LT3462/LT3462A

3462af

3

TEMPERATURE (

°C)

1.29

1.28

1.27

1.26

1.25

1.24

1.23

3462 G03

DUTY CYCLE (%)

10

90

80

60

40

20

3462 G02

30

50

70

480

360

240

120

0

3462 G05

3462 G06

TEMPERATURE (

°C)

–40

1.6

1.5

1.4

1.3

1.2

1.1

1.0

20

60

3462 G01

–20

0

40

80

100

TEMPERATURE (

°C)

3462 G04

3.2

3.0

2.8

2.6

2.4

2.2

2.0

SUPPLY VOLTAGE (V)

0

16

48

12

10

8

6

4

2

0

FB = N/C

TEMPERATURE (

°C)

80

100

40

60

20

0

–40

–20

0

–5

–10

–15

–20

–25

–30

–35

–40

–45

–50

–40

20

60

–20

0

40

80

100

–40

20

60

–20

0

40

80

100

LT3462

LT3462A

TYPICAL PERFOR A CE CHARACTERISTICS

Oscillator Frequency (LT3462)

Current Limit

SDREF Minus FB Pin Voltage

Oscillator Frequency (LT3462A)

FB Bias Current

Quiescent Current in

Shutdown Mode

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

shutdown, a proprietary shutdown bias current cancella-

tion circuit allows the internal 3

µA source to pull up the

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 2

µA internal

source will pull SDREF up to turn-on the regulator. At turn-

on, a 180

µA internal source pulls the pin to the regulation

voltage. The SDREF pin can supply up to 80

µA at 1.265V

to bias the feedback resistor divider. An optional soft-start

D (Pin 5): Anode Terminal of Integrated Schottky Diode.

Connect to negative terminal of transfer cap and external

inductor L2.