Connection Diagram

Top View

20065302

8-bump micro SMD

Ordering Information

Order Number

Package Type

NSC Package Drawing

Top Mark

Supplied As

LM3501TL-16

micro SMD

TL08SSA

19

250 Units, Tape and Reel

LM3501TLX-16

micro SMD

TL08SSA

19

3000 Units, Tape and Reel

LM3501TL-21

micro SMD

TL08SSA

30

250 Units, Tape and Reel

LM3501TLX-21

micro SMD

TL08SSA

30

3000 Units, Tape and Reel

Pin Description/Functions

Pin

Name

Function

A1

AGND

Analog ground.

B1

V

IN

Analog and Power supply input.

C1

V

OUT

PMOS source connection for synchronous rectification.

C2

V

SW

Switch pin. Drain connections of both NMOS and PMOS power devices.

C3

GND

Power Ground.

B3

FB

Output voltage feedback connection.

A3

CNTRL

Analog LED current control.

A2

SHDN

Shutdown control pin.

AGND (pin A1): Analog ground pin. The analog ground pin

should tie directly to the GND pin.

V

with a capacitor, as close to the device as possible, con-

nected between the V

V

device. Connect the output capacitor between the V

GND pins as close as possible to the device.

V

switch devices. Keep the inductor connection close to this

pin to minimize EMI radiation.

GND (pin C3):Power ground pin. Tie directly to ground

plane.

FB (pin B3):Output voltage feedback connection. Set the

primary White LED network current with a resistor from the

FB pin to GND. Keep the current setting resistor close to the

device and connected between the FB and GND pins.

CNTRL (pin A3): Analog control of LED current. A voltage

above 125 mV will begin to regulate the LED current. De-

creasing the voltage below 75 mV will turn off the LEDs.

SHDN (pin A2):Shutdown control pin. Disable the device

with a voltage less than 0.3V and enable the device with a

voltage greater than 1.1V. The white LED current can be

controlled using a PWM signal at this pin. There is an

internal pull down on the SHDN pin, the device is in a

normally off state.

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