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LT1777 Datasheet(PDF) 2 Page - Linear Technology

Part # LT1777
Description  Low Noise Step-Down Switching Regulator
PDF  24 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LT1777 Datasheet(HTML) 2 Page - Linear Technology

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LT1777
ABSOLUTE MAXIMUM RATINGS
PACKAGE/ORDER I FOR ATIO
(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
TOP VIEW
S PACKAGE
16-LEAD PLASTIC SO
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
GND*
NC
SHDN
VCC
VD
VSW
SGND
GND*
GND*
NC
VC
FB
SYNC
NC
VIN
GND*
TJMAX = 125°C, θJA = 50°C/W*
Consult factory for Military grade parts.
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.
ORDER PART
NUMBER
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Power Supplies
VIN(MIN)
Minimum Input Voltage
6.7
7.0
V
q
7.4
V
IVIN
VIN Supply Current
VC = 0V
620
800
µA
q
900
µA
IVCC
VCC Supply Current
VC = 0V
2.5
3.5
mA
q
4.5
mA
VVCC
VCC Dropout Voltage
(Note 2)
q
2.8
3.1
V
Shutdown Mode IVIN
VSHDN = 0V
30
50
µA
q
75
µA
Feedback Amplifier
VREF
Reference Voltage
1.225
1.240
1.255
V
q
1.215
1.265
V
IIN
FB Pin Input Bias Current
600
1500
nA
gm
Feedback Amplifier Transconductance
∆IC = ±10µA
400
650
1000
µmho
q
200
1500
µmho
ISRC, ISNK
Feedback Amplifier Source or Sink Current
60
100
170
µA
q
45
220
µA
VCL
Feedback Amplifier Clamp Voltage
2.0
V
Reference Voltage Line Regulation
12V
≤ VIN ≤ 48V
q
0.01
%/V
Voltage Gain
200
600
V/V
*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.
LT1777CS
LT1777IS



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