LT3460 데이터 시트보기 (PDF) - Linear Technology
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LT3460 Datasheet PDF : 12 Pages
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LT3460/LT3460-1
TYPICAL PERFORMANCE CHARACTERISTICS
Feedback Bias Current
30
25
20
15
10
5
0
–50 –25
0 25 50
TEMPERATURE (°C)
75 100
3460 G04
Switch Saturation Voltage
(VCESAT)
400
350
IC = 250mA (LT3460)
300
IC = 200mA (LT3460)
250
200
IC = 50mA (LT3460-1)
150
(LT3460)
100
IC = 100mA
50
0
–50 –25
0 25 50
TEMPERATURE (°C)
75 100
3460 G06
Feedback Voltage
1.260
1.255
1.250
1.245
1.240
–50 –25
0 25 50
TEMPERATURE (°C)
75 100
3460 G05
Current Limit vs Duty Cycle
450
400
350
LT3460
300
250
200
150
LT3460-1
100
50
0
0
0.2 0.4 0.6 0.8 1.0
DUTY CYCLE
3460 G07
PIN FUNCTIONS (ThinSOT/SC70/DFN Packages)
SW (Pin 1/Pin 1/Pin 3): Switch Pin. Connect inductor/diode
here. Minimize trace at this pin to reduce EMI.
GND (Pin 2/Pins 2 and 5/Exposed Pad Pin 7): Ground
Pin. Tie directly to local ground plane.
FB (Pin 3/Pin 3/Pin 1): Feedback Pin. Reference
voltage is 1.255V. Connect resistor divider tap here.
Minimize trace area at FB. Set VOUT according to
VOUT = 1.255V (1 + R1/R2).
SHDN (Pin 4/Pin 4/Pin 6): Shutdown Pin. Tie to 1.5V or
higher to enable device; 0.4V or less to disable device.
Also functions as soft-start. Use RC filter (47k, 47nF typ)
as shown in Figure 1.
VIN (Pin 5/Pin 6/Pin 4): Input Supply Pin. Must be locally
bypassed.
NC (NA/NA/Pins 2, 5): No-Connects. These pins are not
connected to internal circuitry. They should be tied to
ground to improve thermal and electrical performance.
3460fb
4
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