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Analog Devices Inc./Maxim Integrated MAX5028EUT+T
- Part No.:
- MAX5028EUT+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SOT-23-6
- Datasheet:
-
MAX5028EUT+T.pdf
- Description:
- IC REG BOOST 30V 260MA SOT6
- Quantity:
- Payment:
- Shipping:
Inventory:2,133
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Product details
Overview
MAX5028EUT+T from Maxim Integrated is a fixed-output, constant-frequency current-mode PWM boost DC-DC converter optimized for low-noise 30V bias generation in TV tuner and set-top box applications. It operates from 3V to 11V input, delivers up to 4mA output current at 30V, integrates a 40V lateral DMOS switch, and switches at 500kHz with 1μA shutdown current in a 6-pin SOT23 package.
For engineers reviewing the MAX5028EUT+T datasheet, MAX5028EUT+T pinout, MAX5028EUT+T application, or MAX5028EUT+T equivalent, key selection criteria include fixed 30V output accuracy (±3% FB set point), 3V minimum startup voltage, thermal shutdown at 140°C, discontinuous conduction mode for reduced EMI, and compatibility with Schottky diode + ceramic LC filtering for sub-mV ripple.
Technical Context
The MAX5028EUT+T implements a BiCMOS current-mode PWM architecture with direct-summing comparator control-eliminating traditional error amplifier phase shift for cycle-by-cycle regulation. Its internal 40V DMOS switch features 1.3Ω typical on-resistance and 260mA current limit (input-voltage dependent), enabling efficient boost conversion up to 36V output.
It operates exclusively in discontinuous conduction mode (DCM) to suppress output voltage spikes during LX switching transitions, and incorporates a 40ns LX turn-off slew rate control to reduce dV/dt-induced noise. The FB pin is internally connected to a precision 30V divider (29.0V–31.0V tolerance), eliminating external resistors while maintaining ±3% output voltage accuracy over temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 30V ±3% (29.0V–31.0V); enables direct varactor biasing without feedback resistor network. |
| Input Voltage Range | 3.0V to 11.0V; supports single-cell Li-ion, 3.3V/5V rails, and wide-input industrial supplies. |
| Switching Frequency | 500kHz typical (410–670kHz range); allows compact 47µH inductor and ceramic output capacitor sizing. |
| Internal Switch | 40V lateral DMOS with 1.3Ω typical RON; supports up to 36V output with integrated 260mA current limit. |
| Shutdown Current | 1µA maximum; ensures ultra-low power loss during system sleep or standby modes. |
| Thermal Shutdown | 140°C with 2°C hysteresis; protects against sustained overload or poor PCB thermal design. |
| Package | SOT23-6; 2.9mm × 1.6mm footprint with PGND/GND separation for low-noise star grounding. |
Pinout & Package
MAX5028EUT+T is housed in a thermally enhanced 6-pin SOT23 package with separate power ground (PGND) and signal ground (GND) pins to minimize noise coupling in high-gain analog 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 via short trace. |
| 2 - GND | Signal Ground | Analog reference for FB and SHDN; requires star-ground connection with PGND at single point to avoid ground loops. |
| 3 - FB | Feedback Input | Internally tied to 30V divider; no external resistors needed-simplifies layout and improves long-term stability. |
| 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 local 4.7µF ceramic bypass capacitor placed adjacent to pin. |
| 6 - LX | Switch Node | Drain of internal 40V DMOS; connects to inductor and Schottky diode anode; minimize trace area to reduce EMI. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 30V Output | Eliminates external feedback resistors-reduces BOM count, layout area, and drift-related output error. |
| Discontinuous Conduction Mode | Prevents reverse-recovery voltage spikes across output diode, enabling lower-noise output than continuous-mode alternatives. |
| 40ns LX Turn-Off Slew Rate | Reduces high-frequency EMI content at LX node, easing compliance with FCC Class B conducted emissions limits. |
| Separate PGND/GND Pins | Enables clean star-ground topology-critical for <1mVpp output ripple in varactor tuning applications. |
| 1µA Shutdown Current | Supports battery-backed systems requiring multi-year shelf life or ultra-low-power wake-on-event architectures. |
Applications
| TV Tuner Power Supply | Set-Top Box Tuner Power Supply |
|---|---|
|
Use Scenario: Generating stable 30V bias for varactor diodes in analog/digital terrestrial TV tuners operating from 3.3V or 5V main rails. IC Role / Device Role / Timing Role: Primary high-voltage DC-DC converter providing regulated 30V output with minimal switching noise to prevent tuner channel crosstalk. Use Value: Fixed 30V output eliminates resistor tolerance drift; DCM operation and 40ns LX slew rate ensure <1mVpp ripple even without RC filtering. |
Use Scenario: Local 30V supply for QAM/OFDM tuner modules in cable set-top boxes where EMI must not interfere with downstream demodulation. IC Role / Device Role / Timing Role: Low-noise boost regulator powering RF front-end varactors; operates at 500kHz to avoid sensitive IF bands (e.g., 44MHz). Use Value: 1.3Ω RON switch and 260mA current limit support ≥4mA load at 30V with >75% efficiency at 5V input-minimizing thermal load on dense STB PCBs. |
| PCI Cable Modem Power Supply | Avalanche Photodiode Biasing |
|
Use Scenario: Compact 30V bias source for upstream/downstream tuner sections in PCI-express cable modems with strict board space constraints. IC Role / Device Role / Timing Role: Space-optimized DC-DC converter delivering 30V from 3.3V PCIe auxiliary power, packaged in 6-pin SOT23. Use Value: SOT23-6 footprint (2.9mm × 1.6mm) saves >60% area vs. SO-8 alternatives; PGND/GND separation maintains SNR in high-density modem layouts. |
Use Scenario: Precision high-voltage bias for avalanche photodiodes (APDs) in optical receivers requiring stable 28–32V with low temporal noise. IC Role / Device Role / Timing Role: Low-noise, fixed-output boost converter supplying APD cathode voltage-critical for minimizing dark current fluctuations. Use Value: ±3% output tolerance (29.0–31.0V) and <2°C thermal hysteresis ensure APD gain stability across -40°C to +85°C ambient. |
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 (1.8–28V), 5V min input, 28V max output, 28V internal switch | Requires external feedback resistors; unsuitable for direct 30V replacement without redesign | Select only if adjustable output and higher input voltage (>4.5V) are acceptable trade-offs for broader vendor availability. |
| LT1930ES5#TRMPBF | Fixed 30V option available, but requires external feedback for 30V; 40V switch, 1.2MHz switching | Higher frequency increases EMI risk in sensitive RF tuner environments; needs RC filter for equivalent noise performance | Consider only when 1.2MHz operation aligns with system clock domain; verify layout changes for EMI mitigation. |
Compared with TPS61040DBVR and LT1930ES5#TRMPBF, MAX5028EUT+T provides true pin-compatible 30V fixed output with no external resistors, lower EMI due to 500kHz DCM operation, and guaranteed 3V startup-making it uniquely suited for space-constrained, low-noise tuner biasing without design iteration.
Availability
MAX5028EUT+T is available at Aetrix Electronics and suitable for TV tuner power supply, set-top box tuner power supply, and PCI cable modem applications requiring stable component supply, consistent parametric performance, and long-term lifecycle support.
Supply support for MAX5028EUT+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) designs precision analog, mixed-signal, and power management ICs for demanding industrial, communications, and consumer applications.
The MAX5025–MAX5028 family was developed specifically for low-noise, fixed- and adjustable-output boost conversion in RF tuner biasing-prioritizing EMI control, small footprint, and thermal robustness in high-density layouts.
FAQ
What is the output voltage tolerance of the MAX5028EUT+T?
The MAX5028EUT+T has a fixed 30V output with ±3% tolerance, corresponding to a guaranteed range of 29.0V to 31.0V across -40°C to +85°C. This specification is derived from the internal FB set point of 29.0V–31.0V (typical 30V) and is validated per the Electrical Characteristics table in the MAX5025–MAX5028 datasheet Rev 2.
Can the MAX5028EUT+T operate from a 3.0V input supply?
Yes, the MAX5028EUT+T supports a minimum input voltage of 3.0V, confirmed by the "Input Voltage Range" specification (3.0V to 11V) in the Absolute Maximum Ratings and Electrical Characteristics tables. Startup is functional down to 3.0V, and efficiency curves show stable operation at 3V input in Typical Operating Characteristics Figure toc05.
Does the MAX5028EUT+T require external feedback resistors?
No, the MAX5028EUT+T does not require external feedback resistors. As a fixed-output variant, its FB pin is internally connected to a precision resistive divider calibrated for 30V output-unlike the adjustable MAX5026, which requires R1/R2. This is explicitly stated in the Pin Description table and Applications Information section.
What is the maximum continuous output current capability of the MAX5028EUT+T?
The MAX5028EUT+T supports up to 4mA continuous output current at 30V, as demonstrated in the Load Regulation plot (toc24) and Efficiency vs. Load Current graphs (toc04). This assumes 5V input, proper LC filtering, and thermal derating within the 695.7mW power dissipation limit at +70°C ambient.
How does the MAX5028EUT+T achieve low output noise?
The MAX5028EUT+T achieves low output noise through three integrated mechanisms: (1) discontinuous conduction mode (DCM) operation to eliminate diode reverse-recovery spikes, (2) controlled 40ns LX turn-off slew rate to reduce high-frequency EMI, and (3) separate PGND/GND pins enabling star-ground layout that isolates power and signal return paths-verified in the Typical Operating Characteristics waveforms (toc12–toc17).
MAX5028EUT+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Step-Up
- Output Configuration:
- Positive
- Topology:
- Boost
- 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+T FAQ
1.How can I place an order for MAX5028EUT+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX5028EUT+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 MAX5028EUT+T reliable?
The price and inventory of MAX5028EUT+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX5028EUT+T is usually 5 days.
3.What payment methods are accepted for MAX5028EUT+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX5028EUT+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX5028EUT+T?
MAX5028EUT+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX5028EUT+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 MAX5028EUT+T?
For technical support, including MAX5028EUT+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX5028EUT+T requirements.
6.How does Aetrix verify that MAX5028EUT+T is sourced from the original manufacturer or authorized distributors?
All MAX5028EUT+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 MAX5028EUT+T meets industry standards.
7.What is the process for return or replacement of MAX5028EUT+T?
All MAX5028EUT+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX5028EUT+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 MAX5028EUT+T part is unused and in its original packaging.
Return procedure for MAX5028EUT+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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