LTC1751 - Micropower, Regulated Charge Pump DC/DC Converters
Features
- 5V Output Current:
100mA (VIN >/= 3V) - 3.3V Output Current:
80mA (VIN >/= 2.5V) - Ultralow Power: 20µA Quiescent Current
- Regulated Output Voltage: 3.3V ±4%, 5V ±4%, ADJ
- VIN Range: 2V to 5.5V
- 800kHz Switching Frequency
- No Inductors
- Very Low Shutdown Current: <2µA
- Shutdown Disconnects Load from VIN
- PowerGood/Undervoltage Output
- Adjustable Soft-Start Time
- Short-Circuit/Thermal Protection
- Available in 8-Pin MSOP
Typical Application
Description
The LTC1751 family are micropower charge pump DC/DC converters that produce a regulated output voltage at up to 100mA. The input voltage range is 2V to 5.5V. Extremely low operating current (20µA typical with no load) and low external parts count (one flying capacitor and two small bypass capacitors at VIN and VOUT) make them ideally suited for small, battery-powered applications.The LTC1751 family operate as Burst Mode™ switched capacitor voltage doublers to achieve ultralow quiescent current. They have thermal shutdown capability and can survive a continuous short circuit from Vout to GND. The PGOOD pin on the LTC1751-3.3 and LTC1751-5 indicates when the output voltage has reached its final value and if the output has an undervoltage fault condition. The FB pin of the adjustable LTC1751 can be used to program the desired output voltage or current. An optional soft-start capacitor may be used at the SS pin to prevent excessive inrush current during start-up.
The LTC1751 family is available in an 8-pin MSOP 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 |
|---|---|---|---|---|---|
| LTC1751EMS8-3.3#PBF | MS-8 | MS8 | E | 05-08-1660 | Yes |
| LTC1751EMS8-3.3#TRPBF | MS-8 | MS8 | E | 05-08-1660 | Yes |
| LTC1751EMS8-5#PBF | MS-8 | MS8 | E | 05-08-1660 | Yes |
| LTC1751EMS8-5#TRPBF | MS-8 | MS8 | E | 05-08-1660 | Yes |
| LTC1751EMS8#PBF | MS-8 | MS8 | E | 05-08-1660 | Yes |
| LTC1751EMS8#TRPBF | MS-8 | MS8 | E | 05-08-1660 | 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 | |
|---|---|---|---|---|---|---|
| LTC1751EMS8-3.3#PBF | MS-8 | E | $2.67 | $2.25 | Yes | |
| LTC1751EMS8-3.3#TRPBF | MS-8 | E | $2.31 | Yes | ||
| LTC1751EMS8-5#PBF | MS-8 | E | $2.67 | $2.25 | Yes | |
| LTC1751EMS8-5#TRPBF | MS-8 | E | $2.31 | Yes | ||
| LTC1751EMS8#PBF | MS-8 | E | $2.67 | $2.25 | Yes | |
| LTC1751EMS8#TRPBF | MS-8 | E | $2.31 | 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.| Part Number | Description | Price | Documentation |
|---|---|---|---|
| DC323A-A | LTC1751EMS8-5 | Regulated Charge Pump DC/DC Converter, 3V to 5.5V Input, 5Vout @ 100mA | Contact Factory | |
| DC323A-B | LTC1751EMS8-3.3 | Regulated Charge Pump DC/DC Converter, 2V to 4.5V Input, 3.3Vout @ 40mA | Contact Factory | |
| DC323A-C | LTC1751EMS8 | Regulated Charge Pump DC/DC Converter, 2.5V to 4.5V Input, 4Vout @ 75mA | Contact Factory | |
| Buy Now | |||
Applications
- Li-Ion Battery Backup Supplies
- Local 3V and 5V Conversion
- Smart Card Readers
- PCMCIA Local 5V Supplies
- White LED Backlighting
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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:
LTC1751
LTC1751-3.3
LTC1751-5
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.
