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LTC3025EDC-2-TR Datasheet(PDF) 6 Page - Linear Technology |
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LTC3025EDC-2-TR Datasheet(HTML) 6 Page - Linear Technology |
6 / 12 page LTC3025-1/LTC3025-2/ LTC3025-3/LTC3025-4 6 30251234fc PIN FUNCTIONS BIAS (Pin 1): BIAS Input Voltage. BIAS provides internal power for LTC3025-X circuitry. The BIAS pin should be locally bypassed to ground if the LTC3025-X is more than a few inches away from another source of bulk capacitance. In general, the output impedance of a battery rises with frequency, so it is usually advisable to include an input bypass capacitor in battery-powered circuits. A capacitor in the range of 0.01μF to 0.1μF is usually sufficient. GND (Pin 2): Ground. Connect to a ground plane. IN (Pin 3): Input Supply Voltage. The output load current is supplied directly from IN. The IN pin should be locally bypassed to ground if the LTC3025-X is more than a few inches away from another source of bulk capacitance. In general, the output impedance of a battery rises with fre- quency, so it is usually advisable to include an input bypass capacitor when supplying IN from a battery. A capacitor in the range of 0.1μF to 1μF is usually sufficient. OUT (Pin 4): Regulated Output Voltage. The OUT pin supplies power to the load. A minimum ceramic output capacitor of at least 1μF is required to ensure stability. Larger output capacitors may be required for applications with large transient loads to limit peak voltage transients. See the Applications Information section for more informa- tion on output capacitance. ADJ (Pin 5) LTC3025-1: Adjust Input. This is the input to the error amplifier. The ADJ pin reference voltage is 0.4V referenced to ground. The output voltage range is 0.4V to 3.6V and is typically set by connecting ADJ to a resistor divider from OUT to GND. See Figure 2. SENSE (Pin 5) LTC3025-2, LTC3025-3, LTC3025-4: Out- put Sense. The sense is the input to the resistor divider driving the error amplifier. Optimum regulation will be obtained at the point where SENSE is connected to OUT. The SENSE pin bias current is 10μA at the nominal rated output voltage. SHDN (Pin 6): Shutdown Input, Active Low. This pin is used to put the LTC3025-X into shutdown. The SHDN pin current is typically less than 10nA. The SHDN pin cannot be left floating and must be tied to a valid logic level (such as BIAS) if not used. Exposed Pad (Pin 7): Ground and Heat Sink. Must be soldered to PCB ground plane or large pad for optimal thermal performance. TYPICAL PERFORMANCE CHARACTERISTICS Transient Response 250mA 10mA IOUT VOUT AC 10mV/DIV VIN = 1.5V VOUT = 1.2V VBIAS = 3.6V COUT = 1μF 100μs/DIV 30251234 G13 VIN to VOUT Dropout Voltage vs VIN (25°C) LTC3025-1 (TA = 25°C unless otherwise noted) VIN to VOUT Dropout Voltage vs VIN (90°C) LTC3025-1 VIN (V) 1 0 0.025 0.075 0.100 0.125 0.300 0.175 2 3 3.5 30251234 G14 0.050 0.200 0.225 0.250 0.725 0.150 1.5 2.5 4 4.5 VADJ = 0.385 IOUT = 500mA TA = 25°C BIAS = 2.7V BIAS = 3V BIAS = 3.3V BIAS = 3.8V BIAS = 5V VIN (V) 1 0 0.025 0.075 0.100 0.125 0.300 0.175 2 3 3.5 30251234 G15 0.050 0.200 0.225 0.250 0.725 0.150 1.5 2.5 4 4.5 VADJ = 0.385 IOUT = 500mA TA = 90°C BIAS = 2.7V BIAS = 3.8V BIAS = 5V BIAS = 3V BIAS = 3.3V |
Similar Part No. - LTC3025EDC-2-TR |
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Similar Description - LTC3025EDC-2-TR |
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