V)
1765 G09
Maximum Load Current,
V_OUT = 5V
3.0
2.8
L = 4.7μH
2.6
2.4
L = 2.2μH
2.2
2.0
0
L = 1.5μH
5
10
15
20
25
INPUT VOLTAGE (V)
1765 G11
Current Limit Foldback
4
40
3
30
SWITCH CURRENT
2
20
1
10
FB CURRENT
0
0
0 0.2 0.4 0.6 0.8 1 1.2
FEEDBACK VOLTAGE (V)
1765 G10
Maximum Load Current,
V_OUT = 2.5V
3.0
L = 4.7μH
2.8
L = 2.2μH
2.6
L = 1.5μH
2.4
2.2
0
5
10
15
20
25
INPUT VOLTAGE (V)
1765 G12
1765fd
5