LT3463A Ver la hoja de datos (PDF) - Linear Technology
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LT3463A Datasheet PDF : 8 Pages
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TYPICAL PERFOR A CE CHARACTERISTICS
VCESAT and VDIODE Voltage
900
FOR BOTH SWITCHERS
800
700 IDIODE = 150mA
600
500
400
300
200
100 ISWITCH = 150mA
0
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
3463 G01
Switch Off Time
400
350
300
250
200
150
100
50
0
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
3463 G04
VREF and VFB1 Voltage
1.27
1.26
1.25
VREF
VFB1
1.24
1.23
1.22
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
3463 G02
Switch Current Limit
450
400
LT3463A SW2
350
300
250
LT3463 SW1, SW2
200
LT3463A SW1
150
100
50
0
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
3463 G05
LT3463/LT3463A
VFB2 Voltage
10
8
6
4
2
0
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
3463 G03
Quiescent Current
60
50
40
30
20
10 NOT SWITCHING
VFB1 = 1.3V
VFB2 = –0.1V
0
–50 –25 0 25 50 75
TEMPERATURE (°C)
100 125
3463 G06
PI FU CTIO S
VOUT1 (Pin 1): Output Voltage Switcher 1. This is the
cathode of an internal Schottky diode whose anode is
connected to the SW1 pin.
SW1 (Pin 2): Switch Pin for Switcher 1. This is the
collector of the internal NPN switch. Minimize the metal
trace area connected to this pin to minimize EMI.
VIN (Pin 3): Input Supply Pin. Bypass this pin with a
capacitor as close to the device as possible.
SW2 (Pin 4): Switch Pin for Switcher 2. This is the
collector of the internal NPN switch. Minimize the metal
trace area connected to this pin to minimize EMI.
D2 (Pin 5): Diode for Switcher 2. This is the anode of an
internal Schottky diode whose cathode connected to the
GND pin.
FB2 (Pin 6): Feedback Pin for Switcher 2. Set the output
voltage by selecting values for R3 and R4.
VREF (Pin 7): Voltage Reference Pin (1.25V). This pin is
used along with FB2 to set the negative output voltage for
Switcher 2.
SHDN2 (Pin 8): Shutdown Pin for Switcher 2. Pull this pin
above 1.5V to enable Switcher 2. Pull below 0.3V to turn
it off. Do not leave this pin floating.
3463f
3
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