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LTC3805EMSE-5#PBF

IC REG CTRLR MULT TOP 10MSOP

Part Number: LTC3805EMSE-5#PBF

Manufacturer: Analog Devices Inc.

Category: DC DC Switching Controllers

Package: 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad

Datasheet:: LTC3805EMSE-5#PBF.pdf

Description: IC REG CTRLR MULT TOP 10MSOP

Select Quantity Stock: 410

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1+	$2.71500	$2.72
10+	$2.07100	$20.71
50+	$1.81380	$90.69
100+	$1.73410	$173.41
250+	$1.64992	$412.48
500+	$1.59918	$799.59
1000+	$1.55743	$1557.43
2500+	$1.51336	$3783.40

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PRODUCT INFORMATION

Product Details

PRODUCT TECHNICAL REFERENCE

LTC3805EMSE-5#PBF Adjustable Frequency Current Mode Flyback/Boost/SEPIC DC/DC Controller

A comprehensive technical overview of the LTC3805EMSE-5#PBF, an adjustable frequency current mode DC/DC controller from Analog Devices designed to drive an N-channel MOSFET in flyback, boost, and SEPIC converter applications. Covers device function, core features, electrical specifications, 10-lead MSOP package, pin configuration, typical applications, and replacement selection guidance.

Analog Devices 10-Lead MSOP (MSE) with Exposed Pad 3.95V to 9.5V VCC

Device Classification Adjustable Frequency Current Mode DC/DC Controller

Part Number: LTC3805EMSE-5#PBF

Mounting Type: Surface Mount

Operating Temperature Range: -40°C to +85°C (E-Grade)

PRODUCT OVERVIEW

What Is the LTC3805EMSE-5#PBF?

LTC3805EMSE-5#PBF is an adjustable frequency current mode DC/DC controller from Analog Devices designed to drive an N-channel MOSFET in flyback, boost and SEPIC converter applications. The device features VIN and VOUT limited only by external components, providing tremendous design flexibility for high input and output voltage converter applications.[reference:0]

The LTC3805EMSE-5#PBF provides ±1.5% output voltage accuracy and consumes only 360µA of quiescent current during normal operation and only 40µA during micropower startup.[reference:1] Using a 9.5V internal shunt regulator, the LTC3805-5 can be powered from a high VIN through a resistor or directly from a low impedance DC voltage from 4.7V to 8.8V.[reference:2]

Programmable overcurrent sensing protects the converter from overload and short-circuit conditions. Soft-start can be programmed using an external capacitor, and the soft-start capacitor also programs an automatic restart feature.[reference:3] The LTC3805EMSE-5#PBF is available in a 10-lead MSOP package with exposed pad and is rated for the E-Grade temperature range of –40°C to +85°C.[reference:4]

Flexible Topology Support Designed for flyback, boost, and SEPIC converter applications with VIN and VOUT limited only by external components.[reference:5]

Low Power Consumption 360µA quiescent current and 40µA micropower startup current for energy-efficient designs.[reference:6]

Adjustable Frequency Operating frequency programmable from 70kHz to 700kHz with a single external resistor.[reference:7]

DEVICE HIGHLIGHTS

Key Features and Benefits of LTC3805EMSE-5#PBF

Wide Topology Support

Supports flyback, boost, and SEPIC converter applications with VIN and VOUT limited only by external components, providing maximum design flexibility.[reference:8]

Adjustable Operating Frequency

Operating frequency programmable from 70kHz to 700kHz with a single external resistor, allowing optimization of efficiency or component size.[reference:9]

Programmable Overcurrent Protection

Adjustable overcurrent protection with automatic restart protects the converter from overload and short-circuit conditions.[reference:10]

Low Quiescent Current

Consumes only 360µA during normal operation and 40µA during micropower startup, ideal for power-sensitive applications.[reference:11]

Programmable Soft-Start & Restart

Soft-start programmable with one external capacitor; the same capacitor also programs an automatic restart feature for fault recovery.[reference:12]

E-Grade Temperature Range

Rated for –40°C to +85°C operating temperature range with ±1.5% reference accuracy, suitable for industrial and commercial applications.[reference:13][reference:14]

REFERENCE DATA

Technical Specifications for LTC3805EMSE-5#PBF

Part Number	LTC3805EMSE-5#PBF	Manufacturer	Analog Devices
Device Type	Adjustable Frequency Current Mode DC/DC Controller	Topology	Flyback, Boost, SEPIC
VCC Supply Voltage	3.95V to 9.5V	VIN and VOUT	Limited Only by External Components
Switching Frequency	70kHz to 700kHz (Adjustable)	Maximum Duty Cycle	70% to 95%
Reference Accuracy	±1.5%	Current Sense Voltage Drop	100mV
Quiescent Current	360µA (Typical)	Micropower Startup Current	40µA
VCC Turn-On Voltage	4.3V Min, 4.5V Typ, 4.7V Max	VCC Turn-Off Voltage	3.75V Min, 3.95V Typ, 4.15V Max
Internal Shunt Regulator	9.5V	Undervoltage Lockout Threshold (-5 Version)	4.5V
Package	10-Lead MSOP with Exposed Pad (MSE)	Package Body Size	3.00mm × 3.00mm
Mounting Type	Surface Mount	Operating Temperature (E-Grade)	-40°C to +85°C
Storage Temperature Range	-65°C to +150°C	Junction Temperature (Max)	125°C
Thermal Resistance θJA (MSOP)	45°C/W	Moisture Sensitivity Level	MSL 1
RoHS	Yes (Pb-free)	Packaging	Tube (50 per Tube)
Device Marking	LTDGX	Lead Temperature (Soldering)	300°C

Electrical values shown above are reference values. Test conditions, limits, and guaranteed performance should always be confirmed from the current official manufacturer datasheet before design or production use.[reference:15]

DESIGN REFERENCE

Circuit Considerations for LTC3805EMSE-5#PBF

Configuration & Operation

The LTC3805EMSE-5#PBF offers flexible configuration for various converter topologies:

Topology Support: Flyback, boost, and SEPIC converter applications[reference:16]
Frequency Setting: Adjustable operating frequency from 70kHz to 700kHz with one external resistor[reference:17]
Slope Compensation: Adjustable slope compensation programmable by external resistor[reference:18]
Current Sensing: Programmable overcurrent sensing with only 100mV current sense voltage drop[reference:19]
Soft-Start: Programmable soft-start with one external capacitor; also programs automatic restart[reference:20]
RUN Pin: Precision threshold with adjustable hysteresis for enabling/disabling the device[reference:21]
External Clock Synchronization: Synchronizable to an external clock (70kHz to 700kHz) for noise-sensitive applications[reference:22]

PCB and Power-Supply Guidance

DC/DC controller performance depends on layout, bypassing, and component selection:

VCC Supply: Powered from a high VIN through a resistor using the 9.5V internal shunt regulator, or directly from a low impedance DC voltage from 4.7V to 8.8V[reference:23]
Bypass Capacitor: Place a bypass capacitor close to the VCC and GND pins
Sense Resistor: Place the current sense resistor close to the ISENSE pin for accurate current sensing
Ground Plane: Use a solid ground plane for optimal noise performance
Exposed Pad: The exposed pad (Pin 11) is GND and must be soldered to the PCB for proper thermal and electrical performance[reference:24]
Frequency Setting: Use precision resistors for accurate frequency programming
Verify the recommended PCB footprint from the official datasheet before production

10-LEAD MSOP (MSE)

Pin Configuration Reference for LTC3805EMSE-5#PBF

LTC3805

MSOP (MSE) TOP VIEW

Confirm package orientation and pin numbering against the official package drawing before PCB layout. The MSE package has 10 pins with exposed pad (Pin 11) connected to GND.[reference:25]

1 SSFLT Soft-Start / Fault Timer - Capacitor to ground sets soft-start and restart timing[reference:26]

2 ITH Error Amplifier Output / Compensation Pin[reference:27]

3 FB Feedback Input - Connect to external resistor divider for output voltage setting[reference:28]

4 RUN Enable Input - Precision threshold with hysteresis; high enables device[reference:29]

5 FS Frequency Set - Resistor to ground sets switching frequency[reference:30]

6 SYNC External Clock Synchronization Input[reference:31]

7 ISENSE Current Sense Input - Monitors switch current and injects slope compensation[reference:32]

8 OC Overcurrent Protection Threshold Set[reference:33]

9 VCC Supply Pin - 3.95V to 9.5V; decouple to GND[reference:34]

10 GATE Gate Drive Output - Drives external N-channel MOSFET[reference:35]

APPLICATION AREAS

Typical Applications for LTC3805EMSE-5#PBF

Automotive Power Supplies

Power conversion for automotive applications.[reference:36]

Telecom Power Supplies

Power conversion for telecommunications infrastructure equipment.[reference:37]

Isolated Electronic Equipment

Isolated power supplies for industrial and medical equipment.[reference:38]

Auxiliary/Housekeeping Power Supplies

Low-power housekeeping supplies for larger systems.[reference:39]

Power over Ethernet (PoE)

Power conversion for PoE applications.[reference:40]

Industrial Power Conversion

Flyback, boost, and SEPIC converters for industrial applications.

REPLACEMENT GUIDANCE

Selecting an Alternative for LTC3805EMSE-5#PBF

A replacement for the LTC3805EMSE-5#PBF should not be selected only by product category. The electrical characteristics, package, and pin configuration must be evaluated against the actual circuit requirements.

VCC supply voltage range (3.95V–9.5V)

Switching frequency range (70kHz–700kHz)

Reference accuracy (±1.5%)

Quiescent current (360µA)

Topology support (Flyback, Boost, SEPIC)

Package (10-lead MSOP with exposed pad)

Temperature range (–40°C to +85°C)

Synchronizable to external clock

Family alternatives: LTC3805EMSE-5#TRPBF (E-Grade, –40°C to 85°C, tape and reel), LTC3805IMSE-5#PBF (I-Grade, –40°C to 125°C, tube), LTC3805IMSE-5#TRPBF (I-Grade, –40°C to 125°C, tape and reel), LTC3805HMSE-5#PBF (H-Grade, –40°C to 150°C, tube), LTC3805HMSE-5#TRPBF (H-Grade, –40°C to 150°C, tape and reel), LTC3805MPMSE-5#PBF (MP-Grade, –55°C to 150°C, tube), LTC3805MPMSE-5#TRPBF (MP-Grade, –55°C to 150°C, tape and reel), LTC3805EDD-5#PBF (DFN package, 3mm × 3mm, E-Grade).[reference:41] The LTC3805-5 variant features a lower 4.5V undervoltage lockout threshold compared to the standard LTC3805.[reference:42] Select based on temperature range, package, and packaging needs.

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MANUFACTURER INFORMATION

Analog Devices

The LTC3805-5 (LTC3805EMSE-5#PBF) belongs to the adjustable frequency current mode DC/DC controller portfolio of Analog Devices. The device is designed for flyback, boost, and SEPIC converter applications with VIN and VOUT limited only by external components.[reference:43] The LTC3805-5 variant features a lower 4.5V undervoltage lockout threshold compared to the standard LTC3805.[reference:44]

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Haishengye Electronics provides electronic component stock supply, BOM sourcing, quotation support, and quality inspection services for LTC3805EMSE-5#PBF and related devices.

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Technical Information Disclaimer

This technical guide is provided for product identification and preliminary reference only. Electrical limits, package dimensions, pin configuration, product status, and application suitability must be verified using current official manufacturer documentation before design, procurement, or production.

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Specifications

Product Attribute: Attribute Value

Part Number: LTC3805EMSE-5#PBF

Manufacturer: Analog Devices Inc.

Package: 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad

Series: -

Package/Case: 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad

Packaging: Tube

Product Status: Active

Output Type: Transistor Driver

Function: Step-Up, Step-Up/Step-Down

Output Configuration: Positive, Isolation Capable

Topology: Boost, Flyback, SEPIC

Number of Outputs: 1

Output Phases: 1

Voltage - Supply (Vcc/Vdd): 3.95V ~ 9.5V

Frequency - Switching: 70kHz ~ 700kHz

Duty Cycle (Max): 80%

Synchronous Rectifier: No

Clock Sync: Yes

Serial Interfaces: -

Control Features: Enable, Soft Start

Operating Temperature: -40°C ~ 85°C (TA)

Grade: -

Qualification: -

Mounting Type: Surface Mount

Supplier Device Package: 10-MSOP-EP

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LTC3805EMSE-5#PBF Procurement and Technical Support

LTC3805EMSE-5#PBF is manufactured by Analog Devices Inc.. This page provides purchasing information including manufacturer, category, package, datasheet, stock reference, price reference and product specifications.

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Part Number: LTC3805EMSE-5#PBF

Manufacturer: Analog Devices Inc.

Package: 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad

Category: DC DC Switching Controllers

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