Datasheet

5
LT1505
1505fc
TYPICAL PERFORMANCE CHARACTERISTICS
UW
I
BAT
(A)
0
EFFICIENCY (%)
105
100
95
90
85
80
4
1505 G01
1
2
3
5
V
IN
= 19V
V
BAT
= 12.6V
Efficiency of Figure 1 Circuit
I
VA
(mA)
0
∆V
FB
(mV)
4
3
2
1
0
0.8
1505 G04
0.20.1 0.3 0.5 0.7 0.9
0.4
0.6
1.0
125°C
25°C
V
CC
(V)
15
14
13
12
11
10
I
CC
(mA)
1505 G06
10 13
16
19 22 25
0°C
25°C
125°C
I
GBIAS
(mA)
9.2
9.1
9.0
8.9
8.8
8.7
8.6
8.5
8.4
8.3
8.1
V
GBIAS
(V)
1505 G02
0 –2–4–6
–8
–10
–12 –14 –16 –18 –20
0°C
25°C
125°C
V
GBIAS
vs I
GBIAS
∆V
FB
vs I
VA
(Voltage Amplifier)
TEMPERATURE (°C)
0 255075100
THRESHOLD (mV)
125
1505 G05
98
96
94
92
90
88
Current Limit Amplifier
CL1 Threshold
I
CC
vs V
CC
JUNCTION TEMPERATURE (°C)
0
REFERENCE VOLTAGE (V)
2.470
2.468
2.466
2.464
2.462
2.460
2.458
25
50 75 100
1505 G09
125 150
Reference Voltage vs Temperature
V
PROG
(V)
0123
54
I
PROG
(mA)
6
0
–6
1505 G07
125°C
CURRENT FEEDBACK
AMPLIFIER OPEN LOOP
25°C
PROG Pin Characteristics
V
C
(V)
–1.2
–1.0
–0.8
–0.6
–0.4
–0.2
0
0.2
0.4
0.6
0.8
1.0
I
VC
(mA)
1505 G08
0 0.4 0.60.2
0.8 1.0
1.2 1.4 1.6 1.8 2.0
V
C
Pin Characteristics
V
REF
Line Regulation
V
CC
(V)
0
∆V
REF
(V)
0.003
0.002
0.001
0
–0.001
–0.002
–0.003
5
10 15 20
1505 G03
25 30
ALL TEMPERATURES
0°C ≤ T
J
≤ 125°C