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

Analog Devices Inc./Maxim Integrated MAX15039ETG+

Name: MAX15039ETG+
Brand: Analog Devices Inc./Maxim Integrated
SKU: MAX15039ETG+
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MAX15039ETG+

Manufacturer:: Analog Devices Inc./Maxim Integrated

Category:: Voltage Regulators - DC DC Switching Regulators

Package:: 24-WFQFN Exposed Pad

Datasheet:: MAX15039ETG+.pdf

Description:: IC REG BUCK ADJ 6A 24TQFN

Quantity:: RFQ Add To RFQ list

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Product details

Overview

MAX15039ETG+ from Maxim Integrated is a 6A, 2MHz synchronous step-down DC-DC regulator with integrated 26mΩ high-side and 20mΩ low-side nMOSFETs, operating from 2.9V to 5.5V input and delivering adjustable output from 0.6V to 90% of VIN. It achieves ±1% output voltage accuracy over load, line, and temperature, features voltage-mode control with 28MHz error amplifier bandwidth, and supports monotonic startup into prebiased outputs - ideal for DDR, ASIC core, and telecom POL applications.

For engineers reviewing the MAX15039ETG+ datasheet, MAX15039ETG+ pinout, MAX15039ETG+ application, or MAX15039ETG+ equivalent, this page delivers verified technical context, confirmed pin functions, nine preset output voltage options (0.6V–2.5V), soft-start programmability via external capacitor, and validated alternatives for point-of-load power design.

Technical Context

The MAX15039ETG+ employs voltage-mode control architecture with a 28MHz error amplifier and type III compensation support, enabling loop bandwidth up to 20% of switching frequency for fast transient response. Its fixed-frequency PWM operation (500kHz–2MHz, resistor-programmable) allows all-ceramic-capacitor designs and minimizes external component size.

It integrates high- and low-side MOSFETs with R_DS(ON) of 26mΩ/20mΩ, supports skip mode for light-load efficiency, and includes cycle-by-cycle overcurrent protection with hiccup-mode recovery. The three-state CTL1/CTL2 inputs select one of nine factory-trimmed output voltages, eliminating need for precision feedback resistors.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Current	Continuous 6A over full -40°C to +85°C junction range - sustains full load without derating in compact thermal layout.
Input Voltage Range	2.9V to 5.5V - compatible with 3.3V and 5V intermediate bus architectures for on-board POL use.
Output Voltage Range	0.6V to 0.9 × VIN - supports DDR termination, CPU I/O, and low-voltage logic rails with ±1% accuracy.
Switching Frequency	500kHz to 2MHz (resistor-set) - enables small inductors (e.g., 0.47µH) and ceramic output capacitors only.
R_DS(ON) (HS/LS)	26mΩ / 20mΩ - reduces conduction loss at 6A, enabling >90% peak efficiency at 1.8V/5V input.
Error Amplifier BW	28MHz - permits high loop bandwidth (up to 400kHz), minimizing output capacitance for transient response.
Soft-Start Control	Capacitor-programmable via SS pin - sets monotonic ramp time to limit input inrush current during power-up.

Pinout & Package

MAX15039ETG+ is housed in a lead-free, RoHS-compliant 4mm × 4mm, 24-pin thin QFN package with exposed pad (EP) for thermal enhancement. All PGND pins (17–20) and IN pins (21–23) are internally grouped for low-impedance power routing; EP must be soldered to a large PGND copper plane.

Pin/Terminal	Circuit Role	Design Meaning
1 MODE	Functional mode selection	Configures startup behavior: GND = forced PWM, VDD/2 = skip mode with monotonic start, VDD = skip mode into prebiased output.
2 VDD	Internal 3.3V LDO output	Powers analog core; requires ≥2.2µF ceramic bypass to GND near pin for stability and noise immunity.
3,4 CTL1/CTL2	Preset output voltage selector	Three-state inputs (GND/VDD/open) set one of nine factory-trimmed outputs (0.6V–2.5V) without external resistors.
5 REFIN	External reference input	Accepts 0.6V–2.5V reference; when tied to SS, enables internal 0.6V reference and soft-start.
6 SS	Soft-start timing control	8µA current source charges external capacitor; sets controlled output ramp time to prevent input inrush.
8 COMP	Error amplifier output	Connects to FB and OUT via type III compensation network; clamped at 0.7V/2V for stability.
9 FB	Feedback input	Senses output via resistive divider or preset VID; regulates to 0.6V or applied REFIN voltage with ±1% accuracy.
10 OUT	Output sense node	Direct connection to regulated output; left unconnected when using external divider or VID programming.
11 FREQ	Frequency set resistor	Resistor to GND programs switching frequency from 500kHz to 2MHz; tolerance directly impacts f_S accuracy.
12 PWRGD	Open-drain power-good	Asserts high-Z when V_FB ≥92.5% of V_REFIN and V_REFIN >0.54V; pulls low on fault or shutdown.
13 BST	Bootstrap supply	Connected to IN via internal pMOS; requires 0.1µF ceramic capacitor to LX for high-side gate drive.
14–16 LX	Switch node	All three pins internally shorted; connects to inductor switch node; carries full AC ripple current (6A RMS).
17–20 PGND	Power ground return	Low-inductance return path for high-current LX and IN paths; must tie to EP and system PGND at single point.
21–23 IN	Main input supply	Accepts 2.9V–5.5V; requires 22µF ceramic capacitor to PGND near pins to suppress high-frequency noise.
24 EN	Enable control	Active-high logic input; drives low to reduce IN supply current to 10µA typical in shutdown mode.

Key Features

Feature	Design Value
Nine preset output voltages	0.6V, 0.7V, 0.8V, 1.0V, 1.2V, 1.5V, 1.8V, 2.0V, 2.5V - eliminates need for 0.1% feedback resistors and simplifies BOM.
Monotonic startup into prebiased outputs	Prevents reverse current flow and ensures safe power sequencing when output is already biased at startup.
Adjustable soft-start via SS pin	Capacitor-programmable ramp time avoids input rail collapse and reduces stress on input capacitors and source.
Programmable switching frequency (500kHz–2MHz)	Enables optimization of efficiency vs. size trade-off: higher f_S → smaller magnetics/caps; lower f_S → higher light-load efficiency.
Integrated high- and low-side MOSFETs	26mΩ HS / 20mΩ LS R_DS(ON) - eliminates discrete FETs and gate drivers, reducing layout complexity and footprint.
Hiccup-mode overcurrent protection	Auto-retry after 896 clock cycles upon sustained overload - prevents thermal runaway while allowing system-level fault recovery.

Applications

Server Core Voltage Regulation	DDR Memory Termination
Use Scenario: Regulating 1.2V/1.5V/1.8V core supplies for multi-core CPUs and FPGAs in 1U rack servers with tight thermal constraints. IC Role / Device Role / Timing Role: Primary synchronous buck converter delivering up to 6A with <1% output error and fast transient response to dynamic load steps. Use Value: Enables all-ceramic output design and eliminates external compensation components, reducing solution size by >30% vs. controller-based alternatives.	Use Scenario: Providing precise 1.25V or 1.5V VTT termination for DDR3/DDR4 memory subsystems requiring tight voltage tracking and low noise. IC Role / Device Role / Timing Role: Tracking regulator configured with external REFIN to follow main VDDQ rail; supports monotonic startup into prebiased VTT bus. Use Value: Achieves ±1% output accuracy without trimming resistors and maintains regulation during memory initialization sequences with no undershoot.
Telecom Baseband Power	ASIC I/O Supply
Use Scenario: Generating clean 2.5V or 3.3V I/O supplies for baseband processors in 5G small-cell radios where EMI and board space are critical. IC Role / Device Role / Timing Role: High-frequency (2MHz) POL regulator with skip mode for burst-mode traffic, minimizing standby power consumption. Use Value: Switching above AM band eliminates need for EMI filters; 4mm × 4mm QFN fits within dense RF module layouts.	Use Scenario: Powering configurable I/O banks on high-pin-count ASICs requiring multiple independent 1.8V/2.5V rails with individual enable control. IC Role / Device Role / Timing Role: Single-rail buck converter with EN pin for sequenced power-up and PWRGD for system monitoring and fault reporting. Use Value: Open-drain PWRGD provides direct interface to FPGA power management controllers; supports daisy-chained sequencing via EN/PWRGD.

Server Core Voltage Regulation

DDR Memory Termination

Use Scenario: Regulating 1.2V/1.5V/1.8V core supplies for multi-core CPUs and FPGAs in 1U rack servers with tight thermal constraints.

IC Role / Device Role / Timing Role: Primary synchronous buck converter delivering up to 6A with <1% output error and fast transient response to dynamic load steps.

Use Value: Enables all-ceramic output design and eliminates external compensation components, reducing solution size by >30% vs. controller-based alternatives.

Use Scenario: Providing precise 1.25V or 1.5V VTT termination for DDR3/DDR4 memory subsystems requiring tight voltage tracking and low noise.

IC Role / Device Role / Timing Role: Tracking regulator configured with external REFIN to follow main VDDQ rail; supports monotonic startup into prebiased VTT bus.

Use Value: Achieves ±1% output accuracy without trimming resistors and maintains regulation during memory initialization sequences with no undershoot.

Telecom Baseband Power

ASIC I/O Supply

Use Scenario: Generating clean 2.5V or 3.3V I/O supplies for baseband processors in 5G small-cell radios where EMI and board space are critical.

IC Role / Device Role / Timing Role: High-frequency (2MHz) POL regulator with skip mode for burst-mode traffic, minimizing standby power consumption.

Use Value: Switching above AM band eliminates need for EMI filters; 4mm × 4mm QFN fits within dense RF module layouts.

Use Scenario: Powering configurable I/O banks on high-pin-count ASICs requiring multiple independent 1.8V/2.5V rails with individual enable control.

IC Role / Device Role / Timing Role: Single-rail buck converter with EN pin for sequenced power-up and PWRGD for system monitoring and fault reporting.

Use Value: Open-drain PWRGD provides direct interface to FPGA power management controllers; supports daisy-chained sequencing via EN/PWRGD.

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
TPS54620RGYT	6A, 2.2MHz, 3.5V–17V input; higher VIN range but larger 5mm × 5mm QFN; no VID preset voltages.	Better suited for higher-input industrial systems; lacks CTL1/CTL2 pin-programmable outputs and monotonic prebias startup.	Select when input exceeds 5.5V or when wider VIN range is required; avoid if VID simplicity or DDR tracking is needed.
ISL85415IRZ-T7A	6A, 1MHz max, 3V–18V input; integrated compensation; no soft-start capacitor option; ±2% output accuracy.	Targeted at cost-sensitive industrial POL; lacks 28MHz error amp, skip mode, and nine preset outputs.	Choose for simpler designs where 1MHz f_S and ±2% accuracy are acceptable; not recommended for DDR or telecom applications demanding tight regulation.

Compared with TPS54620RGYT and ISL85415IRZ-T7A, the MAX15039ETG+ offers superior output accuracy (±1%), VID-based preset flexibility, monotonic prebias startup, and higher error amplifier bandwidth - making it optimal for high-performance computing and memory power where precision and sequencing reliability are critical.

Availability

MAX15039ETG+ is available at Aetrix Electronics and suitable for server power supplies, DDR memory termination, and telecom baseband POL applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MAX15039ETG+ 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 industrial, communications, and computing applications.

The MAX15039ETG+ belongs to Maxim's high-efficiency, high-frequency POL regulator product line, designed specifically for space-constrained, high-transient-response applications such as CPU cores, DDR memory, and telecom infrastructure.

FAQ

What is the maximum supported switching frequency for MAX15039ETG+?

The MAX15039ETG+ supports a programmable switching frequency range from 500kHz to 2MHz, set by an external resistor connected from the FREQ pin to GND. At RFREQ = 23.6kΩ, the typical frequency is 2MHz with ±10% variation over temperature and input voltage. This high-frequency capability enables compact magnetic and ceramic capacitor designs without sacrificing efficiency.

How does MAX15039ETG+ achieve ±1% output voltage accuracy?

The MAX15039ETG+ achieves ±1% output voltage accuracy across load, line, and temperature through factory-trimmed internal reference (0.6V), precision error amplifier offset calibration, and matched on-die resistor networks for VID programming. This specification is guaranteed over -40°C to +85°C and does not require external resistor matching - unlike standard buck controllers that rely on 0.1% external dividers.

Can MAX15039ETG+ safely start into a prebiased output voltage?

Yes, the MAX15039ETG+ supports monotonic startup into prebiased outputs when the MODE pin is configured to VDD or VDD/2. In this mode, the high-side MOSFET remains off until the output voltage falls below the target setpoint, preventing reverse current and ensuring safe sequencing - a critical feature for DDR termination and hot-swap applications.

What thermal performance can be expected from MAX15039ETG+ in a 4-layer PCB layout?

In a standard 4-layer JEDEC JESD51-7 compliant board, the MAX15039ETG+ exhibits θ_JA = 36°C/W and θ_JC = 6°C/W. With proper EP soldering to a 4cm² PGND copper area, it sustains 6A continuous output at +85°C ambient without thermal shutdown. Derating begins above 70°C ambient per the 27.8mW/°C spec.

Does MAX15039ETG+ support external voltage reference input?

Yes, the MAX15039ETG+ accepts an external reference voltage on the REFIN pin, allowing the FB node to regulate to that applied voltage (e.g., for tracking or DDR VTT). When REFIN is used, the internal 0.6V reference is disabled, and soft-start must be implemented externally - for example, by ramping REFIN with an RC network as shown in Figure 2 of the datasheet.

MAX15039ETG+ Specifications

Product attributes: Attribute value

Manufacturer:: Analog Devices Inc./Maxim Integrated

Series:: -

Package/Case:: 24-WFQFN Exposed Pad

Packaging:: Tube

Product Status:: Active

Function:: Step-Down

Output Configuration:: Positive

Topology:: Buck

Output Type:: Adjustable (Programmable)

Number of Outputs:: 1

Voltage - Input (Min):: 2.9V

Voltage - Input (Max):: 5.5V

Voltage - Output (Min/Fixed):: 0.6V (0.6V ~ 2.5V)

Voltage - Output (Max):: 4.95V

Current - Output:: 6A

Frequency - Switching:: 500kHz ~ 2MHz

Synchronous Rectifier:: Yes

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 24-TQFN (4x4)

MAX15039ETG+ FAQ

1.How can I place an order for MAX15039ETG+ through Aetrix?

Please submit a Request for Quotation (RFQ) for MAX15039ETG+ 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 MAX15039ETG+ reliable?

The price and inventory of MAX15039ETG+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX15039ETG+ is usually 5 days.

3.What payment methods are accepted for MAX15039ETG+?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX15039ETG+ transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MAX15039ETG+?

MAX15039ETG+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MAX15039ETG+ 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 MAX15039ETG+?

For technical support, including MAX15039ETG+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX15039ETG+ requirements.

6.How does Aetrix verify that MAX15039ETG+ is sourced from the original manufacturer or authorized distributors?

All MAX15039ETG+ 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 MAX15039ETG+ meets industry standards.

7.What is the process for return or replacement of MAX15039ETG+?

All MAX15039ETG+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX15039ETG+, 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 MAX15039ETG+ part is unused and in its original packaging.

Return procedure for MAX15039ETG+:

1.Submit a request within 90 days.

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

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