LT1576/LT1576-5
ABSOLUTE
MAXIMUM
RATINGS
(Note 1)
PACKAGE/ORDER INFORMATION
ORDER PART NUMBER
LT1576IS8
LT1576IS8-SYNC
LT1576IS8-5
LT1576IS8-5 SYNC
S8 PART MARKING
1576
1576SN
1576I
576ISN
15765
5765SN
1576I5
76I5SN
Input Voltage .......................................................... 25V
BOOST Pin Above Input Voltage ............................. 10V
SHDN Pin Voltage .................................................. 6.5V
BIAS Pin Voltage ...................................................... 7V
FB Pin Voltage (Adjustable Part) ............................ 3.5V
FB Pin Current (Adjustable Part) ............................ 1mA
SYNC Pin Voltage ..................................................... 7V
Operating Junction Temperature Range
LT1576C ............................................... 0°C to 125° C
LT1576I ........................................... – 40°C to 125°C
Storage Temperature Range ................ – 65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
TOP VIEW
V
SW
1
V
IN
2
BOOST 3
GND 4
8 SHDN OR
SYNC*
7 FB OR SENSE*
6
5
V
C
BIAS
S8 PACKAGE
8-LEAD PLASTIC SO
θ
JA
= 80°C/ W WITH FUSED GROUND PIN
CONNECTED TO GROUND PLANE OR
LARGE LANDS
*Default is the adjustable output voltage device with FB pin and shutdown
function. Option -5 replaces FB with SENSE pin for fixed 5V output
applications. -SYNC replaces SHDN with SYNC pin for applications
requiring synchronization. Consult factory for Military grade parts.
ELECTRICAL CHARACTERISTICS
The
q
denotes specifications which apply over the full operating temperature
range, otherwise specifications are T
A
, T
J
= 25°C, V
IN
= 15V, V
C
= 1.5V, Boost = V
IN
+ 5V, switch open, unless otherwise noted.
PARAMETER
Feedback Voltage
Sense Voltage (Fixed 5V)
All Conditions
SENSE Pin Resistance
Reference Voltage Line Regulation
Feedback Input Bias Current
Error Amplifier Voltage Gain
Error Amplifier Transconductance
V
C
Pin to Switch Current Transconductance
Error Amplifier Source Current
Error Amplifier Sink Current
V
C
Pin Switching Threshold
V
C
Pin High Clamp
Switch Current Limit
Slope Compensation (Note 9)
Switch On Resistance (Note 7)
Maximum Switch Duty Cycle
V
C
Open, V
FB
= 1.1V, DC
≤
50%
DC = 80%
I
SW
= 1.5A
q
q
q
CONDITIONS
5V
≤
V
IN
≤
25V, V
OL
+ 0.2V
≤
V
CC
≤
V
OH
– 0.2V
q
MIN
1.195
1.18
4.94
4.90
13
TYP
1.21
5.0
18.5
0.01
0.5
MAX
1.225
1.24
5.06
5.10
26
0.03
2
1300
1700
190
200
UNITS
V
V
V
V
kΩ
%/V
µA
µMho
µMho
A/ V
µA
µA
V
V
5V
≤
V
IN
≤
25V
q
(Notes 2, 8)
∆I
(V
C
) =
±10µA
(Note 8)
q
200
800
400
40
50
400
1050
1.5
V
FB
= 1V
V
FB
= 1.4V
Duty Cycle = 0
q
q
110
130
0.8
2.1
1.5
2
0.3
0.2
3.50
0.35
0.45
V
FB
= 1.1V
q
90
86
94
94
2
U
W
U
U
W W
W
A
A
Ω
Ω
%
%
LINER [ LINEAR TECHNOLOGY ]
