LT3840
RECOMMENDED FOR NEW DESIGNSWide Input Range Synchronous Regulator Controller with Accurate Current Limit
- Part Models
- 12
- 1ku List Price
- Starting From $5.54
Overview
- Wide Input Range: 2.5V to 60V
- Integrated Buck-Boost Supply for 7.5V MOSFET Gate Drive
- Programmable Constant-Current Operation with Current Monitor Output
- Low IQ: 75μA, 12VIN to 3.3VOUT
- Selectable Low Output Ripple Burst Mode® Operation
- VOUT Up to 60V
- Adjustable and Synchronizable: 50kHz to 1MHz
- Internal OVLO Protects for Input Transients Up to 80V
- Accurate Input Overvoltage and Undervoltage Threshold
- Programmable Soft-Start with Voltage Tracking
- Power Good and Output OVP
- 28-Lead TSSOP and 38-Lead 4mm × 6mm QFN Packages
The LT3840 is a high voltage synchronous step-down switching regulator controller capable of operating from a 2.5V to 60V supply.
The LT3840’s low quiescent current, when configured for user selectable Burst Mode operation, helps extend run time in battery-powered systems by increasing efficiency at light loads. The LT3840 uses a constant frequency, current mode architecture. High current applications are possible with large N-channel gate drivers capable of driving multiple low RDS(ON) MOSFETs.
An integrated buck-boost switching regulator generates a 7.5V bias supply voltage for MOSFET gate drive and IC power allowing higher efficiency operation over the entire input voltage range and eliminating the need for an external bias voltage. An accurate current limit set point regulates the maximum output current. A current monitor reports the average output current.
Applications
- Automotive Supplies
- Industrial Systems
- 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 |
|---|---|---|---|
| LT3840EFE#PBF | 28-Lead TSSOP w/ EP | ||
| LT3840EFE#TRPBF | 28-Lead TSSOP w/ EP | ||
| LT3840EUFE#PBF | 38-Lead QFN (4mm x 6mm x 0.75mm w/ EP) | ||
| LT3840EUFE#TRPBF | 38-Lead QFN (4mm x 6mm x 0.75mm w/ EP) | ||
| LT3840HFE#PBF | 28-Lead TSSOP w/ EP | ||
| LT3840HFE#TRPBF | 28-Lead TSSOP w/ EP | ||
| LT3840IFE#PBF | 28-Lead TSSOP w/ EP | ||
| LT3840IFE#TRPBF | 28-Lead TSSOP w/ EP | ||
| LT3840IUFE#PBF | 38-Lead QFN (4mm x 6mm x 0.75mm w/ EP) | ||
| LT3840IUFE#TRPBF | 38-Lead QFN (4mm x 6mm x 0.75mm w/ EP) | ||
| LT3840MPFE#PBF | 28-Lead TSSOP w/ EP | ||
| LT3840MPFE#TRPBF | 28-Lead TSSOP w/ EP |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Feb 14, 2025 - 25_0016 Bond Wire Change from Gold to Copper Wire (Notification Only) |
||
| LT3840EFE#PBF | PRODUCTION | |
| LT3840EFE#TRPBF | PRODUCTION | |
| LT3840HFE#PBF | PRODUCTION | |
| LT3840HFE#TRPBF | PRODUCTION | |
| LT3840IFE#PBF | PRODUCTION | |
| LT3840IFE#TRPBF | PRODUCTION | |
| LT3840IUFE#PBF | PRODUCTION | |
| LT3840IUFE#TRPBF | PRODUCTION | |
|
Apr 6, 2022 - 22_0068 Laser Top Mark for ETSSOP and TSSOP Packages Assembled in ADPG [PNG] and UTL |
||
| LT3840EFE#PBF | PRODUCTION | |
| LT3840EFE#TRPBF | PRODUCTION | |
| LT3840HFE#PBF | PRODUCTION | |
| LT3840HFE#TRPBF | PRODUCTION | |
| LT3840IFE#PBF | PRODUCTION | |
| LT3840IFE#TRPBF | PRODUCTION | |
| LT3840MPFE#PBF | PRODUCTION | |
| LT3840MPFE#TRPBF | PRODUCTION | |
|
Apr 9, 2025 - 25_0016 Bond Wire Change from Gold to Copper Wire (Notification Only) |
||
| LT3840EUFE#PBF | PRODUCTION | |
| LT3840EUFE#TRPBF | PRODUCTION | |
|
May 18, 2026 - 26_0072 Epoxy Change for Select TSSOP Products |
||
| LT3840MPFE#PBF | PRODUCTION | |
| LT3840MPFE#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 |
|---|---|---|
| Hot Swap Controllers 1 | ||
| LT4363 | RECOMMENDED FOR NEW DESIGNS | High Voltage Surge Stopper with Current Limit |
Tools & Simulations
LTspice 1
Models for the following parts are available in LTspice:
- LT3840
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
LT3840EFE Demo Board | 4.5V ≤ VIN ≤ 60V, 80V Transients, VOUT = 3.3V @ 20A