LTC3727LX-1 - High Efficiency, 2-Phase Synchronous Step-Down Switching Regulator
Features
- 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
- ±1.5% Output Voltage Accuracy
- Power Good Output Voltage Monitor
- Phase-Lockable Fixed Frequency 250kHz to 550kHz
- Dual N-Channel MOSFET Synchronous Drive
- Wide VIN Range: 4V to 32V 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 and 5mm × 5mm QFN Packages
Typical Application
Description
The LTC3727LX-1 is a high performance dual step-down switching regulator controller that drives 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 28V (32V maximum) input supply range encompasses all battery chemistries.
| 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 |
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 |
|---|---|---|---|---|---|
| LTC3727LXEG-1#PBF | SSOP-28 | G | E | 05-08-1640 (G28) | Yes |
| LTC3727LXEG-1#TRPBF | SSOP-28 | G | E | 05-08-1640 (G28) | Yes |
| LTC3727LXEUH-1#PBF | 5x5 QFN-32 | UH | E | 05-08-1693 | Yes |
| LTC3727LXEUH-1#TRPBF | 5x5 QFN-32 | UH | E | 05-08-1693 | 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 | |
|---|---|---|---|---|---|---|
| LTC3727LXEG-1#PBF | SSOP-28 | E | $6.21 | $4.35 | Yes | |
| LTC3727LXEG-1#TRPBF | SSOP-28 | E | $4.45 | Yes | ||
| LTC3727LXEUH-1#PBF | 5x5 QFN-32 | E | $6.57 | $4.60 | Yes | |
| LTC3727LXEUH-1#TRPBF | 5x5 QFN-32 | E | $4.70 | 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.Click here to view our complete list of demo boards
Applications
- Telecom Systems
- Automotive Systems
- Distributed DC Power Systems
People Who Viewed This Product Also Viewed
- LTC3727 - High Efficiency, 2-Phase Synchronous Step-Down Switching Regulators
- LTC3727A-1 - High Efficiency, 2-Phase Synchronous Step-Down Switching Regulators
- LTC3727-1 - High Efficiency, 2-Phase Synchronous Step-Down Switching Regulators
- LT8610 - 42V, 2.5A Synchronous Step-Down Regulator with 2.5μA Quiescent Current
- LT3800 - High-Voltage Synchronous Current Mode Step-Down Controller
- LT3724 - High Voltage, Current Mode Switching Regulator Controller
- LT8611 - 42V, 2.5A Synchronous Step-Down Regulator with Current Sense and 2.5μA Quiescent Current
- LTC3890 - 60V Low IQ, Dual, 2-Phase Synchronous Step-Down DC/DC Controller
- LT3511 - Monolithic High Voltage Isolated Flyback Converter
- LTC3891 - Low IQ, 60V Synchronous Step-Down Controller
Product Notifications
Please login to your MyLinear account for notifications of datasheet updates, new document releases and LTspice model announcements for your favorite products. If you do not have a MyLinear account you may Sign Up Now.
Forgot your password? Click here.
Need help? Email mylinear@linear.com with questions and comments.
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:
LTC3727
LTC3727-1
LTC3727A-1
LTC3727LX-1
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.
