LTC1627 - Monolithic Synchronous Step-Down Switching Regulator
Features
- High Efficiency: Up to 95%
- Constant Frequency 350kHz Operation
- 2.65V to 8.5V VIN Range
- VOUT from 0.8V to VIN, IOUT to 500mA
- No Schottky Diode Required
- Synchronizable Up to 525kHz
- Selectable Burst Mode™ Operation
- Low Dropout Operation: 100% Duty Cycle
- Precision 2.5V Undervoltage Lockout
- Secondary Winding Regulation
- Current Mode Operation for Excellent Line and Load Transient Response
- Low Quiescent Current: 200µA
- Shutdown Mode Draws Only 15µA Supply Current
- ±1.5% Reference Accuracy
- Available in 8-Lead SO Package
Typical Application
Description
The LTC1627 is a monolithic current mode synchronous buck regulator using a fixed frequency architecture. The operating supply range is from 8.5V down to 2.65V, making it suitable for one or two lithium-ion battery-powered applications. Burst Mode operation provides high efficiency at low load currents. 100% duty cycle provides low dropout operation, which extends operating time in battery-operated systems.The operating frequency is internally set at 350kHz, allowing the use of small surface mount inductors. For switching noise sensitive applications it can be externally synchronized up to 525kHz. The SYNC/FCB control pin guarantees regulation of secondary windings regardless of load on the main output by forcing continuous operation. Burst Mode operation is inhibited during synchronization or when the SYNC/FCB pin is pulled low to reduce noise and RF interference. Soft-start is provided by an external capacitor.
Optional bootstrapping enhances the internal switch drive for single lithium-ion cell applications. The internal synchronous switch increases efficiency and eliminates the need for an external Schottky diode, saving components and board space. The LTC1627 comes in an 8-lead 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 |
|---|---|---|---|---|---|
| LTC1627CS8#PBF | SO-8 | S8 | C | 05-08-1610 (S8) | Yes |
| LTC1627CS8#TRPBF | SO-8 | S8 | C | 05-08-1610 (S8) | Yes |
| LTC1627IS8#PBF | SO-8 | S8 | I | 05-08-1610 (S8) | Yes |
| LTC1627IS8#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 | |
|---|---|---|---|---|---|---|
| LTC1627CS8#PBF | SO-8 | C | $2.35 | $2.05 | Yes | |
| LTC1627CS8#TRPBF | SO-8 | C | $2.11 | Yes | ||
| LTC1627IS8#PBF | SO-8 | I | $3.55 | $3.05 | Yes | |
| LTC1627IS8#TRPBF | SO-8 | I | $3.11 | 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 |
|---|---|---|---|
| DC195A | LTC1627CS8 | MONOLITHIC SYCHR., STEP-DOWN REGULATOR, 2.65V to 8.5Vin, 1.8V to 3.3Vout @ 500mA | $100.00 | |
| Buy Now | |||
Applications
- Cellular Telephones
- Portable Instruments
- Wireless Modems
- RF Communications
- Distributed Power Systems
- Scanners
- Single and Dual Cell Lithium
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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:
LTC1627
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.
