Overview
Features and Benefits
- Wide Output Voltage Range:
- 0.8V ≤ VOUT ≤ 14V
- Out-of-Phase Controllers Reduce Required Input Capacitance and Power Supply Induced Noise
- OPTI-LOOP® Compensation Minimizes COUT
- ±1% Output Voltage Accuracy
- Power Good Output Voltage Monitor
- Phase-Lockable Fixed Frequency 250kHz to 550kHz
- Latched Short-Circuit Shutdown (LTC3727 Only)
- Dual N-Channel MOSFET Synchronous Drive
- Wide VIN Range: 4V to 36V Operation
- Very Low Dropout Operation: 99% Duty Cycle
- Adjustable Soft-Start Current Ramping
- Foldback Output Current Limiting
- Output Overvoltage Protection
- Low Shutdown IQ: 20µA
- Selectable Constant Frequency or Burst Mode® Operation
- Small 28-Lead SSOP Package
- LTC3727-1 Also Available in the 5mm × 5mm QFN Package
Product Details
The LTC3727/LTC3727-1 are high performance dual step-down switching regulator controllers that drive all N-channel synchronous power MOSFET stages. A constant frequency current mode architecture allows phase-lockable frequency of up to 550kHz. Power loss and noise due to the ESR of the input capacitors are minimized by operating the two controller output stages out of phase.
OPTI-LOOP compensation allows the transient response to be optimized over a wide range of output capacitance and ESR values. There is a precision 0.8V reference and a power good output indicator. A wide 4V to 30V (36V maximum) input supply range encompasses all battery chemistries.
A RUN/SS pin for each controller provides soft-start, and on the LTC3727GN, optional timed, short-circuit shutdown. Current foldback limits MOSFET heat dissipation during short-circuit conditions when overcurrent latchoff is disabled. Output overvoltage protection circuitry latches on the bottom MOSFET until VOUT returns to normal. The FCB mode pin can select among Burst Mode, constant frequency mode and continuous inductor current mode or regulate a secondary winding.
| Vin Range | Vref Accuracy Over Temp | Latch-Off | Min On-Time | |
| LTC3727 |
4V - 36V |
±1% |
No | 180ns |
| LTC3727-1 |
4V - 36V |
±1% |
Yes | 180ns |
| LTC3727A-1 |
4V - 36V |
±1% |
No | 120ns |
| LTC3727LX-1 |
4V - 32V |
±1.5% |
No | 120ns |
Applications
- Telecom Systems
- Automotive Systems
- Battery-Operated Digital Devices
Product Lifecycle
Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Documentation & Resources
Tools & Simulations
LTspice
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.
Models for the following parts are available in LTspice:
LTC3727
LTC3727-1
LTC3727A-1
LTC3727LX-1
Product Recommendations
LTC3727 Companion Parts
Design Resources
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 Number | Material Declaration | Reliability Data | Pin/Package Drawing | CAD Symbols, Footprints & 3D Models |
|---|---|---|---|---|
| LTC3727EG#PBF | Material Declaration | Reliability Data | 28-Lead SSOP | |
| LTC3727EG#TRPBF | Material Declaration | Reliability Data | 28-Lead SSOP | |
| Wafer Fabrication Data | R384 Reliability Data |
PCN-PDN Information
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Support & Discussions
LTC3727 Discussions
Sample & Buy
Ordering FAQs
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Buy Now Pricing
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List Pricing
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Lead Times
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Sampling
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