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Analog Devices Inc./Maxim Integrated MAX1837EUT50#G16
- Part No.:
- MAX1837EUT50#G16
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SOT-23-6
- Datasheet:
-
MAX1837EUT50#G16.pdf
- Description:
- IC REG BUCK ADJ/1.25V 250MA SOT6
- Quantity:
- Payment:
- Shipping:
Inventory:1,251
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Product details
Overview
The MAX1837EUT50#G16 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 maximum load current, 12μA quiescent current, and 100% duty-cycle operation enabling ultra-low dropout (120mV at 100mA). It integrates a 24V-rated internal P-channel MOSFET and targets space-constrained, battery-powered systems such as handheld devices and industrial control supplies.
For engineers reviewing the MAX1837EUT50#G16 datasheet, MAX1837EUT50#G16 pinout, MAX1837EUT50#G16 application, or MAX1837EUT50#G16 equivalent, key selection criteria include its fixed 5V output mode, SOT23 package footprint, shutdown-controlled 3μA sleep current, and compatibility with low-ESR ceramic or polymer output capacitors in compact 5V point-of-load designs.
Technical Context
The MAX1837EUT50#G16 employs a proprietary current-limited control architecture that dynamically adjusts switching frequency based on load-eliminating unnecessary switching under light loads to sustain 12μA supply current. Its 100% duty-cycle capability enables regulation down to VIN − VDROPOUT, where dropout is determined by ILIM × (RLX + RINDUCTOR).
This device operates in discontinuous conduction mode (DCM) with variable-frequency pulse-on-demand control: the internal P-channel MOSFET turns on until either the current limit (625mA typ) or maximum on-time (10μs typ) is reached, then turns off for a minimum 0.4μs off-time before restarting if output voltage falls below regulation threshold.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 5.00V ±2% (preset mode, FB = GND), stable across 0–250mA load and 4.5–24V input |
| Input Voltage Range | 4.5V to 24V - supports 9V batteries, 12V industrial rails, and 24V backup supplies without external regulators |
| Max Output Current | 250mA - limited by internal 625mA current-sense threshold and thermal dissipation in SOT23 package |
| Quiescent Current | 12μA - enables multi-year battery life in always-on sensor nodes or low-power standby circuits |
| Dropout Voltage | 120mV at 100mA - enables usable operation down to VIN = 5.12V, extending battery end-of-life in 5V systems |
| Shutdown Current | 3μA - reduces system-level leakage during deep sleep, critical for energy-harvesting or coin-cell applications |
| Switching Frequency | Variable (≈1–2MHz typical) - eliminates EMI peaks and allows use of small 22–47μH inductors and 10–100μF ceramic outputs |
Pinout & Package
MAX1837EUT50#G16 is housed in a RoHS-compliant 6-pin SOT23 package (JEDEC MO-178AA) with exposed pad (EP) internally connected to GND for thermal and electrical integrity. The package measures 2.9mm × 1.6mm × 1.1mm and requires standard SOT23 land pattern with EP soldered to PCB ground plane.
| 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–VIN); dual-mode threshold at 100mV |
| 2 - GND | Power and signal reference | Common return for internal circuitry, LX switch, and EP pad; must be star-connected to minimize noise coupling |
| 3 - IN | Main power input | Supplies 4.5–24V; connects to source of internal P-MOSFET; requires local 10μF/25V ceramic or aluminum input capacitor |
| 4 - LX | Switch node | Drain of internal P-MOSFET; drives external inductor; high di/dt node requiring short, wide trace and tight loop with CIN/COUT/D1 |
| 5 - SHDN | Logic-controlled enable/disable | Active-low input; <0.8V shuts down IC to 3μA; >2.4V enables operation; must not float; tied to IN if VOUT >5.5V |
| 6 - OUT | Output sense terminal | Internally connected to feedback divider; tied to regulated output in preset mode; grounded in adjustable mode |
Key Features
| Feature | Design Value |
|---|---|
| 100% duty-cycle operation | Enables regulation with VIN as low as VOUT + 120mV, maximizing usable battery voltage range in 5V systems |
| Current-limited control architecture | Eliminates fixed-frequency PWM losses; reduces IIN to 12μA at no load and 3μA in shutdown |
| Integrated 24V P-channel MOSFET | Removes need for external high-voltage switch; simplifies BOM and layout while supporting up to 24V input rails |
| Dual-mode feedback (FB pin) | Supports both factory-preset 5V (FB = GND) and adjustable output (FB = divider) without external components |
| Thermal-overload protection | Shuts down internal switch at TJ = +160°C with 10°C hysteresis, preventing damage during sustained overload or poor heatsinking |
Applications
| Handheld Medical Devices | Industrial Sensor Transmitters |
|---|---|
|
Use Scenario: Portable blood glucose meters and pulse oximeters powered by single 9V alkaline or dual AA cells. IC Role / Device Role / Timing Role: Primary 5V point-of-load regulator supplying microcontroller, display, and analog front-end from unregulated battery input. Use Value: 12μA quiescent current extends shelf life and operational runtime; 100% duty cycle sustains 5V output down to 5.12V input, extracting full battery capacity. |
Use Scenario: 4–20mA loop-powered temperature/pressure transmitters mounted in hazardous areas. IC Role / Device Role / Timing Role: Isolated 5V supply for signal conditioning, ADC, and HART modem within strict loop power budget. Use Value: 250mA output current supports active sensors and digital comms; 3μA shutdown current preserves loop compliance during configuration mode. |
| Backup Power Supplies | Low-Power Notebook Subsystems |
|
Use Scenario: Always-on real-time clock (RTC) and SRAM retention circuits backed by supercapacitors or coin cells. IC Role / Device Role / Timing Role: Ultra-low-IQ 5V regulator maintaining memory and timekeeping during main power failure. Use Value: 12μA operating current minimizes backup source depletion; SOT23 footprint fits tight board areas near RTC ICs. |
Use Scenario: Auxiliary 5V rail for USB-C PD controllers, EC firmware, or embedded security modules in ultrabooks. IC Role / Device Role / Timing Role: Secondary regulated supply decoupled from main CPU VRM, enabling independent power sequencing. Use Value: High efficiency (>90% at 100mA) reduces localized heating near sensitive RF sections; 24V tolerance accommodates adapter surges. |
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 requires external 24V-rated Schottky diode | Better suited for higher-current 5V rails (e.g., FPGA I/O banks); larger footprint and added BOM cost | Select when load exceeds 250mA and board area permits TDFN; avoid if SOT23 footprint or diode-free design is mandatory |
| TPS62231DRYR | 3MHz fixed-frequency PWM, 300mA output, 2.05–6.5V input, 5V preset, smaller 2mm × 2mm WSON | Superior light-load efficiency via DCS-Control™, but lacks 24V input support and 100% duty cycle | Prefer for 3–5V input systems needing ultra-small size and tighter ripple; reject for 9–24V battery or industrial rails |
Compared with MAX1837EUT50#G16, MAX1776ETT50+T delivers double the current at the cost of added diode and larger package, while TPS62231DRYR offers higher integration and smaller size but cannot operate from 9–24V inputs or achieve true dropout-limited operation.
Availability
MAX1837EUT50#G16 is available at Aetrix Electronics and suitable for handheld medical devices, industrial sensor transmitters, backup power supplies, and low-power notebook subsystems requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for MAX1837EUT50#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 computing applications.
The MAX1836/MAX1837 product line was designed specifically for ultra-low-quiescent-current, high-input-voltage step-down conversion in battery-powered and distributed power systems where minimal dropout and extended runtime are critical.
FAQ
What is the guaranteed output voltage accuracy of the MAX1837EUT50#G16 in preset 5V mode?
The MAX1837EUT50#G16 guarantees a 5.00V output with ±2% 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 and VIN ≥ 5.5V.
Can the MAX1837EUT50#G16 operate from a 5V input while delivering 5V output?
Yes - the MAX1837EUT50#G16 supports 100% duty-cycle operation, allowing it to maintain regulation with VIN as low as VOUT + VDROPOUT. At 100mA load, dropout is 120mV, so the MAX1837EUT50#G16 can deliver regulated 5V output from a 5.12V input, making it viable for post-regulation or margin-testing scenarios.
What is the recommended inductor value for the MAX1837EUT50#G16 in a 5V-output, 12V-input application?
For a 5V-output, 12V-input application, the MAX1837EUT50#G16 datasheet recommends a 47μH inductor (e.g., Sumida CDRH5D28-470), rated for ≥625mA saturation current and low DC resistance (<1.1Ω), to ensure stable DCM operation, acceptable peak current, and minimal dropout voltage under full 250mA load.
Does the MAX1837EUT50#G16 require an external Schottky diode, and what are the key selection criteria?
Yes - the MAX1837EUT50#G16 requires an external Schottky diode (e.g., Nihon EP05Q03L) connected between LX and GND. Key criteria include: 0.5A RMS current rating, reverse breakdown >24V, fast turn-on, low forward voltage (<0.4V at 250mA), and low leakage for high-temperature operation.
How does the shutdown function behave when the MAX1837EUT50#G16 is configured for adjustable output above 5.5V?
When the MAX1837EUT50#G16 is configured for adjustable output above 5.5V, the shutdown feature is disabled per datasheet Note 2; SHDN must be permanently tied to IN to prevent malfunction. This restriction ensures internal voltage limits are not exceeded, and the MAX1837EUT50#G16 operates only in always-on mode for high-VOUT configurations.
MAX1837EUT50#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:
- 250mA
- Frequency - Switching:
- -
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-6
MAX1837EUT50#G16 FAQ
1.How can I place an order for MAX1837EUT50#G16 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1837EUT50#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 MAX1837EUT50#G16 reliable?
The price and inventory of MAX1837EUT50#G16 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1837EUT50#G16 is usually 5 days.
3.What payment methods are accepted for MAX1837EUT50#G16?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1837EUT50#G16 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1837EUT50#G16?
MAX1837EUT50#G16 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1837EUT50#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 MAX1837EUT50#G16?
For technical support, including MAX1837EUT50#G16 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1837EUT50#G16 requirements.
6.How does Aetrix verify that MAX1837EUT50#G16 is sourced from the original manufacturer or authorized distributors?
All MAX1837EUT50#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 MAX1837EUT50#G16 meets industry standards.
7.What is the process for return or replacement of MAX1837EUT50#G16?
All MAX1837EUT50#G16 units undergo pre-shipment inspection (PSI). If there is an issue with MAX1837EUT50#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 MAX1837EUT50#G16 part is unused and in its original packaging.
Return procedure for MAX1837EUT50#G16:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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