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Analog Devices Inc./Maxim Integrated MAX5028EUT+
- Part No.:
- MAX5028EUT+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SOT-23-6
- Datasheet:
-
MAX5028EUT+.pdf
- Description:
- IC REG BST FLYBCK 30V 260MA SOT6
- Quantity:
- Payment:
- Shipping:
Inventory:1,272
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Product details
Overview
MAX5028EUT+ from Maxim Integrated is a fixed-output, constant-frequency PWM boost DC-DC converter optimized for low-noise varactor diode biasing in TV tuners and set-top boxes. It delivers a precise 30V output from a 3V–11V input, switches at 500kHz (typ), integrates a 40V lateral DMOS power switch, and operates in discontinuous conduction mode to minimize output voltage spikes.
For engineers reviewing the MAX5028EUT+ datasheet, MAX5028EUT+ pinout, MAX5028EUT+ application, or MAX5028EUT+ equivalent, this page provides verified electrical parameters, validated SOT23-6 pin mapping, confirmed 30V fixed-output behavior, thermal shutdown protection at 140°C, and real-world design constraints for high-voltage bias supply implementation.
Technical Context
The MAX5028EUT+ employs a current-mode PWM architecture with direct-summing comparator control-eliminating traditional error amplifier phase shift-to achieve cycle-by-cycle regulation of peak inductor current. Its internal 40V DMOS switch and 1.3Ω (typ) on-resistance enable efficient 30V boost conversion up to 36V output.
Discontinuous conduction mode operation, combined with 40ns typical LX switch turn-off time, reduces high-frequency switching noise and simplifies EMI filtering. The FB pin is internally connected to generate a fixed 30V output without external resistors, differing fundamentally from adjustable variants (MAX5025/MAX5026) that require feedback dividers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 30V ±3% (guaranteed over -40°C to +85°C; enables direct varactor bias without resistor network) |
| Input Voltage Range | 3.0V to 11.0V (supports single-cell Li-ion, 3.3V/5V rails; lower 3V start enables battery-powered tuner modules) |
| Switching Frequency | 500kHz typical (±34% tolerance; enables compact 47µH inductor and small ceramic filter caps) |
| Internal Switch | 40V lateral DMOS with 1.3Ω typical RON (supports up to 36V output; eliminates need for external MOSFET) |
| Shutdown Current | 1µA maximum (enables ultra-low-power standby in cable modem tuner sections) |
| Thermal Shutdown | 140°C with 2°C hysteresis (protects against sustained overload in enclosed STB enclosures) |
| FB Pin Voltage | 30V nominal (internally divided; no external feedback required-distinct from MAX5025/MAX5026's 1.25V reference) |
Pinout & Package
MAX5028EUT+ is housed in a thermally enhanced 6-pin SOT23 package (S8-2 land pattern), with PGND and GND pins separated to isolate high-current power ground from sensitive analog ground-critical for low-noise bias generation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - PGND | Power Ground | High-current return path for LX switch; must connect directly to local ground plane via short, wide trace |
| 2 - GND | Analog Ground | Reference for internal comparators and FB circuitry; star-grounded separately from PGND to prevent noise coupling |
| 3 - FB | Feedback Input | Internally tied to 30V output divider; no external components needed-unlike adjustable variants requiring R1/R2 |
| 4 - SHDN | Shutdown Control | Active-low logic input; <0.8V disables switching and reduces ICC to ≤1µA; >2.4V enables operation |
| 5 - VCC | Supply Input | 3V–11V input rail; requires 4.7µF ceramic bypass capacitor placed adjacent to pin |
| 6 - LX | Switch Drain | Drain of internal 40V DMOS; connects to boost inductor and Schottky diode anode; minimize trace area to reduce EMI |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 30V Output | Eliminates external feedback resistors-reducing BOM count, layout area, and resistor tolerance-induced output drift |
| Discontinuous Conduction Mode | Prevents diode reverse-recovery voltage spikes at output, enabling cleaner bias for sensitive RF tuning circuits |
| 500kHz Constant-Frequency PWM | Allows predictable EMI filtering with small LC components; avoids variable-frequency noise spreading across spectrum |
| Separate PGND/GND Pins | Enables star-ground isolation between high-di/dt power paths and precision feedback circuitry-critical for sub-mV ripple |
| 1.3Ω Internal Switch RON | Reduces conduction loss at 4mA load (typical tuner bias current), improving efficiency vs. discrete FET solutions |
Applications
| TV Tuner Power Supply | Set-Top Box Tuner Power Supply |
|---|---|
Use Scenario: Generating stable 30V bias for varactor diodes in terrestrial/cable TV tuner front-ends. IC Role / Device Role / Timing Role: Fixed-output boost controller providing regulated high-voltage bias without trimming or calibration. Use Value: 30V ±3% accuracy ensures consistent channel tuning range; DCM operation suppresses switching artifacts near RF bands. |
Use Scenario: Local 30V supply for QAM demodulator tuner ICs in digital cable STBs operating from 3.3V system rails. IC Role / Device Role / Timing Role: Compact, integrated boost converter replacing discrete inductor/FET/diode solutions in space-constrained STB PCBs. Use Value: SOT23-6 footprint saves >60% board area vs. discrete alternatives; 1µA shutdown supports deep-sleep modes. |
| PCI Cable Modem Tuner | Avalanche Photodiode Biasing |
Use Scenario: High-voltage bias for tuner modules in PCI-based DOCSIS cable modems powered from 3.3V PCIe slots. IC Role / Device Role / Timing Role: Efficient step-up regulator delivering 30V from low-voltage host interface, with fast transient response to signal lock events. Use Value: 500kHz switching allows use of miniature 47µH shielded inductors; PGND/GND separation maintains SNR in analog RF section. |
Use Scenario: Precision bias supply for avalanche photodiodes (APDs) in optical receivers requiring stable 30V with low ripple. IC Role / Device Role / Timing Role: Low-noise DC-DC converter where output ripple directly impacts APD gain stability and dark current. Use Value: Discontinuous mode + 40ns LX turn-off reduces high-frequency ripple; RC filter option achieves <1mVp-p output noise. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-output boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61040DBVR | Adjustable output (1.8V–28V); 5V max input; 500kHz fixed frequency; no internal 40V switch-requires external FET | Requires external MOSFET and feedback resistors; unsuitable for 30V fixed output without redesign | Select only if output voltage flexibility and lower input voltage (down to 1.8V) outweigh need for integration and 30V precision. |
| LT3467EDD#TRPBF | Fixed 28V output; 3V–20V input; 1.2MHz switching; integrated 40V switch; different pinout (8-pin DFN) | Higher switching frequency enables smaller magnetics but increases EMI risk in RF-sensitive tuner zones | Choose when board space permits DFN package and 28V (vs. 30V) output is acceptable for varactor bias point. |
Compared with TPS61040DBVR and LT3467EDD#TRPBF, MAX5028EUT+ uniquely combines true 30V fixed output, 3V–11V input compatibility, SOT23-6 footprint, and PGND/GND separation-making it the only drop-in solution for legacy tuner designs requiring minimal layout change and guaranteed 30V accuracy.
Availability
MAX5028EUT+ is available at Aetrix Electronics and suitable for TV tuner power supplies, set-top box tuner modules, and PCI cable modem RF sections requiring stable component supply, long-term lifecycle support, and guaranteed parametric compliance over industrial temperature range (-40°C to +85°C).
Supply support for MAX5028EUT+ 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 industrial, communications, and consumer applications.
The MAX5025–MAX5028 family was designed specifically for low-noise, high-voltage bias generation in RF tuner systems-addressing the need for compact, fixed-output boost converters with integrated 40V switches and discontinuous-mode operation.
FAQ
What is the exact output voltage tolerance of the MAX5028EUT+ over temperature?
The MAX5028EUT+ guarantees a 30V output with ±3% tolerance over the full -40°C to +85°C operating range, as confirmed by Electrical Characteristics table data (VFB = 29.0V to 31.0V). This tight tolerance is achieved through internal laser-trimmed resistive division and is independent of external components-unlike adjustable variants such as MAX5026.
Can the MAX5028EUT+ operate from a 2.8V input supply?
No, the MAX5028EUT+ has a minimum input voltage of 3.0V per Absolute Maximum Ratings and Electrical Characteristics tables. Operation below 3.0V risks failure to start or erratic regulation; undervoltage lockout activates at 2.25V (min), but reliable startup requires ≥3.0V. For sub-3V systems, consider MAX5026EUT+ (3.0V min) with external feedback.
Does the MAX5028EUT+ require an external feedback resistor network?
No, the MAX5028EUT+ features an internally configured feedback path for fixed 30V output-pin 3 (FB) is pre-connected to the output divider. Unlike MAX5025/MAX5026, no external R1/R2 resistors are needed, eliminating associated tolerance errors and layout sensitivity. This is explicitly stated in the Pin Description and Applications Information sections.
What is the maximum continuous output current supported by the MAX5028EUT+?
The MAX5028EUT+ supports up to 4mA continuous output current at 30V when operating from 5V input, as validated in Typical Operating Characteristics (Figure toc25) and Design Procedure section. At higher loads, the internal 260mA switch current limit (function of input voltage) and thermal limits constrain usable current-designs exceeding 4mA require careful thermal analysis and derating.
How does the MAX5028EUT+ reduce output noise compared to standard boost converters?
The MAX5028EUT+ reduces output noise through three verified mechanisms: (1) discontinuous conduction mode prevents diode reverse-recovery spikes; (2) 40ns typical LX switch turn-off time lowers dV/dt and reduces high-frequency ringing; and (3) separate PGND/GND pins enable star-ground isolation of power and analog paths-documented in Layout Considerations and Typical Operating Characteristics waveforms.
MAX5028EUT+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Function:
- Step-Up, Step-Up/Step-Down
- Output Configuration:
- Positive
- Topology:
- Boost, Flyback, SEPIC
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3V
- Voltage - Input (Max):
- 11V
- Voltage - Output (Min/Fixed):
- 30V
- Voltage - Output (Max):
- -
- 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
MAX5028EUT+ FAQ
1.How can I place an order for MAX5028EUT+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX5028EUT+ 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 MAX5028EUT+ reliable?
The price and inventory of MAX5028EUT+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX5028EUT+ is usually 5 days.
3.What payment methods are accepted for MAX5028EUT+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX5028EUT+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX5028EUT+?
MAX5028EUT+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX5028EUT+ 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 MAX5028EUT+?
For technical support, including MAX5028EUT+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX5028EUT+ requirements.
6.How does Aetrix verify that MAX5028EUT+ is sourced from the original manufacturer or authorized distributors?
All MAX5028EUT+ 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 MAX5028EUT+ meets industry standards.
7.What is the process for return or replacement of MAX5028EUT+?
All MAX5028EUT+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX5028EUT+, 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 MAX5028EUT+ part is unused and in its original packaging.
Return procedure for MAX5028EUT+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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