Power Management
Switching Regulator
Step-Down (Buck) Regulators
Micropower Buck
Power Management
Switching Regulator
Step-Down (Buck) Regulators
Internal Power Switch Buck
Power Management
Switching Regulator
Step-Down (Buck) Regulators
High Input Voltage Buck
Space & Harsh Environment
Extended Temperature Plastic (H & MP)
Extended Temperature (H & MP) Switching Regulators
LT3437 - High Voltage 500mA, 200kHz Step-Down Switching Regulator with 100µA Quiescent Current
Features
- Wide Input Range: 3.3V to 60V
- Load Dump (Input Transient) Protection to 80V
- 500mA Peak Switch Current
- Burst Mode® Operation: 100µA Quiescent Current**
- Low Shutdown Current: IQ < 1µA
- Burst Mode Operation Defeat
- 200kHz Switching Frequency
- Saturating Switch Design: 0.8 Ohm On-Resistance
- Peak Switch Current Maintained Over Full Duty Cycle Range*
- 1.25V Feedback Reference Voltage
- Easily Synchronizable
- Soft-Start Capability
- Small 10-Pin Thermally Enhanced DFN Package
Typical Application
Description
The LT3437 is a 200kHz monolithic buck switching regulator that accepts input voltages up to 80V. A high efficiency 500mA, 0.8 Ohm switch is included on the die along with all the necessary oscillator, control and logic circuitry. Current mode topology is used for fast transient response and good loop stability.Innovative design techniques along with a new high voltage process achieve high efficiency over a wide input range. Efficiency is maintained over a wide output current range by employing Burst Mode operation at low currents, utilizing the output to bias the internal circuitry, and by using a supply boost capacitor to fully saturate the power switch. Burst Mode operation can be defeated by a logic high signal on the SYNC pin which results in lower light load ripple at the expense of light load efficiency. Patented circuitry maintains peak switch current over the full duty cycle range.* Shutdown reduces input supply current to less than 1µA. External synchronization can be implemented by driving the SYNC pin with logic-level inputs. A single capacitor from the CSS pin to the output provides a controlled output voltage ramp (soft-start).
The LT3437 is available in a low profile (0.75mm) 3mm × 3mm 10-pin DFN package or a 16-Pin TSSOP Package both with exposed pad leadframes for low thermal resistance.
*Protected by U.S. Patents including 6498466.
Packaging
For complete and up to date package information and drawings, please refer to our packaging page
DFN-10, TSSOP-16
Order Info
- Part numbers ending in PBF are lead free. Please contact LTC marketing for information on lead based finish parts.
- 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 | Pins | Temp | Price (1-99) | Price (1k)* | RoHS Data |
|---|---|---|---|---|---|---|
| LT3437EDD | DFN | 10 | E | $3.21 | $2.25 | View |
| LT3437EDD#PBF | DFN | 10 | E | $3.21 | $2.25 | View |
| LT3437EDD#TR | DFN | 10 | E | $2.35 | View | |
| LT3437EDD#TRPBF | DFN | 10 | E | $2.35 | View | |
| LT3437EFE | TSSOP | 16 | E | $3.29 | $2.30 | View |
| LT3437EFE#PBF | TSSOP | 16 | E | $3.29 | $2.30 | View |
| LT3437EFE#TR | TSSOP | 16 | E | $2.42 | View | |
| LT3437EFE#TRPBF | TSSOP | 16 | E | $2.42 | View | |
| LT3437HFE#PBF | TSSOP | 16 | H | $4.29 | $3.00 | View |
| LT3437HFE#TRPBF | TSSOP | 16 | H | $3.06 | View | |
| LT3437IDD | DFN | 10 | I | $3.86 | $2.70 | View |
| LT3437IDD#PBF | DFN | 10 | I | $3.86 | $2.70 | View |
| LT3437IDD#TR | DFN | 10 | I | $2.80 | View | |
| LT3437IDD#TRPBF | DFN | 10 | I | $2.80 | View | |
| LT3437IFE | TSSOP | 16 | I | $3.93 | $2.75 | View |
| LT3437IFE#PBF | TSSOP | 16 | I | $3.93 | $2.75 | View |
| LT3437IFE#TR | TSSOP | 16 | I | $2.87 | View | |
| LT3437IFE#TRPBF | TSSOP | 16 | I | $2.87 | View | |
| 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 |
|---|---|---|---|
| DC1232A | LT3437IFE Demo Board I HIGH VOLTAGE 500mA 200kHz BUCK CONVERTER WITH BURST MODE | $100.00 | |
| Buy Now | |||
Applications
- High Voltage Power Conversion
- 14V and 42V Automotive Systems
- Industrial Power Systems
- Distributed Power Systems
- Battery-Powered Systems
- Powered Ethernet
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Simulate
LTspice IV is a powerful, fast and free simulation tool, schematic capture and waveform viewer with enhancements and models for improving the simulation of switching regulators. To download LTspice IV and other FREE simulation tools, please visit our Design Simulation page.
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Related models available in LTspice IV
LT3437
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.
