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Analog Devices Inc./Maxim Integrated MAX1837EUT33#TG16
- Part No.:
- MAX1837EUT33#TG16
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SOT-23-6
- Datasheet:
-
MAX1837EUT33#TG16.pdf
- Description:
- IC REG BUCK 3.3V 250MA SOT6
- Quantity:
- Payment:
- Shipping:
Inventory:4,687
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Product details
Overview
The MAX1837EUT33#TG16 from Maxim Integrated is a high-efficiency, 6-pin SOT23 step-down DC-DC converter with preset 3.3V 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 targets space-constrained battery-powered systems such as handheld devices and industrial control supplies.
For engineers reviewing the MAX1837EUT33#TG16 datasheet, MAX1837EUT33#TG16 pinout, MAX1837EUT33#TG16 application, or MAX1837EUT33#TG16 equivalent, key selection criteria include its 12μA quiescent current, adjustable output mode (1.25V to VIN), thermal shutdown at 160°C, and compatibility with low-ESR ceramic or polymer output capacitors in compact layouts.
Technical Context
The MAX1837EUT33#TG16 employs a proprietary current-limited control architecture that dynamically adjusts switching frequency based on load-eliminating unnecessary switching under light loads to achieve 12μA no-load supply current. Its 100% maximum duty cycle enables operation down to 120mV dropout, critical for extending usable battery voltage range in 9V or multi-cell systems.
This device operates in discontinuous conduction mode (DCM) with fixed minimum off-time (0.2–0.6μs) and programmable maximum on-time (7–13μs), using internal current sensing and zero-crossing detection to regulate output. The feedback pin (FB) supports dual-mode operation: grounded for preset 3.3V output or connected to an external divider for adjustable regulation.
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 3.3V ±3.6% (3.168V–3.432V) - factory-trimmed for stable logic supply without external resistors. |
| Max Output Current | 250mA - sufficient for powering microcontrollers, sensors, and interface ICs in portable equipment. |
| Quiescent Current | 12μA - minimizes standby power loss, extending battery life in always-on or sleep-mode applications. |
| Dropout Voltage | 120mV at 100mA - enables regulation down to VIN = VOUT + 0.12V, maximizing usable battery capacity. |
| Shutdown Current | 3μA - ensures near-zero power draw during system hibernation or deep-sleep states. |
| Switch On-Resistance | 2Ω typical (VIN = 6V) - defines conduction loss and thermal dissipation under full load in SOT23 package. |
Pinout & Package
MAX1837EUT33#TG16 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. 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.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB (Pin 1) | Dual-mode feedback input | Grounded for preset 3.3V output; connected to resistive divider for adjustable output (1.25V–VIN); threshold is 1.25V ±4%. |
| GND (Pin 2) | Power and signal reference | Common return path for input, output, and internal circuitry; must be tied to EP for optimal thermal performance. |
| IN (Pin 3) | Main power input | Accepts 4.5V–24V; connects to source of internal P-MOSFET; requires local 10μF/25V ceramic or tantalum input capacitor. |
| LX (Pin 4) | Switch node | Drain of internal P-MOSFET; connects to inductor and catch diode; high dv/dt node requiring short, low-inductance layout. |
| SHDN (Pin 5) | Logic-controlled enable | Active-low shutdown: <0.8V disables regulator (3μA IQ); >2.4V enables; must not float-tie to IN if unused. |
| OUT (Pin 6) | Output sense terminal | Internally biased; 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, allowing continuous regulation even when VIN approaches VOUT - critical for end-of-life battery operation. |
| Current-limited control scheme | Eliminates fixed-frequency PWM losses; reduces no-load IQ to 12μA and enables variable-frequency DCM for high light-load efficiency. |
| Integrated 24V P-channel MOSFET | Removes need for external high-voltage switch; simplifies BOM and layout while supporting up to 24V input without level-shifting. |
| Thermal shutdown with 10°C hysteresis | Protects against sustained overloads by cycling the output at ~160°C junction temperature - prevents permanent damage during transient overcurrent events. |
| Dual-mode feedback (FB) | Supports both preset (GND) and adjustable (resistor divider) configurations in same footprint - enables flexible design reuse across multiple output requirements. |
Applications
| Handheld Devices | Industrial Control Supplies |
|---|---|
Use Scenario: Powering ARM Cortex-M microcontrollers, OLED displays, and BLE radios in compact medical testers and field meters. IC Role / Device Role / Timing Role: Primary 3.3V system rail regulator delivering up to 250mA with minimal board area and thermal overhead. Use Value: 12μA quiescent current extends battery runtime between calibrations; 100% duty cycle maintains regulation down to 3.42V input on aging alkaline cells. | Use Scenario: Providing isolated 3.3V logic supply for PLC I/O modules operating from 24V industrial bus rails. IC Role / Device Role / Timing Role: Point-of-load (POL) buck converter converting noisy 24V field power to clean 3.3V for digital isolators and ADC references. Use Value: 24V-rated internal MOSFET eliminates need for external HV pre-regulator; 120mV dropout ensures stable output during brownout conditions. |
| 9V Battery Systems | Backup Supplies |
Use Scenario: Regulating 9V alkaline or NiMH battery packs to 3.3V for portable data loggers with long shelf life. IC Role / Device Role / Timing Role: Main system regulator with shutdown control for firmware-initiated power gating during idle periods. Use Value: 3μA shutdown current preserves battery charge for years in storage; undervoltage lockout (3.55V rising) prevents erratic MCU behavior near EOL. | Use Scenario: Maintaining real-time clock (RTC) and SRAM backup power during main supply failure in telecom edge nodes. IC Role / Device Role / Timing Role: Secondary regulator fed from supercapacitor or coin cell, providing fault-tolerant 3.3V during AC loss. Use Value: Wide 4.5V–24V input accommodates decaying supercap voltage; thermal protection prevents overheating during extended backup cycles. |
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+T | Higher 500mA output, 24V internal switch, TDFN-8 package; no preset 3.3V option - requires external feedback. | Targets higher-current loads (e.g., FPGA I/O banks); lacks pin-compatible SOT23 footprint. | Select when >250mA is required and board area allows TDFN-8; verify feedback network for 3.3V accuracy. |
| TPS62231DRYT | 3MHz fixed-frequency PWM, 300mA output, 2.05–6.5V input; smaller 6-pin WSON package; no 24V rating. | Better suited for low-noise, high-PWM applications (e.g., RF modules); incompatible with >6.5V inputs. | Choose for noise-sensitive 3.3V rails powered from 3.3V/5V sources where size and EMI matter more than HV input. |
Compared with MAX1837EUT33#TG16, MAX1776ETA+T delivers double the current but requires redesign for feedback and layout; TPS62231DRYT offers superior ripple performance at lower voltage ranges but cannot replace it in 9V–24V battery or industrial applications.
Availability
MAX1837EUT33#TG16 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 MAX1837EUT33#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) designs precision analog, mixed-signal, and power management ICs for demanding industrial, automotive, and computing applications.
The MAX1836/MAX1837 product line was engineered specifically for high-input-voltage, low-quiescent-current step-down conversion in space- and battery-constrained systems - emphasizing dropout performance, thermal robustness, and ease of use in SOT23 form factor.
FAQ
What is the maximum input voltage supported by the MAX1837EUT33#TG16?
The MAX1837EUT33#TG16 supports an absolute maximum input voltage of 24V, with guaranteed operation from 4.5V to 24V. This wide range enables direct connection to 9V batteries, 12V industrial rails, and 24V backup supplies without external pre-regulation. Exceeding 24V risks permanent damage per Absolute Maximum Ratings.
Does the MAX1837EUT33#TG16 require external components to deliver its preset 3.3V output?
Yes, the MAX1837EUT33#TG16 requires three external components for basic operation: an input capacitor (≥10μF, 25V), an output capacitor (≥100μF, 6.3V low-ESR), and a Schottky catch diode (e.g., Nihon EP05Q03L). No external feedback resistors are needed for preset 3.3V mode - FB is grounded and OUT is connected to the regulated output.
How does the MAX1837EUT33#TG16 achieve 100% duty cycle, and what is its practical benefit?
The MAX1837EUT33#TG16 achieves 100% duty cycle by holding its internal P-channel MOSFET fully on when the input voltage approaches the output voltage - eliminating switching losses and minimizing dropout to just 120mV at 100mA. This extends usable battery life in 9V systems by maintaining regulation down to VIN ≈ 3.42V, well beyond conventional buck converters.
What thermal protection features are built into the MAX1837EUT33#TG16?
The MAX1837EUT33#TG16 includes thermal shutdown with activation at TJ = +160°C and 10°C hysteresis. When triggered, the internal pass transistor cycles on/off to limit average power dissipation, preventing irreversible damage during sustained overload or poor heatsinking. The SOT23 package's 8.7mW/°C derating above +70°C further defines safe continuous operation limits.
Can the MAX1837EUT33#TG16 be used in adjustable-output configurations, and how is the output voltage set?
Yes, the MAX1837EUT33#TG16 supports adjustable output from 1.25V to VIN via its FB pin. To configure: tie OUT to GND, connect FB to a resistor divider between VOUT and GND, and calculate R1 using R1 = R2 × (VOUT/VFB − 1), where VFB = 1.25V. For outputs >5.5V, SHDN must be permanently tied to IN to disable shutdown functionality.
MAX1837EUT33#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):
- 3.3V
- 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
MAX1837EUT33#TG16 FAQ
1.How can I place an order for MAX1837EUT33#TG16 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1837EUT33#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 MAX1837EUT33#TG16 reliable?
The price and inventory of MAX1837EUT33#TG16 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1837EUT33#TG16 is usually 5 days.
3.What payment methods are accepted for MAX1837EUT33#TG16?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1837EUT33#TG16 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1837EUT33#TG16?
MAX1837EUT33#TG16 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1837EUT33#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 MAX1837EUT33#TG16?
For technical support, including MAX1837EUT33#TG16 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1837EUT33#TG16 requirements.
6.How does Aetrix verify that MAX1837EUT33#TG16 is sourced from the original manufacturer or authorized distributors?
All MAX1837EUT33#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 MAX1837EUT33#TG16 meets industry standards.
7.What is the process for return or replacement of MAX1837EUT33#TG16?
All MAX1837EUT33#TG16 units undergo pre-shipment inspection (PSI). If there is an issue with MAX1837EUT33#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 MAX1837EUT33#TG16 part is unused and in its original packaging.
Return procedure for MAX1837EUT33#TG16:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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