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Analog Devices Inc./Maxim Integrated MAX1837EUT33#G16
- Part No.:
- MAX1837EUT33#G16
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SOT-23-6
- Datasheet:
-
MAX1837EUT33#G16.pdf
- Description:
- IC REG BUCK ADJ/1.25V 250MA SOT6
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
The MAX1837EUT33#G16 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 delivers >90% efficiency in space-constrained battery-powered systems like handheld devices and industrial control supplies.
For engineers reviewing the MAX1837EUT33#G16 datasheet, MAX1837EUT33#G16 pinout, MAX1837EUT33#G16 application, or MAX1837EUT33#G16 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#G16 employs a proprietary current-limited control architecture that dynamically adjusts switching frequency based on load-eliminating unnecessary switching under light loads and reducing no-load supply current to 12μA. Its 100% duty-cycle capability enables continuous conduction down to minimal VIN–VOUT differential, directly supporting extended battery runtime in 9V and multi-cell systems.
This device operates with internal current sensing and zero-crossing detection (±75mV threshold), uses a fixed 1.25V feedback reference, and features dual-mode FB pin functionality: grounded for preset 3.3V output or connected to a resistive divider for adjustable regulation. Shutdown input (SHDN) reduces current to 3μA and isolates LX from IN.
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 regulators. |
| Output Voltage | Preset 3.3V ±3.6% (3.168V–3.432V) - factory-trimmed for stable logic-level supply without external feedback components. |
| Max Output Current | 250mA - sufficient for powering microcontrollers, sensors, and low-power peripherals in portable equipment. |
| Quiescent Current | 12μA - minimizes standby power loss, extending battery life in always-on or infrequently active applications. |
| Dropout Voltage | 120mV at 100mA - enables operation down to VIN = 3.42V while maintaining 3.3V output, critical for end-of-life battery voltage utilization. |
| Switching Frequency | Variable (≈1–2 MHz typical) - scales with load to maintain high efficiency across 0.1–250mA range; eliminates need for external frequency-setting components. |
| Thermal Shutdown | 160°C with 10°C hysteresis - protects against sustained overload or poor PCB thermal design without requiring external thermal monitoring. |
Pinout & Package
MAX1837EUT33#G16 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 enhanced thermal dissipation and grounding integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - FB | Dual-mode feedback input | Grounded for preset 3.3V output; connected to resistive divider for adjustable output (1.25V–VIN); includes 100mV dual-mode threshold for seamless transition. |
| 2 - GND | Power and signal ground reference | Common return path for internal circuitry, LX switch, and EP pad; must be star-connected to minimize noise coupling into feedback loop. |
| 3 - IN | Main power input | Supplies 4.5V–24V; connects to source of internal 24V P-channel MOSFET; requires local 10µF/25V ceramic or low-ESR capacitor. |
| 4 - LX | Switch node | Drain of internal P-MOSFET; drives external inductor (e.g., 22µH or 47µH); carries high di/dt current-requires short, wide trace and tight layout with D1/COUT. |
| 5 - SHDN | Logic-controlled enable/disable | Active-low input; <0.8V disables IC (3μA shutdown current); >2.4V enables; must not float-tie to IN if unused or for >5.5V outputs. |
| 6 - OUT | High-impedance output sense | Internally tied to feedback divider; connect to regulated output for preset mode; tie to GND when using external feedback to disable internal divider. |
Key Features
| Feature | Design Value |
|---|---|
| 100% duty-cycle operation | Enables lowest possible dropout voltage (120mV @100mA), maximizing usable battery voltage range in 9V and multi-cell systems. |
| Current-limited control architecture | Eliminates fixed-frequency PWM losses; reduces no-load current to 12μA and enables variable-frequency operation for optimal 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. |
| Dual-mode FB pin | Supports both preset (GND) and adjustable (resistive divider) configurations in same footprint-enables flexible design reuse across voltage variants. |
| Thermal-overload protection | Auto-recovers after 10°C cooldown (160°C trip); prevents catastrophic failure during sustained overload or inadequate heatsinking. |
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 3.3V system regulator delivering 250mA peak current with ultra-low quiescent draw to extend single-battery operation beyond 100 hours. Use Value: 12μA IQ and 100% duty cycle allow full functionality down to 3.42V input-extending usable battery capacity by ~18% versus conventional buck converters. | Use Scenario: Providing isolated 3.3V supply for PLC I/O modules, sensor transmitters, and 4–20mA loop interfaces in factory automation. IC Role / Device Role / Timing Role: Input-stage DC-DC converter accepting 12–24V industrial rail and rejecting line transients via robust 24V-rated internal switch and thermal shutdown. Use Value: 24V input rating and 160°C thermal protection ensure reliable operation in unregulated environments where ambient temperatures exceed 70°C. |
| 9V Battery Systems | Backup Supplies |
Use Scenario: Regulating alkaline or Li-ion 9V packs for portable medical monitors, barcode scanners, and wireless sensors. IC Role / Device Role / Timing Role: High-efficiency step-down regulator maintaining stable 3.3V output across full battery discharge curve (9V → 4.5V). Use Value: >90% efficiency at 100mA and 120mV dropout preserve battery energy-enabling 2× longer runtime than linear regulators at same load. | Use Scenario: Delivering hold-up power to real-time clocks, SRAM, and configuration memory during main supply interruption in telecom and server management cards. IC Role / Device Role / Timing Role: Low-quiescent, fast-startup DC-DC converter activated by SHDN pin to sustain critical circuits during brownout events. Use Value: 3μA shutdown current and <100µs startup time (per Figure 17) ensure minimal backup capacitor size and rapid recovery post-interruption. |
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, same 6-pin TDFN package; no SOT23 option; 15μA IQ. | Targets higher-current loads (e.g., FPGA I/O banks); requires larger inductor (10µH) and different layout due to TDFN thermal pad. | Select when >250mA sustained current is required and board space allows TDFN footprint. |
| TPS62231DRYT | 3MHz fixed-frequency PWM, 300mA output, 2.05–6.5V input; smaller 2mm × 2mm WSON; 17μA IQ; no 100% duty cycle. | Better suited for low-input, high-frequency apps (e.g., USB-powered devices); lacks high-voltage capability and ultra-low dropout. | Choose for compact, low-VIN designs where 24V operation and sub-120mV dropout are not required. |
Compared with MAX1776ETA+T and TPS62231DRYT, the MAX1837EUT33#G16 uniquely balances 24V input tolerance, 100% duty-cycle dropout performance, and SOT23 footprint-making it optimal for cost-sensitive, battery-derived 3.3V rails where thermal headroom and layout simplicity are prioritized over peak current or switching frequency.
Availability
MAX1837EUT33#G16 is available at Aetrix Electronics and suitable for handheld devices, industrial control supplies, 9V battery systems, and backup supplies requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX1837EUT33#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 markets.
The MAX1836/MAX1837 product line was designed specifically for low-power, high-input-voltage DC-DC conversion in battery-powered and distributed power systems-emphasizing ultra-low IQ, 100% duty cycle, and integrated high-voltage switches.
FAQ
What is the maximum output current supported by the MAX1837EUT33#G16?
The MAX1837EUT33#G16 supports up to 250mA of continuous output current under typical conditions (TA = +25°C, VIN ≥ 5V). This rating is validated across the full –40°C to +85°C operating temperature range and accounts for thermal derating in the 6-pin SOT23 package. Peak inductor current capability exceeds 625mA, but sustained output is limited by package power dissipation and junction temperature rise.
Does the MAX1837EUT33#G16 require external feedback resistors for 3.3V operation?
No-the MAX1837EUT33#G16 is factory-configured for preset 3.3V output. To use this mode, connect the FB pin to GND and the OUT pin to the regulated output node. External resistors are only needed when adjusting the output voltage outside the preset range (1.25V to VIN), in which case OUT must be tied to GND and a resistor divider placed between VOUT and FB.
What is the dropout voltage specification for the MAX1837EUT33#G16, and how is it achieved?
The MAX1837EUT33#G16 achieves a dropout voltage of 120mV at 100mA load, defined as the minimum VIN–VOUT differential before regulation fails. This is enabled by its 100% duty-cycle control architecture, which keeps the internal P-channel MOSFET fully on when VIN approaches VOUT-effectively operating as a low-RDS(ON) pass element rather than a switching regulator.
Can the MAX1837EUT33#G16 be used in shutdown mode, and what is its shutdown current?
Yes-the MAX1837EUT33#G16 supports active-low shutdown via the SHDN pin. When pulled below 0.8V, the device enters shutdown mode with total supply current reduced to 3μA (max), LX goes to high impedance, and the output is isolated from the input. The SHDN pin must not be left floating; if unused, connect it to IN to ensure normal operation.
What package type and thermal characteristics apply to the MAX1837EUT33#G16?
The MAX1837EUT33#G16 uses a 6-pin SOT23 package with an exposed thermal pad (EP) internally connected to GND. At TA = +70°C, its continuous power dissipation is 696mW, derating at 8.7mW/°C above that temperature. The EP pad must be soldered to a minimum 1in² copper area on the PCB to meet thermal specifications and ensure reliable operation up to +85°C ambient.
MAX1837EUT33#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 (3.3V)
- 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
MAX1837EUT33#G16 FAQ
1.How can I place an order for MAX1837EUT33#G16 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1837EUT33#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 MAX1837EUT33#G16 reliable?
The price and inventory of MAX1837EUT33#G16 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1837EUT33#G16 is usually 5 days.
3.What payment methods are accepted for MAX1837EUT33#G16?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1837EUT33#G16 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1837EUT33#G16?
MAX1837EUT33#G16 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1837EUT33#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 MAX1837EUT33#G16?
For technical support, including MAX1837EUT33#G16 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1837EUT33#G16 requirements.
6.How does Aetrix verify that MAX1837EUT33#G16 is sourced from the original manufacturer or authorized distributors?
All MAX1837EUT33#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 MAX1837EUT33#G16 meets industry standards.
7.What is the process for return or replacement of MAX1837EUT33#G16?
All MAX1837EUT33#G16 units undergo pre-shipment inspection (PSI). If there is an issue with MAX1837EUT33#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 MAX1837EUT33#G16 part is unused and in its original packaging.
Return procedure for MAX1837EUT33#G16:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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