LTC3210 datasheet(7/16 Pages) LINER

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LTC3210

3210fb

C1P, C2P, C1M, C2M (Pins 1, 16, 14, 13): Charge Pump

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

pacitor should be connected from C1P to C1M and C2P

to C2M.

CPO (Pin 2): Output of the Charge Pump Used to Power

All LEDs. This pin is enabled or disabled using the ENM

and ENC inputs. A 2.2µF X5R or X7R ceramic capacitor

should be connected to ground.

ENM, ENC (Pins 3, 10): Inputs. The ENM and ENC pins

are used to program the LED output currents. Each input

is strobed up to 7 times to decrement the internal 3-bit

DACs from full-scale to 1LSB. The counter will stop at

1 LSB if the strobing continues. The pin must be held

high after the final desired positive strobe edge. The data

is transferred after a 150µs (typ) delay. Holding the ENM

or ENC pin low will set the LED current to 0 and will reset

the counter after 150µs (typ). If both inputs are held low

for longer than 150µs (typ) the part will go into shutdown.

The charge pump mode is reset to 1x whenever ENC goes

low or when the part is in shutdown mode.

MLED1, MLED2, MLED3, MLED4 (Pins 4, 5, 6, 7):

Outputs. MLED1 to MLED4 are the MAIN current source

outputs. The LEDs are connected between CPO (anodes)

and MLED1-4 (cathodes). The current to each LED output

is set via the ENM input, and the programming resistor

connected between RM and GND. Each of the four LED

outputs can be disabled by connecting the output directly

to CPO. A 10µA current will flow through each directly

connected LED output.

RM, RC (Pins 8, 9): LED Current Programming Resistor

Pins. The RM and RC pins will servo to 1.2V. Resistors

connected between each of these pins and GND are used

to set the CLED and MLED current levels. Connecting

a resistor 12k or less will cause the LTC3210 to enter

overcurrent shutdown.

CLED (Pin 11): Output. CLED is the CAM current source

output. The LED is connected between CPO (anode) and

CLED (cathode). The current to the LED output is set via

the ENC input, and the programming resistor connected

between RC and GND.

GND (Pin 12): Ground. This pin should be connected to

a low impedance ground plane.

VBAT(Pin15):Supplyvoltage.Thispinshouldbebypassed

with a 2.2µF, or greater low ESR ceramic capacitor.

Exposed Pad (Pin 17): This pad should be connected

directly to a low impedance ground plane for optimal

thermal and electrical performance.

pin Functions

LTC3210 Datasheet(PDF) 7 Page - Linear Technology

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