LT3494 datasheet(7/24 Pages) LINER

Part #	LT3494

Description	20mA LED Driver and OLED Driver with Integrated Schottky in 3mm x 2mm DFN

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Manufacturer	LINER [Linear Technology]

Direct Link	http://www.linear.com

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7 / 24 page

LT3498

7

3498f

BLOCK DIAGRAM

PIN FUNCTIONS

VOUT2 (Pin 7): Drain of Output Disconnect PMOS.

Place a bypass capacitor from this pin to GND. See the

Applications Information section.

CAP2 (Pin 8): Output of the OLED Driver. This pin is

connected to the cathode of the internal Schottky diode.

Place a bypass capacitor from this pin to GND.

SW2 (Pin 9): Switch Pin. This is the collector of the in-

ternal NPN power switch. Minimize the metal trace area

connected to this pin to minimize EMI.

VIN (Pin 10): Input Supply Pin. Must be locally by-

passed.

SW1 (Pin 11): Switch Pin. Connect the inductor of the

white LED driver at this pin. Minimize metal trace area at

this pin to minimize EMI.

CAP1 (Pin 12): Output of the White LED Driver. This pin is

connected to the cathode of the internal Schottky. Connect

the output capacitor to this pin and the sense resistor from

this pin to the LED1 pin.

Exposed Pad (Pin 13): Ground. The Exposed Pad must

be soldered to the PCB.

–

+

–

+

–

+

–

+

–

+

6

5

1

Σ

12

8

7

11

10

9

4

2

3

RAMP

GENERATOR

2.3MHz

OSCILLATOR

SWITCH

CONTROL

START-UP

CONTROL

A2

VREF

R

S

Q

OVERVOLTAGE

PROTECTION

DISCONNECT

CONTROL

SHUNT

CONTROL

3498 BD

DRIVER

COMPARATOR

SW2

CAP1

LED1

VIN

RSENSE1

10

Ω

VOUT2

CAP2

RC

CC

C1

1

µF

C2

0.47

µF

RFB2

2.21M

Ω

Q2

A5

A1

A4

A3

C3

10

µF

L2

10

µF

SW1

GND2

FB2

CTRL2

CTRL1 GND1

R

Q1

182k

Ω

CIN

4.7

µF

L1

15

µF

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