LTC1435 - High Efficiency Low Noise Synchronous Step-Down Switching Regulator
Features
- Dual N-Channel MOSFET Synchronous Drive
- Programmable Fixed Frequency
- Wide VIN Range: 3.5V to 36V Operation
- Ultrahigh Efficiency
- Very Low Dropout Operation: 99% Duty Cycle
- Low Standby Current
- Secondary Feedback Control
- Programmable Soft Start
- Remote Output Voltage Sense
- Logic Controlled Micropower Shutdown: IQ <25µA
- Foldback Current Limiting (Optional)
- Current Mode Operation for Excellent Line and Load Transient Response
- Output Voltages from 1.19V to 9V
- Available in 16-Lead Narrow SO and SSOP Packages
AEC-Q100 data available for specific packages
Typical Application
Description
The LTC1435 is a synchronous step-down switching regulator controller that drives external N-channel power MOSFETs using a fixed frequency architecture. Burst Mode™ operation provides high efficiency at low load currents. A maximum duty cycle limit of 99% provides low dropout operation which extends operating time in battery-operated systems.
The operating frequency is set by an external capacitor allowing maximum flexibility in optimizing efficiency. A secondary winding feedback control pin, SFB, guarantees regulation regardless of load on the main output by forcing continuous operation. Burst Mode operation is inhibited when the SFB pin is pulled low which reduces noise and RF interference.
Soft start is provided by an external capacitor which can be used to properly sequence supplies. The operating current level is user-programmable via an external current sense resistor. Wide input supply range allows operation from 3.5V to 30V (36V maximum).
For a guaranteed and test minimum on-time refer to the LTC1435A, the "A" version of the LTC1435. The minimum on-time of the LTC1435A is guaranteed to be <=300ns. The only difference between these two parts is this guaranteed minimum on-time. Pricing is the same.
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 |
|---|---|---|---|---|---|
| LTC1435CG#PBF | SSOP-16 | G | C | 05-08-1640 (G16) | Yes |
| LTC1435CG#TRPBF | SSOP-16 | G | C | 05-08-1640 (G16) | Yes |
| LTC1435CS#PBF | SO-16 | S | C | 05-08-1610 (S16) | Yes |
| LTC1435CS#TRPBF | SO-16 | S | C | 05-08-1610 (S16) | Yes |
| LTC1435IG#PBF | SSOP-16 | G | I | 05-08-1640 (G16) | Yes |
| LTC1435IG#TRPBF | SSOP-16 | G | I | 05-08-1640 (G16) | Yes |
| LTC1435IS#PBF | SO-16 | S | I | 05-08-1610 (S16) | Yes |
| LTC1435IS#TRPBF | SO-16 | S | I | 05-08-1610 (S16) | 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 | |
|---|---|---|---|---|---|---|
| LTC1435CG#PBF | SSOP-16 | C | $5.55 | $4.50 | Yes | |
| LTC1435CG#TRPBF | SSOP-16 | C | $4.56 | Yes | ||
| LTC1435CS#PBF | SO-16 | C | $4.91 | $4.15 | Yes | |
| LTC1435CS#TRPBF | SO-16 | C | $4.21 | Yes | ||
| LTC1435IG#PBF | SSOP-16 | I | $6.90 | $5.65 | Yes | |
| LTC1435IG#TRPBF | SSOP-16 | I | $5.71 | Yes | ||
| LTC1435IS#PBF | SO-16 | I | $6.45 | $5.20 | Yes | |
| LTC1435IS#TRPBF | SO-16 | I | $5.26 | 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 |
|---|---|---|---|
| DC094A | LTC1435 | CONSTANT FREQ HIGH EFF. 3A CONVERTER JPR SEL 1.8V, 2.5V, 2.9V, 3.3V or 5V | $100.00 | |
| Buy Now | |||
Designed for Automotive and Transportation Applications
AEC-Q100 data is available for these specific part numbers. Please contact your local sales representative for more information regarding reliability reports or to inquire about parts that are not included. For more information, view our Automotive and Transportation page
| Part Number | Package | Temp | Price (1-99) |
Price (1k)* |
RoHS | |
|---|---|---|---|---|---|---|
| LTC1435IG#PBF | SSOP-16 | I | $6.90 | $5.65 | Yes | |
| LTC1435IG#TRPBF | SSOP-16 | I | $5.71 | Yes | ||
| Buy Now • Request Samples | ||||||
Applications
- Notebook and Palmtop Computers, PDAs
- Cellular Telephones and Wireless Modems
- Portable Instruments
- Battery-Operated Devices
- DC Power Distribution 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:
LTC1435A
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.
