LTC3823
PRODUCTIONFast No RSENSE™ Step-Down Synchronous DC/DC Controller with Differential Output Sensing, Tracking and PLL
- Part Models
- 8
- 1ku List Price
- Starting From $4.20
Overview
- Wide VIN Range: 4.5V to 36V
- ±0.67%, 0.6V Reference Voltage
- Output Voltage Tracking Capability
- True Remote Sensing Differential Amplifier
- Sense Resistor Optional
- True Current Mode Control
- 2% to 90% Duty Cycle at 200kHz
- tON(MIN) < 100ns
- Phase-Locked Loop Frequency Synchronization
- Powerful Dual N-Channel MOSFET Driver
- Adjustable Cycle-by-Cycle Current Limit
- Adjustable Switching Frequency
- Programmable Soft-Start
- Current Foldback Protection (Disabled at Start-Up)
- Output Overvoltage Protection
- Micropower Shutdown: 30μA
- Power Good Output Voltage Monitor Tracks the Reference Input Pin
- Available in (5mm × 5mm) 32-Lead QFN and 28-Lead SSOP Narrow Packages
The LTC3823 is a synchronous step-down switching regulator controller with true remote differential output sensing and output voltage up/down tracking capability. Its advanced functions and high accuracy reference are ideal for powering high performance server, ASIC and computer memory systems.
The LTC3823 uses a constant on-time, valley current mode control architecture to deliver very low duty factors without requiring a sense resistor. The operating frequency is selected by an external resistor and is compensated for variations in input supply voltage. An internal phase-locked loop allows the IC to be synchronized to an external clock.
Fault protection is provided by an overvoltage comparator and input undervoltage lockout. The regulator current limit is user programmable. A wide supply range allows voltages as high as 36V to be stepped down to as low as a 0.6V output. When using remote sense, output voltages up to 3.3V can be developed, and up to 90% of VIN without remote sense. Power supply sequencing is accomplished using an external soft-start timing capacitor.
Applications
- Distributed Power Systems
- Server Power Supplies
Documentation
Data Sheet 1
User Guide 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 |
|---|---|---|---|
| LTC3823EGN#PBF | 28-Lead SSOP (Narrow 0.15 Inch) | ||
| LTC3823EGN#TRPBF | 28-Lead SSOP (Narrow 0.15 Inch) | ||
| LTC3823EUH#PBF | 32-Lead QFN (5mm x 5mm x 0.75mm w/ EP) | ||
| LTC3823EUH#TRPBF | 32-Lead QFN (5mm x 5mm x 0.75mm w/ EP) | ||
| LTC3823IGN#PBF | 28-Lead SSOP (Narrow 0.15 Inch) | ||
| LTC3823IGN#TRPBF | 28-Lead SSOP (Narrow 0.15 Inch) | ||
| LTC3823IUH#PBF | 32-Lead QFN (5mm x 5mm x 0.75mm w/ EP) | ||
| LTC3823IUH#TRPBF | 32-Lead QFN (5mm x 5mm 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 |
||
| LTC3823EGN#PBF | PRODUCTION | |
| LTC3823EGN#TRPBF | PRODUCTION | |
| LTC3823IGN#PBF | PRODUCTION | |
| LTC3823IGN#TRPBF | PRODUCTION | |
|
Aug 10, 2022 - 22_0177 Laser Top Mark Conversion for QSOP20_24_28 Assembled in ADPG [PNG] and UTL |
||
| LTC3823EGN#PBF | PRODUCTION | |
| LTC3823EGN#TRPBF | PRODUCTION | |
| LTC3823IGN#PBF | PRODUCTION | |
| LTC3823IGN#TRPBF | PRODUCTION | |
|
Feb 14, 2025 - 25_0016 Bond Wire Change from Gold to Copper Wire (Notification Only) |
||
| LTC3823EUH#PBF | PRODUCTION | |
| LTC3823EUH#TRPBF | PRODUCTION | |
| LTC3823IUH#PBF | PRODUCTION | |
| LTC3823IUH#TRPBF | PRODUCTION | |
|
Jan 20, 2022 - 21_0269 Addition of Alternate Assembly Site ASE Taiwan for Select LFCSP Products |
||
| LTC3823EUH#PBF | PRODUCTION | |
| LTC3823EUH#TRPBF | PRODUCTION | |
| LTC3823IUH#PBF | PRODUCTION | |
| LTC3823IUH#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
| Parts | Product Life Cycle | Description |
|---|---|---|
| Circuit Monitors 1 | ||
| LTC2960 | RECOMMENDED FOR NEW DESIGNS | 36V Nano-Current Two-Input Voltage Monitor |
| Hot Swap Controllers 1 | ||
| LT4363 | RECOMMENDED FOR NEW DESIGNS | High Voltage Surge Stopper with Current Limit |
| Oscillators 1 | ||
| 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 |
Tools & Simulations
LTspice 1
Models for the following parts are available in LTspice:
- LTC3823
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
LTC3823EUH Demo Board | 4.5V ≤ VIN ≤ 16V, VOUT = 2.5V @ 10A
Resources
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