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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 BUCK ADJ/1.25V 250MA SOT6
- Quantity:
- Payment:
- Shipping:
Inventory:2,020
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Product details
Overview
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 considerations include its fixed 5V output mode, SOT23 package footprint, 100% duty-cycle dropout performance, shutdown threshold (0.8–2.4V), and compatibility with low-ESR ceramic or polymer output capacitors in compact power designs.
Technical Context
The MAX1837EUT50+T employs a proprietary current-limited control architecture that dynamically adjusts switching frequency based on load-eliminating unnecessary switching under light loads to maintain 12μA supply current. Its 100% duty-cycle capability enables continuous conduction down to VIN − VOUT = 120mV, critical for extending usable battery voltage range in 9V or multi-cell systems.
This device operates without external compensation, using internal current sensing and zero-crossing detection (±75mV threshold) to manage discontinuous-conduction-mode transitions. The LX pin drives an external inductor (e.g., 47µH), while FB and OUT pins configure preset vs. adjustable modes-FB grounded and OUT connected to regulated output for fixed 5.0V operation.
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 pre-regulation. |
| Output Voltage (Preset) | 4.80V to 5.20V (typ 5.00V) - factory-trimmed 5V output with ±4% tolerance over temperature and load (0–250mA). |
| Max Output Current | 250mA - sustained load capability enabled by internal 24V P-MOSFET with 2Ω typical on-resistance (VIN = 6V). |
| Quiescent Current | 12μA - enables >1-year battery life in always-on sensor nodes or backup supplies with minimal standby drain. |
| Dropout Voltage | 120mV at 100mA - minimum VIN–VOUT differential achievable via 100% duty cycle, extending usable input range near end-of-life battery voltage. |
| Shutdown Current | 3μA - ultra-low disable-state leakage preserves battery energy during system sleep or hibernation modes. |
| Switching Frequency | Variable (≈1–2 MHz typical) - load-dependent frequency avoids fixed PWM losses; enables use of small 47µH inductors and 68–150µF output caps. |
Pinout & Package
MAX1837EUT50+T is housed in a RoHS-compliant 6-pin SOT23 package (3.0mm × 1.7mm × 1.3mm), with exposed pad (EP) internally connected to GND for thermal and electrical integrity. The package requires standard reflow profile and PCB land pattern per Maxim's SOT23-6 EP drawing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 FB | Dual-mode feedback input | Grounded to select preset 5.0V output; connects to resistive divider for adjustable mode (1.25V–VIN); dual-threshold (50–150mV) enables noise-immune regulation. |
| 2 GND | Power and signal ground reference | Primary return path for internal MOSFET, error amplifier, and bias circuits; must be tied to EP pad for optimal thermal performance. |
| 3 IN | Main power input | Accepts 4.5V–24V; supplies internal circuitry and source of P-MOSFET; UVLO triggers at 3.45–4.4V (falling/rising). |
| 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-controlled enable/disable | Active-low input; <0.8V disables IC (3μA ISHDN); >2.4V enables; slew rate >10V/ms required; tie to IN if unused. |
| 6 OUT | Output sense/feedback reference | Internally biased divider tap; connect to regulated output in preset mode; tie to GND in adjustable mode to disable internal divider. |
Key Features
| Feature | Design Value |
|---|---|
| 100% duty-cycle operation | Enables lowest possible dropout voltage (120mV @ 100mA), maximizing usable input voltage range in battery systems. |
| 12μA no-load supply current | Reduces standby power loss in always-on applications-e.g., remote sensors or real-time clocks-without compromising startup time. |
| Internal 24V P-channel MOSFET | Eliminates need for external high-voltage switch; simplifies BOM and layout while supporting up to 24V input directly. |
| Dual-mode FB pin | Single-pin configuration for either preset (GND) or adjustable (resistor divider) output-reduces design variants and inventory SKUs. |
| Thermal shutdown with 10°C hysteresis | Protects against sustained overload or poor heatsinking; auto-recovery prevents latch-up and enables graceful fault handling. |
Applications
| Handheld Medical Devices | Industrial Sensor Nodes |
|---|---|
|
Use Scenario: Portable blood glucose meters or pulse oximeters powered by single 9V alkaline or dual Li-ion cells. IC Role / Device Role / Timing Role: Primary 5V supply for microcontroller, analog front-end, and LCD backlight driver. Use Value: 100% duty cycle extends operational runtime by 18–22% compared to conventional buck converters when battery drops below 5.5V. |
Use Scenario: Wireless temperature/humidity transmitters mounted in factory environments with 12–24V DC distribution rails. IC Role / Device Role / Timing Role: Local 5V rail for low-power MCU, RF transceiver (e.g., Si4463), and precision ADC. Use Value: 24V-rated input and 250mA output support direct connection to industrial power buses without intermediate regulators. |
| Backup Power Supplies | 4–20mA Loop-Powered Instruments |
|
Use Scenario: Nonvolatile memory retention or RTC backup during main power failure in PLC modules. IC Role / Device Role / Timing Role: Standby 5V source charged from primary rail via diode OR-ing; activated only during outage. Use Value: 3μA shutdown current ensures >5-year capacitor hold-up time using standard 0.47F supercapacitors. |
Use Scenario: Two-wire field transmitters (pressure, flow) deriving power from 4–20mA loop while delivering 5V to signal conditioning circuitry. IC Role / Device Role / Timing Role: High-efficiency step-down stage converting loop-derived ~16V to stable 5V for op-amps and DACs. Use Value: >90% efficiency at 10–50mA load minimizes loop voltage drop, preserving compliance margin for 24V supply headroom. |
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 and larger inductor. | Supports higher-current loads (e.g., motor drivers, multiple peripherals) where MAX1837EUT50+T's 250mA limit is insufficient. | Select MAX1776ETT50+T when >300mA peak load or lower thermal resistance is required; accept added BOM cost and layout area. |
| TPS62231DRYT | 3MHz fixed-frequency PWM, 300mA output, 2.05–6.0V input, 5V preset, smaller 2mm × 2mm WSON package. | Better suited for ultra-compact, high-density layouts (e.g., wearables); lacks 100% duty cycle and 24V input capability. | Choose TPS62231DRYT for space-critical 3–5.5V systems where 24V input and ultra-low dropout are not needed. |
Compared with MAX1776ETT50+T and TPS62231DRYT, the MAX1837EUT50+T uniquely balances 24V input tolerance, 100% duty-cycle dropout, SOT23 footprint, and 250mA capability-making it optimal for cost-sensitive, battery-backed industrial and portable equipment where input voltage headroom is constrained.
Availability
MAX1837EUT50+T is available at Aetrix Electronics and suitable for handheld medical devices, industrial sensor nodes, backup power supplies, and 4–20mA loop-powered instruments 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, communications, and computing markets.
The MAX1836/MAX1837 family was designed specifically for low-power, wide-input battery and industrial DC-DC conversion-emphasizing ultra-low quiescent current, 100% duty-cycle operation, and integrated high-voltage switching in minimal footprints.
FAQ
What is the guaranteed output voltage tolerance for MAX1837EUT50+T in preset 5V mode?
The MAX1837EUT50+T guarantees a 5.0V output within ±4% (4.80V to 5.20V) across full operating temperature (−40°C to +85°C) and load range (0–250mA), as specified in the Electrical Characteristics table under "Output Voltage (Preset Mode)" with conditions FB = GND.
Can MAX1837EUT50+T operate with input voltage below 4.5V?
No. The MAX1837EUT50+T has a hard input undervoltage lockout (UVLO) threshold of 3.45–4.4V (falling/rising). Below 4.5V, the device will not start or sustain regulation. For sub-4.5V operation, consider alternatives like the MAX17503 or TPS62130A.
Does MAX1837EUT50+T require external compensation components?
No. The MAX1837EUT50+T uses a proprietary current-limited hysteretic control scheme with internal compensation. No external RC networks or compensation pins are needed-simplifying design and reducing bill-of-materials count.
What is the maximum allowable voltage on the LX pin relative to GND?
The absolute maximum rating for LX-to-GND voltage is −2V to (VIN + 0.3V). During normal operation, LX swings between GND (MOSFET on) and VIN (MOSFET off, inductor flyback). Exceeding these limits risks permanent damage to the internal P-MOSFET or bond wires.
How does the shutdown function behave when output voltage exceeds 5.5V?
When configured for adjustable output above 5.5V, the shutdown feature cannot be used-the SHDN pin must be permanently tied to IN. This restriction is due to internal voltage limitations on the SHDN input structure; violating it may cause malfunction or damage to the MAX1837EUT50+T.
MAX1837EUT50+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Tape & Reel (TR)
- 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-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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