LTC3708
PRODUCTIONFast 2-Phase, No RSENSE Buck Controller with Output Tracking
- Part Models
- 2
- 1ku List Price
- Starting From $8.03
Overview
- Very Low Duty Factor Operation (tON(MIN) < 85ns)
- No RSENSE™ Option for Maximum Efficiency
- Very Fast Transient Response
- Programmable Output Voltage Up/Down Tracking
- 2-Phase Operation Reduces Input Capacitance
- 0.6V ±1% Output Voltage Reference
- External Frequency Synchronization
- Monotonic Soft-Start
- On-board High Current MOSFET Drivers
- Wide VIN Range: Up to 36V
- Adjustable Cycle-by-Cycle Current Limit
- Instant Output Overvoltage Protection
- Optional Short-Circuit Shutdown Timer
- Power Good Output with 100µs Masking
- Available in 5mm × 5mm QFN Package
The LTC3708 is a dual, 2-phase synchronous step-down switching regulator with output voltage up/down tracking capability. The IC allows either coincident or ratiometric tracking. Multiple LTC3708s can be daisy-chained in applications requiring more than two voltages to be tracked. Power supply sequencing is accomplished using an external soft-start timing capacitor.
The LTC3708 uses a constant on-time, valley current mode control architecture to deliver very low duty factors without requiring a sense resistor. Operating frequency is selected by an external resistor and is compensated for variations in input supply voltage. An internal phase-locked loop allows the IC to be synchronized to an external clock.
Fault protection is provided by an output overvoltage comparator and an optional short-circuit shutdown timer. The regulator current limit level is user programmable. A wide supply range allows voltages as high as 36V to be stepped down to 0.6V output.
Applications
- Notebook and Palmtop Computers, PDAs
- Digital Signal Processors
- Network Servers
Documentation
Data Sheet 1
Design Note 3
Technical Articles 1
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.
| Part Model | Pin/Package Drawing | Documentation | CAD Symbols, Footprints, and 3D Models |
|---|---|---|---|
| LTC3708EUH#PBF | 32-Lead QFN (5mm x 5mm x 0.75mm w/ EP) | ||
| LTC3708EUH#TRPBF | 32-Lead QFN (5mm x 5mm x 0.75mm w/ EP) |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Jan 20, 2022 - 21_0269 Addition of Alternate Assembly Site ASE Taiwan for Select LFCSP Products |
||
| LTC3708EUH#PBF | PRODUCTION | |
| LTC3708EUH#TRPBF | PRODUCTION | |
This is the most up-to-date revision of the Data Sheet.
Software Resources
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Request a Driver/SoftwareHardware Ecosystem
| Parts | Product Life Cycle | Description |
|---|---|---|
| Circuit Monitors 1 | ||
| LTC2960 | RECOMMENDED FOR NEW DESIGNS | 36V Nano-Current Two-Input Voltage Monitor |
| Hot Swap Controllers 1 | ||
| LT4363 | RECOMMENDED FOR NEW DESIGNS | High Voltage Surge Stopper with Current Limit |
| Switching Regulators & Controllers 1 | ||
| LTC3880 | RECOMMENDED FOR NEW DESIGNS | Dual Output PolyPhase Step-Down DC/DC Controller with Digital Power System Management |
| Parts | Product Life Cycle | Description |
|---|---|---|
| LTC3838 | RECOMMENDED FOR NEW DESIGNS | Dual, Fast, Accurate Step- Down DC/DC Controller with Differential Output Sensing |
Tools & Simulations
LTspice
Models for the following parts are available in LTspice:
- LTC3708
LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.
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