LTC3895 - 150V Low IQ, Synchronous Step-Down DC/DC Controller

Features

  • 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
Designed for Automotive and Transportation Applications
AEC-Q100 data available for specific packages


Typical Application

LTC3895 Typical Application
LTC3895 Typical Application

Description

The LTC®3895 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.

Packaging

CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.

For complete and up to date package information and drawings, please refer to our packaging page

Part Number Package Code Temp Package
Drawing
RoHS
LTC3895EFE#PBF TSSOP-38 FE E 05-08-1865 Yes
LTC3895EFE#TRPBF TSSOP-38 FE E 05-08-1865 Yes
LTC3895HFE#PBF TSSOP-38 FE H 05-08-1865 Yes
LTC3895HFE#TRPBF TSSOP-38 FE H 05-08-1865 Yes
LTC3895IFE#PBF TSSOP-38 FE I 05-08-1865 Yes
LTC3895IFE#TRPBF TSSOP-38 FE I 05-08-1865 Yes


LTC3895 Package Drawing

Order Info

  • Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
  • Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
  • Please refer to our general ordering information or the product datasheet for more details

Package Variations and Pricing

Part Number Package Temp Price
(1-99)
Price
(1k)*
RoHS
LTC3895EFE#PBF TSSOP-38 E $6.71 $4.70 Yes
LTC3895EFE#TRPBF TSSOP-38 E $6.77 $4.76 Yes
LTC3895HFE#PBF TSSOP-38 H $8.00 $5.60 Yes
LTC3895HFE#TRPBF TSSOP-38 H $8.06 $5.66 Yes
LTC3895IFE#PBF TSSOP-38 I $7.57 $5.30 Yes
LTC3895IFE#TRPBF TSSOP-38 I $7.63 $5.36 Yes
Buy NowRequest Samples
* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Demo Boards

Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.

Part Number Description Price Documentation
DC2117A LTC3895EFE Demo Board | Sync Buck, 14V ≤ VIN ≤ 130V, 150V pk; VOUT = 12V @ 5A $225.00
Buy Now
Click here to view our complete list of demo boards

Designed for Automotive and Transportation Applications

AEC-Q100 data is available for these specific part numbers. Please contact your local sales representative for more information regarding reliability reports or to inquire about parts that are not included. For more information, view our Automotive and Transportation page

Part Number Package Temp Price
(1-99)
Price
(1k)*
RoHS
LTC3895EFE#PBF TSSOP-38 E $6.71 $4.70 Yes
LTC3895EFE#TRPBF TSSOP-38 E $6.77 $4.76 Yes
LTC3895HFE#PBF TSSOP-38 H $8.00 $5.60 Yes
LTC3895HFE#TRPBF TSSOP-38 H $8.06 $5.66 Yes
LTC3895IFE#PBF TSSOP-38 I $7.57 $5.30 Yes
LTC3895IFE#TRPBF TSSOP-38 I $7.63 $5.36 Yes
Buy NowRequest Samples
* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Applications

  • Automotive and Industrial Power Systems
  • High Voltage Battery Operated Systems
  • Telecommunications Power Systems

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Design Tools

LTspice

LTspice® software is a powerful, fast and free simulation tool, schematic capture and waveform viewer with enhancements and models for improving the simulation of switching regulators. Click here to download LTspice

To launch a ready to run LTspice demonstration circuit for this part:

  • Step 1: If you have not installed LTspice on this computer, download and install LTspice
  • Step 2: Once LTspice is installed, click on the link(s) below to launch the simulation
  • Step 3: If LTspice does not automatically open after clicking the link above, you can instead run the simulation by right clicking on the link and selecting "Save Target As." After saving the file to your computer, start LTspice and open the demonstration circuit by selecting 'Open' from the 'File' menu

To explore other ready to run LTspice demonstration circuits, please visit our Demo Circuits Collection.

Models for the following parts are available in LTspice:
LTC3895

LTpowerCAD

The LTpowerCAD design tool is a complete power supply design tool program that can significantly ease the tasks of power supply design. It guides users to a solution, selects power stage components, provides detailed power efficiency, shows quick loop bode plot stability and load transient analysis, and can export a final design to LTspice for simulation. Click here to download LTpowerCAD

Design tools for the following parts are available in LTpowerCAD:
LTC3895
LTC3895 Parallel

Technical Support