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LT1977 Datasheet(PDF) 2 Page - Linear Technology

No. de Pieza. LT1977
Descripción  High Voltage 1.5A, 500kHz Step-Down Switching Regulator with 100uA Quiescent Current
Descarga  24 Pages
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Fabricante  LINER [Linear Technology]
Página de inicio  http://www.linear.com
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LT1977 Datasheet(HTML) 2 Page - Linear Technology

 
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LT1977
2
1977f
(Note 1)
VIN, SHDN, BIAS ..................................................... 60V
BOOST Pin Above SW ............................................ 35V
BOOST Pin Voltage ................................................. 68V
SYNC, CSS, PGFB, FB ................................................ 6V
Operating JunctionTemperature Range
LT1977EFE (Note 2) ........................ – 40°C to 125°C
LT1977IFE (Note 2) ......................... – 40°C to 125°C
Storage Temperature Range ................. – 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
ORDER PART
NUMBER
Consult LTC Marketing for parts specified with wider operating temperature ranges.
LT1977EFE
LT1977IFE
ABSOLUTE
AXI U
RATI GS
PACKAGE/ORDER I FOR ATIO
ELECTRICAL CHARACTERISTICS The denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TJ = 25°C. VIN = 12V, SHDN = 12V, BIAS = 5V, FB/PGFB = 1.25V, CSS/SYNC = 0V
unless otherwise noted.
TJMAX = 125°C, θJA = 45°C/W, θJC(PAD) = 10°C/W
EXPOSED PAD IS GND (PIN 17)
MUST BE SOLDERED TO GND (PIN 8)
FE PACKAGE
16-LEAD PLASTIC TSSOP
1
2
3
4
5
6
7
8
TOP VIEW
16
15
14
13
12
11
10
9
NC
SW
NC
VIN
NC
BOOST
CT
GND
PG
SHDN
SYNC
PGFB
FB
VC
BIAS
CSS
17
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
VSHDN
SHDN Threshold
1.15
1.3
1.45
V
ISHDN
SHDN Input Current
SHDN = 12V
520
µA
Minimum Input Voltage (Note 3)
2.4
3
V
IVINS
Supply Shutdown Current
SHDN = 0V, BOOST = 0V, FB/PGFB = 0V
0.1
2
µA
Supply Sleep Current (Note 4)
BIAS = 0V, FB = 1.35V
170
250
µA
FB = 1.35V
45
75
µA
IVIN
Supply Quiescent Current
BIAS = 0V, FB = 1.15V
4.10
mA
BIAS = 5V, FB = 1.15V
3.25
mA
Minimum BIAS Voltage (Note 5)
2.7
3
V
IBIASS
BIAS Sleep Current (Note 4)
110
180
µA
IBIAS
BIAS Quiescent Current
SYNC = 3.3V
700
900
µA
Minimum Boost Voltage (Note 6)
ISW = 1.5A
1.8
V
Input Boost Current (Note 7)
ISW = 1.5A
40
mA
VREF
Reference Voltage (VREF)
3.3V < VVIN < 60V
1.225
1.25
1.275
V
IFB
FB Input Bias Current
75
200
nA
EA Voltage Gain (Note 8)
900
V/V
EA Voltage gm
dI(VC)= ±10µA
450
650
900
µMho
EA Source Current
FB = 1.15V
20
40
55
µA
EA Sink Current
FB = 1.35V
15
30
40
µA
VC to SW gm
3A/V
VC High Clamp
2.1
2.2
2.4
V
IPK
SW Current Limit
1.5
2.4
3.5
A
FE PART
MARKING
1977EFE
1977IFE


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