Analog Devices Inc. LTC1436AEGN#TRPBF

Overview

LTC1436AEGN#TRPBF from Analog Devices (formerly Linear Technology) is a synchronous step-down switching regulator controller with integrated adaptive power stage, supporting 3.5V to 36V input, 1.19V–9V programmable output, and dual N-channel MOSFET drive. It delivers high efficiency down to 1% load via Adaptive Power™ mode, includes a 0.5A auxiliary linear regulator for low-noise I/O supplies, and features PLL-lockable fixed-frequency operation up to 400kHz - used in notebook CPU core/I/O power rails and portable instrumentation.

For engineers reviewing the LTC1436AEGN#TRPBF datasheet, LTC1436AEGN#TRPBF pinout, LTC1436AEGN#TRPBF application, or LTC1436AEGN#TRPBF equivalent, key selection criteria include minimum on-time (≤300ns), remote voltage sense capability, programmable soft start, logic-controlled micropower shutdown (IQ < 25µA), and secondary feedback (SFB) support for multi-output regulation.

Technical Context

The LTC1436AEGN#TRPBF implements a constant-frequency current-mode control architecture with an error amplifier (ITH pin), peak-current sensing (SENSE+/SENSE−), and adaptive gate drive routing between TGL/BG (high-current) and TGS (low-current) outputs. Its Adaptive Power™ stage dynamically selects between large and small external N-MOSFETs to maintain fixed-frequency operation down to ~1% of full load.

It integrates a 5V internal LDO (INTVCC), EXTVCC switchover at 4.7V, programmable oscillator (COSC), phase-locked loop interface (PLLIN/PLL LPF), and auxiliary 12V/1.2V linear regulator control (AUXON/AUXDR/AUXFB). The device supports remote output sensing (VOSENSE), foldback current limiting, and built-in power-on reset with 65536-cycle delay.

Key Specifications

Pinout & Package

Package: 24-Lead Narrow SSOP (GN), 150-mil body, RoHS-compliant, moisture-sensitive level 3.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LTC1436ACGN#TRPBF, LTC1436AEGN#TRPBF guarantees full electrical performance across –40°C to 85°C, while LTC1436AIGN#TRPBF offers identical specs with alternate packaging - all three share the same Adaptive Power™ architecture, pinout, and feature set.

Availability

LTC1436AEGN#TRPBF is available at Aetrix Electronics and suitable for notebook computing, portable instrumentation, and industrial DC distribution systems requiring stable component supply, extended temperature operation, and high-efficiency synchronous buck control.

Supply support for LTC1436AEGN#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 its high-performance power management portfolio with rigorous qualification and long-term product support.

The LTC1436A series belongs to Linear's precision synchronous buck controller family, designed specifically for high-efficiency, low-noise, multi-rail power in portable and embedded systems with demanding thermal and EMI constraints.

FAQ

What is the operating temperature range for the LTC1436AEGN#TRPBF?

The LTC1436AEGN#TRPBF is rated for –40°C to +85°C ambient operation, qualified per industrial-grade specifications. This extended temperature range ensures reliable startup and regulation in outdoor, automotive-adjacent, and factory-floor environments where thermal stress exceeds commercial limits. All electrical parameters in the datasheet are guaranteed across this full range unless otherwise noted.

Does the LTC1436AEGN#TRPBF support synchronization to an external clock?

Yes, the LTC1436AEGN#TRPBF supports external clock synchronization via its PLLIN and PLL LPF pins - but only when configured as the LTC1436A-PLL variant. The standard LTC1436AEGN#TRPBF does not include the PLL circuitry; confirmation requires checking the suffix (e.g., LTC1436AEGN-PLL#TRPBF). For non-PLL versions, frequency is set solely by COSC.

How does the Adaptive Power™ mode work in the LTC1436AEGN#TRPBF?

The LTC1436AEGN#TRPBF's Adaptive Power™ mode automatically routes gate drive from TGL (large MOSFET) to TGS (small MOSFET) when load drops below ~1% of full scale. This preserves fixed-frequency operation and avoids Burst Mode noise - unlike conventional controllers that switch to discontinuous conduction. The transition is triggered by current reversal detection (I2 comparator) and hysteresis-based reversion at ITH > 0.6V or RSENSE voltage > 20mV.

Can the LTC1436AEGN#TRPBF drive both high-side and low-side N-channel MOSFETs?

Yes, the LTC1436AEGN#TRPBF integrates dual N-channel gate drivers: TGL (high-side, floating) and BG (low-side, grounded), both capable of 2A peak current. It also provides TGS for adaptive low-current drive. External bootstrap capacitor (CB) is required for high-side drive, and the dropout detector ensures CB recharge during low-VIN operation - enabling full N-N synchronous topology without P-channel or driver ICs.

What is the purpose of the SFB pin on the LTC1436AEGN#TRPBF?

The SFB (Secondary Feedback) pin on the LTC1436AEGN#TRPBF enables regulation of auxiliary transformer windings independent of the main output. When tied to ground, it forces continuous conduction mode. When connected to a resistive divider from a secondary winding, it guarantees regulation even under light or no load on the main output - critical for multi-output flyback or forward converters where cross-regulation must be maintained.