LTC3215 datasheet(5/12 Pages) LINER

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LTC3215

3215f

PI FU CTIO S

BLOCK DIAGRA

–

1X MODE: CPO = VIN

1.5X MODE: CPO = 4.6V

2X MODE: CPO = 5.1V

VREF

DROPOUT

DETECTOR

CONTROL

LOGIC

MODE

CONTROL

OSCILLATOR

GND

CPO

ILED

GND

ISET

VIN

C1+

C1–

C2+

C2–

3215 BD

CURRENT

SOURCE

CONTROL

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

Flying Capacitor Pins. A 2.2µF 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 4.7µF X5R or X7R ceramic capacitor is required

from CPO to GND.

ILED (Pin 4): Output. ILED is the LED current source output.

The LED is connected between CPO (anode) and ILED

(cathode). The current into the ILED pin is set by the

programming resistor connected from ISET to GND.

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

ISET pin will servo to 1.22V. A resistor connected between

this pin and GND is used to set the LED current level.

Connecting a resistor of 2k or less will cause the LTC3215

to enter overcurrent shutdown mode.

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

it into shutdown mode.

VIN (Pin 7): Power. Supply voltage for the LTC3215. VIN

should be bypassed with a 2.2µF or greater 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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