DocumentationDatasheet
Application Note
- AN42 - Voltage Reference Circuit Collection
- AN46 - Efficiency and Power Characteristics of Switching Regulator Circuits
- AN62 - Data Acquisition Circuit Collection
- AN70 - A Monolithic Switching Regulator with 100µV Output Noise
- AN75 - Circuitry for Signal Conditioning and Power Conversion
- AN90 - Current Sources for Fiber Optic Lasers: A Compendium of Pleasant Current Events
Design Note
- DN143 - Single IC, Power Factor Corrected, Off-Line Supply
- DN175 - Off-Line Low Noise Power Supply Does Not Require Filtering to Meet FCC Emission Requirements
- DN32 - A Simple Ultra-Low Dropout Regulator
- DN54 - A 4-Cell Ni-Cad Regulator/Charger for Notebook Computers
Reliability Data
LT Journal
Press Release
cad_symbol
ltspice
- LT1431 Demo Circuit - 5V Power Supply Monitor with ±500mV Window and 50mV Hysteresis
- LT3753/LT1431 Demo Circuit - 80W Active Clamp Non-Synchronous Forword Converter for PoE
- LT8310/LT1431 Demo Circuit - 72 Watt Isolated Nonsynchronous Forward Converter with Opto Feedback (36-72V to 12V @ 6A)
- LT8310/LT1431 Demo Circuit - 81 Watt Isolated Nonsynchronous Forward Converter with Opto Feedback (10.8-26.4V to 54V @ 1.5A)
- LT8310/LT1431 Demo Circuit - 92W Isolated Nonsynchronous Forward Converter with Opto Feedback (43-53V to 54V @ 1.7A)
- LTC3723-1/LT1431 Demo Circuit - 130W High Efficiency Isolated Non-Synchronous Push-Pull Converter (34-38V to 50V @ 2.6A)
Features
- Guaranteed 0.4% Initial Voltage Tolerance
- 0.1Ω Typical Dynamic Output Impedance
- Fast Turn-On
- Sink Current Capability, 1mA to 100mA
- Low Reference Pin Current
- Available in J8, N8, S8 or 3-Lead TO-92 Z Packages
Typical Application
Description
The LT1431 is an adjustable shunt voltage regulator with 100mA sink capability, 0.4% initial reference voltage tolerance and 0.3% typical temperature stability. On-chip divider resistors allow the LT1431 to be configured as a 5V shunt regulator, with 1% initial voltage tolerance and requiring no additional external components. By adding two external resistors, the output voltage may be set to any value between 2.5V and 36V. The nominal internal current limit of 100mA may be decreased by including one external resistor.
A simplified 3-pin version, the LT1431CZ/LT1431IZ, is available for applications as an adjustable reference and is pin compatible with the TL431.
N-8,SO-8,TO-92,CERDIP
Package Variations and Pricing
| Part Number | Package | Pins | Temp | Price (1-99) |
Price (1k)* |
|---|---|---|---|---|---|
| LT1431CN8#PBF | PDIP | 8 | C | $1.50 | $1.20 |
| LT1431CS8#PBF | SO | 8 | C | $2.08 | $1.75 |
| LT1431CS8#TRPBF | SO | 8 | C | $1.81 | |
| LT1431CZ#PBF | TO-92 | 3 | C | $1.35 | $1.05 |
| LT1431CZ#TRPBF | TO-92 | 3 | C | $1.11 | |
| LT1431IN8#PBF | PDIP | 8 | I | $1.92 | $1.55 |
| LT1431IS8#PBF | SO | 8 | I | $2.67 | $2.20 |
| LT1431IS8#TRPBF | SO | 8 | I | $2.26 | |
| LT1431IZ#PBF | TO-92 | 3 | I | $1.42 | $1.11 |
| LT1431IZ#TRPBF | TO-92 | 3 | I | $1.17 | |
| LT1431MPS8#PBF | SO | 8 | MP | $9.27 | $6.49 |
| LT1431MPS8#TR | SO | 8 | MP | $6.55 | |
| LT1431MPS8#TRPBF | SO | 8 | MP | $6.55 | |
| LT1431CN8 | PDIP | 8 | C | $3.00 | $2.40 |
| LT1431CS8 | SO | 8 | C | $4.16 | $3.50 |
| LT1431CS8#TR | SO | 8 | C | $3.62 | |
| LT1431CZ | TO-92 | 3 | C | $2.70 | $2.10 |
| LT1431CZ#TR | TO-92 | 3 | C | $2.22 | |
| LT1431IN8 | PDIP | 8 | I | $3.84 | $3.10 |
| LT1431IS8 | SO | 8 | I | $5.34 | $4.40 |
| LT1431IS8#TR | SO | 8 | I | $4.52 | |
| LT1431IZ | TO-92 | 3 | I | $2.84 | $2.22 |
| LT1431IZ#TR | TO-92 | 3 | I | $2.34 | |
| LT1431MJ8 | CERDIP | 8 | M | $44.98 | $32.50 |
| LT1431MJ8#PBF | CERDIP | 8 | M | $44.98 | $32.50 |
Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.
| Part Number | Description | Price | Documentation |
|---|---|---|---|
| DC259A | LT1339, LTC1693, LT1431 Isolated Demo Board | Telecom Module, 36 to 72Vin, 5V or 3.3Vout @ 10A | Contact Factory |