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LT1956 Datasheet(PDF) 2 Page - Linear Technology

Part # LT1956
Description  High Voltage, 1.5A, 500kHz Step-Down
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LT1956 Datasheet(HTML) 2 Page - Linear Technology

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LT1956/LT1956-5
1956f
Input Voltage (VIN) ................................................. 60V
BOOST Pin Above SW ............................................ 35V
BOOST Pin Voltage ................................................. 68V
SYNC, SENSE Voltage (LT1956-5) ........................... 7V
SHDN Voltage ........................................................... 6V
BIAS Pin Voltage .................................................... 30V
FB Pin Voltage/Current (LT1956) ................... 3.5V/2mA
ORDER PART
NUMBER
LT1956EGN
LT1956IGN
LT1956EGN-5
LT1956IGN-5
GN PART MARKING
1956
1956I
19565
1956I5
TJMAX = 125°C, θJA = 85°C/ W, θJC (PIN 8) = 25°C/ W
FOUR CORNER PINS SOLDERED
TO GROUND PLANE
ABSOLUTE
AXI U
RATI GS
PACKAGE/ORDER I FOR ATIO
GN PACKAGE
16-LEAD PLASTIC SSOP
1
2
3
4
5
6
7
8
TOP VIEW
16
15
14
13
12
11
10
9
GND
SW
NC
VIN
NC
BOOST
NC
GND
GND
SHDN
SYNC
NC
FB/SENSE
VC
BIAS
GND
Operating Junction Temperature Range
LT1956EFE/LT1956EFE-5/LT1956EGN/LT1956EGN-5
(Notes 8, 10) ..................................... – 40
°C to 125°C
LT1956IFE/LT1956IFE-5/LT1956IGN/LT1956IGN-5
(Notes 8, 10) ..................................... – 40
°C to 125°C
Storage Temperature Range ................ – 65
°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300
°C
(Note 1)
ORDER PART
NUMBER
LT1956EFE
LT1956IFE
LT1956EFE-5
LT1956IFE-5
FE PART MARKING
TJMAX = 125°C, θJA = 45°C/ W, θJC (PAD) = 10°C/ W
EXPOSED BACKSIDE MUST BE SOLDERED
TO GROUND PLANE
FE PACKAGE
16-LEAD PLASTIC TSSOP
1
2
3
4
5
6
7
8
TOP VIEW
16
15
14
13
12
11
10
9
GND
SW
NC
VIN
NC
BOOST
NC
GND
GND
SHDN
SYNC
NC
FB/SENSE
VC
BIAS
GND
Consult LTC Marketing for parts specified with wider operating temperature ranges.
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Reference Voltage (LT1956)
5.5V
≤ VIN ≤ 60V
1.204
1.219
1.234
V
VOL + 0.2 ≤ VC ≤ VOH – 0.2
q
1.195
1.243
V
SENSE Voltage (LT1956-5)
5.5V
≤ VIN ≤ 60V
4.94
5
5.06
V
VOL + 0.2 ≤ VC ≤ VOH – 0.2
q
4.90
5.10
V
SENSE Pin Resistance (LT1956-5)
9.5
13.8
19
k
FB Input Bias Current (LT1956)
q
0.5
1.5
µA
Error Amp Voltage Gain
(Notes 2, 9)
200
400
V/V
Error Amp gm
dl (VC) = ±10µA (Note 9)
1500
2000
3000
µMho
q
1000
3200
µMho
VC to Switch gm
1.7
A/V
EA Source Current
FB = 1V or VSENSE = 4.1V
q
125
225
400
µA
EA Sink Current
FB = 1.4V or VSENSE = 5.7V
q
100
225
450
µA
VC Switching Threshold
Duty Cycle = 0
0.9
V
VC High Clamp
SHDN = 1V
2.1
V
The q denotes specifications which apply over the full operating temperature range, otherwise specifications are at TJ = 25°C.
VIN = 15V, VC = 1.5V, SHDN = 1V, Boost o/c, SW o/c, unless otherwise noted.
ELECTRICAL CHARACTERISTICS
1956EFE
1956IFE
1956EFE-5
1956IFE-5


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