LTC1700 - No RSENSE Synchronous Step-Up DC/DC Controller
Features
- High Efficiency: Up to 95%
- No Current Sense Resistor Required
- Constant Frequency 530kHz Operation Allows Small Size, Surface Mount Inductors
- OPTI-LOOP® Compensation Minimizes COUT
- Selectable Burst Mode® Operation
- Minimum Start-Up Voltage as Low as 0.9V
- Synchronizable Between 400kHz and 750kHz
- Micropower Shutdown: 10µA
- Current Mode Operation for Excellent Line and Load Transient Response
- Soft-Start Reduces Supply Current Transients
- 1.5% Output Voltage Accuracy
- Uses Low Value, Small Size, Surface Mount Inductors
- Available in 10-Lead MSOP Package
Typical Application
Description
The LTC1700 is a current mode synchronous step-up DC/DC controller that drives external N-channel and P-channel power MOSFETs using a constant frequency PWM architecture. Current limiting is provided by sensing the voltage drop across the main MOSFET, eliminating the need of a sense resistor. This No RSENSE technique helps the LTC1700 maintain high efficiency at heavy loads while Burst Mode operation ensures high efficiency at light loads, thus providing high efficiencies over a wide range of load currents.
The LTC1700 operates at a minimum input voltage as low as 0.9V. The device boasts a ±1.5% output voltage accuracy and consumes only 200µA of quiescent current. In shutdown, it only draws 10µA.
To prevent inductor current runaway, the duty cycle is limited to 90%. Overvoltage protection is also provided which shuts both the external MOSFETs off when tripped.
High constant operating frequency of 530kHz allows the use of small inductors and output capacitors. The LTC1700 can also be synchronized between 400kHz to 750kHz. Burst Mode operation is inhibited when the device is externally clocked or when the SYNC/MODE pin is pulled low to reduce noise and RF interference.
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 |
|---|---|---|---|---|---|
| LTC1700EMS#PBF | MS-10 | MS | E | 05-08-1661 | Yes |
| LTC1700EMS#TRPBF | MS-10 | MS | E | 05-08-1661 | 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 | |
|---|---|---|---|---|---|---|
| LTC1700EMS#PBF | MS-10 | E | $3.07 | $2.60 | Yes | |
| LTC1700EMS#TRPBF | MS-10 | E | $2.66 | 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 |
|---|---|---|---|
| DC349B | LTC1700EMS | No Rsense, 2.5Vin to 3.3Vout @ 1A or 5.0Vout @ 800mA | $100.00 | |
| Buy Now | |||
Applications
- Cellular Telephones
- Wireless Modems
- RF Communications
- 2.5V to 3.3V, 2.5V to 5V Converters
- Battery-Powered Equipment
- Telecom/Network Systems
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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:
LTC1700
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.
