LTC1701 - 1MHz Step-Down DC/DC Converter in SOT-23
Features
- Tiny 5-Lead SOT-23 Package
- Uses Tiny Capacitors and Inductor
- High Frequency Operation: 1MHz
- High Output Current: 500mA
- Low RDS(ON) Internal Switch: 0.28 Ohms
- High Efficiency: Up to 94%
- Current Mode Operation for Excellent Line and Load Transient Response
- Short-Circuit Protected
- Low Quiescent Current: 135µA (LTC1701)
- Low Dropout Operation: 100% Duty Cycle
- Ultralow Shutdown Current: IQ < 1µA
- Peak Inductor Current Independent of Inductor Value
- Output Voltages from 5V Down to 1.25V
Typical Application
Description
The LTC1701/LTC1701B are the industry's first SOT-23 step-down, current mode, DC/DC converters. Intended for low to medium power applications, they operate from 2.5V to 5.5V input voltage range and switch at 1MHz, allowing the use of tiny, low cost capacitors and inductors 2mm or less in height. The output voltage is adjustable from 1.25V to 5V. A built-in 0.28 Ohm switch allows up to 0.5A of output current at high efficiency. OPTI-LOOP compensation allows the transient response to be optimized over a wide range of loads and output capacitors.
The LTC1701 incorporates automatic power saving BurstMode operation to reduce gate charge losses when the load current drops below the level required for continuous operation. The LTC1701B operates continuously to very low load currents to provide low ripple at the expense of light load efficiency. With no load, the LTC1701 draws only 135µA. In shutdown, both devices draw less than 1µA, making them ideal for current sensitive applications.
Their small size and switching frequency enables a complete DC/DC converter function to consume less than 0.3 square inches of PC board area.
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 |
|---|---|---|---|---|---|
| LTC1701BES5#PBF | SOT-23 | S5 | E | 05-08-1635 | Yes |
| LTC1701BES5#TRMPBF | SOT-23 | S5 | E | 05-08-1635 | Yes |
| LTC1701BES5#TRPBF | SOT-23 | S5 | E | 05-08-1635 | Yes |
| LTC1701ES5#PBF | SOT-23 | S5 | E | 05-08-1635 | Yes |
| LTC1701ES5#TRMPBF | SOT-23 | S5 | E | 05-08-1635 | Yes |
| LTC1701ES5#TRPBF | SOT-23 | S5 | E | 05-08-1635 | 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 | |
|---|---|---|---|---|---|---|
| LTC1701BES5#PBF | SOT-23 | E | $2.36 | Yes | ||
| LTC1701BES5#TRMPBF | SOT-23 | E | $2.36 | $2.02 | Yes | |
| LTC1701BES5#TRPBF | SOT-23 | E | $2.36 | $2.00 | Yes | |
| LTC1701ES5#PBF | SOT-23 | E | $2.36 | Yes | ||
| LTC1701ES5#TRMPBF | SOT-23 | E | $2.36 | $2.02 | Yes | |
| LTC1701ES5#TRPBF | SOT-23 | E | $2.36 | $2.00 | 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 |
|---|---|---|---|
| DC289A | LTC1701ES5 | 0.5A, SOT-23, DC/DC Converter, Vin=2.5V to 5.5V, Vout=1.5V/2.5V/3.3V | $75.00 | |
| DC376A | LTC1701BES5 | 0.5A, SOT-23, DC/DC Converter, Vin=2.5V to 5.5V, Vout=1.5V/2.5V/3.3V | Contact Factory | |
| Buy Now | |||
Applications
- PDAs/Palmtop PCs
- Digital Cameras
- Cellular Phones
- Portable Media Players
- PC Cards
- Handheld Equipment
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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:
LTC1701
LTC1701B
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.
