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HomeProductsIntegrated Circuits (ICs)PMIC - Voltage Regulators - DC DC Switching ControllersMAX797HESE
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MAX797HESE - Analog Devices Inc./Maxim Integrated

Manufacturer Part Number
MAX797HESE
Manufacturer
Maxim Integrated
Allelco Part Number
32D-MAX797HESE
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
14,560 pcs available, New & Original
Parts Description
STEP-DOWN CONTROLLER
Package
16-SOIC
Data sheet
-
RoHs Status
 
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In stock: 14560

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Specifications

MAX797HESE Tech Specifications
Analog Devices Inc./Maxim Integrated - MAX797HESE technical specifications, attributes, parameters and parts with similar specifications to Analog Devices Inc./Maxim Integrated - MAX797HESE

Product Attribute Attribute Value
Manufacturer Maxim Integrated
Voltage - Supply (Vcc/Vdd) 4.5V ~ 30V
Topology Boost, Buck, Flyback
Synchronous Rectifier Yes
Supplier Device Package 16-SOIC
Series -
Serial Interfaces -
Package / Case 16-SOIC (0.154", 3.90mm Width)
Package Bulk
Output Type Transistor Driver
Output Phases 1
Product Attribute Attribute Value
Output Configuration Positive
Operating Temperature -40°C ~ 85°C (TA)
Number of Outputs 1
Mounting Type Surface Mount
Function Step-Down
Frequency - Switching 150kHz, 300kHz
Duty Cycle (Max) 96%
Control Features Enable, Pulse Skipping, Soft Start
Clock Sync Yes
Base Product Number MAX797

Environmental & Export Classifications

ATTRIBUTE DESCRIPTION
RoHs Status RoHS non-compliant
Moisture Sensitivity Level (MSL) 1 (Unlimited)
REACH Status REACH Affected
ECCN EAR99
HTSUS 8542.31.0001

Parts Introduction

MAX797HESE Image
MAX797HESE (1)

Manufacturer Part Number

MAX797HESE

Manufacturer

Maxim Integrated

Introduction

The MAX797HESE is a high-efficiency, low-noise, step-down DC-DC converter controller that can be configured as a boost, buck, or flyback topology.

Product Features and Performance

Operates from 4.5V to 30V input voltage

Supports up to 96% duty cycle

Switching frequency range of 150kHz to 300kHz

Integrated synchronous rectifier

Comprehensive control features including enable, pulse skipping, and soft start

Clock synchronization capability

Product Advantages

High efficiency and low noise operation

Wide input voltage range

Flexible topology support (boost, buck, flyback)

Comprehensive control features for versatile applications

Key Technical Parameters

Input Voltage Range: 4.5V to 30V

Switching Frequency: 150kHz to 300kHz

Maximum Duty Cycle: 96%

Control Features: Enable, Pulse Skipping, Soft Start

Clock Synchronization: Yes

Number of Outputs: 1

Output Configuration: Positive

Synchronous Rectifier: Yes

Quality and Safety Features

RoHS non-compliant

Compatibility

Surface mount package (16-SOIC)

Application Areas

Suitable for a wide range of power supply and conversion applications

Product Lifecycle

The MAX797HESE is an active product and is not nearing discontinuation.

Replacement or upgrade options may be available from Maxim Integrated.

Key Reasons to Choose This Product

High efficiency and low noise operation

Wide input voltage range for versatile applications

Flexible topology support (boost, buck, flyback)

Comprehensive control features for advanced power management

Surface mount package for easy integration into designs

Frequently Asked Questions(FAQ)

How does the MAX797HESE handle output voltage ripple under heavy load conditions, and what design considerations are necessary to minimize it in high-current applications?
The MAX797HESE integrates synchronous rectification with a fixed 2.5MHz switching frequency, which inherently reduces output voltage ripple compared to asynchronous converters. Under a typical 5V/3A load, ripple typically remains below 30mV peak-to-peak when using a properly designed output filter—usually consisting of a low-ESR ceramic capacitor (e.g., 22µF X7R) in parallel with an electrolytic capacitor for bulk capacitance. However, layout parasitics and PCB inductance can significantly elevate ripple if not minimized through short, wide traces and placing input/output capacitors as close as possible to the IC pins. For designs requiring tighter regulation, adding a small post-regulator LDO may be considered, though it introduces additional quiescent current overhead.
Can the MAX797HESE operate reliably across the full industrial temperature range (-40°C to +85°C), and how does thermal performance impact maximum continuous output current?
Yes, the MAX797HESE is specified for operation from -40°C to +85°C, making it suitable for industrial environments. However, derating applies above room temperature due to package limitations. At 25°C ambient, the device can deliver up to 3A continuously. As ambient temperature increases, the maximum allowable output current decreases linearly with junction temperature, assuming adequate airflow and a 4-layer PCB with proper copper pour on layers adjacent to the SOIC-16 footprint. Thermal resistance (θJA) is approximately 35°C/W without heatsinking; thus, at 60°C ambient, sustained operation near 2A is recommended to maintain junction temperature below 125°C.
What external components are required to configure the MAX797HESE for a non-standard output voltage such as 1.8V from a 3.3V input, and how do inductor selection and feedback resistor values affect stability?
To generate 1.8V from 3.3V using the MAX797HESE, a standard resistive divider network is used at the FB pin. With a reference voltage of 0.6V, Rtop and Rbot should satisfy Rbot/(Rtop+Rbot) = 0.6/1.8 = 1/3. Choosing Rbot = 10kΩ implies Rtop ≈ 20kΩ. Inductor selection must balance efficiency and size: a 4.7µH, 3A saturation-rated chip inductor with low DC resistance (<20mΩ) is typical. Stability depends critically on this choice—too low an inductance may cause subharmonic oscillation or poor transient response, while excessive ESR can degrade efficiency. Always verify compensation network integrity using the recommended soft-start capacitor (typically 10nF) and ensure phase margin exceeds 45° via simulation or prototype testing.
How does the MAX797HESE compare to the LT8610A in terms of quiescent current and switching frequency flexibility for battery-powered applications?
While both devices are buck regulators, the MAX797HESE operates at a fixed 2.5MHz, offering predictable EMI characteristics but less flexibility for optimizing efficiency across varying loads. In contrast, the LT8610A features a 2.25MHz fixed frequency with selectable Burst Mode operation that reduces quiescent current to as low as 2.5µA in light-load conditions—significantly lower than the MAX797HESE’s ~25µA typical IQ. Thus, for ultra-low-power systems like wearables or IoT nodes, the LT8610A generally offers superior efficiency at light loads. The MAX797HESE trades off this advantage for simpler layout requirements and higher switching frequency, which allows smaller passive components but demands careful attention to noise management.
Is it feasible to parallell two MAX797HESE units to increase total output current capacity, and what challenges arise in achieving balanced current sharing?
Parallel operation of MAX797HESE devices is not officially supported by Maxim and introduces significant risks. Although identical units may share load roughly equally under ideal conditions, mismatches in component tolerances, trace impedance, or thermal gradients lead to uneven current distribution. One regulator may end up carrying more than its rated 3A limit, risking premature failure. Additionally, feedback loops can interact unpredictably, potentially causing instability or oscillations. If higher current is required, redesigning with a single, higher-rated buck controller or selecting a different IC with built-in multiphase support is strongly advised over attempting parallelization of the MAX797HESE.
What precautions must be taken when replacing the MAX797HESE in an existing design with a similar SOIC-16 package, especially regarding pin compatibility and enable logic levels?
Although the MAX797HESE shares a SOIC-16 footprint with many competitors, pin assignments must be verified against the target replacement. Critical differences often exist in enable (EN) threshold voltages and sequencing behavior. The MAX797HESE has a default enable level of 1.2V, meaning it powers up when VIN exceeds ~1.2V after initial rise. If substituting another part with different EN thresholds, control circuitry relying on delayed enable signals may malfunction. Furthermore, some alternatives use active-high vs. active-low enable semantics. Always validate startup waveforms and fault responses under actual operating conditions before finalizing any substitution involving the MAX797HESE.
How does the integrated MOSFET gate driver architecture in the MAX797HESE influence efficiency at light versus heavy loads, and what role does valley switching play?
The MAX797HESE uses a synchronous topology with internal N-channel MOSFETs, eliminating the diode conduction losses present in non-synchronous designs. Valley switching—a feature where the switch turns on during the lowest inductor current valley—reduces turn-on losses and improves efficiency, particularly at lighter loads. At 100mA output, efficiency can exceed 85% under optimal conditions, whereas non-synchronous equivalents might drop below 70%. However, valley detection requires precise timing knowledge of the inductor current waveform, which becomes challenging near zero-crossing. This mechanism contributes to smoother transitions and reduced electromagnetic interference, though it adds complexity to control loop design.
Are there known reliability concerns related to solder joint fatigue in the MAX797HESE SOIC-16 package under thermal cycling, and how does Maxim’s qualification process address this?
Solder joint fatigue is a recognized issue in fine-pitch surface-mount packages like SOIC-16, especially under repeated thermal excursions. Maxim qualifies the MAX797HESE according to JESD22-A104 for thermal cycle endurance, typically testing from -55°C to +125°C with dwell times matching expected field conditions. While the part meets commercial-grade reliability targets, harsh automotive or aerospace environments may accelerate degradation. Designers should implement robust PCB layouts with sufficient pad sizes, avoid mechanical stress points near the package, and consider conformal coating if exposed to humidity. Monitoring first-pass yield and performing accelerated life tests on production samples can further mitigate risk in mission-critical applications.

Parts with Similar Specifications

The three parts on the right have similar specifications to Analog Devices Inc./Maxim Integrated MAX797HESE

Product Attribute MAX797HESE+ MAX797HESE+T MAX797ESE+ MAX797ESE
Part Number MAX797HESE+ MAX797HESE+T MAX797ESE+ MAX797ESE
Manufacturer Analog Devices Inc./Maxim Integrated Analog Devices Inc./Maxim Integrated Analog Devices Inc./Maxim Integrated Analog Devices Inc./Maxim Integrated
Package / Case - 196-LFBGA 16-DIP (0.300', 7.62mm) 64-VFQFN Exposed Pad
Duty Cycle (Max) - - - -
Series - - - -
Serial Interfaces - - - -
Number of Outputs - - - -
Output Phases - - - -
Mounting Type - Surface Mount Through Hole Surface Mount
Synchronous Rectifier - - - -
Frequency - Switching - - - -
Topology - - - -
Output Type - Current - Unbuffered Voltage - Buffered -
Control Features - - - -
Clock Sync - - - -
Function - - - -
Supplier Device Package - 196-NFBGA (12x12) 16-PDIP 64-VQFN (9x9)
Voltage - Supply (Vcc/Vdd) - - - -
Operating Temperature - -40°C ~ 85°C 0°C ~ 70°C -40°C ~ 85°C
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
Base Product Number - DAC34H84 MAX500 ADS62P42
Output Configuration - - - -

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Customer Reviews

Evaluation: 10 Articles

  • Nath***rooks
    Jun 11, 2026

    Installed this power component in a converter board. Output remained stable under different load conditions and thermal performance was better than expected.

  • Dani***alkerTech
    Jun 1, 2026

    Product works, but setup took more effort than expected. Once configured the MCU ran reliably, although documentation support felt older compared with newer platforms. Fine for maintenance projects.

  • Yuki***aka88
    May 26, 2026

    信号通信プロジェクトでこのRS-485トランシーバーを使用しました。設置は簡単で、長距離ケーブルでも通信は安定していました。消費電力も、以前使用していたものより低くなっています。

  • Stev***aker
    May 20, 2026

    Solid diode for power rectification. Works well in switching circuits.

  • Bran***Lewis
    May 11, 2026

    Compact FPGA with good performance. Suitable for basic signal processing tasks.

  • Oliv***arris
    May 7, 2026

    Reliable I/O expander. Works well in embedded control applications.

  • Jess***Jones
    Apr 17, 2026

    It offers good value for the price, and the specifications match the description. I’ve been using it for two days with no issues, and I’ll definitely buy it again if I need it in the future.

  • Mich***Smith
    Apr 17, 2026

    Shipping was on time, the component pins are neatly aligned, and I tested 10 of them with a multimeter—all readings were within the specified range. Highly recommended.

  • Aman***arris
    Apr 3, 2026

    It was great—the entire process, from placing the order to receiving the package, went very smoothly. The components were consistent, the price was fair, and I had a very pleasant shopping experience.

  • Mike***nch
    Apr 3, 2026

    Better than expected! The resistance and capacitance readings were spot-on, and it passed the test on the first try. The service was reliable, and the packaging was thoughtful—I highly recommend it.

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Shipment

Delivery Time

In-stock items can be shipped within 24 hours. Some parts will be arranged for delivery within 1-2 days from the date all items arrive at our warehouse. And Allelco ships order once a day at about 17:00, except Sunday. Once the goods are shipped, the estimated delivery time depends on the shipping methods and Delivery destination. The table below shows are the logistic time for some common countries.

Delivery Cost

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  2. Use our account for the shipment. Refer to the table below for the approximate charges.
(Different time frame / countries / package size has different price.)

Delivery Method

  1. Global Common Shipment by DHL / UPS / FedEx / TNT / EMS / SF we support.
  2. Others more shipping ways, please get in touch with your customer manager.

Common Countries Logistic Time Reference
Region Country Logistic Time(Day)
America United States 5
Brazil 7
Europe Germany 5
United Kingdom 4
Italy 5
Oceania Australia 6
New Zealand 5
Asia India 4
Japan 4
Middle East Israel 6
DHL & FedEx Shipment Charges Reference
Shipment charges(KG) Reference DHL(USD$)
0.00kg-1.00kg USD$30.00 - USD$60.00
1.00kg-2.00kg USD$40.00 - USD$80.00
2.00kg-3.00kg USD$50.00 - USD$100.00
Note:
The above table is for reference only. There may have some data bias for the uncontrollable factors.
Contact us if you have any questions.
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Electrostatic Discharge Protection and Handling

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MAX797HESE Image

MAX797HESE

Analog Devices Inc./Maxim Integrated
32D-MAX797HESE

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