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Analog Devices Inc./Maxim Integrated MAX1837EUT50-T
- Part No.:
- MAX1837EUT50-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SOT-23-6
- Datasheet:
-
MAX1837EUT50-T.pdf
- Description:
- IC REG BCK ADJ/1.25V 250MA SOT23
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
The MAX1837EUT50-T 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, 250mA load capability, 12μA quiescent current, 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 MAX1837EUT50-T datasheet, MAX1837EUT50-T pinout, MAX1837EUT50-T application, or MAX1837EUT50-T equivalent, key selection criteria include its fixed 5V output mode, SOT23 package compatibility, dropout performance under low VIN conditions, and shutdown current of 3μA - all critical for low-power embedded power rail design.
Technical Context
The MAX1837EUT50-T employs a proprietary current-limited control architecture operating up to 100% duty cycle, eliminating fixed-frequency PWM switching losses and enabling variable-frequency operation that scales with load. Its internal 24V-rated P-channel MOSFET features 2Ω typical on-resistance and 500–900mA current limit, supporting efficient regulation across wide input ranges.
This device uses dual-mode feedback: FB grounded for preset 5.0V output (±4% tolerance), or external resistor divider for adjustable 1.25V–VIN outputs. The OUT pin serves as high-impedance sense input and must connect to VOUT in preset mode; SHDN enables logic-controlled shutdown with 0.8–2.4V threshold and 3μA leakage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 24V - supports wide-input industrial and battery systems including 9V, 12V, and 24V rails without external pre-regulation. |
| Output Voltage (Preset) | 4.80V to 5.20V at 0–250mA load - factory-trimmed 5V output with ±4% accuracy over temperature and line/load variation. |
| Max Output Current | 250mA continuous - sufficient for powering microcontrollers, sensors, and interface ICs in portable equipment. |
| Quiescent Current | 12μA typical - minimizes standby power loss in always-on subsystems and extends battery runtime. |
| Dropout Voltage | 120mV at 100mA load - enables operation down to VIN = 5.12V while maintaining regulation, maximizing usable battery voltage range. |
| Shutdown Current | 3μA maximum - ensures near-zero power draw during system sleep modes. |
| Switching Frequency | Variable (≈1–2 MHz typical) - eliminates EMI peaks and allows use of small 22–47μH inductors and ceramic capacitors. |
Pinout & Package
MAX1837EUT50-T is housed in a 6-pin SOT23 package (JEDEC MO-178AA) with exposed pad (EP) internally connected to GND for thermal and electrical integrity. Pin 1 is marked by a dot or beveled edge; EP must be soldered to a PCB ground plane for optimal thermal dissipation and noise immunity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 FB | Dual-mode feedback input | Grounded for 5V preset mode; connects to resistive divider for adjustable output; 1.25V reference threshold with ±50mV hysteresis. |
| 2 GND | Power and signal ground | Common return path for internal circuitry, LX switch, and EP pad; requires low-impedance connection to PCB ground plane. |
| 3 IN | Main power input | Accepts 4.5–24V supply; powers internal bias circuits and source of internal P-MOSFET; UVLO triggers at 3.45–4.3V falling. |
| 4 LX | Switch node | Drain of internal P-MOSFET; connects to inductor; switches between IN and GND; rated for -2V to VIN+0.3V. |
| 5 SHDN | Logic-enable input | Active-low shutdown control; <0.8V disables regulator (3μA ISHDN); >2.4V enables operation; slew rate ≥10V/ms required. |
| 6 OUT | Output sense input | High-impedance feedback tap; connects directly to VOUT in preset mode; tied to GND when using external divider. |
Key Features
| Feature | Design Value |
|---|---|
| 100% duty-cycle operation | Enables true dropout-free regulation down to VIN ≈ VOUT + 120mV, extending usable battery life in 5V systems. |
| 250mA integrated switch | Eliminates need for external MOSFET and gate driver, reducing BOM count and PCB area in compact designs. |
| 12μA quiescent current | Supports micropower applications such as sensor nodes and real-time clocks where standby current dominates lifetime energy budget. |
| Internal 24V P-channel MOSFET | Allows direct interfacing with 24V industrial buses without external level-shifting or pre-regulators. |
| Dual-mode feedback (preset/adjustable) | Reduces design flexibility overhead: preset mode requires zero external components; adjustable mode supports 1.25V–VIN with standard resistor values. |
Applications
| Handheld Devices | Industrial Control Supplies |
|---|---|
Use Scenario: Powering ARM Cortex-M microcontrollers, OLED displays, and BLE radios in portable test meters and field instruments. IC Role / Device Role / Timing Role: Primary 5V buck regulator delivering stable rail from single Li-ion or 9V alkaline battery. Use Value: 12μA quiescent current and 100% duty cycle extend battery life beyond 1 year in intermittent-use devices. |
Use Scenario: Generating isolated 5V logic supply for PLC I/O modules and sensor transmitters in 24V factory automation systems. IC Role / Device Role / Timing Role: Local point-of-load converter stepping down 24V bus to clean 5V for digital isolators and ADCs. Use Value: 24V-rated internal MOSFET and 120mV dropout ensure reliable start-up and regulation even during brownout conditions. |
| 9V Battery Systems | Backup Supplies |
Use Scenario: Regulating 5V rail for memory retention and RTC backup in security panels and alarm controllers powered by 9V batteries. IC Role / Device Role / Timing Role: Low-quiescent, high-efficiency buck converter maintaining VDD during main power failure. Use Value: 3μA shutdown current preserves battery charge for >5 years in standby, meeting UL 1023 long-life requirements. |
Use Scenario: Providing hold-up power for SRAM and configuration EEPROM in telecom line cards during AC mains interruption. IC Role / Device Role / Timing Role: Secondary regulated 5V source activated via SHDN signal upon primary supply loss. Use Value: Fast startup (<100μs) and tight load regulation (0.3%) prevent data corruption during brief power gaps. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX1776ETA+ | Higher 500mA output, TDFN-8 package, 2.5V–24V input, no preset 5V option - requires external feedback resistors. | Targets higher-current loads (e.g., FPGA I/O banks); lacks pin-compatible preset mode; needs layout revision for 8-pin footprint. | Select when >250mA load current or tighter thermal performance is required; not drop-in for MAX1837EUT50-T. |
| TPS62231DRVR | 3MHz fixed-frequency PWM, 300mA output, 2.05–6.5V input, 5V preset available, 2.5μA IQ - narrower input range, lower max VIN. | Suitable for USB-powered or low-VIN systems only; cannot replace MAX1837EUT50-T in 12V/24V industrial applications. | Choose for cost-sensitive, low-input-voltage designs where 24V operation is unnecessary and higher switching frequency is preferred. |
Compared with MAX1776ETA+ and TPS62231DRVR, the MAX1837EUT50-T uniquely balances 24V input capability, 5V preset simplicity, SOT23 footprint, and ultra-low IQ - making it optimal for legacy 9V/12V/24V battery and industrial systems requiring minimal design change.
Availability
MAX1837EUT50-T is available at Aetrix Electronics and suitable for handheld devices, industrial control supplies, and 9V battery systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX1837EUT50-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, automotive, and communications markets.
The MAX1836/MAX1837 family was designed specifically for low-power, wide-input-voltage DC-DC conversion in battery-operated and distributed power systems - emphasizing efficiency at light loads, minimal external components, and robust operation across harsh voltage transients.
FAQ
What is the guaranteed output voltage tolerance of the MAX1837EUT50-T in preset mode?
The MAX1837EUT50-T guarantees a 5.0V output within ±4% (4.80V to 5.20V) over full temperature (-40°C to +85°C), input voltage (4.5V to 24V), and load (0 to 250mA) ranges. This specification is verified per Maxim's Electrical Characteristics table and applies specifically to the MAX1837EUT50-T variant with SOT23 packaging and factory-trimmed 5V setting.
Can the MAX1837EUT50-T operate with input voltages below 4.5V?
No - the MAX1837EUT50-T has an absolute minimum input voltage of 4.5V due to its internal undervoltage lockout (UVLO) threshold of 3.45–4.3V (falling). Operation below 4.5V risks failure to start or unregulated output. For sub-4.5V applications, consider alternatives like the MAX17503 or TPS62130, which support 2.7V–6.5V inputs.
How does the MAX1837EUT50-T achieve 100% duty cycle, and what is its practical impact?
The MAX1837EUT50-T achieves 100% duty cycle by holding its internal P-channel MOSFET continuously ON when the output approaches dropout - bypassing switching entirely. This reduces dropout voltage to just 120mV at 100mA, allowing sustained 5V regulation down to VIN = 5.12V, which significantly extends usable battery voltage range in 5V systems.
Is the exposed pad (EP) on the MAX1837EUT50-T package electrically connected, and how should it be handled?
Yes - the exposed pad on the MAX1837EUT50-T is internally connected to GND and must be soldered to a PCB ground plane. This connection provides essential thermal dissipation (derating starts at +70°C) and lowers ground impedance for noise-sensitive feedback paths. Leaving EP unconnected degrades thermal performance and may cause instability or premature thermal shutdown.
Does the MAX1837EUT50-T support adjustable output voltages, and if so, how is it configured?
Yes - the MAX1837EUT50-T supports adjustable output from 1.25V to VIN via external resistor divider on the FB pin. To enable this mode, connect OUT to GND and apply the divider between VOUT and FB. The feedback reference is 1.25V ±50mV; R2 should be 10kΩ–100kΩ, and R1 calculated as R1 = R2 × (VOUT/1.25 − 1). Note: output voltages above 5.5V require SHDN permanently tied to IN.
MAX1837EUT50-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Bulk
- Product Status:
- Active
- 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:
- 250mA
- Frequency - Switching:
- -
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-6
MAX1837EUT50-T FAQ
1.How can I place an order for MAX1837EUT50-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1837EUT50-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 MAX1837EUT50-T reliable?
The price and inventory of MAX1837EUT50-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1837EUT50-T is usually 5 days.
3.What payment methods are accepted for MAX1837EUT50-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1837EUT50-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1837EUT50-T?
MAX1837EUT50-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1837EUT50-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 MAX1837EUT50-T?
For technical support, including MAX1837EUT50-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1837EUT50-T requirements.
6.How does Aetrix verify that MAX1837EUT50-T is sourced from the original manufacturer or authorized distributors?
All MAX1837EUT50-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 MAX1837EUT50-T meets industry standards.
7.What is the process for return or replacement of MAX1837EUT50-T?
All MAX1837EUT50-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX1837EUT50-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 MAX1837EUT50-T part is unused and in its original packaging.
Return procedure for MAX1837EUT50-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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