LTC3458 - 1.4A, 1.5MHz Synchronous Step-Up DC/DC Converter with Output Disconnect
Features
- High Efficiency: Up to 93%
- Inrush Current Limiting and Output Disconnect
- Programmable Output Voltages up to 7.5V
- 1.5V to 6V Input Range
- Programmable/Synchronizable Fixed Frequency Operation up to 1.5MHz
- Programmable Automatic Burst Mode® Operation
- Current Mode Control with Programmable Soft-Start Period and Peak Current Limit
- 700mA at 7V from 5V Input
- 0.3 Ohm N-Channel and 0.4 Ohm P-Channel 1.4A Switches at 5VOUT
- Ultralow Quiescent Currents: 15µA Sleep, <1µA in Shutdown
- 3mm × 4mm Thermally Enhanced DFN Package
Typical Application
Description
The LTC3458 is a high efficiency, current mode, fixed frequency, step up DC/DC converter with true output disconnect and inrush current limiting. The LTC3458 is rated for a 7.5V output and includes a 0.3 Ohm N-channel MOSFET switch and a 0.4 Ohm P-channel MOSFET synchronous rectifier. The LTC3458 is well suited for battery powered applications and includes programmable output voltage, switching frequency and loop compensation. The oscillator frequency can be set up to 1.5MHz or synchronized to an external clock.
Quiescent current is only 15µA during Burst Mode operation maximizing battery life in portable applications. The Burst Mode current threshold, peak current limit, and softstart are externally programmable. Other features include <1µA shutdown current, antiringing control, and thermal limit. The LTC3458 is available in a low profile (0.75mm), 3mm × 4mm 12-pin DFN package.
| Vout Range | Switch Current | |
| LTC3458 | 2.0V to 7.5V | 1.4A |
| LTC3458L | 2.0V to 6.0V | 1.7A |
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 |
|---|---|---|---|---|---|
| LTC3458EDE#PBF | 4x3 DFN-12 | DE/UE | E | 05-08-1695 | Yes |
| LTC3458EDE#TRPBF | 4x3 DFN-12 | DE/UE | E | 05-08-1695 | 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 | |
|---|---|---|---|---|---|---|
| LTC3458EDE#PBF | 4x3 DFN-12 | E | $3.93 | $3.30 | Yes | |
| LTC3458EDE#TRPBF | 4x3 DFN-12 | E | $3.40 | 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 |
|---|---|---|---|
| DC728A | LTC3458EDE Demo Board | 2V ≤ VIN ≤ 6V, Vout = 7V @ 200mA-800mA | $100.00 | |
| Buy Now | |||
Applications
- Point-of-Load Regulators
- USB VBUS Power
- LCD Bias
- OLED Displays
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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:
LTC3458
LTC3458L
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.
