LT1617 Просмотр технического описания (PDF) - Linear Technology
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LT1617 Datasheet PDF : 8 Pages
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TYPICAL PERFOR A CE CHARACTERISTICS
Switch Saturation Voltage
(VCESAT)
0.60
0.55
0.50
0.45
ISWITCH = 500mA
0.40
0.35
0.30
ISWITCH = 300mA
0.25
0.20
0.15
0.10
–50 –25 0
25 50 75 100
TEMPERATURE (°C)
1617/-1 G01
Feedback Pin Voltage and
Bias Current
–1.25
5
–1.24
4
VOLTAGE
–1.23
3
–1.22
2
CURRENT
–1.21
1
–1.20
–50
–25 0 25 50
TEMPERATURE (°C)
0
75 100
1617/-1 G02
Switch Off Time
550
500
450
400
VIN = 1.2V
VIN = 12V
350
300
250
–50
–25 0 25 50
TEMPERATURE (°C)
75 100
1617/-1 G04
Switch Current Limit
400
VIN = 12V
350
300 LT1617
VIN = 1.2V
250
200
150
LT1617-1
100
50
VIN = 12V
VIN = 1.2V
0
–50
–25 0 25 50
TEMPERATURE (°C)
75 100
1617/-1 G05
LT1617/LT1617-1
Quiescent Current
25
VFB = 1.23V
NOT SWITCHING
23
21
VIN = 12V
19
VIN = 1.2V
17
15
–50
–25 0 25 50
TEMPERATURE (°C)
75 100
1617/-1 G03
Shutdown Pin Current
25
20
15
25°C
10
100°C
5
0
0
5
10
15
SHUTDOWN PIN VOLTAGE (V)
1617/-1 G06
PI FU CTIO S
SW (Pin 1): Switch Pin. This is the collector of the internal
NPN power switch. Minimize the metal trace area con-
nected to this pin to minimize EMI.
GND (Pin 2): Ground. Tie this pin directly to the local
ground plane.
NFB (Pin 3): Feedback Pin. Set the output voltage by
selecting values for R1 and R2 (see Figure 1):
VOUT − 1.23
R1 =
( ) 1.23 + 2 • 10−6
R2
SHDN (Pin 4): Shutdown Pin. Tie this pin to 0.9V or higher
to enable the device. Tie below 0.25V to turn off the device.
VIN (Pin 5): Input Supply Pin. Bypass this pin with a
capacitor as close to the device as possible.
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