LTC3736
PRODUCTIONDual 2-Phase, No RSENSE™, Synchronous Controller with Output Tracking
- Part Models
- 4
- 1ku List Price
- Starting From $6.34
Overview
- No Current Sense Resistors Required
- Out-of-Phase Controllers Reduce Required Input Capacitance
- Tracking Function
- Wide VIN Range: 2.75V to 9.8V
- Constant Frequency Current Mode Operation
- 0.6V ±1.5% Voltage Reference
- Low Dropout Operation: 100% Duty Cycle
- True PLL for Frequency Locking or Adjustment
- Selectable Burst Mode®/Forced Continuous Operation
- Auxiliary Winding Regulation
- 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 is a 2-phase dual synchronous step-down 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.
Burst Mode operation provides high efficiency at light loads. 100% duty cycle capability provides low dropout operation, extending operating time in battery-powered systems.
The switching frequency can be programmed up to 750kHz, allowing the use of small surface mount inductors and capacitors. For noise sensitive applications, the LTC3736 switching frequency can be externally synchronized from 250kHz to 850kHz. Burst Mode operation is inhibited during synchronization or when the SYNC/FCB pin is pulled low in order to reduce noise and RF interference. Automatic softstart is internally controlled.
The LTC3736 is available in the tiny thermally enhanced (4mm × 4mm) QFN package or 24-lead SSOP narrow package.
Protected by U.S. Patents including 5481178, 5929620, 6144194, 6580258, 6304066, 6611131, 6498466.
| Max Current Sense Voltage | Burst Mode | Soft Start | Spread Spectrum | |
| LTC3736 | 204mV | Yes | No | No |
| LTC3736-1 | 204mV | No | No | Yes |
| LTC3736-2 | 204mV | No | No | Yes |
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
Design Note 3
Technical Articles 2
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#PBF | 24-Lead SSOP (Narrow 0.15 Inch) | ||
| LTC3736EGN#TRPBF | 24-Lead SSOP (Narrow 0.15 Inch) | ||
| LTC3736EUF#PBF | 24-Lead QFN (4mm x 4mm x 0.75mm w/ EP) | ||
| LTC3736EUF#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#PBF | PRODUCTION | |
| LTC3736EGN#TRPBF | PRODUCTION | |
|
Aug 10, 2022 - 22_0177 Laser Top Mark Conversion for QSOP20_24_28 Assembled in ADPG [PNG] and UTL |
||
| LTC3736EGN#PBF | PRODUCTION | |
| LTC3736EGN#TRPBF | PRODUCTION | |
|
Jan 20, 2022 - 21_0269 Addition of Alternate Assembly Site ASE Taiwan for Select LFCSP Products |
||
| LTC3736EUF#PBF | PRODUCTION | |
| LTC3736EUF#TRPBF | PRODUCTION | |
This is the most up-to-date revision of the Data Sheet.
Software Resources
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Request a Driver/SoftwareHardware Ecosystem
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Tools & Simulations
LTspice
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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