LT3462 Ver la hoja de datos (PDF) - Linear Technology
Número de pieza
componentes Descripción
Fabricante
LT3462 Datasheet PDF : 8 Pages
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TYPICAL PERFOR A CE CHARACTERISTICS
LT3462/LT3462A
Oscillator Frequency (LT3462)
1.6
1.5
1.4
1.3
1.2
1.1
1.0
–40 –20
0 20 40 60
TEMPERATURE (°C)
80 100
3462 G01
Oscillator Frequency (LT3462A)
3.2
TA = 25°C
3.0
2.8
2.6
2.4
2.2
2.0
–40 –20
0 20 40 60
TEMPERATURE (°C)
80 100
3462 G04
Current Limit
480
TA = 25°C
360
LT3462
LT3462A
240
120
0
10 20 30 40 50 60 70 80 90
DUTY CYCLE (%)
3462 G02
FB Bias Current
0
–5
–10
–15
–20
–25
–30
–35
–40
–45
–50
–40 –20
0 20 40 60
TEMPERATURE (°C)
80 100
3462 G05
SDREF Minus FB Pin Voltage
1.29
1.28
1.27
1.26
1.25
1.24
1.23
–40 –20
0 20 40 60
TEMPERATURE (°C)
80 100
3462 G03
Quiescent Current in
Shutdown Mode
10
TA = 25°C
FB = N/C
8
6
4
2
0
0
4
8
12
16
SUPPLY VOLTAGE (V)
3462 G06
PI FU CTIO S
SW (Pin 1): Switch Pin. Connect to external inductor L1
and positive terminal of transfer cap.
GND (Pin 2): Ground. Tie directly to local ground plane.
FB (Pin 3): Feedback Pin. Connect resistive divider tap
here. Set R1 according to R1 = R2 • (VOUT/1.265V). In
shutdown, a proprietary shutdown bias current cancella-
tion circuit allows the internal 3µA source to pull up the
SDREF pin, even with residual negative voltage on VOUT.
SDREF (Pin 4): Dual Function Shutdown and 1.265V
Reference Output Pin. Pull to GND with external N-FET to
turn regulator off. Turn-off pull-down and a 2µA internal
source will pull SDREF up to turn-on the regulator. At turn-
on, a 180µA internal source pulls the pin to the regulation
voltage. The SDREF pin can supply up to 80µA at 1.265V
to bias the feedback resistor divider. An optional soft-start
circuit capacitor connects from this pin to –VOUT.
D (Pin 5): Anode Terminal of Integrated Schottky Diode.
Connect to negative terminal of transfer cap and external
inductor L2.
VIN (Pin 6): Input Supply Pin. Must be locally bypassed.
3462af
3
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