LT1176 Linear Technology, LT1176 Datasheet - Page 2

• Manufacturer Part Number: LT1176
• Description: Step-Down Switching Regulator
• Manufacturer: Linear Technology

A
LT1176/LT1176-5
Input Voltage .......................................................... 38V
Switch Voltage With Respect to Input Voltage ........ 50V
Switch Voltage With Respect to Ground Pin
(V
Feedback Pin Voltage....................................... – 2V, 10V
Shutdown Pin Voltage (Not to Exceed V
Status Pin Voltage
I
Maximum Operating Ambient Temperature Range
Maximum Operating Junction Temperature Range
Storage Temperature Range ................ – 65 C to 150 C
Lead Temperature (Soldering, 10 sec) 300 C
*These thermal resistance numbers are for typical mounting technique. Lower thermal resistance
ELECTRICAL C
PARAMETER
Switch “ON” Voltage (Note 1)
Switch “OFF” Leakage
Supply Current (Note 2)
Minimum Supply Voltage
Switch Current Limit (Note 4)
Maximum Duty Cycle
Switching Frequency
Switching Frequency Line Regulation
Error Amplifier Voltage Gain (Note 9)
Error Amplifier Transconductance (Note 9)
Error Amplifier Source and Sink Current
2
can be obtained with large copper lands, thermal glues or heatsinks.
LIM
BSOLUTE
SW
(Current Must Be Limited to 5mA When Status Pin
Switches “ON”) ................................................... 30V
LT1176C/LT1176C-5 .............................. 0 C to 70 C
LT1176C/LT1176C-5 ............................ 0 C to 125 C
Pin Voltage (Forced)...................................... 5.5V
Negative) (Note 6) ......................................... 20V
W
A
HARA TERISTICS
XI
W
U
C
W
CONDITIONS
I
V
V
V
V
Normal Mode
Startup Mode (Note 3)
I
R
R
V
V
8V V
1V V
Source (V
Sink (V
SW
I
LIM
SW
IN
IN
FB
SHDN
FB
SENSE
LIM
LIM
R
= 25V, V
= V
= 2.5V, V
= 0V Through 2k (Note 4) (LT1176)
= 0.2A
Open
= 1A
= 10k (Note 5)
= 7k (Note 5)
IN
A
IN
C
= 0.1V (Device Shutdown) (Note 8)
MAX
FB
= 0V (Note 4) (LT1176-5)
) ............. 35V
TI
FB
= 2.5V or V
4V
, V
V
U
SW
MAX
= 2V or V
IN
SW
G
= 0
(Note 7)
= 0 (Note 7)
35V
S
T
SENSE
J
SENSE
= 25 C, V
= 5.5V)
= 4V)
PACKAGE/ORDER I FOR ATIO
IN
FB/SENSE
= 25V, unless otherwise noted
FB/SENSE
GND
GND
GND
GND
I
V
LIM
NC
NC
NC
IN
GND
I
LIM
V
IN
10
T
T
1
2
3
4
5
6
7
8
9
JMAX
J MAX
20-LEAD PLASTIC SOL
1
2
3
4
8-LEAD PLASTIC DIP
= 125 C,
= 125 C,
N8 PACKAGE
S PACKAGE
TOP VIEW
TOP VIEW
JA
JA
= 90 C/ W*
= 50 C/ W*
8
7
6
5
20
19
18
17
16
15
14
13
12
11
100.0
3700
MIN
1.2
85
90
85
V
V
STATUS
SHUTDOWN
0.7
SW
C
V
NC
V
GND
GND
GND
GND
STATUS
SHUTDOWN
NC
SW
C
U
140.0
140.0
2000
5000
0.03
TYP
100
7.3
3.5
1.7
1.2
0.8
90
20
20
7.5
1.0
ORDER PART
LT1176CN8
LT1176CN8-5
ORDER PART
W
LT1176CS
LT1176CS-5
225.0
8000
MAX
NUMBER
NUMBER
150
250
300
110
120
1.1
1.4
8.0
4.8
2.2
0.1
10
1.6
UNITS
U
%/ V
mho
kHz
kHz
kHz
kHz
V/ V
mA
mA
%
V
V
A
A
A
V
V
A
A
A
A