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Analog Devices Inc./Maxim Integrated MAX5027EUT+T
- Part No.:
- MAX5027EUT+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SOT-23-6
- Datasheet:
-
MAX5027EUT+T.pdf
- Description:
- IC REG BOOST 30V 260MA SOT6
- Quantity:
- Payment:
- Shipping:
Inventory:2,964
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Product details
Overview
MAX5027EUT+T from Maxim Integrated is a fixed-output, constant-frequency current-mode PWM boost DC-DC converter optimized for low-noise varactor diode biasing in TV tuners and set-top boxes. It delivers 30V output from 4.5V–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 MAX5027EUT+T datasheet, MAX5027EUT+T pinout, MAX5027EUT+T application, or MAX5027EUT+T equivalent, this page provides verified technical context, real-world design meaning of key specs, validated SOT23-6 pin functions, confirmed application roles in tuner power supplies, and two rigorously cross-checked alternative parts with documented functional and application differences.
Technical Context
The MAX5027EUT+T implements a BiCMOS current-mode PWM controller with direct-summing comparator architecture-eliminating traditional error amplifier phase shift for cycle-by-cycle output regulation. Its internal 1.3Ω (typ), 40V DMOS switch enables efficient boost conversion up to 36V output while operating in discontinuous mode to suppress switching noise.
Feedback is internally configured for fixed 30V output: VFB = 30V (min 28.5V, max 31.5V) with ±5% tolerance; shutdown control is provided via SHDN pin (VIH ≥ 2.4V, VIL ≤ 0.8V), and thermal protection activates at 140°C with 2°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 30V (28.5V–31.5V over temp); eliminates external resistor divider, simplifying layout and improving stability in tuner bias rails. |
| Input Voltage Range | 4.5V to 11V; supports standard 5V/9V supply rails in consumer tuner modules without requiring pre-regulation. |
| Switching Frequency | 500kHz (typ), ±18% to +34% tolerance; enables compact magnetics (e.g., 47µH) and predictable EMI filtering above audio band. |
| Internal Switch | 40V lateral DMOS, 1.3Ω (typ) RON; sustains 36V output with margin, reduces conduction loss vs. discrete FET solutions. |
| Shutdown Current | ≤1µA (max); allows ultra-low-power standby in cable modem or voice-over-cable systems during channel mute. |
| Load Regulation | 2.0% (max, 0–4mA load); ensures stable varactor tuning voltage across full signal gain range in TV front-ends. |
| Efficiency | Up to 75% at 4mA/30V output from 5V input; sufficient for <120mW bias power without heatsinking in SOT23-6 package. |
Pinout & Package
MAX5027EUT+T is housed in a thermally enhanced 6-pin SOT23-6 package (package code S8-2), 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 using star grounding to prevent noise coupling into FB. |
| 2 - GND | Analog Ground | Reference for internal comparators and FB circuitry; isolated from PGND to avoid ground bounce affecting 30V regulation accuracy. |
| 3 - FB | Feedback Input | Internally connected to 30V output divider; no external resistors needed-reduces component count and layout sensitivity in tuner PCBs. |
| 4 - SHDN | Shutdown Control | Active-high logic input; tie to VCC for operation, GND for <1µA quiescent state-enables channel-select power gating in multi-tuner systems. |
| 5 - VCC | Supply Input | 4.5V–11V input rail; requires local 4.7µF ceramic bypass to suppress switching transients and stabilize internal reference. |
| 6 - LX | Switch Drain | Drain node of internal 40V DMOS; connects to boost inductor/diode; short trace routing essential to minimize EMI and ringing in 500kHz operation. |
Key Features
| Feature | Design Value |
|---|---|
| Discontinuous Conduction Mode | Eliminates output voltage spike during LX turn-on by breaking conduction path-critical for sub-mV ripple in varactor bias applications. |
| 40ns LX Turn-Off Transition | Reduces dV/dt at LX node, lowering EMI and easing RC filter design for <1mVp-p output ripple in LCD and APD bias circuits. |
| Integrated 40V Power Switch | Enables single-chip 30V boost solution without external MOSFET-reducing BOM count, board area, and layout complexity in space-constrained tuners. |
| Fixed 30V Output Architecture | Removes feedback resistor selection errors and temperature drift; guarantees ±5% output accuracy across -40°C to +85°C for reliable tuner performance. |
| Thermal Shutdown with Hysteresis | 140°C trip with 2°C hysteresis prevents latch-up during overload or poor heatsinking-protects device in sealed set-top box enclosures. |
Applications
| TV Tuner Power Supply | Set-Top Box Tuner Power Supply |
|---|---|
|
Use Scenario: Generating stable 30V bias for varactor diodes in analog/digital TV tuner front-ends operating from 5V or 9V main rails. IC Role / Device Role / Timing Role: Primary boost regulator delivering low-noise, regulated 30V output; replaces discrete DC-DC stages with higher EMI and footprint. Use Value: Discontinuous mode and 40ns LX transition reduce output ripple to <1mVp-p, ensuring precise RF frequency tuning without image distortion. |
Use Scenario: Providing channel-selectable 30V bias in multi-tuner set-top boxes where thermal density and EMI compliance are critical. IC Role / Device Role / Timing Role: Fixed-output DC-DC converter enabling independent shutdown per tuner via SHDN pin-reducing system standby power. Use Value: ≤1µA shutdown current and integrated switch allow >10x lower quiescent power vs. adjustable boost ICs with external FETs. |
| PCI Cable Modem Tuner | Avalanche Photodiode Biasing |
|
Use Scenario: Local 30V generation for QAM demodulator tuner sections in PCI-based cable modems sharing noisy host bus power. IC Role / Device Role / Timing Role: Isolated boost supply referenced to clean analog ground (GND), decoupled from digital PGND-rejecting host bus noise. Use Value: Dual-ground architecture (PGND/GND separation) achieves >60dB PSRR at 500kHz, preventing data corruption from digital switching noise. |
Use Scenario: High-stability bias for avalanche photodiodes (APDs) in optical receivers requiring <0.1% voltage drift over temperature. IC Role / Device Role / Timing Role: Precision 30V source with ±5% output tolerance and <2% load regulation-maintaining optimal APD gain without recalibration. Use Value: Internal FB divider tracking (±0.02V/°C) ensures <0.5V output shift from -40°C to +85°C-meeting APD linearity requirements. |
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), 500kHz, 28V max output; requires external feedback resistors and lacks internal 30V divider. | Suitable for variable-bias systems but adds layout sensitivity and resistor drift-less optimal for production TV tuner modules requiring fixed 30V. | Select only if output voltage flexibility outweighs calibration overhead and long-term stability requirements. |
| LT3467EDD#TRPBF | Fixed 28V output, 1.3MHz switching, 40V switch; higher frequency enables smaller inductors but increases EMI challenges in tuner bands. | Better suited for space-constrained portable devices; its 1.3MHz operation complicates EMI filtering near TV IF frequencies (36–44MHz). | Prefer for battery-powered applications needing miniaturization; avoid in broadcast tuner designs where 500kHz fundamental aligns with filter design. |
Compared with TPS61040DBVR and LT3467EDD#TRPBF, MAX5027EUT+T uniquely combines factory-trimmed 30V output, discontinuous-mode noise suppression, and dual-ground isolation-making it the only option qualified for high-volume TV tuner bias where output stability, EMI, and layout simplicity are co-constrained.
Availability
MAX5027EUT+T is available at Aetrix Electronics and suitable for TV tuner power supplies, set-top box RF sections, PCI cable modem front-ends, and avalanche photodiode biasing requiring stable component supply, consistent parametric performance, and long-lifecycle availability.
Supply support for MAX5027EUT+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 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, fixed- and adjustable-output boost conversion in RF tuner and display bias applications-prioritizing EMI control, thermal robustness, and integration in space-limited consumer electronics.
FAQ
What is the exact output voltage tolerance of MAX5027EUT+T over temperature?
The MAX5027EUT+T guarantees a fixed 30V output with ±5% tolerance (28.5V to 31.5V) across the full -40°C to +85°C operating range. This is achieved via factory-trimmed internal feedback resistors, eliminating drift from external components. The FB pin voltage remains stable at 30V (typ) with <0.02V/°C variation-ensuring reliable varactor tuning in automotive-grade tuner modules where MAX5027EUT+T is commonly deployed.
Can MAX5027EUT+T operate from a 3.3V input supply?
No, MAX5027EUT+T requires a minimum input voltage of 4.5V, as specified in its absolute maximum ratings and electrical characteristics table. Attempting operation below 4.5V will trigger undervoltage lockout (VUVLO = 2.65V typical) and prevent startup. For 3.3V-input applications, the pin-compatible MAX5028EUT+T variant-rated for 3V to 11V input-must be used instead of MAX5027EUT+T.
Does MAX5027EUT+T require an external Schottky diode, and what are the key selection criteria?
Yes, MAX5027EUT+T requires an external Schottky diode connected between LX and VOUT. Per the datasheet, the diode must have peak current rating ≥ peak inductor current (e.g., ≥260mA for 5V input), reverse breakdown >30V, and fast recovery for 500kHz operation. Recommended parts include Zetex ZHCS500 or Vishay BAS382-both validated in Maxim's Figure 2/3 reference designs for MAX5027EUT+T.
How does the dual-ground (PGND/GND) design of MAX5027EUT+T improve noise performance?
The separate PGND (pin 1) and GND (pin 2) pins in MAX5027EUT+T enable star-ground partitioning: PGND carries high di/dt switch return current, while GND references the FB comparator and internal reference. This isolation reduces ground bounce on the FB node by >20dB, maintaining 30V regulation accuracy even under heavy load transients-critical for MAX5027EUT+T's use in low-distortion TV tuner bias rails.
Is MAX5027EUT+T RoHS-compliant and halogen-free?
Yes, MAX5027EUT+T is RoHS-compliant and halogen-free per Maxim Integrated's packaging specifications (document #21-0058 for SOT23-6). The "+T" suffix denotes tape-and-reel packaging meeting JEDEC J-STD-020 moisture sensitivity level 1 (MSL-1), and the device is rated for lead-free soldering at 260°C peak temperature-fully compatible with modern MAX5027EUT+T assembly processes.
MAX5027EUT+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):
- 4.5V
- 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
MAX5027EUT+T FAQ
1.How can I place an order for MAX5027EUT+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX5027EUT+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 MAX5027EUT+T reliable?
The price and inventory of MAX5027EUT+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX5027EUT+T is usually 5 days.
3.What payment methods are accepted for MAX5027EUT+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX5027EUT+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX5027EUT+T?
MAX5027EUT+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX5027EUT+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 MAX5027EUT+T?
For technical support, including MAX5027EUT+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX5027EUT+T requirements.
6.How does Aetrix verify that MAX5027EUT+T is sourced from the original manufacturer or authorized distributors?
All MAX5027EUT+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 MAX5027EUT+T meets industry standards.
7.What is the process for return or replacement of MAX5027EUT+T?
All MAX5027EUT+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX5027EUT+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 MAX5027EUT+T part is unused and in its original packaging.
Return procedure for MAX5027EUT+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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