LT1269 Linear Technology, LT1269 Datasheet - Page 3

• Manufacturer Part Number: LT1269
• Description: 4A High Efficiency Switching Regulators
• Manufacturer: Linear Technology

ELECTRICAL C
SYMBOL
V
V
BV
V
I
f
DC (max)
The
temperature range.
Note 1: Measured with V
LIM
FB
FB
SAT
I
I
SW
IN
denotes the specifications which apply over the full operating
PARAMETER
Control Pin Threshold
Normal/Flyback Threshold
on Feedback Pin
Flyback Reference Voltage
Change in Flyback
Reference Voltage
Flyback Reference Voltage
Line Regulation
Flyback Amplifier
Transconductance (gm)
Flyback Amplifier Source
and Sink Current
Output Switch Breakdown
Voltage
Output Switch (Note 1)
“On” Resistance
Control Voltage to Switch
Current Transconductance
Switch Current Limit (Note 2)
Supply Current Increase
During Switch On-Time
Switching Frequency
Maximum Switch Duty Cycle
Flyback Sense Delay Time
Shutdown Mode
Supply Current
Shutdown Mode
Threshold Voltage
C
in hi clamp, V
HARA TERISTICS
FB
C
= 0.8V.
CONDITIONS
Duty Cycle = 0
I
0.05 I
I
3V V
V
I
3V V
I
Duty Cycle = 50%
Duty Cycle = 80%
LT1271
LT1269
LT1271
LT1269
3V V
3V V
FB
FB
FB
SW
C
I
C
= 0.6V
= 50 A
= 50 A
= 50 A
= 10 A
= 1.5mA
IN
IN
IN
IN
FB
V
V
V
V
V
IN
1mA
MAX
MAX
MAX
MAX
= 15V, V
, V
C
= 0.05V
Source
Note 2: For duty cycles (DC) between 50% and 85%, minimum
guaranteed switch current is given by I
Note 3: Minimum input voltage.
Sink
C
= 0.5V, V
FB
= V
REF,
MIN
150
100
0.7
0.5
0.4
4.5
3.2
15
14
15
25
60
50
85
85
80
50
switch pin open, unless otherwise noted.
4
0.45
16.3
0.01
TYP
300
100
100
150
0.9
6.8
0.2
6.4
1.5
32
40
75
25
60
92
90
LIM
LT1271/LT1269
= 2.67 (2 – DC).
MAX
1.08
1.25
0.54
17.6
0.03
0.33
650
115
400
250
300
8.5
18
70
70
40
70
95
95
8
8
UNITS
mA/A
3
mho
%/V
A/V
kHz
kHz
mV
mV
%
%
V
V
V
V
V
V
A
A
V
A
A
A
s