Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Regulators - DC DC Switching Regulators

Analog Devices Inc. LTC3406B-2ES5#TRPBF

Name: LTC3406B-2ES5#TRPBF
Brand: Analog Devices Inc.
SKU: LTC3406B-2ES5#TRPBF
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: LTC3406B-2ES5#TRPBF

Manufacturer:: Analog Devices Inc.

Category:: Voltage Regulators - DC DC Switching Regulators

Package:: SOT-23-5 Thin, TSOT-23-5

Datasheet:: LTC3406B-2ES5#TRPBF.pdf

Description:: IC REG BUCK ADJ 600MA TSOT23-5

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:3,831

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

LTC3406B-2ES5#TRPBF from Analog Devices (formerly Linear Technology) is a high-efficiency monolithic synchronous step-down DC/DC regulator using constant-frequency current-mode control. It delivers up to 600mA output current from a 2.5V–5.5V input, features 2.25MHz switching, 0.6V reference for low-output-voltage designs, and 100% duty-cycle operation for ultra-low dropout-ideal for single Li-Ion battery-powered portable electronics.

For engineers reviewing the LTC3406B-2ES5#TRPBF datasheet, LTC3406B-2ES5#TRPBF pinout, LTC3406B-2ES5#TRPBF application, or LTC3406B-2ES5#TRPBF equivalent, key selection criteria include its 2.25MHz fixed-frequency operation enabling compact 2.2µH inductors, integrated P/N-channel MOSFETs eliminating external Schottky diodes, and thermal-limited 125°C junction temperature in the TSOT-23-5 package.

Technical Context

The LTC3406B-2ES5#TRPBF employs a constant-frequency, current-mode architecture with internal slope compensation to prevent subharmonic oscillation at high duty cycles. Its dual internal MOSFETs-a 0.4Ω typical R_DS(ON) P-channel main switch and 0.4Ω typical R_DS(ON) N-channel synchronous switch-enable high efficiency without external diodes.

It operates in pulse-skipping mode at light loads to maintain regulation while minimizing quiescent current (350µA no-load, <1µA shutdown), and includes overtemperature protection, overvoltage lockout (20–80mV above V_FB), and frequency foldback during short-circuit conditions (reducing f_OSC to ~310kHz).

Key Specifications

Parameter	Value and Actual Design Meaning
Input Voltage Range	2.5V to 5.5V - supports full discharge range of single Li-Ion (2.7V–4.2V) and 5V rail applications.
Output Current	600mA continuous - sufficient for core logic, RF transceivers, and sensor subsystems in portable devices.
Switching Frequency	2.25MHz (typ) - enables use of tiny 2.2µH surface-mount inductors and low-ESR ceramic capacitors.
Feedback Reference	0.6V ±1.5% - allows precise programming of output voltages as low as 0.6V (e.g., 1.2V, 1.5V, 1.8V, 2.5V, 3.3V).
Quiescent Current	350µA (no load), <1µA (shutdown) - extends battery runtime in standby and sleep modes.
Duty Cycle Range	0% to 100% - supports true low-dropout operation when input approaches output voltage.
Thermal Limit	Junction temperature max 125°C - protected by internal overtemperature circuitry; θ_JA = 250°C/W in TSOT-23-5.

Pinout & Package

Package: 5-lead ThinSOT™ (TSOT-23-5), 1mm profile, RoHS-compliant, moisture-sensitive level 1.

Pin/Terminal	Circuit Role	Design Meaning
RUN (Pin 1)	Enable/Shutdown Control	Logic-level input: >1.5V enables regulation; <0.3V forces shutdown (<1µA I_Q); must not be left floating.
GND (Pin 2)	Power Ground Reference	Primary return path for VIN, SW, and feedback network; requires low-inductance connection to PCB ground plane.
SW (Pin 3)	Switch Node	Connection point between internal P- and N-channel MOSFET drains; carries high di/dt square-wave current-requires short, wide trace routing.
VIN (Pin 4)	Main Input Supply	Connects to input capacitor (≥4.7µF ceramic); decoupling must be placed adjacent to this pin to minimize AC loop area.
VFB (Pin 5)	Feedback Input	High-impedance node (±30nA bias) sensing resistive divider output; sensitive to noise-must be routed away from SW and VIN traces.

Key Features

Feature	Design Value
Synchronous Buck Architecture	Integrated P- and N-channel MOSFETs eliminate external Schottky diode, reducing BOM count and improving efficiency across load range.
2.25MHz Fixed Switching	Enables miniature passive components: 2.2µH inductor + 10µF ceramic output cap achieve <10mV ripple at 600mA.
100% Duty-Cycle Operation	Maintains regulation down to V_IN ≈ V_OUT + I_LOAD × R_DS(ON), extending usable battery life in deep-discharge states.
Pulse-Skipping Light-Load Mode	Reduces switching losses at low I_LOAD, sustaining >85% efficiency even at 1mA output current.
Robust Protection Suite	Includes overtemperature shutdown, overvoltage lockout (20–80mV above V_FB), and short-circuit frequency foldback (~310kHz).

Applications

Cellular Telephones	Digital Still Cameras
Use Scenario: Powering baseband processor and RF transceiver from single Li-Ion cell (2.7V–4.2V) with dynamic load steps up to 600mA. IC Role / Device Role / Timing Role: Primary buck regulator delivering stable 1.2V/1.8V core and I/O rails with fast transient response (<20µs recovery). Use Value: 96% peak efficiency and 350µA quiescent current maximize talk time and standby duration.	Use Scenario: Supplying image sensor, ISP, and flash LED driver in compact camera modules where board space is constrained. IC Role / Device Role / Timing Role: High-frequency synchronous buck converter generating 2.5V/3.3V rails with minimal EMI due to fixed 2.25MHz operation. Use Value: TSOT-23-5 footprint and compatibility with 2.2µH inductors reduce solution size by >40% vs legacy 500kHz regulators.
Wireless Modems	Portable Instruments
Use Scenario: Regulating power for LTE/Wi-Fi SoC and memory in always-connected IoT gateways operating on Li-Poly batteries. IC Role / Device Role / Timing Role: Efficient 5V-to-3.3V conversion with low-noise pulse-skipping mode during idle periods. Use Value: <1µA shutdown current and programmable RUN pin enable rapid wake-up from deep-sleep states without external enable sequencing.	Use Scenario: Providing precision analog supply (e.g., 1.8V for ADC/DAC) in handheld test equipment with variable battery voltage. IC Role / Device Role / Timing Role: Low-drift 0.6V reference and tight line/load regulation (±0.5%) ensure stable reference for signal chain components. Use Value: ±1.5% V_FB tolerance and <0.4%/V line regulation minimize output deviation across full input range (2.5V–5.5V).

Cellular Telephones

Digital Still Cameras

Use Scenario: Powering baseband processor and RF transceiver from single Li-Ion cell (2.7V–4.2V) with dynamic load steps up to 600mA.

IC Role / Device Role / Timing Role: Primary buck regulator delivering stable 1.2V/1.8V core and I/O rails with fast transient response (<20µs recovery).

Use Value: 96% peak efficiency and 350µA quiescent current maximize talk time and standby duration.

Use Scenario: Supplying image sensor, ISP, and flash LED driver in compact camera modules where board space is constrained.

IC Role / Device Role / Timing Role: High-frequency synchronous buck converter generating 2.5V/3.3V rails with minimal EMI due to fixed 2.25MHz operation.

Use Value: TSOT-23-5 footprint and compatibility with 2.2µH inductors reduce solution size by >40% vs legacy 500kHz regulators.

Wireless Modems

Portable Instruments

Use Scenario: Regulating power for LTE/Wi-Fi SoC and memory in always-connected IoT gateways operating on Li-Poly batteries.

IC Role / Device Role / Timing Role: Efficient 5V-to-3.3V conversion with low-noise pulse-skipping mode during idle periods.

Use Value: <1µA shutdown current and programmable RUN pin enable rapid wake-up from deep-sleep states without external enable sequencing.

Use Scenario: Providing precision analog supply (e.g., 1.8V for ADC/DAC) in handheld test equipment with variable battery voltage.

IC Role / Device Role / Timing Role: Low-drift 0.6V reference and tight line/load regulation (±0.5%) ensure stable reference for signal chain components.

Use Value: ±1.5% V_FB tolerance and <0.4%/V line regulation minimize output deviation across full input range (2.5V–5.5V).

Equivalent & Alternatives

The following parts are listed as comparable options for similar synchronous step-down regulator applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
TPS62231DRVR	2.25MHz fixed frequency, 600mA, 0.6V reference, but uses external compensation and lacks 100% duty cycle.	Requires additional RC network for loop stability; less suitable for ultra-low-V_IN dropout scenarios.	Prefer LTC3406B-2ES5#TRPBF when 100% duty cycle or integrated compensation is required.
MAX17222ETA+	1.2MHz switching, 500mA, 0.6V reference, integrated soft-start, but higher quiescent current (60µA active, 0.5µA shutdown).	Better suited for cost-sensitive, lower-frequency designs where 2.25MHz EMI filtering is impractical.	Prefer LTC3406B-2ES5#TRPBF when high-frequency operation and lowest possible I_Q in shutdown are critical.

Compared with TPS62231DRVR and MAX17222ETA+, the LTC3406B-2ES5#TRPBF uniquely combines 2.25MHz operation, 100% duty cycle, and sub-1µA shutdown current in a 5-pin TSOT-23, making it optimal for space-constrained, battery-critical Li-Ion systems requiring both high efficiency and deep dropout capability.

Availability

LTC3406B-2ES5#TRPBF is available at Aetrix Electronics and suitable for cellular telephones, digital still cameras, wireless modems, and portable instruments requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant sourcing.

Supply support for LTC3406B-2ES5#TRPBF includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Analog Devices acquired Linear Technology in 2017 and maintains full technical and manufacturing continuity for all Linear power products.

The LTC3406B-2ES5#TRPBF belongs to Linear's high-frequency synchronous buck regulator family, designed specifically for portable Li-Ion applications demanding small size, high efficiency across wide load ranges, and robust thermal performance in thin-profile packages.

FAQ

What is the maximum output current capability of the LTC3406B-2ES5#TRPBF?

The LTC3406B-2ES5#TRPBF delivers up to 600mA continuous output current under typical conditions (e.g., V_IN = 3.6V, V_OUT = 1.8V, T_A = 25°C). Maximum current decreases at low input voltages (e.g., 2.5V) due to increased R_DS(ON) and thermal limits; Figure 2 in the datasheet shows derating curves for V_OUT = 1.2V/1.5V/2.5V across the 2.5V–5.5V input range. The LTC3406B-2ES5#TRPBF remains functional at 100% duty cycle but requires thermal analysis when operating near dropout.

Does the LTC3406B-2ES5#TRPBF require an external Schottky diode?

No, the LTC3406B-2ES5#TRPBF does not require an external Schottky diode. It integrates both a P-channel main switch and an N-channel synchronous rectifier, enabling fully synchronous operation that eliminates conduction losses associated with external diodes. This integration directly contributes to its 96% peak efficiency and simplifies layout by reducing component count. The LTC3406B-2ES5#TRPBF datasheet explicitly states "No Schottky Diode Required" as a key feature.

What is the purpose of the RUN pin on the LTC3406B-2ES5#TRPBF?

On the LTC3406B-2ES5#TRPBF, the RUN pin (Pin 1) serves as the enable/shutdown control input. Driving RUN >1.5V enables regulation; pulling RUN <0.3V places the device in shutdown mode, reducing supply current to <1µA. The pin must never be left floating, as indeterminate voltage may cause erratic behavior. RUN is internally pulled down, so a simple open-drain or logic-level signal suffices for system-level power sequencing. This function is documented in the "Pin Functions" section and electrical characteristics table of the LTC3406B-2ES5#TRPBF datasheet.

Can the LTC3406B-2ES5#TRPBF operate with a 2.5V input supply?

Yes, the LTC3406B-2ES5#TRPBF is fully specified to operate with a minimum input voltage of 2.5V, making it compatible with deeply discharged Li-Ion cells. At 2.5V input, output voltage accuracy and maximum load current are reduced due to higher R_DS(ON) and thermal constraints-Figure 2 shows maximum output current drops to ~400mA at V_IN = 2.5V for V_OUT = 1.8V. The LTC3406B-2ES5#TRPBF maintains regulation via 100% duty cycle, but thermal design must verify junction temperature stays below 125°C.

What package type is used for the LTC3406B-2ES5#TRPBF?

The LTC3406B-2ES5#TRPBF is housed in a 5-lead ThinSOT™ (TSOT-23-5) package, measuring 2.9mm × 1.6mm × 1.0mm with a 0.95mm pitch. This low-profile, surface-mount package features exposed pad thermal enhancement and is RoHS-compliant and halogen-free. The "ES5" suffix in the part number explicitly denotes the TSOT-23-5 variant, and the marking "LTAGH" appears on the top of the device. This package is distinct from larger SOIC or MSOP variants and is optimized for space-constrained portable applications.

LTC3406B-2ES5#TRPBF Specifications

Product attributes: Attribute value

Manufacturer:: Analog Devices Inc.

Series:: -

Package/Case:: SOT-23-5 Thin, TSOT-23-5

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):: 2.5V

Voltage - Input (Max):: 5.5V

Voltage - Output (Min/Fixed):: 0.6V

Voltage - Output (Max):: 5.5V

Current - Output:: 600mA

Frequency - Switching:: 2.25MHz

Synchronous Rectifier:: Yes

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: TSOT-23-5

LTC3406B-2ES5#TRPBF FAQ

1.How can I place an order for LTC3406B-2ES5#TRPBF through Aetrix?

Please submit a Request for Quotation (RFQ) for LTC3406B-2ES5#TRPBF on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for LTC3406B-2ES5#TRPBF reliable?

The price and inventory of LTC3406B-2ES5#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3406B-2ES5#TRPBF is usually 5 days.

3.What payment methods are accepted for LTC3406B-2ES5#TRPBF?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3406B-2ES5#TRPBF transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LTC3406B-2ES5#TRPBF?

LTC3406B-2ES5#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LTC3406B-2ES5#TRPBF order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for LTC3406B-2ES5#TRPBF?

For technical support, including LTC3406B-2ES5#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3406B-2ES5#TRPBF requirements.

6.How does Aetrix verify that LTC3406B-2ES5#TRPBF is sourced from the original manufacturer or authorized distributors?

All LTC3406B-2ES5#TRPBF products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LTC3406B-2ES5#TRPBF meets industry standards.

7.What is the process for return or replacement of LTC3406B-2ES5#TRPBF?

All LTC3406B-2ES5#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3406B-2ES5#TRPBF, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The LTC3406B-2ES5#TRPBF part is unused and in its original packaging.

Return procedure for LTC3406B-2ES5#TRPBF:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

Tech Hub

2026-09-03 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-01 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …

2026-08-28 SR Latch Explained: NOR and NAND Circuits, Truth Tables, and Applications

An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…

2026-08-27 Latch Circuit: SR and D Latches, Truth Tables, Timing, and Applications

Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…

2026-08-21 What Is an LED Driver? Types, Circuits, Dimming, and Selection

An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…

2026-08-18 Operational Amplifier (Op Amp): Basics, Configurations, Feedback and Applications

Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…

2026-08-14 Jumper Cables: How to Use, Connect and Choose Them Safely

Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…