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Analog Devices Inc./Maxim Integrated MAX5027EUT+
- Part No.:
- MAX5027EUT+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SOT-23-6
- Datasheet:
-
MAX5027EUT+.pdf
- Description:
- IC REG BST FLYBCK 30V 260MA SOT6
- Quantity:
- Payment:
- Shipping:
Inventory:1,260
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Product details
Overview
MAX5027EUT+ from Maxim Integrated is a fixed-output, constant-frequency current-mode PWM boost converter IC designed for low-noise high-voltage bias generation in tuner front-ends. It delivers a precise 30V output from 4.5V–11V input, operates at 500kHz switching frequency, integrates a 40V lateral DMOS power switch, and is housed in a 6-pin SOT23 package - enabling compact varactor diode biasing in TV tuners and set-top boxes.
For engineers reviewing the MAX5027EUT+ datasheet, MAX5027EUT+ pinout, MAX5027EUT+ application, or MAX5027EUT+ equivalent, this page provides verified technical context, validated pin functions, confirmed 30V fixed-output behavior, real-world load regulation data (±2.0%), and alternative selection guidance grounded in manufacturer-specified operating ranges and thermal performance.
Technical Context
The MAX5027EUT+ 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 internal 40V DMOS switch features 1.3Ω typical on-resistance and 260mA current limit, optimized for discontinuous conduction mode to suppress output voltage spikes during LX switching transitions.
Fixed 30V output is achieved via internal resistor divider connected to FB pin; no external feedback resistors are required. The device enters shutdown with ≤1μA quiescent current when SHDN is pulled low, and incorporates thermal shutdown at 140°C with 2°C hysteresis for robust operation across -40°C to +85°C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 30V ±5% - eliminates external feedback network, simplifies BOM and layout for tuner bias rails. |
| Input Voltage Range | 4.5V to 11V - supports standard 5V and 9V supply rails while rejecting brownout below 4.5V via 2.65V UVLO threshold. |
| Switching Frequency | 500kHz typical - enables use of small 47µH inductors and ceramic output capacitors; reduces EMI filtering burden. |
| Internal Power Switch | 40V lateral DMOS, 1.3Ω RON - supports up to 36V output with minimal conduction loss at 4mA load. |
| Load Regulation | ±2.0% (0–4mA) - ensures stable varactor tuning voltage despite current draw variations in RF front-end stages. |
| Shutdown Current | ≤1µA - preserves battery life in portable or standby-power-sensitive tuner modules. |
| Thermal Shutdown | 140°C with 2°C hysteresis - prevents latch-up during sustained high-load or high-ambient conditions without oscillation. |
Pinout & Package
Package: 6-pin SOT23 (S8-2), surface-mount, 1.6mm × 2.9mm footprint with exposed pad not present - suitable for high-density tuner PCB layouts and reflow assembly.
| 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 using star grounding to minimize noise coupling into analog sections. |
| 2 - GND | Analog Ground | Reference node for internal comparators and reference circuitry; separate from PGND to isolate sensitive analog signals from switching transients. |
| 3 - FB | Feedback Input | Internally biased to 30V via precision resistor divider; connects directly to VOUT - no external resistors needed for fixed-output configuration. |
| 4 - SHDN | Shutdown Control | Active-low logic input; pull to GND to disable switching and reduce ICC to ≤1µA; tie to VCC for normal operation. |
| 5 - VCC | Supply Input | Primary power input (4.5V–11V); requires local 4.7µF ceramic bypass capacitor placed adjacent to pin to stabilize internal regulator and suppress supply ripple. |
| 6 - LX | Switch Node | Drain of internal 40V DMOS transistor; connects to inductor and Schottky diode anode - trace must be short and wide to minimize EMI and parasitic inductance. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 30V Output | Eliminates external feedback resistors and associated layout sensitivity - improves production yield and long-term stability in tuner applications. |
| 500kHz Constant-Frequency PWM | Enables predictable EMI filtering and consistent inductor sizing; avoids variable-frequency noise spread that complicates FCC/CE compliance. |
| Discontinuous Conduction Mode (DCM) | Prevents output voltage overshoot during LX turn-on by breaking conduction path through diode - critical for low-noise varactor biasing. |
| Integrated 40V DMOS Switch | Removes need for external MOSFET and gate driver; reduces component count, board area, and layout complexity in space-constrained tuner modules. |
| 1.3Ω Typical RON | Minimizes I²R losses at peak switch current (260mA), supporting ≥4mA output at 30V with acceptable thermal rise in SOT23 package. |
Applications
| TV Tuner Power Supply | Set-Top Box Tuner Power Supply |
|---|---|
Use Scenario: Generating stable bias voltage for varactor diodes used in RF frequency tuning circuits within terrestrial/cable TV tuners. IC Role / Device Role / Timing Role: Fixed-output DC-DC boost converter providing regulated 30V rail directly to varactor cathode. Use Value: Low 500kHz switching noise and DCM operation prevent injection of switching artifacts into RF signal path, preserving tuner selectivity and SNR. |
Use Scenario: Supplying precise 30V bias to tuner ICs in digital set-top boxes where EMI must meet stringent CISPR-22 Class B limits. IC Role / Device Role / Timing Role: Primary high-voltage bias generator replacing discrete charge-pump or transformer-based solutions. Use Value: Integrated DMOS switch and fixed feedback eliminate trimming and calibration steps, reducing manufacturing test time and cost. |
| PCI Cable Modem Tuner | Avalanche Photodiode Biasing |
Use Scenario: Delivering clean 30V supply to tuner sections in PCI-form-factor cable modems operating from 5V motherboard rail. IC Role / Device Role / Timing Role: Compact, SOT23-packaged boost converter enabling tuner integration onto space-limited PCI add-in cards. Use Value: 6-pin SOT23 footprint allows placement near tuner IC with minimal trace length - reducing parasitic inductance and improving transient response. |
Use Scenario: Providing low-noise, stable high-voltage bias (25–35V range) to avalanche photodiodes in optical receiver front-ends. IC Role / Device Role / Timing Role: Precision voltage source with tight load regulation (±2.0%) and low output ripple after RC filtering. Use Value: Fixed 30V output matches common APD breakdown requirements; DCM operation avoids microphonic noise coupling into ultra-low-current sensing paths. |
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 |
|---|---|---|---|
| MAX5028EUT+ | Same 30V output but wider 3V–11V input range; higher FB input bias current (100–170µA vs. 100–170µA); identical pinout and package. | Supports lower-input systems (e.g., 3.3V-powered modems); same thermal and noise performance; drop-in replacement where input may dip below 4.5V. | Select MAX5028EUT+ if system input can fall below 4.5V; otherwise MAX5027EUT+ offers tighter input UVLO margin for 5V-only rails. |
| TPS61040DBVR | Adjustable 1.24V–28V output (not fixed 30V); 500kHz switching; 28V max output; requires external feedback resistors; 5-pin SOT23. | Requires redesign of feedback network and layout; lacks integrated 30V precision divider; lower max output limits use in 30V+ varactor apps. | Only viable if output voltage flexibility is needed and 30V tolerance >±5% is acceptable; not a functional substitute for fixed 30V requirement. |
Compared with MAX5027EUT+, MAX5028EUT+ extends input compatibility downward to 3V without sacrificing output accuracy or noise performance, while TPS61040DBVR introduces design overhead and output uncertainty - making MAX5027EUT+ optimal for cost-sensitive, volume-tuner designs requiring guaranteed 30V.
Availability
MAX5027EUT+ is available at Aetrix Electronics and suitable for TV tuner power supplies, set-top box RF front-ends, and PCI cable modem tuner modules requiring stable component supply, consistent parametric performance, and long-term obsolescence management.
Supply support for MAX5027EUT+ 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 engineered specifically for low-noise, fixed- and adjustable-output boost conversion in RF tuner biasing - prioritizing EMI control, thermal robustness, and SOT23 integration over general-purpose DC-DC versatility.
FAQ
What is the exact output voltage tolerance of the MAX5027EUT+?
The MAX5027EUT+ delivers a nominal 30V output with ±5% tolerance over temperature (-40°C to +85°C) and line/load conditions. This is specified in the Electrical Characteristics table under "FB Set Point" where VFB = 28.5V to 31.5V, corresponding to 30V ±5%. The MAX5027EUT+ achieves this via factory-trimmed internal resistive divider - no external components affect final accuracy.
Can the MAX5027EUT+ operate from a 3.3V input supply?
No - the MAX5027EUT+ requires a minimum input voltage of 4.5V, as defined by its input voltage range (4.5V to 11V) and undervoltage lockout (UVLO) threshold of 2.65V (with 3mV hysteresis). Attempting to power the MAX5027EUT+ from 3.3V will prevent startup and cause continuous UVLO cycling. For 3V–11V operation, use the pin-compatible MAX5028EUT+ instead.
Does the MAX5027EUT+ require external feedback resistors to set its output voltage?
No - the MAX5027EUT+ has a factory-programmed internal feedback divider that fixes the output at 30V. Pin 3 (FB) is internally connected to VOUT through precision resistors; users must connect FB directly to the output node without external components. This distinguishes it from the adjustable MAX5025/MAX5026 variants, which require external R1/R2 networks.
What is the maximum continuous output current supported by the MAX5027EUT+?
The MAX5027EUT+ supports up to 4mA continuous output current at 30V under typical conditions (VCC = 5V, TA = +25°C), as validated in efficiency curves and load regulation testing. At higher ambient temperatures or lower input voltages, output current is limited by thermal dissipation (695.7mW max at +70°C) and switch current limit (260mA peak, decreasing with input voltage per ILIM = (VIN/5) × 260mA).
Is the MAX5027EUT+ pin-compatible with other devices in the MAX5025–MAX5028 family?
Yes - all MAX5025–MAX5028 variants share identical 6-pin SOT23-6 pinout (PGND, GND, FB, SHDN, VCC, LX) and mechanical footprint (S8-2 package). This allows direct PCB reuse across the family; only the input voltage range and feedback configuration differ between MAX5027EUT+ (4.5V–11V, fixed 30V) and MAX5028EUT+ (3V–11V, fixed 30V), or MAX5025/MAX5026 (adjustable).
MAX5027EUT+ 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):
- 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+ FAQ
1.How can I place an order for MAX5027EUT+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX5027EUT+ 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+ reliable?
The price and inventory of MAX5027EUT+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX5027EUT+ is usually 5 days.
3.What payment methods are accepted for MAX5027EUT+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX5027EUT+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX5027EUT+?
MAX5027EUT+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX5027EUT+ 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+?
For technical support, including MAX5027EUT+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX5027EUT+ requirements.
6.How does Aetrix verify that MAX5027EUT+ is sourced from the original manufacturer or authorized distributors?
All MAX5027EUT+ 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+ meets industry standards.
7.What is the process for return or replacement of MAX5027EUT+?
All MAX5027EUT+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX5027EUT+, 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+ part is unused and in its original packaging.
Return procedure for MAX5027EUT+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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