LTC3214EDD 데이터 시트보기 (PDF) - Linear Technology

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LTC3214EDD

500mA Camera LED Charge Pump

Linear Technology 

LTC3214

PIN FUNCTIONS

C2+, C1+, C2–, C1– (Pins 1, 2, 8, 10): Charge Pump

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

pacitor should be connected from C1+ to C1– and from

C2+ to C2–.

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.

ILED (Pin 4): Input. ILED is the LED current sense pin. The

LED is connected between CPO (anode) and ILED (cathode).

The current into the ILED pin is set by a resistor connected

to the ISET pin and regulated internally.

ISET (Pin 5): LED Current Programming Resistor Pin. A

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.

VIN (Pin 7): Power. Supply voltage for the LTC3214. VIN

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

2

C1+

10

C1–

1

C2+

8

C2–

OSCILLATOR

VIN

7

EN

6

CONTROL

LOGIC

250k

GND

9

CPO

3

VOLTAGE

CLAMP

MODE

CONTROL

VREF

CURRENT

SOURCE

CONTROL

VIN

ILED 4

58Ω

0.11Ω

ISET

5

GND

11

3214 BD

3214fb

5

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