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
LTC3736-1 - Dual 2-Phase, No RSENSE Synchronous Controller with Spread Spectrum
Features
- Spread Spectrum Operation
- Tracking Function
- No Current Sense Resistors Required
- Out-of-Phase Controllers Reduce Required
- Input Capacitance
- Wide VIN Range: 2.75V to 9.8V
- Current Mode Operation
- 0.6V ±1.5% Voltage Reference
- Low Dropout Operation: 100% Duty Cycle
- Pulse Skipping Operation at Light Loads
- Internal Soft-Start Circuitry
- Power Good Output Voltage Monitor
- Output Overvoltage Protection
- Micropower Shutdown: IQ = 9µA
- Tiny Low Profile (4mm × 4mm) QFN and Narrow SSOP Packages
Typical Application
Description
The LTC3736-1 is a 2-phase dual synchronous stepdown switching regulator controller with tracking that drives external complementary power MOSFETs using few external components. The constant frequency current mode architecture with MOSFET VDS sensing eliminates the need for sense resistors and improves efficiency. Power loss and noise due to the ESR of the input capacitance are minimized by operating the two controllers out of phase.
A unique spread spectrum architecture randomly varies the LTC3736-1’s switching frequency from 450kHz to 580kHz, significantly reducing the peak radiated and conducted noise on both the input and output supplies, making it easier to comply with electromagnetic interference (EMI) standards.
Pulse skipping operation provides high efficiency at light loads. 100% duty cycle capability provides low dropout operation, extending operating time in battery-powered systems. The high switching frequencies allow for the use of small surface mount inductors and capacitors.
The LTC3736-1 is available in the low profile (0.75mm) 24-pin thermally enhanced (4mm × 4mm) QFN package and 24-lead narrow SSOP packages.
No RSENSE is a trademark of Linear Technology Corporation. Protected by U.S. Patents including 5481178, 5929620, 6144194, 6580258, 6304066, 6611131, 6498466.
Packaging
For complete and up to date package information and drawings, please refer to our packaging page
QFN-24, SSOP-24
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 |
|---|---|---|---|---|---|---|
| LTC3736EGN | SSOP | 24 | E | $5.45 | $3.80 | View |
| LTC3736EGN#PBF | SSOP | 24 | E | $5.45 | $3.80 | View |
| LTC3736EGN#TR | SSOP | 24 | E | $3.86 | View | |
| LTC3736EGN#TRPBF | SSOP | 24 | E | $3.86 | View | |
| LTC3736EGN-1 | SSOP | 24 | E | $6.25 | $4.40 | View |
| LTC3736EGN-1#PBF | SSOP | 24 | E | $6.25 | $4.40 | View |
| LTC3736EGN-1#TR | SSOP | 24 | E | $4.50 | View | |
| LTC3736EGN-1#TRPBF | SSOP | 24 | E | $4.50 | View | |
| LTC3736EGN-2 | SSOP | 24 | E | $5.45 | $3.80 | View |
| LTC3736EGN-2#PBF | SSOP | 24 | E | $5.45 | $3.80 | View |
| LTC3736EGN-2#TR | SSOP | 24 | E | $3.86 | View | |
| LTC3736EGN-2#TRPBF | SSOP | 24 | E | $3.86 | View | |
| LTC3736EUF | QFN | 24 | E | $5.63 | $3.90 | View |
| LTC3736EUF#PBF | QFN | 24 | E | $5.63 | $3.90 | View |
| LTC3736EUF#TR | QFN | 24 | E | $4.00 | View | |
| LTC3736EUF#TRPBF | QFN | 24 | E | $4.00 | View | |
| LTC3736EUF-1 | QFN | 24 | E | $6.43 | $4.50 | View |
| LTC3736EUF-1#PBF | QFN | 24 | E | $6.43 | $4.50 | View |
| LTC3736EUF-1#TR | QFN | 24 | E | $4.60 | View | |
| LTC3736EUF-1#TRPBF | QFN | 24 | E | $4.60 | View | |
| LTC3736EUF-2 | QFN | 24 | E | $5.63 | $3.90 | View |
| LTC3736EUF-2#PBF | QFN | 24 | E | $5.63 | $3.90 | View |
| LTC3736EUF-2#TR | QFN | 24 | E | $4.00 | View | |
| LTC3736EUF-2#TRPBF | QFN | 24 | E | $4.00 | 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 |
|---|---|---|---|
| DC803A | LTC3736EUF-1 | 2-Phase Dual Synchronous Step-Down Converter with Spread Spectrum and Output Tracking, Vin = 2.75V - 8V, Vout1 = 2.5V (5A at 5Vin), Vout2 = 1.8V (5A at 5Vin) | $150.00 | |
| Buy Now | |||
Applications
- One or Two Lithium-Ion Powered Devices
- Notebook and Palmtop Computers, PDAs
- Portable Instruments
- Distributed DC Power Systems
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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.
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To explore other ready to run LTspice demonstration circuits, please visit our Demo Circuits Collection.
Related models available in LTspice IV
LTC3736-1
LTC3736-2
LTC3736
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.
