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LTC3225-1 Datasheet(PDF) 5 Page - Linear Technology |
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LTC3225-1 Datasheet(HTML) 5 Page - Linear Technology |
5 / 14 page LTC3225/LTC3225-1 5 3225fb PIN FUNCTIONS C+ (Pin 1): Flying Capacitor Positive Terminal. A 1μF X5R or X7R ceramic capacitor should be connected from C+ to C–. C– (Pin 2): Flying Capacitor Negative Terminal. CX (Pin 3): Midpoint of Two Series Supercapacitors. This pin voltage is monitored and forced to track COUT (CX = COUT/2) during charging to achieve voltage balancing of the top and bottom supercapacitors. SHDN(Pin4):ActiveLowShutdownInput.AlowonSHDN puts the LTC3225/LTC3225-1 in low current shutdown mode. Do not float the SHDN pin. PGOOD (Pin 5): Open-Drain Output Status Indicator. Upon start-up, this open-drain pin remains low until the output voltage, VOUT, is within 6% (typical) of its final value. Once VOUT is valid, PGOOD becomes Hi-Z. If VOUT falls 7.2% (typical) below its correct regulation level, PGOOD is pulled low. PGOOD may be pulled up through an external resistor to an appropriate reference level. This pin is Hi-Z in shutdown mode. VSEL (Pin 6): Output Voltage Selection Input. A logic low at VSEL sets the regulated COUT to 4.8V (LTC3225) or 4V (LTC3225-1); a logic high sets the regulated COUT to 5.3V (LTC3225) or 4.5V (LTC3225-1). Do not float the VSEL pin. PROG (Pin 7): Charge Current Programming Pin. A resis- tor connected between this pin and GND sets the charge current. (See Applications Information section). GND (Pin 8, Exposed Pad Pin 11): Charge Pump Ground. These pins must be soldered directly to PCB ground. The exposed pad must be soldered to a low impedance PCB ground for rated thermal performance. VIN (Pin 9): Power Supply for the LTC3225/LTC3225-1. VIN should be bypassed to GND with a low ESR ceramic capacitor of more than 2.2μF. COUT (Pin 10): Charge Pump Output Pin. Connect COUT to the top plate of the top supercapacitor. COUTprovidescharge current to the supercapacitors and regulates the final volt- age to 4.8V/5.3V (LTC3225) or 4V/4.5V (LTC3225-1). Charging Profile with Unequal Initial Output Capacitor Voltage (Initial VTOP = 1V, VBOT = 1.3V) SHDN 5V/DIV VCOUT 2V/DIV VTOP-VBOT 500mV/DIV IVIN 300mA/DIV 2 SEC/DIV 3225 G10 LTC3225 VSEL = VIN RPROG = 12k CTOP = CBOT = 1.1F CTOP INITIAL VOLTAGE = 1V CBOT INITIAL VOLTAGE = 1.3V SHDN 5V/DIV VCOUT 2V/DIV VTOP-VBOT 200mV/DIV IVIN 300mA/DIV 5 SEC/DIV 3225 G11 LTC3225 VSEL = VIN RPROG = 12k CTOP = 1.43F CBOT = 1.1F CTOP INITIAL VOLTAGE = 0V CBOT INITIAL VOLTAGE = 0V SHDN 5V/DIV VCOUT 2V/DIV VTOP-VBOT 200mV/DIV IVIN 300mA/DIV 5 SEC/DIV 3225 G12 LTC3225 VSEL = VIN RPROG = 12k CTOP = 1.1F CBOT = 1.43F CTOP INITIAL VOLTAGE = 0V CBOT INITIAL VOLTAGE = 0V Charging Profile with 30% Mismatch in Output Capacitance (CTOP > CBOT) Charging Profile with 30% Mismatch in Output Capacitance (CTOP < CBOT) TYPICAL PERFORMANCE CHARACTERISTICS (TA = 25°C, CFLY = 1μF, CIN = 2.2μF, CTOP = CBOT, unless otherwise specified) |
Similar Part No. - LTC3225-1 |
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Similar Description - LTC3225-1 |
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