LTC3214 datasheet(5/12 Pages) LINER

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LTC3214

3214fa

PI FU CTIO S

BLOCK DIAGRA

GND

–

CONTROL

LOGIC

CPO

ILED

GND

ISET

VIN

C1+

C1–

C2+

C2–

3214 BD

CURRENT

SOURCE

CONTROL

VREF

VOLTAGE

CLAMP

Ω

0.11

Ω

250k

OSCILLATOR

MODE

CONTROL

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

Capacitor Pins. A 2.2

µF X5R or X7R ceramic capacitor

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 4.7

µF 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 (cath-

ode). 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

Ω resistor

pulls this pin to GND when left floating.

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

should be bypassed with a 2.2

µF 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.

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