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Analog Devices Inc./Maxim Integrated MAX1837EUT50#TG16
- Part No.:
- MAX1837EUT50#TG16
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SOT-23-6
- Datasheet:
-
MAX1837EUT50#TG16.pdf
- Description:
- IC REG BUCK 5V 250MA SOT6
- Quantity:
- Payment:
- Shipping:
Inventory:4,434
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Product details
Overview
The MAX1837EUT50#TG16 from Maxim Integrated is a high-efficiency, 6-pin SOT23 step-down DC-DC converter with a factory-preset 5.0V output, 4.5V–24V input range, 250mA load capability, and 100% duty-cycle operation enabling ultra-low dropout (120mV at 100mA). It integrates a 24V internal P-channel MOSFET and delivers >90% efficiency in space-constrained battery-powered systems such as handheld devices and industrial control supplies.
For engineers reviewing the MAX1837EUT50#TG16 datasheet, MAX1837EUT50#TG16 pinout, MAX1837EUT50#TG16 application, or MAX1837EUT50#TG16 equivalent, key selection considerations include its 12μA quiescent current, adjustable output mode (1.25V to VIN), thermal shutdown at 160°C, and compatibility with standard 47µH inductors and low-ESR output capacitors.
Technical Context
The MAX1837EUT50#TG16 employs a proprietary current-limited control architecture that dynamically adjusts switching frequency based on load-eliminating unnecessary switching under light loads while maintaining regulation. Its 100% duty-cycle capability enables operation down to VIN = VOUT + 120mV, critical for extending usable battery voltage range in 9V and multi-cell systems.
This device operates in dual-mode feedback: FB grounded for fixed 5.0V output (±4% tolerance), or configured with external resistive divider for adjustable output (1.25V–VIN) with 1.25V reference (±4%). The LX pin drives the external inductor with a typical 2Ω on-resistance and 500–900mA current limit, supporting discontinuous conduction mode across its full load range.
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 pre-regulation |
| Output Voltage | 5.00V ±4% (preset mode) - factory-trimmed for stable 5V rail generation without external feedback components |
| Max Output Current | 250mA - sufficient for microcontrollers, sensors, and low-power logic in portable equipment |
| Quiescent Current | 12μA - minimizes standby power loss, extending battery life in always-on monitoring applications |
| Dropout Voltage | 120mV at 100mA - enables regulation down to VIN = 5.12V, maximizing usable battery capacity |
| Switching On-Resistance | 2Ω (typ at VIN = 6V) - defines conduction loss and thermal dissipation in high-current pulses |
| Shutdown Current | 3μA - ensures near-zero power draw during system sleep or deep standby modes |
Pinout & Package
MAX1837EUT50#TG16 is housed in a RoHS-compliant 6-pin SOT23 package (3.0mm × 1.7mm × 1.3mm) with exposed pad for thermal enhancement. Pin 1 is FB, pin 2 is GND, pin 3 is IN, pin 4 is LX, pin 5 is SHDN, and pin 6 is OUT. The exposed pad (EP) must be soldered to a PCB ground plane for optimal thermal performance and EMI suppression.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB (Pin 1) | Dual-mode feedback input | Grounded for 5.0V preset output; connected to resistor divider for adjustable output (1.25V–VIN) with 1.25V internal reference |
| GND (Pin 2) | Power and signal ground reference | Common return path for input capacitor, output capacitor, and exposed pad; star-ground connection required for stability |
| IN (Pin 3) | Main power input | Accepts 4.5V–24V supply; connects to source of internal P-channel MOSFET; requires local 10µF/25V ceramic or polymer input capacitor |
| LX (Pin 4) | Switch node | Drain of internal 24V P-MOSFET; connects directly to inductor; high di/dt node requiring short, low-inductance layout |
| SHDN (Pin 5) | Logic-controlled enable/disable | Active-low input; <0.8V disables IC (3μA ISHDN); >2.4V enables; must not float; tied to IN if unused |
| OUT (Pin 6) | High-impedance output sense | Internally connected to feedback divider; connect to regulated output in preset mode; tie to GND in adjustable mode |
Key Features
| Feature | Design Value |
|---|---|
| 100% duty-cycle operation | Enables lowest possible dropout voltage (120mV @ 100mA), extending usable input voltage range in battery systems |
| Current-limited control architecture | Eliminates fixed-frequency PWM losses; reduces light-load supply current to 12μA without compromising regulation |
| Integrated 24V P-channel MOSFET | Removes need for external high-voltage switch; simplifies BOM and layout for 24V-input step-down designs |
| Dual-mode feedback (preset/adjustable) | Factory-set 5.0V output eliminates external resistors; optional 1.25V–VIN adjustment via two external resistors |
| Thermal shutdown with 10°C hysteresis | Protects against sustained overload; auto-recovery prevents latch-up during transient overloads |
Applications
| Handheld Medical Devices | Industrial Sensor Nodes |
|---|---|
Use Scenario: Portable blood glucose meters and pulse oximeters powered by single 9V or dual AA batteries. IC Role / Device Role / Timing Role: Primary 5V power rail generator for MCU, display driver, and analog front-end. Use Value: 12μA quiescent current extends battery life beyond 6 months; 100% duty cycle maintains regulation until battery drops to 5.12V. | Use Scenario: Wireless temperature/pressure transmitters mounted in remote factory locations. IC Role / Device Role / Timing Role: Local 5V supply for low-power microcontroller and 4–20mA loop transmitter IC. Use Value: 4.5V–24V input range accommodates wide industrial supply variations; thermal shutdown prevents field failure during ambient overheating. |
| Backup Power Supplies | 4–20mA Loop Power Supplies |
Use Scenario: Secondary 5V rail in PLC I/O modules during main power interruption. IC Role / Device Role / Timing Role: Standby DC-DC converter activated from supercapacitor or backup battery. Use Value: 3μA shutdown current preserves backup energy; fast startup (<100µs) ensures uninterrupted sensor data logging. | Use Scenario: Two-wire field instruments drawing power from 4–20mA loop while delivering 5V to internal circuitry. IC Role / Device Role / Timing Role: High-efficiency buck regulator extracting regulated 5V from loop voltage (typically 12–24V). Use Value: >90% efficiency minimizes heat buildup in sealed enclosures; 250mA output supports active signal conditioning and wireless comms. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX1776ETT50-T | Higher 500mA output, TDFN-6 package, same 5V preset, but uses 24V internal switch with different current-limit threshold (1.2A typ) | Supports higher-current loads (e.g., motor drivers, larger displays); requires different inductor sizing and layout due to higher peak currents | Select MAX1776ETT50-T when >250mA continuous load or smaller footprint (3×3mm TDFN) is required |
| TPS62231DRYT | 3MHz fixed-frequency PWM, 300mA output, 2.05–6.0V input, 5V preset, 17μA IQ, SOT-23-6 package | Better light-load efficiency via DCS-Control™; lacks 100% duty cycle - dropout ~300mV - limiting low-VIN usability | Choose TPS62231DRYT for noise-sensitive applications needing fixed-frequency operation and tighter output ripple |
Compared with MAX1776ETT50-T and TPS62231DRYT, the MAX1837EUT50#TG16 offers superior dropout performance (120mV vs. ≥300mV) and lower quiescent current (12μA vs. 17μA), making it optimal for battery life-critical, wide-input-range applications where variable-frequency operation is acceptable.
Availability
MAX1837EUT50#TG16 is available at Aetrix Electronics and suitable for handheld medical devices, industrial sensor nodes, backup power supplies, and 4–20mA loop power supplies requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX1837EUT50#TG16 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 computing markets.
The MAX1836/MAX1837 product line was designed specifically for low-power, wide-input-voltage DC-DC conversion in battery-operated and distributed power systems, emphasizing ultra-low quiescent current, minimal dropout, and compact SOT23/TDFN packaging.
FAQ
What is the guaranteed output voltage tolerance for MAX1837EUT50#TG16 in preset mode?
The MAX1837EUT50#TG16 guarantees a 5.00V output with ±4% tolerance (4.80V to 5.20V) across full temperature range (-40°C to +85°C) and load (0–250mA), as specified in the Electrical Characteristics table under "Output Voltage (Preset Mode)" with conditions FB = GND.
Can MAX1837EUT50#TG16 operate with input voltage below 4.5V?
No. The MAX1837EUT50#TG16 has a minimum input voltage of 4.5V per Absolute Maximum Ratings and Electrical Characteristics. Input below 4.5V triggers undervoltage lockout (VUVLO rising threshold = 3.55–4.4V), disabling regulation. For sub-4.5V operation, consider alternative regulators like the MAX1724 series.
What is the maximum recommended inductor value for MAX1837EUT50#TG16 in a 5V-output application?
The MAX1837EUT50#TG16 supports inductors up to six times the calculated minimum value. For 5V output with VIN = 12V, LMIN ≈ 10µH; thus, inductors up to 60µH are acceptable. However, the typical application uses 47µH (Sumida CDRH5D28-470), balancing size, cost, and peak-current overshoot.
Does MAX1837EUT50#TG16 require an external Schottky diode, and what are the key selection criteria?
Yes, MAX1837EUT50#TG16 requires an external Schottky diode (e.g., Nihon EP05Q03L). Key criteria: reverse breakdown > VINMAX (24V), RMS current rating ≥ 0.5A, fast turn-on time, and low forward voltage (<0.4V at peak current) to minimize conduction loss and maintain >90% efficiency.
How does the shutdown function behave when the output voltage exceeds 5.5V in adjustable mode?
When configured for output voltages above 5.5V in adjustable mode, the shutdown feature of MAX1837EUT50#TG16 cannot be used - SHDN must be permanently tied to IN. This restriction is explicitly stated in the datasheet Note 2 and Pin Description to prevent internal overstress and ensure safe operation.
MAX1837EUT50#TG16 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:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 24V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- Current - Output:
- 250mA
- Frequency - Switching:
- -
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-6
MAX1837EUT50#TG16 FAQ
1.How can I place an order for MAX1837EUT50#TG16 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1837EUT50#TG16 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 MAX1837EUT50#TG16 reliable?
The price and inventory of MAX1837EUT50#TG16 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1837EUT50#TG16 is usually 5 days.
3.What payment methods are accepted for MAX1837EUT50#TG16?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1837EUT50#TG16 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1837EUT50#TG16?
MAX1837EUT50#TG16 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1837EUT50#TG16 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 MAX1837EUT50#TG16?
For technical support, including MAX1837EUT50#TG16 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1837EUT50#TG16 requirements.
6.How does Aetrix verify that MAX1837EUT50#TG16 is sourced from the original manufacturer or authorized distributors?
All MAX1837EUT50#TG16 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 MAX1837EUT50#TG16 meets industry standards.
7.What is the process for return or replacement of MAX1837EUT50#TG16?
All MAX1837EUT50#TG16 units undergo pre-shipment inspection (PSI). If there is an issue with MAX1837EUT50#TG16, 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 MAX1837EUT50#TG16 part is unused and in its original packaging.
Return procedure for MAX1837EUT50#TG16:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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