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) > Power Supply Controllers, Monitors

Analog Devices Inc./Maxim Integrated MAX8742EAI

Name: MAX8742EAI
Brand: Analog Devices Inc./Maxim Integrated
SKU: MAX8742EAI
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: MAX8742EAI

Manufacturer:: Analog Devices Inc./Maxim Integrated

Category:: Power Supply Controllers, Monitors

Package:: 28-SSOP (0.209", 5.30mm Width)

Datasheet:: MAX8742EAI.pdf

Description:: POWER-SUPPLY CONTROLLER

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:1,526

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

Product details

Overview

MAX8742EAI from Maxim Integrated is a dual-output, buck-topology power-supply controller with integrated 1A gate drivers, 5V/3.3V adjustable or fixed SMPS outputs, and a dedicated 12V/120mA linear regulator. It operates from 4.2V to 30V input, delivers up to 97% efficiency via synchronous rectification and Idle Mode™ control, and supports programmable power-up sequencing for notebook and subnotebook DC-DC systems.

For engineers reviewing the MAX8742EAI datasheet, MAX8742EAI pinout, MAX8742EAI application, or MAX8742EAI equivalent, key selection criteria include its dual-mode (fixed/adjustable) output configuration, 333kHz/500kHz selectable oscillator, secondary feedback capability (via VDD), overvoltage/undervoltage protection, and 28-pin SSOP package with validated thermal performance across –40°C to +85°C.

Technical Context

The MAX8742EAI integrates two independent PWM controllers-one for 3.3V and one for 5V outputs-each supporting both fixed (3.3V/5V) and adjustable (2.5V–5.5V) modes via dual-mode feedback inputs (FB3/FB5). Its internal 500kHz (or 333kHz) oscillator is synchronizable, and Idle Mode™ enables pulse-skipping at light loads to maintain >80% efficiency over a 1000:1 load-current range.

Unlike the MAX8741, the MAX8742EAI embeds a 12V linear regulator (12OUT) powered from VDD, with built-in VDD regulation threshold (13V–14V), shunt clamp (18V–20V), and flyback feedback path. It lacks SECFB and STEER pins but retains full power-good signaling, digital soft-start, and high-impedance shutdown with 4µA typical current.

Key Specifications

Parameter	Value and Actual Design Meaning
Input Voltage Range	4.2V to 30V - supports wide battery input including Li-ion stacks and industrial 24V rails.
SMPS Output Voltages	3.3V fixed (±3.9%) or adjustable (2.5V–5.5V); 5V fixed (±4.3%) or adjustable - enables flexible logic supply generation.
Oscillator Frequency	500kHz (SYNC = VL) or 333kHz (SYNC = GND) - reduces EMI in mobile comms while enabling compact magnetics.
12V Linear Regulator	12.10V ±0.45V at 0–120mA load - provides stable auxiliary rail without external LDO, sourced from VDD.
Gate-Drive Capability	1A sink/source per channel (DH3/DL3/DH5/DL5) - drives n-channel MOSFETs directly with <7Ω on-resistance (SSOP).
Protection Features	Output overvoltage trip (4–10%), undervoltage lockout (60–80% of nominal), thermal shutdown at +150°C - ensures system-level fault resilience.
Quiescent Power	2.5mW typical (12V input, both SMPS enabled) - extends battery life in suspend/standby states.

Pinout & Package

MAX8742EAI is housed in a 28-pin SSOP (Shrink Small Outline Package) with 0.65mm pitch, rated for –40°C to +85°C operation. The package supports standard reflow profiles and provides adequate thermal dissipation (762mW at +70°C) for typical notebook power applications.

Pin	Circuit Role	Design Meaning
1 (CSH3)	3.3V SMPS current-sense high-side input	Monitors high-side MOSFET current; triggers shutdown at –100mV relative to CSL3.
2 (CSL3)	3.3V SMPS current-sense low-side / feedback input	Serves as return path for CSH3 and feedback node in fixed-output mode (FB3 = GND).
3 (FB3)	3.3V SMPS feedback input	Regulates at REF (~2.5V) in adjustable mode; selects fixed 3.3V when tied to GND.
4 (VDD)	Flyback supply input / 12V LDO input	Accepts coupled-inductor flyback voltage; powers 12OUT and enables secondary feedback regulation.
5 (GND)	Analog ground reference	Low-noise return for feedback, reference, and sensing circuits - must be star-connected.
6 (REF)	Precision 2.5V reference output	Stable 2.5V ±20mV reference for FB3/FB5; requires ≥1µF bypass capacitor.
7 (SKIP)	Idle Mode disable control	Logic-high disables pulse-skipping; connect to GND for normal low-noise fixed-frequency operation.
8 (RESET)	Active-low timed reset output	Asserts after 32,000 clock cycles post-power-up; monitors both SMPS outputs for valid regulation.
9 (FB5)	5V SMPS feedback input	Regulates at REF (~2.5V) in adjustable mode; selects fixed 5V when tied to GND.
10 (CSL5)	5V SMPS current-sense low-side / bootstrap supply	Provides bootstrapping voltage for DH5 when >4.5V; also serves as feedback node in fixed mode.
11 (CSH5)	5V SMPS current-sense high-side input	Triggers current limit at –100mV relative to CSL5; enables cycle-by-cycle protection.
12 (SEQ)	Power-up sequence select	Strap pin: GND = 5V before 3.3V; REF = independent ON3/ON5 control; VL = 3.3V before 5V.
13 (DH5)	5V high-side gate driver output	Floating driver swinging from LX5 to BST5; requires 0.1µF BST5 capacitor for bootstrap operation.
14 (LX5)	5V switching-node connection	Connects to inductor; tolerates –2V undershoot - critical for layout grounding and EMI control.
15 (BST5)	5V high-side boost capacitor terminal	Connects 0.1µF capacitor between BST5 and LX5 to generate gate drive above V+.
16 (DL5)	5V low-side gate driver output	Drives synchronous rectifier MOSFET from 0V to VL (5V rail); complements DH5 for efficiency.
17 (PGND)	Power ground	Separate return path for high-current switching paths - must be isolated from analog GND.
18 (VL)	Internal 5V linear-regulator output	Supplies IC core logic; auto-switches to CSL5 when 5V SMPS reaches 4.5V for bootstrapping.
19 (V+)	Main input supply (4.2V–30V)	Battery or DC input; requires local 0.22µF ceramic bypass to PGND near pin.
20 (SHDN)	Active-low shutdown control	Logic-low (<1V) places device in high-impedance state with 4µA typical supply current.
21 (DL3)	3.3V low-side gate driver output	Drives synchronous rectifier MOSFET from 0V to VL - enables high-efficiency buck conversion.
22 (BST3)	3.3V high-side boost capacitor terminal	Connects 0.1µF capacitor between BST3 and LX3 for 3.3V high-side gate drive.
23 (LX3)	3.3V switching-node connection	Inductor connection point; same –2V undershoot tolerance as LX5.
24 (DH3)	3.3V high-side gate driver output	Floating driver referenced to LX3; requires BST3 capacitor for proper high-side switching.
25 (RUN/ON3)	3.3V ON/OFF control input	Logic-high enables 3.3V SMPS; timing controlled by TIME/ON5 capacitor when SEQ ≠ REF.
26 (TIME/ON5)	Timing capacitor / 5V ON/OFF input	Capacitor sets soft-start ramp time; also functions as logic-controlled 5V enable when SEQ ≠ REF.
27 (12OUT)	12V linear-regulator output	Delivers 12V/120mA; requires ≥1µF bypass to GND - no external pass transistor needed.
28 (N.C.)	No connection	Not bonded; leave unconnected and unpopulated on PCB.

Key Features

Feature	Design Value
Dual-mode SMPS outputs	Each output supports fixed (3.3V/5V) or adjustable (2.5V–5.5V) regulation - eliminates need for external resistor dividers in standard configurations.
Idle Mode™ control	Automatically switches to pulse-skipping at light loads - sustains >80% efficiency down to 1mA output current, extending battery runtime.
Integrated 12V linear regulator	12OUT delivers regulated 12V/120mA directly from VDD - replaces discrete LDO in flyback-auxiliary designs, reducing BOM count and board area.
Programmable power-up sequencing	SEQ pin selects 3.3V-first, 5V-first, or independent control - ensures safe power-rail ordering in multi-voltage SoC systems.
High-impedance shutdown	4µA typical shutdown current with full isolation of all outputs - meets stringent standby power requirements for ACPI S3/S4 states.
Robust fault protection	Independent overvoltage (4–10%), undervoltage (60–80%), and thermal shutdown (150°C) - prevents damage during transient faults or misconfiguration.

Applications

Notebook Power Management	Subnotebook DC-DC Conversion
Use Scenario: Primary logic supply generation in 12V-input notebook platforms requiring clean, sequenced 3.3V and 5V rails. IC Role / Device Role / Timing Role: Dual-output buck controller managing main CPU/memory I/O supplies with RESET assertion only after both outputs stabilize. Use Value: Eliminates need for discrete sequencing ICs and external LDOs; 97% peak efficiency reduces thermal load on compact chassis.	Use Scenario: Compact, battery-powered subnotebooks with tight space constraints and aggressive standby current targets. IC Role / Device Role / Timing Role: High-efficiency, low-quiescent controller delivering 3.3V/5V/12V from single-cell Li-ion (4.2V–30V input range). Use Value: Idle Mode™ maintains >80% efficiency at 100µA load, enabling weeks of standby time without compromising dynamic response.
Mobile Communicator Power System	Desktop CPU Local Converter
Use Scenario: Powering baseband and application processors in PDAs and early smartphones with variable battery voltage. IC Role / Device Role / Timing Role: Dual SMPS with programmable sequencing and fast transient response (<5 clock cycles) for burst-mode processing loads. Use Value: 1A gate drivers support low-R_DS(on) MOSFETs, minimizing conduction loss; SYNC pin enables EMI reduction via frequency dithering.	Use Scenario: Local DC-DC conversion for desktop CPU core voltage domains where input is derived from ATX 12V rail. IC Role / Device Role / Timing Role: Fixed-frequency (500kHz) buck controller generating tightly regulated 3.3V/5V for peripheral logic with minimal noise coupling. Use Value: SKIP pin enables fixed-frequency operation under all loads - critical for noise-sensitive audio and display subsystems.

Notebook Power Management

Subnotebook DC-DC Conversion

Use Scenario: Primary logic supply generation in 12V-input notebook platforms requiring clean, sequenced 3.3V and 5V rails.

IC Role / Device Role / Timing Role: Dual-output buck controller managing main CPU/memory I/O supplies with RESET assertion only after both outputs stabilize.

Use Value: Eliminates need for discrete sequencing ICs and external LDOs; 97% peak efficiency reduces thermal load on compact chassis.

Use Scenario: Compact, battery-powered subnotebooks with tight space constraints and aggressive standby current targets.

IC Role / Device Role / Timing Role: High-efficiency, low-quiescent controller delivering 3.3V/5V/12V from single-cell Li-ion (4.2V–30V input range).

Use Value: Idle Mode™ maintains >80% efficiency at 100µA load, enabling weeks of standby time without compromising dynamic response.

Mobile Communicator Power System

Desktop CPU Local Converter

Use Scenario: Powering baseband and application processors in PDAs and early smartphones with variable battery voltage.

IC Role / Device Role / Timing Role: Dual SMPS with programmable sequencing and fast transient response (<5 clock cycles) for burst-mode processing loads.

Use Value: 1A gate drivers support low-R_DS(on) MOSFETs, minimizing conduction loss; SYNC pin enables EMI reduction via frequency dithering.

Use Scenario: Local DC-DC conversion for desktop CPU core voltage domains where input is derived from ATX 12V rail.

IC Role / Device Role / Timing Role: Fixed-frequency (500kHz) buck controller generating tightly regulated 3.3V/5V for peripheral logic with minimal noise coupling.

Use Value: SKIP pin enables fixed-frequency operation under all loads - critical for noise-sensitive audio and display subsystems.

Equivalent & Alternatives

The following parts are listed as comparable options for similar multi-output buck controller applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MAX8741EAI	Lacks integrated 12V LDO; includes SECFB and STEER pins for transformer-coupled secondary feedback instead of VDD-based regulation.	Suitable for designs requiring adjustable auxiliary voltages (e.g., 15V, 19V) via flyback winding, not fixed 12V.	Select MAX8741EAI when secondary feedback flexibility outweighs need for integrated 12V output.
TPS51116PWR	TI dual-output controller with integrated 5V LDO (not 12V), different sequencing architecture, and no Idle Mode - uses D-CAP control instead of PWM.	Optimized for Intel VR11/VR12 CPU power with active phase shedding; less suited for generic 12V-input notebook rails.	Choose TPS51116PWR only for Intel-compatible CPU power delivery with strict VID interface requirements.

Compared with MAX8741EAI and TPS51116PWR, the MAX8742EAI uniquely combines fixed 12V linear regulation, dual-mode SMPS outputs, and Idle Mode™ for battery longevity - making it optimal for cost-sensitive, space-constrained notebook platforms needing three regulated rails from one IC.

Availability

MAX8742EAI is available at Aetrix Electronics and suitable for notebook computers, subnotebook systems, and mobile communicators requiring stable component supply, long-term lifecycle support, and guaranteed traceability for production programs.

Supply support for MAX8742EAI 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

Maxim Integrated (now part of Analog Devices) is a semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for demanding applications.

The MAX8742EAI belongs to Maxim's notebook power-controller product line, designed specifically to replace discrete DC-DC solutions in portable computing with integrated sequencing, protection, and efficiency optimization.

FAQ

What is the maximum input voltage supported by the MAX8742EAI?

The MAX8742EAI supports an absolute maximum input voltage of +36V on the V+ pin, with continuous operation specified from 4.2V to 30V. This wide range accommodates multi-cell Li-ion batteries and industrial 24V supplies. Operation above 30V is not recommended for sustained use due to increased thermal stress and potential derating of internal regulators.

Does the MAX8742EAI require external components for the 12V linear regulator?

No, the MAX8742EAI does not require external pass transistors or compensation components for the 12V linear regulator. The 12OUT pin delivers a fully regulated 12.10V ±0.45V output at up to 120mA, conditioned only by a minimum 1µF ceramic bypass capacitor to GND. The regulator draws power directly from the VDD pin, which must be supplied by a flyback winding or auxiliary source.

How does the MAX8742EAI handle power-up sequencing between the 3.3V and 5V outputs?

The MAX8742EAI implements programmable sequencing via the SEQ pin: tying SEQ to GND sequences 5V before 3.3V; tying SEQ to VL sequences 3.3V before 5V; and tying SEQ to REF enables independent ON3/ON5 control. The RESET output asserts only after both outputs reach regulation, ensuring reliable system initialization in all configurations.

Can the MAX8742EAI operate in fixed-frequency mode under all load conditions?

Yes, asserting the SKIP pin high disables Idle Mode™ and forces fixed-frequency PWM operation at either 333kHz (SYNC = GND) or 500kHz (SYNC = VL), regardless of load. This eliminates low-frequency ripple and simplifies EMI filtering - essential for noise-sensitive applications like touchscreens and audio subsystems.

What is the purpose of the VDD pin on the MAX8742EAI?

The VDD pin on the MAX8742EAI serves three critical roles: (1) it supplies the internal 12V linear regulator (12OUT), (2) it provides the input for the flyback secondary feedback loop, and (3) it connects to an internal 18V–20V shunt clamp for overvoltage protection. VDD must be driven by a coupled-inductor flyback winding or auxiliary supply capable of delivering ≥120mA.

MAX8742EAI Specifications

Product attributes: Attribute value

Manufacturer:: Analog Devices Inc./Maxim Integrated

Series:: -

Package/Case:: 28-SSOP (0.209", 5.30mm Width)

Packaging:: Bulk

Product Status:: Active

Programmable:: Not Verified

Applications:: Power Supply Controller

Voltage - Input:: 30V ~ 30V

Voltage - Supply:: 4.2V ~ 30V

Current - Supply:: -

Operating Temperature:: -40°C ~ 85°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 28-SSOP

MAX8742EAI FAQ

1.How can I place an order for MAX8742EAI through Aetrix?

Please submit a Request for Quotation (RFQ) for MAX8742EAI 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 MAX8742EAI reliable?

The price and inventory of MAX8742EAI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8742EAI is usually 5 days.

3.What payment methods are accepted for MAX8742EAI?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8742EAI transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MAX8742EAI?

MAX8742EAI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MAX8742EAI 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 MAX8742EAI?

For technical support, including MAX8742EAI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8742EAI requirements.

6.How does Aetrix verify that MAX8742EAI is sourced from the original manufacturer or authorized distributors?

All MAX8742EAI 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 MAX8742EAI meets industry standards.

7.What is the process for return or replacement of MAX8742EAI?

All MAX8742EAI units undergo pre-shipment inspection (PSI). If there is an issue with MAX8742EAI, 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 MAX8742EAI part is unused and in its original packaging.

Return procedure for MAX8742EAI:

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…