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Power ManagementSwitching
RegulatorStep-Down
(Buck) RegulatorsMicropower
Buck Regulators
Power
ManagementSwitching
RegulatorStep-Down
(Buck) RegulatorsInternal
Power Switch Buck
Power
ManagementSwitching
RegulatorStep-Down
(Buck) RegulatorsHigh
Input Voltage Buck
Space
& Harsh EnvironmentExtended
Temperature Plastic (H & MP)Extended
Temperature (H & MP) Switching Regulators

Overview

Packaging

Order
Info

Design
Tools

Demo
Boards

Notifications

Tech
Support

LTC4364 - Surge Stopper with
Ideal Diode

LT8609 - 42V, 2A/3A Peak Synchronous Step-Down Regulator with 2.5μA
Quiescent Current

Features

Wide Input Voltage Range: 3.0V to 42V

Ultralow Quiescent Current Burst Mode® Operation:

<2.5μA IQ Regulating 12VIN to
3.3VOUT

Output Ripple <10mVP-P

High Efficiency 2MHz Synchronous Operation:

>93% Efficiency at 1A, 5VOUT from
12VIN

2A Maximum Continuous Output, 3A Peak
Transient Output

Fast Minimum Switch-On Time: 45ns

Adjustable and Synchronizable: 200kHz to 2.2MHz

Spread Spectrum Frequency Modulation for Low EMI

Allows Use of Small Inductors

Low Dropout

Peak Current Mode Operation

Accurate 1V Enable Pin Threshold

Internal Compensation

Output Soft-Start and Tracking

Small 10-Lead MSOP Package

Typical Application

Description

The LT®8609 is a compact, high efficiency, high speed synchronous monolithic
step-down switching regulator that consumes only 1.7μA of quiescent current. The
LT8609 can deliver 2A of continuous current with peak loads of 3A (<1sec) to
support applications such as GSM transceivers which require high transient
loads. Top and bottom power switches are included with all necessary circuitry
to minimize the need for external components. Low ripple Burst Mode operation
enables high efficiency down to very low output currents while keeping the
output ripple below 10mV. A SYNC pin allows synchronization to an external
clock, or spread spectrum modulation of switching frequencies for low EMI
operation. Internal compensation with peak current mode topology allows the use
of small inductors and results in fast transient response and good loop
stability. The EN/UV pin has an accurate 1V threshold and can be used to program
VIN undervoltage lockout or to shut down the LT8609 reducing the
input supply current to 1μA. A capacitor on the TR/SS pin programs the output
voltage ramp rate during start-up while the PG flag signals when VOUT
is within ±8.5% of the programmed output voltage as well as fault conditions.
The LT8609 is available in a small 10-lead MSOP package.

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

MS-10

Order Info

Part numbers ending in PBF are lead
free. Please contact LTC marketing for information on lead based finish
parts.

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

Pins

Temp

Price (1-99)

Price (1k)*

RoHS Data

LT8609EMSE#PBF

MSOP

10

E

$3.57

$2.50

View

LT8609EMSE#TRPBF

MSOP

10

E

$2.56

View

LT8609IMSE#PBF

MSOP

10

I

$3.93

$2.75

View

LT8609IMSE#TRPBF

MSOP

10

I

$2.81

View

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Now • Request
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

DC2195A

LT8609 Demo Board | 5.5V ≤ VIN ≤ 42V, 5Vout at 2A,
FSW=2MHz

Contact
Factory

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Now

Click
here to view our complete list of demo boards

Applications

General Purpose Step Down

Low EMI Step Down

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Product Notifications

Please login to your MyLinear account for notifications of datasheet updates,
new document releases and LTspice model announcements for your favorite
products. If you do not have a MyLinear account you may Sign
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Email Address

Password

Forgot your password? Click here.
Need
help? Email [email-masked] with questions and
comments.

Design Tools

LTspiceIV

LTspice® IV 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 IV

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
IV

Step 2: Once LTspice is installed, click on the link(s)
below to launch the simulation

LT8609 Demo
Circuit - 5V, 2MHz, µPower Step Down (5.5-40V to 5V @ 2A)

Step 3: If LTspice IV 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
IV:
LT8609

Technical Support

For immediate technical assistance, contact
your local sales office or distributor or call 1-800-4-LINEAR (US
customers only) or 408-432-1900.

For less urgent requests, please complete our Technical
Support Request Form. Please allow 2-3 business days for
reply.

Order Now

Order
Now

Request
Samples

Documentation

Datasheet

LT8609
- 42V, 2A/3A Peak Synchronous Step-Down Regulator with 2.5μA Quiescent
Current

Press Release

2A
Synchronous Step-Down DC/DC Converter Delivers 93% Efficiency at 2MHz and
Operates from 3.0V to 42V Inputs

LTspice

LT8609
Demo Circuit - 5V, 2MHz, µPower Step Down (5.5-40V to 5V @
2A)

© 2015 Linear Technology

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