LTC3736-1
PRODUCTIONDual 2-Phase, No RSENSE™, Synchronous Controller with Spread Spectrum
- Part Models
- 4
- 1ku List Price
- Starting From $7.37
Overview
- 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
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.
| Max Current Sense Voltage | Burst Mode | Soft Start | Spread Spectrum | |
| LTC3736 | 204mV | Yes | No | No |
| LTC3736-1 | 204mV | No | No | Yes |
| LTC3736-2 | 345mV | No | Yes | No |
Applications
- One or Two Lithium-Ion Powered Devices
- Notebook and Palmtop Computers, PDAs
- Portable Instruments
- Distributed DC Power Systems
Documentation
Data Sheet 1
User Guide 1
Technical Articles 1
Press Release 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 |
|---|---|---|---|
| LTC3736EGN-1#PBF | 24-Lead SSOP (Narrow 0.15 Inch) | ||
| LTC3736EGN-1#TRPBF | 24-Lead SSOP (Narrow 0.15 Inch) | ||
| LTC3736EUF-1#PBF | 24-Lead QFN (4mm x 4mm x 0.75mm w/ EP) | ||
| LTC3736EUF-1#TRPBF | 24-Lead QFN (4mm x 4mm x 0.75mm w/ EP) |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Oct 3, 2024 - 24_0235 (QSOP/SSOP PKG) Migrating Bottom Trace Code Marking to Top Side Laser Marking |
||
| LTC3736EGN-1#PBF | PRODUCTION | |
| LTC3736EGN-1#TRPBF | PRODUCTION | |
|
Aug 10, 2022 - 22_0177 Laser Top Mark Conversion for QSOP20_24_28 Assembled in ADPG [PNG] and UTL |
||
| LTC3736EGN-1#PBF | PRODUCTION | |
| LTC3736EGN-1#TRPBF | PRODUCTION | |
|
Jan 20, 2022 - 21_0269 Addition of Alternate Assembly Site ASE Taiwan for Select LFCSP Products |
||
| LTC3736EUF-1#PBF | PRODUCTION | |
| LTC3736EUF-1#TRPBF | PRODUCTION | |
This is the most up-to-date revision of the Data Sheet.
Software Resources
Can't find the software or driver you need?
Request a Driver/SoftwareHardware Ecosystem
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|---|---|---|
| Oscillators 2 | ||
| LTC6908 | Resistor Set SOT-23 Oscillator with Spread Spectrum Modulation | |
| LTC6909 | PRODUCTION | 1 to 8 Output, Multiphase Silicon Oscillator with Spread Spectrum Modulation |
| Power System Management (PSM) & Sequencers 1 | ||
| LTC2974 | RECOMMENDED FOR NEW DESIGNS | 4-Channel PMBus Power System Manager Featuring Accurate Output Current Measurement |
| Switching Regulators & Controllers 1 | ||
| LTC3880 | RECOMMENDED FOR NEW DESIGNS | Dual Output PolyPhase Step-Down DC/DC Controller with Digital Power System Management |
Tools & Simulations
LTspice 2
- LTC3736-1 - Step-Down (Buck) Regulators
- LTC3736-1 Demo Circuit - Dual 2-Phase No Rsense Synchronous Controller with Spread Spectrum (3.3V to 2.5V @ 3A & 1.8V @ 3A)
Models for the following parts are available in LTspice:
- LTC3736
- LTC3736-1
- LTC3736-2
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.
Evaluation Kits
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