LTC1704 - 550kHz Synchronous Switching Regulator Controller Plus Linear Regulator Controller
Features
- Dual Regulated Outputs: One Switching Regulator and One Linear Regulator
- Excellent DC Accuracy: ±1.5% for Switcher and ±2% for Linear Regulator
- External N-Channel MOSFET Architecture
- No External Current Sense Resistor Required
- Burst Mode® Operation at Light Load (LTC1704)
- Continuous Switching at Light Load (LTC1704B)
- Linear Regulator with Programmable Current Limit
- Linear Regulator with Programmable Start-Up Delay
- Low Shutdown Current: <150µA
- High Efficiency Over Wide Load Current Range
- PGOOD Flag Monitors Both Outputs
- Small 16-Pin Narrow SSOP Package
Typical Application
Description
The LTC1704/LTC1704B include a high power synchronous switching regulator controller plus a linear regulator controller. The switching regulator controller is designed to drive a pair of N-channel MOSFETs in a voltage mode, synchronous buck configuration to provide the main supply. The constant frequency, true PWM architecture switches at 550kHz, minimizing external component size, cost and optimizing load transient performance. The LTC1704 features automatic transition to power saving Burst Mode operation at light loads. The LTC1704B does not shift into Burst Mode operation at light loads, eliminating low frequency output ripple at the expense of light load efficiency. The linear regulator controller is designed to drive an external NPN power transistor to provide up to 2A of current to an auxiliary load.
The LTC1704/LTC1704B deliver better than ±1.5% DC accuracy at the switcher outputs and ±2% at the linear regulator outputs. High performance feedback loops allow the circuit to keep total output regulation within ±5% under all transient conditions. An open-drain PGOOD output indicates when both outputs are within ±10% of their regulated values.
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 |
|---|---|---|---|---|---|
| LTC1704BEGN#PBF | SSOP-16 | GN | E | 05-08-1641 (GN16) | Yes |
| LTC1704BEGN#TRPBF | SSOP-16 | GN | E | 05-08-1641 (GN16) | Yes |
| LTC1704EGN#PBF | SSOP-16 | GN | E | 05-08-1641 (GN16) | Yes |
| LTC1704EGN#TRPBF | SSOP-16 | GN | E | 05-08-1641 (GN16) | 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 | |
|---|---|---|---|---|---|---|
| LTC1704BEGN#PBF | SSOP-16 | E | $5.89 | $4.10 | Yes | |
| LTC1704BEGN#TRPBF | SSOP-16 | E | $4.20 | Yes | ||
| LTC1704EGN#PBF | SSOP-16 | E | $5.89 | $4.10 | Yes | |
| LTC1704EGN#TRPBF | SSOP-16 | E | $4.20 | 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 |
|---|---|---|---|
| DC357A-A | LTC1704EGN | 550kHz Synchronous Buck, Burst Mode With Linear Regulator | Contact Factory | |
| DC357A-B | LTC1704BEGN | 550kHz Synchronous Buck With Linear Regulator | Contact Factory | |
| Buy Now | |||
Applications
- Multiple Logic Supply Generator
- Distributed Power Applications
- High Efficiency Power Conversion
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Design Tools
Linear Technology provides a variety of custom design simulation tools and device models to allow even novice designers to quickly and easily evaluate circuits using high performance switching regulators, amplifiers, data converters, filters and more. Please visit our Design Tools page to view and download:
- LTspice - A powerful SPICE simulator, schematic capture and waveform viewer with enhancements and models for easing the simulation of switching regulators
- LTpowerCAD - A complete power supply selection, synthesis and design tool
- LTpowerPlay - A development environment supporting Linear Technology's Digital Power System Management (PSM) products
- PScope & QuikEval - USB-based product demonstration and data acquisition system for use with our ADCs, DACs, and more
- Linduino - Arduino compatible system for developing and distributing firmware libraries and example code
- LinearLab Tools - A collection of Matlab and Python programs that provide direct access to Linear Technology’s data converter evaluation boards
- And More!
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.
