LTC3214

5

3214fb

PIN FUNCTIONS

Flying Capacitor Pins. A 2.2μF X5R or X7R ceramic ca-

CPO (Pin 3): Output. CPO is the output of the charge

pump. This pin may be enabled or disabled using the EN

input. A 4.7μF X5R or X7R ceramic capacitor is required

from CPO to GND.

resistor connected between this pin and GND is used to

set the LED current level.

EN (Pin 6): Input. The EN pin is used to enable the part

and bring it into shutdown mode. An internal 250k resistor

pulls this pin to GND when left floating.

should be bypassed with a 2.2μF to 4.7μF low impedance

ceramic capacitor to GND.

GND (Pin 9): Charge Pump Ground. This pin should be

connected directly to a low impedance ground plane.

Exposed Pad (Pin 11): Control Signal Ground. This pad

must be soldered to a low impedance ground plane for

optimum thermal and electrical performance.

BLOCK DIAGRAM

GND

–

+

CONTROL

LOGIC

CPO

GND

EN

3214 BD

CURRENT

SOURCE

CONTROL

VOLTAGE

CLAMP

58Ω

0.11Ω

250k

OSCILLATOR

MODE

CONTROL

2

10

1

8

3

4

11

5

9

6

7