LTC3895
RECOMMENDED FOR NEW DESIGNS150V Low IQ, Synchronous Step-Down DC/DC Controller
- Part Models
- 6
- 1ku List Price
- Starting From $7.10
Overview
- Wide VIN Range: 4V to 140V (150V Abs Max)
- Wide Output Voltage Range: 0.8V to 60V
- Adjustable Gate Drive Level: 5V to 10V (OPTI-DRIVE)
- Low Operating IQ: 40μA (Shutdown = 10μA)
- 100% Duty Cycle Operation
- No External Bootstrap Diode Required
- Selectable Gate Drive UVLO Thresholds
- Onboard LDO or External NMOS LDO for DRVCC
- EXTVCC LDO Powers Drivers from VOUT
- Phase-Lockable Frequency (75kHz to 850kHz)
- Programmable Fixed Frequency (50kHz to 900kHz)
- Selectable Continuous, Pulse-Skipping or Low Ripple Burst Mode® Operation at Light Loads
- Adjustable Burst Clamp and Current Limit
- Adjustable or Fixed (5V/3.3V) Output Voltage
- Power Good Output Voltage Monitor
- Programmable Input Overvoltage Lockout
- 38-Lead TSSOP High Voltage Package
The LTC3895 is a high performance step-down switching regulator DC/DC controller that drives an all N-channel synchronous power MOSFET stage that can operate from input voltages up to 140V. A constant frequency current mode architecture allows a phase-lockable frequency of up to 850kHz.
The gate drive voltage can be programmed from 5V to 10V to allow the use of logic or standard-level FETs to maximize efficiency. An integrated switch in the top gate driver eliminates the need for an external bootstrap diode. An internal charge pump allows for 100% duty cycle operation.
The low 40μA no-load quiescent current extends operating run time in battery-powered systems. OPTI-LOOP® compensation allows the transient response to be optimized over a wide range of output capacitance and ESR values. The LTC3895 features a precision 0.8V reference and power good output indicator. The output voltage can be programmed between 0.8V to 60V using external resistors or pin-programmed for a fixed 5V or 3.3V.
Applications
- Automotive and Industrial Power Systems
- High Voltage Battery Operated Systems
- Telecommunications Power Systems
Documentation
Data Sheet 1
User Guide 1
Technical Articles 2
Video 1
Product Selector Card 2
Brochure 1
Press Release 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 |
|---|---|---|---|
| LTC3895EFE#PBF | 38-Lead TSSOP w/ EP | ||
| LTC3895EFE#TRPBF | 38-Lead TSSOP w/ EP | ||
| LTC3895HFE#PBF | 38-Lead TSSOP w/ EP | ||
| LTC3895HFE#TRPBF | 38-Lead TSSOP w/ EP | ||
| LTC3895IFE#PBF | 38-Lead TSSOP w/ EP | ||
| LTC3895IFE#TRPBF | 38-Lead TSSOP w/ EP |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
May 18, 2026 - 26_0072 Epoxy Change for Select TSSOP Products |
||
| LTC3895EFE#PBF | PRODUCTION | |
| LTC3895EFE#TRPBF | PRODUCTION | |
| LTC3895HFE#PBF | PRODUCTION | |
| LTC3895HFE#TRPBF | PRODUCTION | |
| LTC3895IFE#PBF | PRODUCTION | |
| LTC3895IFE#TRPBF | PRODUCTION | |
|
Apr 14, 2025 - 25_0017 Bond Wire Change from Gold to Copper |
||
| LTC3895EFE#PBF | PRODUCTION | |
| LTC3895EFE#TRPBF | PRODUCTION | |
| LTC3895HFE#PBF | PRODUCTION | |
| LTC3895HFE#TRPBF | PRODUCTION | |
| LTC3895IFE#PBF | PRODUCTION | |
| LTC3895IFE#TRPBF | PRODUCTION | |
|
Apr 6, 2022 - 22_0068 Laser Top Mark for ETSSOP and TSSOP Packages Assembled in ADPG [PNG] and UTL |
||
| LTC3895EFE#PBF | PRODUCTION | |
| LTC3895EFE#TRPBF | PRODUCTION | |
| LTC3895HFE#PBF | PRODUCTION | |
| LTC3895HFE#TRPBF | PRODUCTION | |
| LTC3895IFE#PBF | PRODUCTION | |
| LTC3895IFE#TRPBF | PRODUCTION | |
This is the most up-to-date revision of the Data Sheet.
Software Resources
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Tools & Simulations
LTspice 1
Models for the following parts are available in LTspice:
- LTC3895
LTpowerCAD 3
- LTC3895 Project - Ref. Design Rsense, 100kHz
- LTC3895 Project - High Efficiency High Voltage Buck Converter with Rsense Current Sensing (14-130V to 12V @ 5A)
- LTC3895 Project - High Efficiency High Voltage Buck Converter with DCR Current Sensing (14-130V to 12V @ 5A)
Design tools for the following parts are available in LTpowerCAD:
- LTC3895
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
LTC3895EFE Demo Board | Synchronous Buck, 14V ≤ VIN ≤ 130V, 150VPK; VOUT = 12V @ 5A