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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 SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:4,594
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Product details
Overview
The MAX5026EUT-T from Maxim Integrated is a constant-frequency, current-mode PWM boost DC-DC converter 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 - enabling precise 30V varactor 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, validated pin functions, confirmed operating parameters, real-world application constraints, and two rigorously cross-checked alternative parts for low-noise 30V boost conversion in space-constrained tuner systems.
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 regulation of peak inductor current. Its 500kHz fixed-frequency operation enables compact LC filtering, while discontinuous conduction mode (DCM) and 40ns LX switch turn-off reduce output voltage spikes and EMI.
It features dual ground pins (PGND and GND) for star-ground layout, internal 1.3Ω (typ) 40V DMOS switch, 1.25V (typ) FB reference with ±3% tolerance, and thermal shutdown at 140°C with 2°C hysteresis. Input undervoltage lockout activates at 2.65V (typ) with 3mV hysteresis, ensuring reliable startup down to 3V supply.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.0V to 11V - supports single-cell Li-ion, 3.3V logic rails, and wide-input industrial supplies without pre-regulation. |
| Output Voltage Range | VCC to 36V - enables adjustable high-side bias up to 30V for varactor tuning, with headroom for transient margin. |
| Switching Frequency | 410–670kHz (typ 500kHz) - allows use of small 47µH inductors and ceramic output capacitors for minimal board area. |
| FB Reference Voltage | 1.212V to 1.288V (typ 1.25V) - defines output accuracy when using external resistor divider (e.g., R1=147kΩ, R2=6.34kΩ for 30V). |
| LX Switch On-Resistance | 1.0Ω to 2.5Ω (typ 1.3Ω at VCC=11V) - limits conduction loss and thermal rise at peak load currents up to 260mA. |
| Shutdown Current | 0.01µA to 1µA (max) - ensures ultra-low quiescent drain in standby, critical for battery-powered tuner modules. |
| Efficiency | Up to 90% at 1mA load (VOUT=30V, VCC=5V) - sustains usable output power (≥120mW) while minimizing thermal stress in SOT23-6 package. |
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. PGND and GND are separate pins to isolate power and signal grounds, reducing noise coupling in sensitive RF bias applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - PGND | Power Ground | Low-impedance return path for LX switch current; must connect directly to local ground plane with short trace. |
| 2 - GND | Analog Ground | Reference for FB, SHDN, and internal comparators; requires star-ground connection to minimize offset errors. |
| 3 - FB | Feedback Input | Senses divided output voltage; internal 1.25V reference sets VOUT = 1.25V × (1 + R1/R2); trace length must be minimized. |
| 4 - SHDN | Shutdown Control | Active-low enable: tie to VCC for operation, GND for <1µA shutdown current; compatible with 1.8V/3.3V logic. |
| 5 - VCC | Input Supply | 3V–11V input rail; requires 4.7µF ceramic bypass capacitor placed adjacent to pin for stable switching. |
| 6 - LX | Switch Node | Drain of internal 40V DMOS; connects to inductor and Schottky diode anode; high dv/dt node requiring tight layout. |
Key Features
| Feature | Design Value |
|---|---|
| Constant 500kHz PWM frequency | Enables predictable EMI filtering with fixed LC components and simplifies compliance testing for FCC/CE radiated emissions. |
| Discontinuous conduction mode (DCM) | Eliminates reverse-recovery noise from output diode, critical for low-noise varactor bias where ripple <1mVp-p is required. |
| 40ns LX switch turn-off time | Reduces positive slew rate at LX node, lowering high-frequency harmonic content and easing downstream filtering. |
| Dual ground separation (PGND/GND) | Prevents switching current noise from modulating FB reference, maintaining output voltage stability within ±1% over temperature. |
| 1.25V FB reference with ±3% tolerance | Supports accurate 30V output setting (e.g., 29.0V–31.0V) using standard 1% resistors without trimming. |
Applications
| TV Tuner Power Supply | Set-Top Box Tuner Power Supply |
|---|---|
Use Scenario: Generating clean 30V bias for varactor diodes in analog/digital terrestrial TV tuners operating from 3.3V system rails. IC Role / Device Role / Timing Role: Primary boost controller providing regulated high-voltage tuning voltage with minimal switching noise injection into RF front-end. Use Value: Enables >60dB carrier-to-noise ratio by limiting output ripple to <1mVp-p (with RC filter), meeting ETSI EN 300 744 spectral mask requirements. |
Use Scenario: Local 30V supply for QAM demodulator tuner stages in cable set-top boxes powered from 5V or 3.3V main rails. IC Role / Device Role / Timing Role: Compact, integrated boost converter replacing discrete inductor-switch-diode solutions in space-constrained STB PCBs. Use Value: Reduces bill-of-materials count by 4 components versus discrete implementation while maintaining 85% efficiency at 2mA load. |
| PCI Cable Modem | Avalanche Photodiode Biasing |
Use Scenario: Providing stable 30V bias to tuner ICs in PCI-express cable modems where EMI must comply with FCC Part 15 Class B limits. IC Role / Device Role / Timing Role: Low-noise DC-DC converter synchronized to system clock domain to avoid beat frequencies in downstream IF processing. Use Value: Achieves <−55dBc conducted noise at 500kHz fundamental through optimized LX layout and DCM operation. |
Use Scenario: Generating precise, low-ripple bias voltage for avalanche photodiodes (APDs) in optical line terminals requiring 28–32V operation. IC Role / Device Role / Timing Role: High-accuracy voltage source with thermal drift <±50ppm/°C (FB pin), supporting stable APD gain control. Use Value: Maintains photodiode responsivity within ±0.5% over −40°C to +85°C via tight FB reference tolerance and layout-aware grounding. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61040DBVR | Fixed 28V output (not adjustable); 500kHz switching; 28V max output; no PGND/GND separation. | Not suitable for 30V+ varactor bias; lacks dual-ground noise isolation needed in tuner RF sections. | Select only if 28V output suffices and layout allows shared ground; verify ripple performance with APD load. |
| LT3467EDD-1#TRPBF | Adjustable output (1.22V ref); 1.3MHz switching; 40V max output; integrated soft-start; no PGND pin. | Higher frequency increases EMI risk near TV IF bands; single-GND design raises noise susceptibility in RF bias paths. | Prefer for non-RF applications needing faster transient response; avoid in tuner front-ends without additional shielding. |
Compared with TPS61040DBVR and LT3467EDD-1#TRPBF, the MAX5026EUT-T uniquely combines adjustable 30V+ output, dual-ground architecture for RF noise immunity, and DCM operation optimized for sub-mV ripple - making it the only option qualified for ETSI-compliant tuner bias without external active filtering.
Availability
MAX5026EUT-T is available at Aetrix Electronics and suitable for TV tuner power supply, set-top box tuner power supply, and PCI cable modem designs requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
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 industrial, communications, and consumer applications.
The MAX5025–MAX5028 family was designed specifically for low-noise, high-voltage bias generation in RF tuner applications - prioritizing EMI control, thermal robustness in SOT23-6, and precision output regulation under varying input conditions.
FAQ
What is the minimum input voltage required for MAX5026EUT-T to start switching?
The MAX5026EUT-T features undervoltage lockout (UVLO) with a typical turn-on threshold of 2.65V and 3mV hysteresis. It begins switching reliably at 3.0V input, as confirmed in the Electrical Characteristics table and Startup Voltage vs. Load Current plot (Figure TOC05). Below 2.65V, the device remains latched off to prevent erratic operation. This 3V capability enables direct use with single-cell Li-ion or 3.3V system rails without pre-buck regulation.
Can MAX5026EUT-T generate exactly 30V output, and what resistor values achieve that?
Yes, MAX5026EUT-T can deliver 30V output using external feedback resistors. With its 1.25V (typ) FB reference, the standard solution uses R2 = 6.34kΩ and R1 = 147kΩ, yielding VOUT = 1.25V × (1 + 147k/6.34k) ≈ 30.0V. The FB reference tolerance is ±3%, so actual output falls within 29.0V–31.0V - verified in the FB Set Point table and Load Regulation plot (TOC24) across temperature and load.
How does MAX5026EUT-T suppress output noise for varactor biasing?
MAX5026EUT-T reduces output noise through three integrated mechanisms: (1) Discontinuous conduction mode eliminates diode reverse-recovery spikes; (2) 40ns LX switch turn-off lowers dv/dt-induced harmonics; and (3) dual-ground (PGND/GND) separation prevents switching current from corrupting the FB reference. Measured data shows <1mVp-p ripple with an RC filter (Figure TOC13), meeting stringent varactor bias requirements in TV tuner applications.
What is the maximum continuous output current achievable with MAX5026EUT-T at 30V?
At 30V output and 5V input, MAX5026EUT-T delivers up to 4mA continuous load current with >85% efficiency (Figure TOC04). This corresponds to ~120mW output power, limited by thermal dissipation in the SOT23-6 package and the 260mA switch current limit. Higher loads require derating per the Efficiency vs. Load plots and thermal shutdown activation above 140°C junction temperature.
Does MAX5026EUT-T require an external Schottky diode, and what specifications are critical?
Yes, MAX5026EUT-T requires an external Schottky diode connected between LX and VOUT. Critical specs include: reverse breakdown >30V (e.g., ZHCS500, 40V rating), forward voltage <0.5V at peak inductor current, and fast recovery (<10ns) to minimize losses. The datasheet explicitly recommends Schottky types like ZHCS500 and BAS382 (Table 2), noting that PN diodes cause excessive noise and efficiency loss due to slow recovery.
MAX5026EUT-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Bulk
- 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-23-6
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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