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Analog Devices Inc./Maxim Integrated MAX5026EUT+T
- Part No.:
- MAX5026EUT+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SOT-23-6
- Datasheet:
-
MAX5026EUT+T.pdf
- Description:
- IC REG BOOST ADJ 260MA SOT6
- Quantity:
- Payment:
- Shipping:
Inventory:6,864
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Product details
Overview
MAX5026EUT+T from Maxim Integrated is a constant-frequency, current-mode PWM boost DC-DC converter IC designed for low-noise, high-voltage bias generation in tuner front-ends. It operates from 3V to 11V input, delivers up to 36V output, switches at 500kHz (typ), integrates a 40V lateral DMOS power switch, and supports user-adjustable output voltage via external feedback resistors - ideal for varactor diode biasing in TV tuners and set-top boxes.
For engineers reviewing the MAX5026EUT+T datasheet, MAX5026EUT+T pinout, MAX5026EUT+T application, or MAX5026EUT+T equivalent, this page provides verified technical context, confirmed pin functions, real-world load regulation and efficiency behavior, validated alternative options, and supply-chain support details specific to the MAX5026EUT+T SOT23-6 package.
Technical Context
The MAX5026EUT+T implements a BiCMOS current-mode PWM architecture with direct-summing comparator control-eliminating traditional error amplifier phase shift for cycle-by-cycle output regulation. Its 500kHz fixed-frequency operation enables predictable EMI filtering and stable light-load performance in discontinuous conduction mode.
It features an internal 1.3Ω (typ), 40V-rated N-channel DMOS switch, 1.25V ±3% FB reference voltage, and thermal shutdown at 140°C with 2°C hysteresis. The device uses separate PGND and GND pins to isolate power and signal ground paths, minimizing noise coupling into the feedback node.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.0V to 11V - enables direct operation from single Li-ion or 3.3V/5V system rails without pre-regulation. |
| Output Voltage Range | VCC to 36V - supports adjustable high-voltage biasing up to 36V using external resistor divider on FB pin. |
| Switching Frequency | 410–670kHz (typ 500kHz) - ensures compact magnetics and predictable EMI profile for FCC/CE-compliant designs. |
| FB Reference Voltage | 1.212V to 1.288V (±3%) - defines output accuracy when setting VOUT = VREF × (1 + R1/R2); tight tolerance reduces calibration overhead. |
| Shutdown Current | 0.01µA to 1µA (max) - enables ultra-low-power standby in battery-powered tuners and cable modems. |
| LX On-Resistance | 1.0Ω to 2.5Ω (at VCC = 11V) - determines conduction loss and thermal rise under 4mA load; impacts efficiency above 12V output. |
| Max Output Power | 120mW - constrains usable load current at high VOUT (e.g., ~3.3mA at 36V), defining practical biasing capability. |
Pinout & Package
MAX5026EUT+T is housed in a thermally enhanced 6-pin SOT23-6 package (package code S8-2), with exposed pad not electrically connected. Pin 1 is PGND - power ground for LX return path; Pin 2 is GND - analog/signal ground; Pin 3 is FB - feedback input referenced to 1.25V; Pin 4 is SHDN - active-low enable; Pin 5 is VCC - input supply; Pin 6 is LX - switched drain node driving external inductor/diode.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (PGND) | Power Ground | High-current return path for LX switch; must connect directly to local ground plane with low-inductance trace to minimize switching noise. |
| 2 (GND) | Analog Ground | Reference for FB, SHDN, and internal circuitry; requires star-ground connection separate from PGND to avoid noise injection. |
| 3 (FB) | Feedback Input | Senses output voltage via resistor divider; 1.25V reference enables precise VOUT = 1.25 × (1 + R1/R2); trace must be short and shielded. |
| 4 (SHDN) | Shutdown Control | Active-low logic input; <0.8V disables switching and reduces ICC to ≤1µA; >2.4V enables normal operation. |
| 5 (VCC) | Supply Input | 3V–11V input rail; requires 4.7µF ceramic bypass capacitor placed adjacent to pin to suppress supply ripple and transients. |
| 6 (LX) | Switch Drain | Drain of internal 40V DMOS FET; connects to inductor and Schottky diode anode; high dv/dt node requiring minimized trace area. |
Key Features
| Feature | Design Value |
|---|---|
| Constant 500kHz PWM frequency | Enables consistent EMI filtering design and predictable inductor sizing; avoids variable-frequency noise spread in sensitive RF sections. |
| Discontinuous conduction mode (DCM) | Eliminates reverse-recovery spike from output diode, reducing output voltage overshoot and easing compliance with low-noise tuner requirements. |
| Separate PGND and GND pins | Prevents high di/dt switching currents from corrupting FB sensing and internal reference - critical for <1% output regulation stability. |
| 40ns typical LX turn-off time | Reduces positive slew rate at LX node, lowering radiated EMI and limiting inductive kick that stresses output capacitor and diode. |
| Thermal shutdown with 2°C hysteresis | Protects against sustained overload or poor PCB thermal design; automatic recovery prevents latch-up during transient overloads. |
Applications
| TV Tuner Varactor Bias | Set-Top Box Tuner Supply |
|---|---|
|
Use Scenario: Generating stable 30V bias for varactor diodes in terrestrial/cable TV tuner front-ends where RF signal integrity is paramount. IC Role / Device Role / Timing Role: Step-up DC-DC controller providing regulated high-voltage bias; operates in DCM to suppress switching artifacts near RF bands. Use Value: Achieves <1mVp-p output ripple with RC filter (Fig.3), meeting stringent tuner SNR requirements without additional LDO post-regulation. |
Use Scenario: Local high-voltage supply for QAM demodulator and tuner ICs in consumer set-top boxes operating from 3.3V or 5V main rails. IC Role / Device Role / Timing Role: Compact, integrated boost converter replacing discrete charge-pump or transformer-based solutions; 500kHz switching avoids interference with video clock harmonics. Use Value: Delivers 30V @ 4mA from 3V input with >70% efficiency (Fig. toc04), enabling single-rail power architecture and reducing BOM count by 3+ components. |
| PCI Cable Modem Tuner | Avalanche Photodiode Bias |
|
Use Scenario: Biasing varactor-tuned filters in DOCSIS-compliant cable modems where EMI must comply with FCC Part 15 Class B limits. IC Role / Device Role / Timing Role: Low-noise boost controller with controlled LX edge rates; used with Schottky diode and ferrite-core inductor per layout guidelines. Use Value: Meets conducted emissions targets without shielding due to DCM operation and 40ns LX fall time - verified in typical circuits (Fig.2/Fig.3). |
Use Scenario: Providing precise, low-ripple bias voltage (24–36V) for avalanche photodiodes in optical receivers and fiber test equipment. IC Role / Device Role / Timing Role: Adjustable high-voltage generator with tight FB reference (±3%) and low temperature drift (<0.5mV/°C) for stable gain control. Use Value: Maintains <±0.5% output stability over -40°C to +85°C (toc20/toc21), eliminating need for external trimming in production calibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX5028EUT+T | Fixed 30V output; same 3V–11V input range and 500kHz switching; FB pin internally connected to output divider. | No external resistors needed; eliminates tuning but reduces flexibility for non-30V bias points. | Select when 30V is fixed requirement and board space for R1/R2 is constrained; identical footprint and thermal behavior. |
| TPS61040DBVR | 28V max output; 500kHz switching; 1.24V FB reference; integrated 5.5Ω switch; higher quiescent current (55µA vs. 350µA typ). | Lower max output limits use in >28V APD or tuner applications; less efficient above 15V due to higher RDS(on). | Consider for cost-sensitive, lower-voltage (<25V) biasing where 36V headroom is unnecessary; requires different compensation network. |
Compared with MAX5026EUT+T, MAX5028EUT+T simplifies design for fixed 30V use but sacrifices adjustability, while TPS61040DBVR offers TI's support ecosystem but trades off output voltage range and efficiency at high VOUT - making MAX5026EUT+T optimal for 30–36V, low-noise, space-constrained tuner biasing.
Availability
MAX5026EUT+T is available at Aetrix Electronics and suitable for TV tuner power supplies, set-top box tuner supplies, and PCI cable modem applications requiring stable component supply across industrial temperature ranges (-40°C to +85°C) and long-lifecycle production programs.
Supply support for MAX5026EUT+T 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 U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for precision, reliability-critical systems.
The MAX5025–MAX5028 family was engineered specifically for low-noise, high-voltage bias generation in RF tuner modules - prioritizing EMI control, thermal robustness, and compact integration in space-limited consumer and broadband equipment.
FAQ
What is the minimum input voltage required for MAX5026EUT+T to start switching?
The MAX5026EUT+T features undervoltage lockout (UVLO) with a rising threshold of 2.65V and 3mV hysteresis. It begins switching only when VCC rises above 2.65V and remains enabled down to 2.25V. Below 2.25V, the device shuts down completely. This ensures reliable startup from weak or partially discharged batteries in portable tuner applications, and the MAX5026EUT+T maintains regulation stability across its full 3V–11V operating range once enabled.
Can MAX5026EUT+T generate output voltages higher than 30V?
Yes, the MAX5026EUT+T supports output voltages from VCC up to 36V using external feedback resistors on the FB pin. Its FB reference is 1.25V ±3%, so VOUT = 1.25 × (1 + R1/R2). For example, with R2 = 6.34kΩ and R1 = 147kΩ, it achieves 30V; scaling R1 upward yields 32V or 36V outputs. However, maximum load current decreases as VOUT increases - e.g., ~2mA at 36V - due to internal switch current limit and efficiency roll-off, as confirmed in Figure toc25 of the datasheet for the MAX5026EUT+T.
How does MAX5026EUT+T achieve low output noise compared to standard boost converters?
The MAX5026EUT+T achieves low output noise through three integrated techniques: (1) operation in discontinuous conduction mode (DCM) to eliminate diode reverse-recovery spikes; (2) controlled 40ns LX turn-off time to reduce dv/dt-induced EMI; and (3) separate PGND/GND pins to prevent switching noise from modulating the FB reference. These features allow the MAX5026EUT+T to achieve <1mVp-p ripple with an RC filter (Fig.3), meeting stringent RF tuner noise specifications without added LDO stages.
What is the recommended inductor value for MAX5026EUT+T in a 30V output application?
The datasheet specifies 47µH as the recommended inductor value for 30V output with 5V input, using a ferrite-core type (e.g., Toko A915BY-470M). This value balances size, efficiency (>70% at 4mA), and noise performance. Inductor current rating must exceed the switch current limit - which is input-voltage dependent (e.g., ~200mA at 5V input). Powdered iron cores are explicitly discouraged due to excessive losses above 500kHz. Layout must avoid copper under the inductor to prevent eddy-current losses, as detailed in the MAX5026EUT+T application notes.
Does MAX5026EUT+T require an external Schottky diode, and what are key selection criteria?
Yes, MAX5026EUT+T requires an external Schottky diode connected between LX and VOUT. Key selection criteria include: peak current rating ≥ calculated ILPEAK (e.g., >200mA for 4mA/30V output), reverse breakdown voltage > VOUT (e.g., ≥40V), and fast recovery (<50ns) to minimize switching loss. Recommended parts include Zetex ZHCS500 and Vishay BAS382 - both validated in the MAX5026EUT+T typical circuits. Standard PN diodes are unsuitable due to slow recovery and increased noise.
MAX5026EUT+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Up
- Output Configuration:
- Positive
- Topology:
- Boost
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3V
- Voltage - Input (Max):
- 11V
- Voltage - Output (Min/Fixed):
- 3V
- Voltage - Output (Max):
- 36V
- Current - Output:
- 260mA (Switch)
- Frequency - Switching:
- 500kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-6
MAX5026EUT+T FAQ
1.How can I place an order for MAX5026EUT+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX5026EUT+T 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 MAX5026EUT+T reliable?
The price and inventory of MAX5026EUT+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX5026EUT+T is usually 5 days.
3.What payment methods are accepted for MAX5026EUT+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX5026EUT+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX5026EUT+T?
MAX5026EUT+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX5026EUT+T 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 MAX5026EUT+T?
For technical support, including MAX5026EUT+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX5026EUT+T requirements.
6.How does Aetrix verify that MAX5026EUT+T is sourced from the original manufacturer or authorized distributors?
All MAX5026EUT+T 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 MAX5026EUT+T meets industry standards.
7.What is the process for return or replacement of MAX5026EUT+T?
All MAX5026EUT+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX5026EUT+T, 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 MAX5026EUT+T part is unused and in its original packaging.
Return procedure for MAX5026EUT+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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