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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.
I LED (Pin 4): Input. I LED is the LED current sense pin. The
LED is connected between CPO (anode) and I LED (cathode).
The current into the I LED pin is set by a resistor connected
to the I SET pin and regulated internally.
I SET (Pin 5): LED Current Programming Resistor Pin. A
resistor connected between this pin and GND is used to
set the LED current level.
BLOCK DIAGRAM
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 ?oating.
V IN (Pin 7): Power. Supply voltage for the LTC3214. V IN
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.
OSCILLATOR
2
C1 +
–
10
C1 –
1
C2 +
8
C2 –
CPO
3
VOLTAGE
CLAMP
+
7
V IN
MODE
CONTROL
V REF
CURRENT
SOURCE
V IN
I LED
4
CONTROL
6
EN
CONTROL
LOGIC
58Ω
0.11Ω
250k
GND
I SET
GND
9
5
11
3214 BD
3214fb
5
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