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LTC3214 Datasheet(PDF) 5 Page - Linear Technology |
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LTC3214 Datasheet(HTML) 5 Page - Linear Technology |
5 / 12 page LTC3214 5 3214fb 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. ILED (Pin 4): Input. ILED is the LED current sense pin. The LED is connected between CPO (anode) and ILED(cathode). 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 resistor pulls this pin to GND when left floating. VIN (Pin 7): Power. Supply voltage for the LTC3214. VIN should be bypassed with a 2.2μF 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. BLOCK DIAGRAM GND – + CONTROL LOGIC CPO ILED GND ISET VIN VIN EN C1+ C1– C2+ C2– 3214 BD CURRENT SOURCE CONTROL VREF VOLTAGE CLAMP 58Ω 0.11Ω 250k OSCILLATOR MODE CONTROL 2 10 1 8 3 4 11 5 9 6 7 |
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