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LTC3646HMSE#TRPBF

IC REG BUCK ADJ 1A 16MSOP

Part Number: LTC3646HMSE#TRPBF

Manufacturer: Analog Devices Inc.

Category: Voltage Regulators - DC DC Switching Regulators

Package: 16-TFSOP (0.118", 3.00mm Width) Exposed Pad

Datasheet:: LTC3646HMSE#TRPBF.pdf

Description: IC REG BUCK ADJ 1A 16MSOP

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PRODUCT INFORMATION

Product Details

PRODUCT TECHNICAL REFERENCE

LTC3646HMSE#TRPBF 40V, 1A Synchronous Step-Down Converter with Internal Power FETs

A comprehensive technical overview of the LTC3646HMSE#TRPBF, a high-efficiency synchronous step-down DC/DC converter from Analog Devices featuring a 4.0V to 40V wide input range, 1A guaranteed output current, internal high-side and synchronous power FETs, 140µA typical quiescent current in Burst Mode® operation, adjustable switching frequency from 200kHz to 3MHz, and a thermally enhanced 16-lead MSOP package. Covers device function, core features, electrical specifications, pin configuration, typical applications, and replacement selection guidance.

Analog Devices 16-MSOP-EP (3.00mm × 4.04mm) 4.0V to 40V

Device Classification Synchronous Step-Down DC/DC Converter

Part Number: LTC3646HMSE#TRPBF

Mounting Type: Surface Mount

Operating Temperature Range: -40°C to +150°C

PRODUCT OVERVIEW

What Is the LTC3646HMSE#TRPBF?

LTC3646HMSE#TRPBF is a high-efficiency, step-down DC/DC converter from Analog Devices with internal high-side and synchronous power FETs. The device draws only 140µA typical DC supply current in Burst Mode® operation at no load while maintaining output voltage regulation, making it ideal for always-on and battery-powered applications.

The LTC3646 can supply up to 1A of continuous output current, and its combination of Burst Mode® operation, integrated power switches, and low quiescent current provides high efficiency over a broad range of load currents. Alternatively, it can be used in forced continuous mode for ripple-sensitive applications. The device has a wide 4.0V to 40V input range, and its patented controlled on-time architecture and 0.6V reference voltage allow for large step-down ratios without the risk of output overvoltage.

The switching frequency may be set between 200kHz and 3.0MHz with a program resistor or synchronized to an external clock. Internal soft-start, short-circuit protection, and the high voltage rating make the LTC3646 a robust part ideal for high-voltage automotive and industrial applications.

The LTC3646HMSE#TRPBF is the H-Grade version in a thermally enhanced 16-lead MSOP package with an exposed pad, rated for operation from –40°C to +150°C junction temperature. The device is RoHS compliant (ROHS3), REACH unaffected, and in active production.

Wide 4.0V to 40V Input Range 1A guaranteed output current with output voltage programmable from 2.0V to 30V (LTC3646) or 0.6V to 15V (LTC3646-1).

Low Quiescent Current (140µA) 140µA typical DC supply current in Burst Mode® operation at no load while maintaining output voltage regulation.

Integrated Synchronous Rectification Internal high-side and synchronous power FETs with up to 95% efficiency, internal or external compensation, and adjustable/synchronizable switching frequency from 200kHz to 3MHz.

DEVICE HIGHLIGHTS

Key Features and Benefits of LTC3646HMSE#TRPBF

Wide 4.0V to 40V Input Range

Operates from 4.0V to 40V input, supporting a broad spectrum of automotive, industrial, and high-voltage power sources.

Integrated Synchronous Rectification

Internal high-side and synchronous low-side power FETs deliver up to 95% efficiency, eliminating the need for external Schottky diodes.

Adjustable and Synchronizable Switching Frequency

Switching frequency programmable from 200kHz to 3MHz via an external resistor, or synchronized to an external clock for noise-sensitive applications.

Low Quiescent Current (140µA)

140µA typical DC supply current in Burst Mode® operation at no load, ideal for always-on and battery-powered systems. Selectable forced continuous mode for ripple-sensitive applications.

Internal or External Compensation

Connect the ITH pin to INTVCC to use the default internal compensation, or use external components for optimized loop response.

Robust Protection Features

Internal soft-start, short-circuit protection, and 45V absolute maximum input voltage rating make the LTC3646 ideal for high-voltage applications.

REFERENCE DATA

Technical Specifications for LTC3646HMSE#TRPBF

Part Number	LTC3646HMSE#TRPBF	Manufacturer	Analog Devices
Device Type	Synchronous Step-Down DC/DC Converter	Topology	Buck
Input Voltage Range (V_IN)	4.0V to 40V	Output Voltage Range (V_OUT)	2.0V to 30V (LTC3646)
Output Current (Max)	1A (Guaranteed)	Efficiency (Max)	Up to 95%
Reference Voltage	0.6V ±1%	Quiescent Current (I_Q)	140µA (Typical, Burst Mode®)
Switching Frequency Range	200kHz to 3MHz (Adjustable)	External Synchronization	Yes
Compensation	Internal or External	Soft-Start	Internal
Operating Mode	Burst Mode® or Forced Continuous	Integrated Power Switches	High-Side and Synchronous Low-Side
Protection Features	Short-Circuit Protection, Soft-Start	Absolute Max Input Voltage	45V
Package / Case	16-TFSOP (0.118", 3.00mm Width) Exposed Pad	Supplier Device Package	16-MSOP-EP (MSE16)
Package Body Size	3.00mm × 4.04mm	Pin Count	16
Mounting Type	Surface Mount	Operating Junction Temperature	-40°C to +150°C
RoHS	ROHS3 Compliant	REACH Status	REACH Unaffected
MSL Level	MSL 1 (Unlimited)	ECCN	EAR99
Product Status	Active	Packaging	Tape & Reel (2,500 per Reel)

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.

DESIGN REFERENCE

Circuit Considerations for LTC3646HMSE#TRPBF

Output Voltage, Frequency & Compensation Configuration

The LTC3646HMSE#TRPBF offers flexible programming via external components:

Output Voltage (FB Pin): Connect a resistor divider from V_OUT to FB to program the output voltage using the 0.6V ±1% reference. The LTC3646 supports outputs from 2.0V to 30V.
Switching Frequency (RT Pin): Connect an external resistor between 450k and 30k from RT to SGND to program the switching frequency from 200kHz to 3.0MHz. When RT is connected to INTVCC, the switching frequency is 2.25MHz. Do not float RT.
Compensation (ITH Pin): Connect the ITH pin to INTVCC to use the default internal compensation. For optimized loop response, connect appropriate external RC components to this pin.
Mode Selection (MODE/SYNC Pin): Selects Burst Mode® operation for high efficiency at light loads or forced continuous mode for ripple-sensitive applications. Also used for external synchronization.
Soft-Start: Internal soft-start is provided. The RUN pin enables or disables the device with a precise threshold.

PCB and System-Level Guidance

Buck converter performance depends on layout and component selection:

Input Capacitor: Closely decouple PVIN to PGND with a 10µF or greater, low-ESR capacitor placed close to the device.
INTVCC Capacitor: Decouple the INTVCC pin to PGND with a 4.7µF or greater, low-ESR capacitor.
BOOST Capacitor: Connect a capacitor between the BOOST pin and the SW pin to generate the boosted supply for the high-side gate driver.
Inductor and Output Capacitors: Select based on switching frequency, output current, and ripple requirements using the WEBENCH® Power Designer tool.
Exposed Pad: The exposed thermal pad (EP) must be soldered to the PCB ground plane for optimal thermal performance.
Verify the recommended PCB footprint from the official datasheet prior to production.

16-LEAD MSOP-EP (3.00mm × 4.04mm)

Pin Configuration Reference for LTC3646HMSE#TRPBF

LTC3646

MSOP TOP VIEW

Confirm package orientation and pin numbering against the official package drawing before PCB layout. The MSOP package has 16 pins with a 3.00mm × 4.04mm body size and an exposed thermal pad. The exposed pad must be soldered to the PCB ground plane for optimal thermal performance.

1 SGND Analog Ground - Low Noise Connection to Reference Ground

2 FB Output Voltage Feedback - Connect Resistor Divider to Program V_OUT

3 ITH Error Amplifier Output and Compensation Point - Connect to INTVCC for Internal Compensation

4 RT Oscillator Frequency Program - External Resistor from 450k to 30k to SGND

5 V_ON On-Time Voltage Input - Connect to Regulated Output for On-Time Proportional to V_OUT

6 MODE/SYNC Mode Selection and Synchronization Input

7 PGOOD Power Good Indicator - Open-Drain Output

8 RUN Regulator Enable Pin - High = Enabled, Low = Disabled

9 PVIN Supply Pin for the Power Switch - Connect to Input Supply and Input Bypass Capacitors

10 PVIN Supply Pin for the Power Switch

11 SW Switch Node Output - Connect to Power Inductor and Boost Capacitor

12 BOOST Boosted Supply Pin - Connect Capacitor Between BOOST and SW

13 INTVCC Internal 5.0V Regulator Output - Decouple to PGND with 4.7µF or Greater Low ESR Capacitor

14 EXTVCC External V_CC Input - Use to Power Internal Circuits for Improved Efficiency

15 SVIN Signal Input Supply - Connect to PVIN and Decouple to SGND with 1µF or Greater Capacitor

16 PGND Power Ground - Connect to Source of Low-Side FET Internally

EP PGND Exposed Thermal Pad - Must Be Soldered to PCB Ground Plane for Optimal Thermal Performance

APPLICATION AREAS

Typical Applications for LTC3646HMSE#TRPBF

Automotive Applications

Wide 4.0V to 40V input range and H-Grade temperature operation (–40°C to +150°C) suit automotive point-of-load and intermediate bus power supplies.

Industrial Point-of-Load Power

High efficiency and 1A output current make this converter ideal for point-of-load power supplies in industrial control systems.

Intermediate Bus Power

Wide input range and adjustable frequency support intermediate bus voltage conversion in distributed power architectures.

Telecom & Networking Equipment

Adjustable switching frequency from 200kHz to 3MHz allows placement of switching noise outside critical frequency bands.

Portable Instruments

140µA quiescent current in Burst Mode® operation extends battery life in portable test and measurement equipment.

High-Voltage Battery Systems

Directly steps down from 40V battery stacks and industrial bus voltages without the need for intermediate conversion stages.

REPLACEMENT GUIDANCE

Selecting an Alternative for LTC3646HMSE#TRPBF

A replacement for the LTC3646HMSE#TRPBF should not be selected solely by product category. The electrical characteristics, package, and pin configuration must be evaluated against the specific circuit requirements. The following alternatives are documented in the official Analog Devices product pages and datasheets.

Topology: Synchronous Buck

Input voltage: 4.0V–40V

Output current: 1A

Output voltage: 2.0V–30V

Switching frequency: 200kHz–3MHz

Package: 16-MSOP-EP

Temperature range: –40°C to 150°C

Quiescent current: 140µA (Burst Mode®)

Pin-to-pin and functionally compatible alternatives (same family, different temperature grade or packaging):

Part Number	Package	Temperature Grade	Packaging
LTC3646HMSE#TRPBF	16-MSOP-EP	H-Grade (-40°C to 150°C)	Tape & Reel
LTC3646HMSE#PBF	16-MSOP-EP	H-Grade (-40°C to 150°C)	Tube
LTC3646EMSE#TRPBF	16-MSOP-EP	E-Grade (-40°C to 125°C)	Tape & Reel
LTC3646IMSE#TRPBF	16-MSOP-EP	I-Grade (-40°C to 125°C)	Tape & Reel
LTC3646HDE#TRPBF	14-DFN (4mm × 3mm)	H-Grade (-40°C to 150°C)	Tape & Reel

All alternative part numbers listed above are documented in the official Analog Devices product pages and datasheets. The LTC3646HMSE#TRPBF is the H-Grade (–40°C to 150°C) version in a 16-lead MSOP package with an exposed pad and tape-and-reel packaging (2,500 units per reel). For tube packaging in the same package and grade, consider LTC3646HMSE#PBF. For E-Grade (–40°C to 125°C) operation in the same package, consider LTC3646EMSE#TRPBF. For I-Grade (–40°C to 125°C) operation in the same package, consider LTC3646IMSE#TRPBF. For the 14-lead DFN package option (4mm × 3mm), consider LTC3646HDE#TRPBF. Select based on temperature grade, package, and packaging requirements.

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MANUFACTURER INFORMATION

Analog Devices

The LTC3646 (LTC3646HMSE#TRPBF) belongs to the LTC3646/LTC3646-1 family of high-efficiency, 40V, 1A synchronous step-down converters from Analog Devices (originally Linear Technology). The device features internal high-side and synchronous power FETs, Burst Mode® operation with only 140µA typical quiescent current, and a patented controlled on-time architecture that allows large step-down ratios without the risk of output overvoltage. The LTC3646 is available in 14-lead DFN and thermally enhanced 16-lead MSOP packages, and is designed for point-of-load power, intermediate bus power, and automotive applications. The LTC3646HMSE#TRPBF is the H-Grade version rated for –40°C to +150°C junction temperature operation.

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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: LTC3646HMSE#TRPBF

Manufacturer: Analog Devices Inc.

Package: 16-TFSOP (0.118", 3.00mm Width) Exposed Pad

Series: -

Package/Case: 16-TFSOP (0.118", 3.00mm Width) Exposed Pad

Packaging: Tape & Reel (TR)

Product Status: Active

Function: Step-Down

Output Configuration: Positive

Topology: Buck

Output Type: Adjustable

Number of Outputs: 1

Voltage - Input (Min): 4V

Voltage - Input (Max): 40V

Voltage - Output (Min/Fixed): 2V

Voltage - Output (Max): 30V

Current - Output: 1A

Frequency - Switching: 200kHz ~ 3MHz

Synchronous Rectifier: Yes

Operating Temperature: -40°C ~ 150°C (TJ)

Grade: -

Qualification: -

Mounting Type: Surface Mount

Supplier Device Package: 16-MSOP-EP

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Contact our sales team within the agreed period if there are quantity differences, incorrect items or clear external defects. Products should remain unused and in their original packaging.

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LTC3646HMSE#TRPBF Procurement and Technical Support

LTC3646HMSE#TRPBF 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: LTC3646HMSE#TRPBF

Manufacturer: Analog Devices Inc.

Package: 16-TFSOP (0.118", 3.00mm Width) Exposed Pad

Category: Voltage Regulators - DC DC Switching Regulators

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