LT1777C View Datasheet(PDF) - Linear Technology
Part Name
Description
MFG CO.
'LT1777C' PDF : 24 Pages View PDF
LT1777
ABSOLUTE MAXIMUM RATINGS
(Note 1)
Supply Voltage ....................................................... 48V
Switch Voltage (VIN – VSW) (Note 4) ...................... 51V
SHDN, SYNC Pin Voltage .......................................... 7V
VCC Pin Voltage ...................................................... 30V
FB Pin Voltage ........................................................ 3.0V
Operating Junction Temperature Range
LT1777C ............................................... 0°C to 125°C
LT1777I ........................................... – 40°C to 125°C
Storage Temperature Range ................ – 65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
PACKAGE/ORDER I FOR ATIO
GND* 1
NC 2
SHDN 3
VCC 4
VD 5
VSW 6
SGND 7
GND* 8
TOP VIEW
16 GND*
15 NC
14 VC
13 FB
12 SYNC
11 NC
10 VIN
9 GND*
S PACKAGE
16-LEAD PLASTIC SO
TJMAX = 125°C, θJA = 50°C/W*
Consult factory for Military grade parts.
ORDER PART
NUMBER
LT1777CS
LT1777IS
*FOUR CORNER PINS ARE
FUSED TO INTERNAL DIE
ATTACH PADDLE FOR HEAT
SINKING. CONNECT THESE
FOUR PINS TO EXPANDED PC
LANDS FOR PROPER HEAT
SINKING.
ELECTRICAL CHARACTERISTICS
The q denotes specifications which apply over the full operating temperature range, otherwise specifications are at TJ = 25°C.
VIN = 24V, 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
IVIN
VIN Supply Current
VC = 0V
620 800
q
900
IVCC
VCC Supply Current
VC = 0V
2.5
3.5
q
4.5
VVCC
VCC Dropout Voltage
Shutdown Mode IVIN
(Note 2)
VSHDN = 0V
q
2.8
3.1
30
50
q
75
Feedback Amplifier
VREF
Reference Voltage
1.225 1.240 1.255
q 1.215
1.265
IIN
FB Pin Input Bias Current
gm
Feedback Amplifier Transconductance
∆IC = ±10µA
400
q 200
600 1500
650 1000
1500
ISRC, ISNK Feedback Amplifier Source or Sink Current
60
q
45
100 170
220
VCL
Feedback Amplifier Clamp Voltage
Reference Voltage Line Regulation
Voltage Gain
12V ≤ VIN ≤ 48V
2.0
q
0.01
200 600
UNITS
V
V
µA
µA
mA
mA
V
µA
µA
V
V
nA
µmho
µmho
µA
µA
V
%/V
V/V
2
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