Datasheet LTC3025 (Analog Devices) - 5
| Hersteller | Analog Devices |
| Beschreibung | 300mA Micropower VLDO Linear Regulator |
| Seiten / Seite | 12 / 5 — TYPICAL PERFORMANCE CHARACTERISTICS. 3MHz VIN Supply Rejection. Transient … |
| Dateiformat / Größe | PDF / 182 Kb |
| Dokumentensprache | Englisch |
TYPICAL PERFORMANCE CHARACTERISTICS. 3MHz VIN Supply Rejection. Transient Response. PIN FUNCTIONS. BIAS (Pin 1):. ADJ (Pin 5):
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LTC3025
TYPICAL PERFORMANCE CHARACTERISTICS 3MHz VIN Supply Rejection Transient Response
50 45 250mA C IOUT 40 OUT = 10μF 10mA 35 COUT = 1μF 30 25 VOUT 20 AC REJECTION (dB) 10mV/DIV 15 10 V 100μs/DIV 3025 G13 5 V IN = 1.5V BIAS = 3.6V IOUT = 100mA V V OUT = 1.2V OUT = 1.2V IOUT = 300mA 0 VBIAS = 3.6V 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 COUT = 1μF VIN (V) 3025 G12
PIN FUNCTIONS BIAS (Pin 1):
BIAS Input Voltage. BIAS provides internal capacitor of at least 1μF is required to ensure stability. power for LTC3025 circuitry. The BIAS pin should be lo- Larger output capacitors may be required for applications cally bypassed to ground if the LTC3025 is more than a with large transient loads to limit peak voltage transients. few inches away from another source of bulk capacitance. See the Applications Information section for more informa- In general, the output impedance of a battery rises with tion on output capacitance. frequency, so it is usually advisable to include an input
ADJ (Pin 5):
Adjust Input. This is the input to the error bypass capacitor in battery-powered circuits. A capacitor amplifi er. The ADJ pin reference voltage is 0.4V referenced in the range of 0.01μF to 0.1μF is usually suffi cient. to ground. The output voltage range is 0.4V to 3.6V and is
GND (Pin 2):
Ground. Connect to a ground plane. typically set by connecting ADJ to a resistor divider from OUT to GND. See Figure 2.
IN (Pin 3):
Input Supply Voltage. The output load current is supplied directly from IN. The IN pin should be locally
SHDN (Pin 6):
Shutdown Input, Active Low. This pin is bypassed to ground if the LTC3025 is more than a few inches used to put the LTC3025 into shutdown. The SHDN pin away from another source of bulk capacitance. In general, current is typically less than 10nA. The SHDN pin cannot the output impedance of a battery rises with frequency, so be left fl oating and must be tied to a valid logic level (such it is usually advisable to include an input bypass capacitor as BIAS) if not used. when supplying IN from a battery. A capacitor in the range
GND (Exposed Pad Pin 7):
Ground and Heat Sink. Must of 0.1μF to 1μF is usually suffi cient. be soldered to PCB ground plane or large pad for optimal
OUT (Pin 4):
Regulated Output Voltage. The OUT pin thermal performance. supplies power to the load. A minimum ceramic output 3025fd 5
TYPICAL PERFORMANCE CHARACTERISTICS 3MHz VIN Supply Rejection Transient Response
50 45 250mA C IOUT 40 OUT = 10μF 10mA 35 COUT = 1μF 30 25 VOUT 20 AC REJECTION (dB) 10mV/DIV 15 10 V 100μs/DIV 3025 G13 5 V IN = 1.5V BIAS = 3.6V IOUT = 100mA V V OUT = 1.2V OUT = 1.2V IOUT = 300mA 0 VBIAS = 3.6V 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 COUT = 1μF VIN (V) 3025 G12
PIN FUNCTIONS BIAS (Pin 1):
BIAS Input Voltage. BIAS provides internal capacitor of at least 1μF is required to ensure stability. power for LTC3025 circuitry. The BIAS pin should be lo- Larger output capacitors may be required for applications cally bypassed to ground if the LTC3025 is more than a with large transient loads to limit peak voltage transients. few inches away from another source of bulk capacitance. See the Applications Information section for more informa- In general, the output impedance of a battery rises with tion on output capacitance. frequency, so it is usually advisable to include an input
ADJ (Pin 5):
Adjust Input. This is the input to the error bypass capacitor in battery-powered circuits. A capacitor amplifi er. The ADJ pin reference voltage is 0.4V referenced in the range of 0.01μF to 0.1μF is usually suffi cient. to ground. The output voltage range is 0.4V to 3.6V and is
GND (Pin 2):
Ground. Connect to a ground plane. typically set by connecting ADJ to a resistor divider from OUT to GND. See Figure 2.
IN (Pin 3):
Input Supply Voltage. The output load current is supplied directly from IN. The IN pin should be locally
SHDN (Pin 6):
Shutdown Input, Active Low. This pin is bypassed to ground if the LTC3025 is more than a few inches used to put the LTC3025 into shutdown. The SHDN pin away from another source of bulk capacitance. In general, current is typically less than 10nA. The SHDN pin cannot the output impedance of a battery rises with frequency, so be left fl oating and must be tied to a valid logic level (such it is usually advisable to include an input bypass capacitor as BIAS) if not used. when supplying IN from a battery. A capacitor in the range
GND (Exposed Pad Pin 7):
Ground and Heat Sink. Must of 0.1μF to 1μF is usually suffi cient. be soldered to PCB ground plane or large pad for optimal
OUT (Pin 4):
Regulated Output Voltage. The OUT pin thermal performance. supplies power to the load. A minimum ceramic output 3025fd 5