Power Management
Switching Regulator
Step-Down (Buck) Regulators
Multiple Output Buck
Power Management
Switching Regulator
Step-Down (Buck) Regulators
Poly-Phase Buck Controllers
Power Management
Switching Regulator
Step-Down (Buck) Regulators
External Power Switch Buck Controllers
LTC3727-1 - High Efficiency, 2-Phase Synchronous Step-Down Switching Regulators
Features
- Wide Output Voltage Range:
0.8V < or = VOUT < or = 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 x 5mm QFN Package
Typical Application
Description
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.
Packaging
For complete and up to date package information and drawings, please refer to our packaging page
SSOP-28, QFN-32
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 |
|---|---|---|---|---|---|---|
| LTC3727AEG-1 | SSOP | 28 | E | $6.93 | $4.85 | View |
| LTC3727AEG-1#PBF | SSOP | 28 | E | $6.93 | $4.85 | View |
| LTC3727AEG-1#TR | SSOP | 28 | E | $4.91 | View | |
| LTC3727AEG-1#TRPBF | SSOP | 28 | E | $4.91 | View | |
| LTC3727AIG-1#PBF | SSOP | 28 | I | $8.43 | $5.90 | View |
| LTC3727AIG-1#TRPBF | SSOP | 28 | I | $5.96 | View | |
| LTC3727EG | SSOP | 28 | E | $6.93 | $4.85 | View |
| LTC3727EG#PBF | SSOP | 28 | E | $6.93 | $4.85 | View |
| LTC3727EG#TR | SSOP | 28 | E | $4.95 | View | |
| LTC3727EG#TRPBF | SSOP | 28 | E | $4.95 | View | |
| LTC3727EG-1 | SSOP | 28 | E | $6.93 | $4.85 | View |
| LTC3727EG-1#PBF | SSOP | 28 | E | $6.93 | $4.85 | View |
| LTC3727EG-1#TR | SSOP | 28 | E | $4.95 | View | |
| LTC3727EG-1#TRPBF | SSOP | 28 | E | $4.95 | View | |
| LTC3727EUH-1 | QFN | 32 | E | $7.21 | $5.05 | View |
| LTC3727EUH-1#PBF | QFN | 32 | E | $7.21 | $5.05 | View |
| LTC3727EUH-1#TR | DFN | 32 | E | $5.15 | View | |
| LTC3727EUH-1#TRPBF | DFN | 32 | E | $5.15 | View | |
| LTC3727IG-1#PBF | SSOP | 28 | I | $8.43 | $5.90 | View |
| LTC3727IG-1#TRPBF | SSOP | 28 | I | $5.96 | View | |
| LTC3727LXEG-1 | SSOP | 28 | E | $6.21 | $4.35 | View |
| LTC3727LXEG-1#PBF | SSOP | 28 | E | $6.21 | $4.35 | View |
| LTC3727LXEG-1#TR | SSOP | 28 | E | $4.45 | View | |
| LTC3727LXEG-1#TRPBF | SSOP | 28 | E | $4.45 | View | |
| LTC3727LXEUH-1 | QFN | 32 | E | $6.57 | $4.60 | View |
| LTC3727LXEUH-1#PBF | QFN | 32 | E | $6.57 | $4.60 | View |
| LTC3727LXEUH-1#TR | QFN | 32 | E | $4.70 | View | |
| LTC3727LXEUH-1#TRPBF | QFN | 32 | E | $4.70 | View | |
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Demo Boards
Linear Technology demo boards are offered free of charge to qualified customers. Contact your local sales office or distributor to request 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
- Battery-Operated Digital Devices
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.
To launch a ready to run LTspice demonstration circuit for this part:
- Step 1: If you have not installed LTspice on this computer, download and install LTspice IV
- Step 2: Once LTspice is installed, click on the link(s) below to launch the simulation
- Step 3: If LTspice IV does not automatically open after clicking the link above, you can instead run the simulation by right clicking on the link and selecting "Save Target As". After saving the file to your computer, start LTspice and open the demonstration circuit by selecting 'Open' from the 'File' menu
To explore other ready to run LTspice demonstration circuits, please visit our Demo Circuits Collection.
Related models available in LTspice IV
LTC3727-1
LTC3727
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.
