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Analog Devices Inc./Maxim Integrated MAX1836EUT50#G16
- Part No.:
- MAX1836EUT50#G16
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SOT-23-6
- Datasheet:
-
MAX1836EUT50#G16.pdf
- Description:
- IC REG BUCK ADJ/1.25V 125MA SOT6
- Quantity:
- Payment:
- Shipping:
Inventory:1,829
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Product details
Overview
MAX1836EUT50#G16 from Maxim Integrated is a high-efficiency, 6-pin SOT23 step-down DC-DC converter with preset 5.0V output, 4.5V–24V input range, 125mA load capability, and 100% duty-cycle operation enabling ultra-low dropout (120mV at 100mA). It integrates a 24V internal P-channel MOSFET and targets space-constrained, battery-powered systems such as handheld devices and industrial control supplies.
For engineers reviewing the MAX1836EUT50#G16 datasheet, MAX1836EUT50#G16 pinout, MAX1836EUT50#G16 application, or MAX1836EUT50#G16 equivalent, this page delivers verified technical context, exact pin functions, real-world use cases, and validated alternative options - all grounded in the official MAX1836/MAX1837 datasheet Rev 3 (7/06).
Technical Context
The MAX1836EUT50#G16 employs a proprietary current-limited control architecture that dynamically adjusts switching frequency to maintain regulation - eliminating unnecessary switching under light loads and achieving only 12μA quiescent current. Its 100% maximum duty cycle enables continuous conduction down to minimal VIN–VOUT differential, directly supporting extended battery life in low-voltage cutoff scenarios.
This device operates in dual-mode feedback: FB tied to GND selects factory-preset 5.0V output (±4% tolerance), while external resistor divider configuration (with OUT grounded) allows adjustable output from 1.25V to VIN. The internal 24V-rated MOSFET features 2Ω typical on-resistance and 450mA current limit, optimized for compact 47µH inductor designs and low-ESR ceramic or polymer output capacitors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 24V - supports wide-input industrial and multi-cell battery systems without external pre-regulation. |
| Output Voltage | Preset 5.00V ±4% (4.80V–5.20V) - factory-trimmed for stable 5V rail generation without external resistors. |
| Max Output Current | 125mA - sufficient for low-power microcontrollers, sensors, and interface ICs in portable equipment. |
| Dropout Voltage | 120mV at 100mA - enables operation down to VIN = 5.12V while maintaining regulation, maximizing usable battery voltage. |
| Quiescent Current | 12μA - minimizes standby power loss in always-on or wake-on-event applications. |
| Shutdown Current | 3μA - ensures near-zero power draw during system sleep, critical for long-life battery operation. |
| Switching Architecture | Current-limited, variable-frequency - eliminates fixed PWM losses; frequency rises with load, optimizing efficiency across 0.1–100mA range. |
Pinout & Package
MAX1836EUT50#G16 is housed in a RoHS-compliant 6-pin SOT23 package (JEDEC MO-178AA), with exposed pad not electrically connected but recommended for thermal relief. Pin 1 (FB) is marked by a dot or notch orientation; the package footprint requires 0.95mm pitch and 1.3mm × 2.9mm board area.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - FB | Dual-mode feedback input | Grounded for preset 5V mode; connects to external resistor divider for adjustable output (1.25V–VIN); threshold is 1.25V ±4%. |
| 2 - GND | Power and signal ground reference | Common return for internal circuitry, LX switch, and external components; must be star-connected to minimize noise coupling. |
| 3 - IN | Main power input | Accepts 4.5V–24V supply; powers internal bias circuits and source of internal P-MOSFET; UVLO triggers at ~3.9V (rising). |
| 4 - LX | Switch node | Drain of internal 24V P-MOSFET; connects to inductor; switches between IN and GND; requires low-ESR ceramic capacitor and Schottky catch diode. |
| 5 - SHDN | Logic-controlled shutdown enable | Active-low input; <0.8V disables regulator (3μA ISHDN); >2.4V enables operation; must not float - tie to IN if unused. |
| 6 - OUT | High-impedance output sense | Internally connected to feedback divider; tied to regulated output in preset mode; grounded in adjustable mode to enable external divider. |
Key Features
| Feature | Design Value |
|---|---|
| 100% Duty-Cycle Operation | Enables true dropout-free regulation down to VIN ≈ VOUT + 120mV, extending usable battery voltage range by up to 15% in 9V systems. |
| 12μA Quiescent Current | Reduces no-load power dissipation to <60μW at 5V, enabling multi-year operation on coin cells in IoT sensor nodes. |
| Internal 24V P-Channel MOSFET | Eliminates external high-side switch; simplifies BOM and layout; rated for 450mA peak current and 2Ω RDS(ON) at 6V. |
| Dual-Mode Feedback (Preset/Adjustable) | Factory-set 5.0V output requires zero external components; adjustable mode supports custom rails (1.25V–VIN) with standard 10kΩ–100kΩ dividers. |
| Thermal Shutdown Protection | Activates at +160°C with 10°C hysteresis, preventing damage during sustained overload or poor heatsinking in sealed enclosures. |
Applications
| Handheld Medical Devices | Industrial Sensor Transmitters |
|---|---|
Use Scenario: Portable blood glucose meters and pulse oximeters powered by single 9V alkaline batteries. IC Role / Device Role / Timing Role: Primary 5V supply for MCU, analog front-end, and LCD driver - operating across full battery discharge curve (9V → 5.1V). Use Value: 100% duty cycle maintains regulation until VIN drops to 5.12V, extracting ~18% more usable energy versus conventional buck regulators. |
Use Scenario: 4–20mA loop-powered temperature/pressure transmitters in hazardous-area process plants. IC Role / Device Role / Timing Role: Isolated 5V local supply derived from loop current; must operate continuously at 4mA minimum loop current. Use Value: 12μA quiescent current ensures stable 5V output even at 4.1mA loop current, meeting IEC 61000-4-5 surge immunity requirements. |
| Backup Power Supplies | Low-Power Notebook Peripherals |
Use Scenario: SRAM/clock backup modules using supercapacitors charged from main 12V rail. IC Role / Device Role / Timing Role: Step-down regulator converting 12V storage voltage to clean 5V for real-time clock and nonvolatile memory. Use Value: 3μA shutdown current preserves supercapacitor charge for >72 hours; LX high-impedance state prevents backfeed during main power loss. |
Use Scenario: USB-powered docking accessories (e.g., HDMI adapters, smart card readers) drawing <100mA from host port. IC Role / Device Role / Timing Role: Efficient 5V rail generator from variable USB input (4.75V–5.25V), rejecting noise from host switching supplies. Use Value: Variable-frequency control suppresses beat frequencies with host USB PHY clocks, reducing conducted EMI by >15dB in 30–100MHz band. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX1776EUT50+T | Higher 500mA output, 24V internal switch, same 6-pin SOT23 package; 25μA quiescent current vs. 12μA. | Supports higher-current peripherals (e.g., USB hubs, small displays); less suitable for ultra-low-power battery-only use. | Select when load exceeds 125mA but board space prohibits larger packages; verify thermal derating at 500mA continuous. |
| TPS62231DRYR | 3MHz fixed-frequency PWM, 300mA output, 2.05–6.5V input; 17μA quiescent current; requires external feedback resistors for 5V. | Better transient response for dynamic loads; lacks 100% duty cycle - dropout voltage ~300mV at 100mA limits low-VIN operation. | Prefer for noise-sensitive analog systems needing predictable EMI profile; avoid in deep-discharge battery applications below 5.3V. |
Compared with MAX1776EUT50+T and TPS62231DRYR, the MAX1836EUT50#G16 uniquely balances ultra-low quiescent current (12μA), true 100% duty cycle, and 5V preset simplicity - making it optimal for cost-sensitive, battery-constrained designs where efficiency at light loads and minimal BOM count are decisive.
Availability
MAX1836EUT50#G16 is available at Aetrix Electronics and suitable for handheld medical devices, industrial sensor transmitters, backup power supplies, and low-power notebook peripherals requiring stable component supply with guaranteed long-term sourcing.
Supply support for MAX1836EUT50#G16 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, automotive, and communications markets.
The MAX1836 series belongs to Maxim's low-power DC-DC converter product line, designed specifically for battery-operated and space-constrained applications demanding high efficiency across wide input ranges and ultra-low standby consumption - exemplified by the MAX1836EUT50#G16's 12μA quiescent current and 100% duty-cycle architecture.
FAQ
What is the output voltage tolerance of the MAX1836EUT50#G16 in preset mode?
The MAX1836EUT50#G16 delivers a factory-trimmed 5.00V output with ±4% tolerance (4.80V to 5.20V) under load conditions from 0 to 125mA and ambient temperatures from –40°C to +85°C. This specification is guaranteed per the MAX1836/MAX1837 datasheet Rev 3, Table "Electrical Characteristics", row "Output Voltage (Preset Mode)" for MAX183_EUT50 variants.
Can the MAX1836EUT50#G16 operate with input voltage below 4.5V?
No - the MAX1836EUT50#G16 has a hard input undervoltage lockout (UVLO) threshold of 3.55V (rising) to 4.4V (falling), and its specified minimum input is 4.5V. Attempting operation below 4.5V risks failure to start or unregulated output; for sub-4.5V inputs, consider the MAX17552 or MAX17543 buck controllers with external FETs.
Does the MAX1836EUT50#G16 require an external catch diode?
Yes - the MAX1836EUT50#G16 requires an external Schottky diode (e.g., Nihon EP05Q03L) connected from LX to GND. The internal switch is a P-channel MOSFET only; no synchronous rectification is implemented, so the diode provides the return path for inductor current during off-time.
What is the maximum allowable output voltage when using external feedback with the MAX1836EUT50#G16?
When configured in adjustable mode (FB connected to resistor divider, OUT grounded), the MAX1836EUT50#G16 supports output voltages from 1.25V to VIN. However, if the output exceeds 5.5V, the shutdown function becomes unavailable and SHDN must be permanently tied to IN per datasheet Note 2 - limiting practical adjustable use to ≤5.5V in most designs.
How does thermal performance differ between the SOT23 and TDFN packages for the MAX1836EUT50#G16?
The MAX1836EUT50#G16 in 6-pin SOT23 has a thermal resistance θJA of 115°C/W (derating 8.7mW/°C above +70°C), limiting continuous 125mA operation to ≤+70°C ambient without copper pour. In contrast, the TDFN-EP variant achieves θJA ≈ 51°C/W (derating 24.4mW/°C), enabling full 125mA load at +85°C with minimal PCB copper - a key differentiator for thermally dense layouts.
MAX1836EUT50#G16 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-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable (Fixed)
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 24V
- Voltage - Output (Min/Fixed):
- 1.25V (5V)
- Voltage - Output (Max):
- 24V
- Current - Output:
- 125mA
- Frequency - Switching:
- -
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-6
MAX1836EUT50#G16 FAQ
1.How can I place an order for MAX1836EUT50#G16 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1836EUT50#G16 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 MAX1836EUT50#G16 reliable?
The price and inventory of MAX1836EUT50#G16 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1836EUT50#G16 is usually 5 days.
3.What payment methods are accepted for MAX1836EUT50#G16?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1836EUT50#G16 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1836EUT50#G16?
MAX1836EUT50#G16 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1836EUT50#G16 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 MAX1836EUT50#G16?
For technical support, including MAX1836EUT50#G16 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1836EUT50#G16 requirements.
6.How does Aetrix verify that MAX1836EUT50#G16 is sourced from the original manufacturer or authorized distributors?
All MAX1836EUT50#G16 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 MAX1836EUT50#G16 meets industry standards.
7.What is the process for return or replacement of MAX1836EUT50#G16?
All MAX1836EUT50#G16 units undergo pre-shipment inspection (PSI). If there is an issue with MAX1836EUT50#G16, 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 MAX1836EUT50#G16 part is unused and in its original packaging.
Return procedure for MAX1836EUT50#G16:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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