Datasheet

5
LT1511
TYPICAL PERFORMANCE CHARACTERISTICS
U
W
Switching Frequency vs
Temperature
V
REF
Line Regulation
TEMPERATURE (°C)
–20
FREQUENCY (kHz)
200 40 80 12060
100
140
1511 • TPC04
210
205
200
195
190
185
180
V
CC
(V)
0
I
CC
(mA)
7.0
6.5
6.0
5.5
5.0
4.5
5
10 15 20
1511 • TPC05
25 30
125°C
25°C
0°C
MAXIMUM DUTY CYCLE
I
CC
vs V
CC
V
CC
(V)
0
∆V
REF
(V)
0.003
0.002
0.001
0
–0.001
–0.002
–0.003
5
10 15 20
1511 • TPC06
25 30
ALL TEMPERATURES
V
C
Pin CharacteristicsMaximum Duty Cycle
I
VA
vs ∆V
OVP
(Voltage Amplifier)
I
VA
(mA)
0
∆V
OVP
(mV)
4
3
2
1
0
0.8
1511• TPC07
0.20.1 0.3 0.5 0.7 0.9
0.4
0.6
1.0
125°C
25°C
TEMPERATURE (°C)
0
DUTY CYCLE (%)
120
1511 • TPC08
40 80
98
97
96
95
94
93
92
91
90
20 60 100 140
V
C
(V)
0 0.2 0.6 1.0 1.4 1.8
I
VC
(mA)
–1.20
–1.08
–0.96
–0.84
–0.72
–0.60
–0.48
–0.36
–0.24
–0.12
0
0.12
1.6
1511 • TPC09
0.4
0.8
1.2
2.0
Switch Current vs Boost Current
vs Boost Voltage
SWITCH CURRENT (A)
0 0.2 0.4 0.6 0.8 1.0 1.2
1.4 1.8 2.01.6
BOOST CURRENT (mA)
50
45
40
35
30
25
20
15
10
5
0
1511 • TPC11
V
CC
= 16V
V
BOOST
= 38V
28V
18V
TEMPERATURE
0
REFERENCE VOLTAGE (V)
2.470
2.468
2.466
2.464
2.462
2.460
2.458
25
50 75 100
LT1511 • TPC12
125 150
Reference Voltage
vs Temperature
PROG Pin Characteristics
V
PROG
(V)
0123
54
I
PROG
(mA)
6
0
–6
1511 • TPC10
125°C
25°C