LT1776I View Datasheet(PDF) - Linear Technology
Part Name
Description
Manufacturer
LT1776I Datasheet PDF : 20 Pages
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LT1776
ABSOLUTE MAXIMUM RATINGS
(Note 1)
Supply Voltage (Note 5) .......................................... 60V
Switch Voltage (Note 5) ........................................... 60V
SHDN, SYNC Pin Voltage ........................................... 7V
VCC Pin Voltage ....................................................... 30V
FB Pin Voltage ........................................................... 3V
Operating Junction Temperature Range
LT1776C ................................................ 0°C to 125°C
LT1776I ............................................ – 40°C to 125°C
Storage Temperature Range ................. – 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
PACKAGE/ORDER INFORMATION
TOP VIEW
SHDN 1
VCC 2
VSW 3
GND 4
8 VC
7 FB
6 SYNC
5 VIN
N8 PACKAGE
8-LEAD PDIP
S8 PACKAGE
8-LEAD PLASTIC SO
TJMAX = 125°C, θJA = 130°C/ W (N8)
TJMAX = 125°C, θJA = 110°C/ W (S8)
Consult factory for Military grade parts.
ORDER PART
NUMBER
LT1776CN8
LT1776CS8
LT1776IN8
LT1776IS8
S8 PART MARKING
1776
1776I
ELECTRICAL CHARACTERISTICS
The q denotes specifications which apply over the full operating temperature range, otherwise specifications are TA = 25°C.
VIN = 40V, VSW open, VCC = 5V, VC = 1.4V unless otherwise noted.
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX
Power Supplies
VIN(MIN)
Minimum Input Voltage
6.7
7.0
q
7.4
Thermally Limited Continuous Operating Voltage
IVIN
VIN Supply Current
VC = 0V
q
40
620 800
q
900
IVCC
VCC Supply Current
VVCC
VCC Dropout Voltage
Shutdown Mode IVIN
Feedback Amplifier
VC = 0V
(Note 2)
VSHDN = 0V
3.2
4.0
q
5.0
2.8
3.1
30
50
q
75
VREF
Reference Voltage
1.225 1.240 1.255
q 1.215
1.265
IIN
FB Pin Input Bias Current
gm
Feedback Amplifier Transconductance
∆lc = ±10µA
400
q 200
600 1500
650 1000
1500
ISRC, ISNK Feedback Amplifier Source or Sink Current
VCL
Feedback Amplifier Clamp Voltage
Reference Voltage Line Regulation
Voltage Gain
Output Switch
12V ≤ VIN ≤ 60V
60
q 45
100 170
220
2.0
q
0.01
200 600
VON
Output Switch On Voltage
ILIM
Switch Current Limit
Current Amplifier
Control Pin Threshold
ISW = 0.5A
(Note 3)
Duty Cycle = 0%
1.0
1.5
q 0.55 0.70
1.0
0.9
1.1
1.25
Control Voltage to Switch Transconductance
2
UNITS
V
V
V
µA
µA
mA
mA
V
µA
µA
V
V
nA
µmho
µmho
µA
µA
V
%/V
V/V
V
A
V
A/V
2
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