LTC3770 - Fast No RSENSE Step-Down Synchronous Controller with Margining, Tracking and PLL
Features
- Wide VIN Range: 4V to 32V
- ±0.67% 0.6V Reference Voltage
- Output Voltage Tracking Capability
- Programmable Margining
- Sense Resistor Optional
- True Current Mode Control
- 2% to 90% Duty Cycle at 200kHz
- tON(MIN) ≤ 100ns
- Phase Lock Loop Frequency Synchronization
- Powerful Dual N-Channel MOSFET Driver
- Adjustable Cycle-by-Cycle Current Limit
- Adjustable Switching Frequency
- Programmable Soft-Start
- Current Foldback Protection (Disabled at Start-Up)
- Output Overvoltage Protection
- Micropower Shutdown: IQ < 30µA
- Power Good Output Voltage Monitor Tracks the Reference Input Pin
- Available in (5mm × 5mm) QFN and 28-Lead SSOP Packages
Typical Application
Description
The LTC3770 is a synchronous step-down switching regulator controller with output voltage up/down tracking capability and voltage margining. Its advanced functions and high accuracy reference are ideal for powering high performance server, ASIC and computer memory systems.
The LTC3770 uses a constant on-time, valley current mode control architecture to deliver very low duty factors without requiring a sense resistor. The operating frequency is selected by an external resistor and is compensated for variations in input supply voltage. An internal phase-lock loop allows the IC to be synchronized to an external clock.
Fault protection is provided by an overvoltage comparator and input undervoltage lockout. The regulator current limit is user programmable. A wide supply range allows voltages as high as 32V to be stepped down to as low as a 0.6V output. Power supply sequencing is accomplished using an external soft-start timing capacitor.
Packaging
For complete and up to date package information and drawings, please refer to our packaging page
QFN-32, SSOP-28
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 |
|---|---|---|---|---|---|---|
| LTC3770EG | SSOP | 28 | E | $4.23 | $3.55 | View |
| LTC3770EG#PBF | SSOP | 28 | E | $4.23 | $3.55 | View |
| LTC3770EG#TR | SSOP | 28 | E | $3.65 | View | |
| LTC3770EG#TRPBF | SSOP | 28 | E | $3.65 | View | |
| LTC3770EUH#PBF | QFN | 32 | E | $4.23 | $3.55 | View |
| LTC3770EUH#TRPBF | QFN | 32 | E | $3.65 | 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 |
|---|---|---|---|
| DC774A | LTC3770EUF | High Efficiency, High Power Buck Converter with Margining & Tracking, 5V to 28Vin, 2.5Vout @ 10A | $125.00 | |
| Buy Now | |||
Applications
- Distributed Power Systems
- Server Power Supply
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Simulate
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Related models available in LTspice IV
LTC3770
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.
