LTC3852
RECOMMENDED FOR NEW DESIGNSLow Input Voltage, Synchronous Step-Down DC/DC Controller
- Part Models
- 4
- 1ku List Price
- Starting From $2.99
Overview
- Charge Pump Input Range: 2.7V to 5.5V
- Controller Input Range: 4V to 38V
- Integrated Charge Pump Provides 5V Gate Drive to Logic Level MOSFETs
- RSENSE or DCR Current Sensing
- ±1.25% Output Voltage Accuracy Over Temperature
- Phase-Lockable Fixed Frequency: 250kHz to 750kHz
- Power Good Output Voltage Monitor
- Adjustable Soft-Start Voltage Ramping
- Current Foldback Disabled During Start-Up
- No Reverse Current During Soft-Start
- Selectable Constant Frequency, Pulse-Skipping, or Burst Mode Operation
- Output Overvoltage Protection
- Very Low Dropout Operation: 99% Duty Cycle
- Available in a 24-Lead (3mm × 5mm) QFN Package
The LTC3852 is a constant frequency, current mode step-down DC/DC controller which can be powered by an on-board charge pump. Input supplies as low as 2.7V, when doubled by the charge pump, provide 5V to the LTC3852’s control logic and gate drives, supporting a wide selection of logic-level N-channel power MOSFETs.
The constant-frequency current mode architecture allows for a phase-lockable fixed frequency of up to 750kHz. The RUN pin provides a precision enable threshold while the TRACK/SS pin combines tracking and adjustable soft-start features.
The MODE/PLLIN pin selects among Burst Mode® operation, pulse-skipping mode, and continuous current mode. Current foldback limits MOSFET power dissipation during short-circuit conditions. Reverse current and current foldback functions are disabled during soft-start. A power good output pin indicates when the output is within ±10% of its designed set point.
Applications
- General Purpose 3.3V Systems
- Lithium-Ion Powered Devices
- Distributed DC Power Systems
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 |
|---|---|---|---|
| LTC3852EUDD#PBF | 24-Lead QFN (3mm x 5mm x 0.75mm w/ EP) | ||
| LTC3852EUDD#TRPBF | 24-Lead QFN (3mm x 5mm x 0.75mm w/ EP) | ||
| LTC3852IUDD#PBF | 24-Lead QFN (3mm x 5mm x 0.75mm w/ EP) | ||
| LTC3852IUDD#TRPBF | 24-Lead QFN (3mm x 5mm x 0.75mm w/ EP) |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Nov 8, 2021 - 20_0245 Notification of Wafer Fab Location Change for 0.6µm BICMOS Process Devices from ADI Milpitas (Hillview) to Vanguard Int. (Taiwan) |
||
| LTC3852EUDD#PBF | PRODUCTION | |
| LTC3852EUDD#TRPBF | PRODUCTION | |
| LTC3852IUDD#PBF | PRODUCTION | |
| LTC3852IUDD#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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| 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 1
Models for the following parts are available in LTspice:
- LTC3852
LTpowerCAD 1
Design tools for the following parts are available in LTpowerCAD:
- LTC3852
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.
LTpowerCAD® is a power supply design program which selects power stage components, provides detailed power efficiency, shows quick loop Bode plot stability and load transient analysis, and can export to LTspice for simulation.
Evaluation Kits
LTC3852EUDD Demo Board | 2.7V ≤ VIN ≤ 5.5V, VOUT = 1.5V @ 15A
Resources
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