Datasheet LTC3025-1, LTC3025-2, LTC3025-3, LTC3025-4 (Analog Devices) - 7
| Manufacturer | Analog Devices |
| Description | 500mA Micropower VLDO Linear Regulators |
| Pages / Page | 14 / 7 — pin FuncTions BIAS (Pin 1):. ADJ (Pin 5) LTC3025-1:. SENSE (Pin 5) … |
| File Format / Size | PDF / 256 Kb |
| Document Language | English |
pin FuncTions BIAS (Pin 1):. ADJ (Pin 5) LTC3025-1:. SENSE (Pin 5) LTC3025-2, LTC3025-3, LTC3025-4:. GND (Pin 2):. IN (Pin 3):
Model Line for this Datasheet
- LTC3025EDC-1#PBF LTC3025EDC-1#TRMPBF LTC3025EDC-1#TRMPBF LTC3025EDC-1#TRPBF LTC3025EDC-1#TRPBF LTC3025EDC-2#TRMPBF LTC3025EDC-2#TRPBF LTC3025EDC-3#TRMPBF LTC3025EDC-3#TRPBF LTC3025EDC-4#TRMPBF LTC3025EDC-4#TRPBF LTC3025IDC-1#PBF LTC3025IDC-1#TRMPBF LTC3025IDC-1#TRMPBF LTC3025IDC-1#TRPBF LTC3025IDC-1#TRPBF LTC3025IDC-2#TRMPBF LTC3025IDC-2#TRPBF LTC3025IDC-3#TRMPBF LTC3025IDC-3#TRPBF LTC3025IDC-4#TRMPBF LTC3025IDC-4#TRPBF
- LTC3025EDC-2#PBF LTC3025EDC-2#TRMPBF LTC3025EDC-2#TRPBF LTC3025IDC-2#PBF LTC3025IDC-2#TRMPBF LTC3025IDC-2#TRPBF
Text Version of Document
LTC3025-1/LTC3025-2/ LTC3025-3/LTC3025-4
pin FuncTions BIAS (Pin 1):
BIAS Input Voltage. BIAS provides internal See the Applications Information section for more informa- power for LTC3025-X circuitry. The BIAS pin should be tion on output capacitance. locally bypassed to ground if the LTC3025-X is more than a
ADJ (Pin 5) LTC3025-1:
Adjust Input. This is the input to few inches away from another source of bulk capacitance. the error amplifier. The ADJ pin reference voltage is 0.4V In general, the output impedance of a battery rises with referenced to ground. The output voltage range is 0.4V to frequency, so it is usually advisable to include an input 3.6V and is typically set by connecting ADJ to a resistor bypass capacitor in battery-powered circuits. A capacitor divider from OUT to GND. See Figure 2. in the range of 0.01µF to 0.1µF is usually sufficient.
SENSE (Pin 5) LTC3025-2, LTC3025-3, LTC3025-4:
Output
GND (Pin 2):
Ground. Connect to a ground plane. Sense. The sense is the input to the resistor divider driving
IN (Pin 3):
Input Supply Voltage. The output load current the error amplifier. Optimum regulation will be obtained at is supplied directly from IN. The IN pin should be locally the point where SENSE is connected to OUT. The SENSE pin bypassed to ground if the LTC3025-X is more than a few bias current is 10µA at the nominal rated output voltage. inches away from another source of bulk capacitance.
SHDN (Pin 6):
Shutdown Input, Active Low. This pin is In general, the output impedance of a battery rises with used to put the LTC3025-X into shutdown. The SHDN pin frequency, so it is usually advisable to include an input current is typically less than 10nA. The SHDN pin cannot bypass capacitor when supplying IN from a battery. A be left floating and must be tied to a valid logic level (such capacitor in the range of 0.1µF to 1µF is usually sufficient. as BIAS) if not used.
OUT (Pin 4):
Regulated Output Voltage. The OUT pin
GND (Exposed Pad Pin 7):
Ground and Heat Sink. Must supplies power to the load. A minimum ceramic output be soldered to PCB ground plane or large pad for optimal capacitor of at least 1µF is required to ensure stability. thermal performance. Larger output capacitors may be required for applications with large transient loads to limit peak voltage transients.
block DiagraM
LTC3025-1 LTC3025-2, LTC3025-3, LTC3025-4 BIAS BIAS 1 1 REFERENCE SOFT-START IN REFERENCE SOFT-START IN SHDN 3 SHDN 3 6 SHDN 0.4V + 6 SHDN 0.4V + – – 6µA 6µA OUT OUT GND 4 GND 4 2 2 ADJ SENSE 5 5 R1 R2 40k 80k (LTC3025-2) 110k (LTC3025-3) 140k (LTC3025-4) 30251234 BD 30251234ff 7 Document Outline Features Description Applications Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Applications Information Package Description Revision History Typical Application Related Parts
pin FuncTions BIAS (Pin 1):
BIAS Input Voltage. BIAS provides internal See the Applications Information section for more informa- power for LTC3025-X circuitry. The BIAS pin should be tion on output capacitance. locally bypassed to ground if the LTC3025-X is more than a
ADJ (Pin 5) LTC3025-1:
Adjust Input. This is the input to few inches away from another source of bulk capacitance. the error amplifier. The ADJ pin reference voltage is 0.4V In general, the output impedance of a battery rises with referenced to ground. The output voltage range is 0.4V to frequency, so it is usually advisable to include an input 3.6V and is typically set by connecting ADJ to a resistor bypass capacitor in battery-powered circuits. A capacitor divider from OUT to GND. See Figure 2. in the range of 0.01µF to 0.1µF is usually sufficient.
SENSE (Pin 5) LTC3025-2, LTC3025-3, LTC3025-4:
Output
GND (Pin 2):
Ground. Connect to a ground plane. Sense. The sense is the input to the resistor divider driving
IN (Pin 3):
Input Supply Voltage. The output load current the error amplifier. Optimum regulation will be obtained at is supplied directly from IN. The IN pin should be locally the point where SENSE is connected to OUT. The SENSE pin bypassed to ground if the LTC3025-X is more than a few bias current is 10µA at the nominal rated output voltage. inches away from another source of bulk capacitance.
SHDN (Pin 6):
Shutdown Input, Active Low. This pin is In general, the output impedance of a battery rises with used to put the LTC3025-X into shutdown. The SHDN pin frequency, so it is usually advisable to include an input current is typically less than 10nA. The SHDN pin cannot bypass capacitor when supplying IN from a battery. A be left floating and must be tied to a valid logic level (such capacitor in the range of 0.1µF to 1µF is usually sufficient. as BIAS) if not used.
OUT (Pin 4):
Regulated Output Voltage. The OUT pin
GND (Exposed Pad Pin 7):
Ground and Heat Sink. Must supplies power to the load. A minimum ceramic output be soldered to PCB ground plane or large pad for optimal capacitor of at least 1µF is required to ensure stability. thermal performance. Larger output capacitors may be required for applications with large transient loads to limit peak voltage transients.
block DiagraM
LTC3025-1 LTC3025-2, LTC3025-3, LTC3025-4 BIAS BIAS 1 1 REFERENCE SOFT-START IN REFERENCE SOFT-START IN SHDN 3 SHDN 3 6 SHDN 0.4V + 6 SHDN 0.4V + – – 6µA 6µA OUT OUT GND 4 GND 4 2 2 ADJ SENSE 5 5 R1 R2 40k 80k (LTC3025-2) 110k (LTC3025-3) 140k (LTC3025-4) 30251234 BD 30251234ff 7 Document Outline Features Description Applications Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Applications Information Package Description Revision History Typical Application Related Parts
