LTC3853
PRODUCTIONTriple Output, Multiphase Synchronous Step-Down Controller
- Part Models
- 8
- 1ku List Price
- Starting From $5.35
Overview
- Triple, 120° Phased Controllers Reduce Required Input Capacitance and Power Supply Induced Noise
- Configurable as a 180° Dual Phase Controller Plus a Single Phase Controller
- The Third Phase Can Regulate Up to a 13.5V Output
- High Efficiency: Up to 92%
- RSENSE or DCR Current Sensing
- ±0.75% 0.8V Output Voltage Accuracy
- Phase-Lockable Fixed Frequency 250kHz to 750kHz
- Supports Pre-Biased Outputs
- Dual N-Channel MOSFET Synchronous Drive
- Wide VIN Range: 4.5V to 24V Operation (28V Abs Max)
- Adjustable Soft-Start Current Ramping or Tracking
- Foldback Output Current Limiting
- Output Overvoltage Protection
- Dual Power Good Output Voltage Monitors
- 40-Lead 6mm × 6mm QFN Package
The LTC3853 is a high performance triple output stepdown switching regulator controller that drives all Nchannel synchronous power MOSFET stages. Power loss and supply noise are minimized by operating the output stages out of phase. The part can be configured as a dual phase controller plus a single phase controller if needed. The part can also be configured to provide a single 3-phase output for even higher output currents.
A wide 4.5V to 24V (28V maximum) input voltage supply range encompasses most battery chemistries and intermediate bus voltages. Phase 3 can regulate output voltages up to 13.5V. A constant-frequency current mode architecture allows for a phase-lockable frequency up to 750kHz.
Independent TK/SS pins for each output ramps the output voltages and can be configured for coincident or ratiometric tracking. Current foldback limits MOSFET heat dissipation during short-circuit conditions. The MODE/PLLIN pin selects among Burst Mode® operation, pulse-skipping or continuous inductor current modes.
Documentation
Data Sheet 1
User Guide 2
Technical Articles 1
Video 1
LT Journal 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 |
|---|---|---|---|
| LTC3853EUJ#PBF | 40-Lead QFN (6mm x 6mm x 0.75mm w/ EP) | ||
| LTC3853EUJ#TRPBF | 40-Lead QFN (6mm x 6mm x 0.75mm w/ EP) | ||
| LTC3853HUJ#PBF | 40-Lead QFN (6mm x 6mm x 0.75mm w/ EP) | ||
| LTC3853HUJ#TRPBF | 40-Lead QFN (6mm x 6mm x 0.75mm w/ EP) | ||
| LTC3853IUJ#PBF | 40-Lead QFN (6mm x 6mm x 0.75mm w/ EP) | ||
| LTC3853IUJ#TRPBF | 40-Lead QFN (6mm x 6mm x 0.75mm w/ EP) | ||
| LTC3853MPUJ#PBF | 40-Lead QFN (6mm x 6mm x 0.75mm w/ EP) | ||
| LTC3853MPUJ#TRPBF | 40-Lead QFN (6mm x 6mm x 0.75mm w/ EP) |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Feb 14, 2025 - 25_0017 Bond Wire Change from Gold to Copper |
||
| LTC3853EUJ#PBF | PRODUCTION | |
| LTC3853EUJ#TRPBF | PRODUCTION | |
| LTC3853HUJ#PBF | PRODUCTION | |
| LTC3853HUJ#TRPBF | PRODUCTION | |
| LTC3853IUJ#PBF | PRODUCTION | |
| LTC3853IUJ#TRPBF | PRODUCTION | |
|
Jul 28, 2021 - 20_0245 Notification of Wafer Fab Location Change for 0.6µm BICMOS Process Devices from ADI Milpitas (Hillview) to Vanguard Int. (Taiwan) |
||
| LTC3853EUJ#PBF | PRODUCTION | |
| LTC3853EUJ#TRPBF | PRODUCTION | |
| LTC3853HUJ#PBF | PRODUCTION | |
| LTC3853HUJ#TRPBF | PRODUCTION | |
| LTC3853IUJ#PBF | PRODUCTION | |
| LTC3853IUJ#TRPBF | PRODUCTION | |
| LTC3853MPUJ#PBF | PRODUCTION | |
| LTC3853MPUJ#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
| 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:
- LTC3853
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
Reference Designs
Part Used
