LTC1261 - Switched Capacitor Regulated Voltage Inverter
Features
- Regulated Negative Voltage from a Single Positive Supply
- Can Provide Regulated -5V from a 3V Supply
- REG Pin Indicates Output is in Regulation
- Low Output Ripple: 5mV Typ
- Supply Current: 600µA Typ
- Shutdown Mode Drops Supply Current to 5µA
- Up to 15mA Output Current
- Adjustable or Fixed Output Voltages
- Requires Only Three or Four External Capacitors
- Available in SO-8 Packages
Typical Application
Description
The LTC1261 is a switched-capacitor voltage inverter designed to provide a regulated negative voltage from a single positive supply. The LTC1261CS operates from a single 3V to 8V supply and provides an adjustable output voltage from –1.25V to –8V. An on-chip resistor string allows the LTC1261CS to be configured for output voltages of –3.5V, –4V, –4.5V or –5V with no external components. The LTC1261CS8 is optimized for applications which use a 5V or higher supply or which require low output voltages. It requires a single external 0.1µF capacitor and provides adjustable and fixed output voltage options in 8-pin SO packages. The LTC1261CS requires one or two external 0.1µF capacitors, depending on input voltage. Both versions require additional external input and output bypass capacitors. An optional compensation capacitor at ADJ/COMP can be used to reduce the output voltage ripple. Each version of the LTC1261 will supply up to 12mA output current with guaranteed output regulation of 5%. The LTC1261 includes an open-drain REG output which pulls low when the output is within 5% of the set value. Output ripple is typically as low as 5mV. Quiescent current is typically 600µA when operating and 5µA in shutdown. The LTC1261 is available in a 14-pin narrow body SO package and an 8-pin SO package.Packaging
CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.
For complete and up to date package information and drawings, please refer to our packaging page
| Part Number | Package | Code | Temp | Package Drawing |
RoHS |
|---|---|---|---|---|---|
| LTC1261CS#PBF | SO-14 | S | C | 05-08-1610 (S14) | Yes |
| LTC1261CS#TRPBF | SO-14 | S | C | 05-08-1610 (S14) | Yes |
| LTC1261CS8-4.5#PBF | SO-8 | S8 | C | 05-08-1610 (S8) | Yes |
| LTC1261CS8-4.5#TRPBF | SO-8 | S8 | C | 05-08-1610 (S8) | Yes |
| LTC1261CS8-4#PBF | SO-8 | S8 | C | 05-08-1610 (S8) | Yes |
| LTC1261CS8-4#TRPBF | SO-8 | S8 | C | 05-08-1610 (S8) | Yes |
| LTC1261CS8#PBF | SO-8 | S8 | C | 05-08-1610 (S8) | Yes |
| LTC1261CS8#TRPBF | SO-8 | S8 | C | 05-08-1610 (S8) | Yes |
| LTC1261IS8#PBF | SO-8 | S8 | I | 05-08-1610 (S8) | Yes |
| LTC1261IS8#TRPBF | SO-8 | S8 | I | 05-08-1610 (S8) | Yes |
Order Info
- Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
- Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
- Please refer to our general ordering information or the product datasheet for more details
Package Variations and Pricing
| Part Number | Package | Temp | Price (1-99) |
Price (1k)* |
RoHS | |
|---|---|---|---|---|---|---|
| LTC1261CS#PBF | SO-14 | C | $3.00 | $2.50 | Yes | |
| LTC1261CS#TRPBF | SO-14 | C | $2.56 | Yes | ||
| LTC1261CS8-4.5#PBF | SO-8 | C | $2.10 | $1.75 | Yes | |
| LTC1261CS8-4.5#TRPBF | SO-8 | C | $1.81 | Yes | ||
| LTC1261CS8-4#PBF | SO-8 | C | $2.10 | $1.75 | Yes | |
| LTC1261CS8-4#TRPBF | SO-8 | C | $1.81 | Yes | ||
| LTC1261CS8#PBF | SO-8 | C | $2.10 | $1.75 | Yes | |
| LTC1261CS8#TRPBF | SO-8 | C | $1.81 | Yes | ||
| LTC1261IS8#PBF | SO-8 | I | $2.50 | $2.10 | Yes | |
| LTC1261IS8#TRPBF | SO-8 | I | $2.16 | Yes | ||
| Buy Now • Request Samples | ||||||
Demo Boards
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.Click here to view our complete list of demo boards
Applications
- GaAs FET Bias Generators
- Negative Supply Generators
- Battery-Powered Systems
- Single Supply Applications
People Who Viewed This Product Also Viewed
- LTC3260 - Low Noise Dual Supply Inverting Charge Pump
- LTC1983 - 100mA Regulated Charge-Pump Inverters in ThinSOT
- LT1054 - Switched-Capacitor Voltage Converter with Regulator
- LT3080 - Adjustable 1.1A Single Resistor Low Dropout Regulator
- LTC1261L - Switched Capacitor Regulated Voltage Inverter
- LT1763 - 500mA, Low Noise, LDO Micropower Regulators
- LT1964 - 200mA, Low Noise, Low Dropout Negative Micropower Regulator
- LTC1550 - Low Noise, Switched Capacitor-Regulated Voltage Inverters
- LT1761 - 100mA, Low Noise, LDO Micropower Regulators in TSOT-23
- LTC6655 - 0.25ppm Noise, Low Drift Precision References
Product Notifications
Please login to your MyLinear account for notifications of datasheet updates, new document releases and LTspice model announcements for your favorite products. If you do not have a MyLinear account you may Sign Up Now.
Forgot your password? Click here.
Need help? Email mylinear@linear.com with questions and comments.
Design Tools
LTspice
LTspice® software is a powerful, fast and free simulation tool, schematic capture and waveform viewer with enhancements and models for improving the simulation of switching regulators. Click here to download LTspice
Models for the following parts are available in LTspice:
LTC1261
LTC1261CS8
LTC1261CS8-4
LTC1261CS8-4.5
LTC1261LCS8
LTC1261LCS8-4
LTC1261LCS8-4.5
Technical Support
- For immediate technical assistance, contact your local sales office or distributor or call 1-800-4-LINEAR (US customers only) or 408-432-1900.
- For less urgent requests, please complete our Technical Support Request Form. Please allow 2-3 business days for reply.
