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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > DC DC Switching Controllers

Analog Devices Inc. LTC3810EUH-5#TRPBF

Name: LTC3810EUH-5#TRPBF
Brand: Analog Devices Inc.
SKU: LTC3810EUH-5#TRPBF
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LTC3810EUH-5#TRPBF

Manufacturer:: Analog Devices Inc.

Category:: DC DC Switching Controllers

Package:: 32-WFQFN Exposed Pad

Datasheet:: LTC3810EUH-5#TRPBF.pdf

Description:: IC REG CTRLR BUCK 32QFN

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Product details

Overview

LTC3810EUH-5#TRPBF from Analog Devices (formerly Linear Technology) is a 60V synchronous step-down switching regulator controller using constant on-time valley current mode control. It delivers precise 0.8V ±0.5% reference accuracy, supports up to 60V input, drives dual N-channel MOSFETs without a sense resistor, and operates with minimum on-time <100ns - ideal for telecom 48V power supplies and automotive high-voltage DC/DC conversion.

For engineers reviewing the LTC3810EUH-5#TRPBF datasheet, LTC3810EUH-5#TRPBF pinout, LTC3810EUH-5#TRPBF application, or LTC3810EUH-5#TRPBF equivalent, key selection criteria include its 60V max VIN capability, no-R_SENSE current sensing, programmable frequency via ION resistor, 25MHz error amplifier bandwidth, and 5mm × 5mm QFN-32 package with exposed thermal pad.

Technical Context

The LTC3810EUH-5#TRPBF implements a constant on-time valley current mode architecture where top MOSFET conduction duration is set by an external ION resistor and modulated by VON voltage, enabling stable operation at ultra-low duty cycles. Its 25MHz error amplifier delivers fast line/load transient response, while cycle-by-cycle current limiting is enforced via ITH voltage-controlled threshold without requiring a sense resistor.

Gate drive is split between a 1Ω pull-down TG driver (floating, BOOST-supplied) and a 1Ω pull-down BG driver (DRVCC-supplied), both capable of >0.7A peak source current. Bias generation switches automatically between EXTVCC (≥4.7V) and NDRV-regulated INTVCC, supporting startup and short-circuit conditions via an external SOT23 MOSFET.

Key Specifications

Parameter	Value and Actual Design Meaning
Max Input Voltage	60V continuous - enables direct regulation from 48V telecom or 36–60V automotive battery rails without pre-regulation.
Reference Accuracy	±0.5% at 0.8V - ensures tight output voltage tolerance across –40°C to 125°C junction temperature range.
Min On-Time	<100ns - supports high VIN-to-VOUT ratios (e.g., 48V → 3.3V) at 250kHz+ switching frequencies.
Error Amp Bandwidth	25MHz - provides sub-microsecond load transient recovery, critical for CPU/GPU VRMs and FPGA power.
Gate Driver Strength	1Ω pull-down R_DS(ON) per driver - allows parallel MOSFET driving and fast slew rates for low switching losses.
Shutdown Current	240µA - minimizes system standby power in always-on automotive or networking applications.
PGOOD Threshold	±10% V_FB window with 120µs delay - provides reliable power sequencing and fault detection in multi-rail systems.

Pinout & Package

Package: 32-lead 5mm × 5mm plastic QFN with exposed thermal pad (Pin 33 = SGND), rated for –40°C to 125°C operating junction temperature.

Pin/Terminal	Circuit Role	Design Meaning
VON (2)	On-time voltage input	Sets comparator trip point; tied to INTVCC for high-VOUT designs to reduce R_ON dependency.
VRNG (3)	Sense voltage limit set	Programs max current sense threshold from 95mV (ground) to 215mV (INTVCC) - defines cycle-by-cycle current limit.
PGOOD (4)	Open-drain power-good output	Pulled low when V_FB deviates >±10% for ≥120µs - used for system enable/disable sequencing.
MODE/SYNC (5)	Pulse skip enable / sync input	Pull <0.8V for forced continuous mode; apply external clock for noise-sensitive synchronization.
ITH (6)	Error amp compensation / current threshold	Voltage (0–2.6V) sets valley current limit; 1.2V = zero-current threshold - core of current-mode loop.
VFB (7)	Feedback input	Connects to resistor divider from V_OUT; regulates output to 0.8V reference - primary control node.
SS/TRACK (9)	Soft-start / tracking input	Capacitor to ground sets soft-start ramp (~0.6s/µF); resistive divider enables ratiometric tracking of another rail.
SHDN (12)	Shutdown control	Pull <1.5V to disable both MOSFETs and reduce supply current to 240µA - enables system-level power gating.
UVIN (13)	Input undervoltage lockout	Resistive divider from VIN sets UVLO threshold; internal 0.8V reference with 10% hysteresis - prevents brownout operation.
NDRV (14)	External pass device drive	Drives gate of NMOS linear regulator for INTVCC during startup/short-circuit - enables bias from VIN when EXTVCC unavailable.
EXTVCC (15)	External driver supply	≥4.7V triggers internal LDO to power INTVCC/DRVCC - improves efficiency vs. NDRV-based biasing.
INTVCC (16)	Main IC supply	Bypassed with ≥0.1µF capacitor; powers all internal circuits except drivers - critical for noise immunity.
DRVCC (17)	Bottom gate driver supply	Typically tied to INTVCC; bypassed to BGRTN with 1–10µF X5R cap - stabilizes BG driver return path.
BG (18)	Bottom gate drive	Drives source-connected N-MOSFET; swings from BGRTN to DRVCC - requires Kelvin connection to MOSFET source.
BGRTN (19)	Bottom gate return	Separate return pin for BG driver; allows negative supply to suppress Miller-induced shoot-through during high dV/dt.
SENSE– (20)	Current sense negative input	Kelvin connection to MOSFET source or sense resistor low-side - enables accurate valley current measurement.
SW (25)	Switch node	Connects to inductor and BOOST capacitor; swings from –0.7V (Schottky drop) to VIN - defines high-side switching node.
TG (26)	Top gate drive	Floating driver powered by BOOST; returns to SW - enables true high-side N-MOSFET drive without level shifter.
BOOST (27)	Top gate driver supply	Bypassed to SW with 0.1µF X5R cap; charged via external Schottky from DRVCC - sustains TG drive during off-time.
ION (31)	On-time current input	Resistor from VIN sets one-shot timer current - directly programs switching frequency independent of VIN variation.
SGND (33)	Signal ground	Exposed thermal pad; must be soldered to PCB ground plane - provides low-impedance analog reference and thermal path.

Key Features

Feature	Design Value
No current sense resistor required	Uses MOSFET R_DS(ON) for valley current sensing - eliminates power loss, board space, and cost of discrete sense resistor.
Constant on-time valley current mode	Maintains stable operation at ultra-low duty cycles (<5%) without slope compensation - simplifies design for high VIN/VOUT ratios.
Programmable pulse skip / forced continuous mode	MODE/SYNC pin selects light-load efficiency (pulse skip) or fast transient response (forced continuous) - adapts to dynamic load profiles.
Integrated bias control with dual sourcing	Automatically switches INTVCC/DRVCC supply between EXTVCC (≥4.7V) and NDRV-regulated path - ensures robust startup and fault recovery.
Output overvoltage protection	OV comparator disables TG and enables BG immediately on V_FB >1.2V - prevents damage to downstream loads during regulation failure.
Adjustable cycle-by-cycle current limit	VRNG pin sets nominal sense threshold from 95mV to 215mV - enables precise current limiting matched to MOSFET R_DS(ON).

Applications

Telecom 48V Intermediate Bus Converter	Automotive ADAS Power Supply
Use Scenario: Regulating 48V telecom battery to 12V intermediate bus for PoE switches and base station radios. IC Role / Device Role / Timing Role: Primary synchronous buck controller managing high-efficiency, high-reliability DC/DC conversion with no sense resistor. Use Value: 60V max VIN withstands load dump transients; ±0.5% reference ensures stable 12V bus under wide temperature and line variation.	Use Scenario: Generating 5V/3.3V rails for radar sensors and camera modules in 12V/24V automotive systems. IC Role / Device Role / Timing Role: High-voltage buck controller with integrated UVLO, PGOOD, and OVP for functional safety compliance. Use Value: Programmable UVIN threshold enables cold-crank support down to 4.5V; PGOOD delay ensures clean power sequencing before MCU boot.
Industrial PLC I/O Module Power	Networking Equipment DC/DC Stage
Use Scenario: Converting 24V industrial bus to isolated 5V/15V for analog sensor interfaces and digital I/O drivers. IC Role / Device Role / Timing Role: Controller for non-isolated buck stage feeding isolated flyback or forward converters. Use Value: 25MHz error amplifier enables fast response to step loads from solenoid actuation; adjustable soft-start prevents inrush into downstream isolation stages.	Use Scenario: Point-of-load regulation in 1U servers and edge routers converting 12V backplane to 1.8V/1.2V for ASICs and FPGAs. IC Role / Device Role / Timing Role: High-frequency synchronous buck controller with precise current limit for high-current, low-VOUT rails. Use Value: <100ns min on-time supports 12V→1.2V at 500kHz; dual N-MOSFET drive enables paralleled MOSFETs for >30A output.

Telecom 48V Intermediate Bus Converter

Automotive ADAS Power Supply

Use Scenario: Regulating 48V telecom battery to 12V intermediate bus for PoE switches and base station radios.

IC Role / Device Role / Timing Role: Primary synchronous buck controller managing high-efficiency, high-reliability DC/DC conversion with no sense resistor.

Use Value: 60V max VIN withstands load dump transients; ±0.5% reference ensures stable 12V bus under wide temperature and line variation.

Use Scenario: Generating 5V/3.3V rails for radar sensors and camera modules in 12V/24V automotive systems.

IC Role / Device Role / Timing Role: High-voltage buck controller with integrated UVLO, PGOOD, and OVP for functional safety compliance.

Use Value: Programmable UVIN threshold enables cold-crank support down to 4.5V; PGOOD delay ensures clean power sequencing before MCU boot.

Industrial PLC I/O Module Power

Networking Equipment DC/DC Stage

Use Scenario: Converting 24V industrial bus to isolated 5V/15V for analog sensor interfaces and digital I/O drivers.

IC Role / Device Role / Timing Role: Controller for non-isolated buck stage feeding isolated flyback or forward converters.

Use Value: 25MHz error amplifier enables fast response to step loads from solenoid actuation; adjustable soft-start prevents inrush into downstream isolation stages.

Use Scenario: Point-of-load regulation in 1U servers and edge routers converting 12V backplane to 1.8V/1.2V for ASICs and FPGAs.

IC Role / Device Role / Timing Role: High-frequency synchronous buck controller with precise current limit for high-current, low-VOUT rails.

Use Value: <100ns min on-time supports 12V→1.2V at 500kHz; dual N-MOSFET drive enables paralleled MOSFETs for >30A output.

Equivalent & Alternatives

The following parts are listed as comparable options for similar synchronous buck controller applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
LTC3891EMSE-5#TRPBF	Wider 4–60V input range; integrated 5V/150mA LDO for bias; no EXTVCC/NDRV complexity.	Better suited for systems needing self-contained bias without external MOSFET; lacks VRNG-programmable current limit.	Select when simplified layout and integrated bias outweigh need for ultra-low-duty-cycle optimization.
MP2918GL-Z	4.5–60V input; 1.2V reference; no constant on-time architecture - uses average current mode with slope compensation.	Requires sense resistor; lower reference accuracy (±1%); lacks PGOOD hysteresis and foldback protection.	Select for cost-sensitive industrial applications where ±1% VREF and basic protection suffice.

Compared with LTC3891EMSE-5#TRPBF and MP2918GL-Z, the LTC3810EUH-5#TRPBF offers superior low-duty-cycle capability (<100ns), no-R_SENSE operation, and tighter reference accuracy (±0.5%), making it optimal for high-ratio telecom and automotive buck designs where precision and transient performance are critical.

Availability

LTC3810EUH-5#TRPBF is available at Aetrix Electronics and suitable for telecom 48V power supplies, automotive ADAS ECUs, and industrial PLC I/O modules requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant packaging.

Supply support for LTC3810EUH-5#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 product support, documentation, and manufacturing continuity for all Linear-branded power management ICs.

The LTC3810EUH-5#TRPBF belongs to Linear's high-voltage synchronous buck controller family, designed specifically for efficient, high-reliability DC/DC conversion in telecom, automotive, and industrial systems operating up to 60V input.

FAQ

What is the maximum input voltage rating for the LTC3810EUH-5#TRPBF?

The LTC3810EUH-5#TRPBF has a maximum continuous input voltage rating of 60V on the VIN and SW pins, with absolute maximum ratings extending to 70V for ≤400ms. This enables direct use in 48V telecom systems and 24V/36V automotive applications without pre-regulation stages. The 60V rating is confirmed in the Absolute Maximum Ratings table and supported by typical application circuits operating at 48V and 60V inputs.

Does the LTC3810EUH-5#TRPBF require an external current sense resistor?

No, the LTC3810EUH-5#TRPBF does not require an external current sense resistor. It implements no-R_SENSE valley current sensing by measuring the voltage drop across the bottom N-channel MOSFET's R_DS(ON) using the SENSE+ and SENSE– pins. This is explicitly stated in the Features list and confirmed in the Functional Diagram and Applications Information sections of the datasheet.

How is the switching frequency programmed on the LTC3810EUH-5#TRPBF?

The switching frequency of the LTC3810EUH-5#TRPBF is programmed by connecting a resistor from VIN to the ION pin (Pin 31). The on-time is proportional to this resistor value, and the resulting frequency remains stable across input voltage variations. Typical values range from 100kΩ (≈250kHz) to 1MΩ (≈50kHz), with exact calculation provided in the datasheet's "Oscillator and Phase-Locked Loop" section.

What is the purpose of the BGRTN pin on the LTC3810EUH-5#TRPBF?

The BGRTN pin (Pin 19) is the dedicated return path for the bottom gate driver (BG). It is separated from signal ground to allow connection of a negative supply (e.g., –2V), which counteracts Miller capacitance-induced gate voltage spikes during high dV/dt transitions at the SW node - preventing false turn-on and shoot-through of the bottom MOSFET. This is detailed in the Pin Functions section and Applications Information.

Can the LTC3810EUH-5#TRPBF be synchronized to an external clock?

Yes, the LTC3810EUH-5#TRPBF can be synchronized to an external clock via the MODE/SYNC pin (Pin 5). When an external logic-level clock signal is applied, the internal phase-locked loop forces the rising edge of the top gate (TG) signal to align with the rising edge of the external clock - essential for reducing EMI in noise-sensitive applications like medical or test equipment. This capability is confirmed in the Features list and Electrical Characteristics table.

LTC3810EUH-5#TRPBF Specifications

Product attributes: Attribute value

Manufacturer:: Analog Devices Inc.

Series:: -

Package/Case:: 32-WFQFN Exposed Pad

Packaging:: Tape & Reel (TR)

Product Status:: Active

Output Type:: Transistor Driver

Function:: Step-Down

Output Configuration:: Positive

Topology:: Buck

Number of Outputs:: 1

Output Phases:: 1

Voltage - Supply (Vcc/Vdd):: 4.35V ~ 14V

Frequency - Switching:: -

Duty Cycle (Max):: -

Synchronous Rectifier:: Yes

Clock Sync:: Yes

Serial Interfaces:: -

Control Features:: Enable, Power Good, Soft Start, Tracking

Operating Temperature:: -40°C ~ 125°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 32-QFN (5x5)

LTC3810EUH-5#TRPBF FAQ

1.How can I place an order for LTC3810EUH-5#TRPBF through Aetrix?

Please submit a Request for Quotation (RFQ) for LTC3810EUH-5#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 LTC3810EUH-5#TRPBF reliable?

The price and inventory of LTC3810EUH-5#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3810EUH-5#TRPBF is usually 5 days.

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We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3810EUH-5#TRPBF transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LTC3810EUH-5#TRPBF?

LTC3810EUH-5#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LTC3810EUH-5#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 LTC3810EUH-5#TRPBF?

For technical support, including LTC3810EUH-5#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3810EUH-5#TRPBF requirements.

6.How does Aetrix verify that LTC3810EUH-5#TRPBF is sourced from the original manufacturer or authorized distributors?

All LTC3810EUH-5#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 LTC3810EUH-5#TRPBF meets industry standards.

7.What is the process for return or replacement of LTC3810EUH-5#TRPBF?

All LTC3810EUH-5#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3810EUH-5#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 LTC3810EUH-5#TRPBF part is unused and in its original packaging.

Return procedure for LTC3810EUH-5#TRPBF:

1.Submit a request within 90 days.

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

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