LTC3216 datasheet(5/12 Pages) LINER

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LTC3216

3216fc

2x Mode CPO Output Ripple

Charge Pump Mode Switching

and Input Current

TYPICAL PERFORMANCE CHARACTERISTICS

PIN FUNCTIONS

C2+, C1+, C2–, C1– (Pins 1, 2, 10, 12): 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 EN1

and EN2 inputs. A 4.7μF X5R or X7R ceramic capacitor is

required from CPO to GND.

ISET1/ISET2 (Pins 4, 6): LED Current Programming Resistor

Pins. The ISET1 and ISET2 pins will servo to 1.22V. Resistors

connected between each of these pins and GND are used

to set the high and low LED current levels. Connecting

a resistor of 2k or less will cause the LTC3216 to enter

overcurrent shutdown mode.

ILED (Pin 5): 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 via the EN1

and EN2 inputs, and the programming resistors connected

from ISET2 and ISET1 to GND.

EN1/EN2 (Pins 7, 8): Inputs. The EN1 and EN2 pins are

used to select which current level is being supplied to the

LED, as well as to put the part into shutdown mode. The

truth table for these pins is as follows:

Truth Table

EN1

EN2

MODE

Shutdown

Low Current

High Current

Low + High Current

VIN (Pin 9): Power. Supply voltage for the LTC3216. VIN

should be bypassed with a 2.2μF or greater low impedance

ceramic capacitor to GND.

GND (Pin 11): Charge Pump Ground. This pin should be

connected directly to a low impedance ground plane.

Exposed Pad (Pin 13): Control Signal Ground. This pad

must be soldered to a low impedance ground plane for

optimum thermal and electrical performance.

(TA = 25°C unless otherwise speciﬁed)

3216 G12

VCPO

20mV/DIV

A/C COUPLED

500ns/DIV

VIN = 3.6V

ICPO = 400mA

1ms/DIV

EN2

5V/DIV

IVIN

500mA/DIV

VCPO

1V/DIV

3216 G13

VIN = 3V

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