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Analog Devices Inc./Maxim Integrated MAX1837ETT50+T
- Part No.:
- MAX1837ETT50+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 6-WDFN Exposed Pad
- Datasheet:
-
MAX1837ETT50+T.pdf
- Description:
- IC REG BUCK 5V 250MA 6TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,427
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Product details
Overview
The MAX1837ETT50+T from Maxim Integrated is a high-efficiency, 6-pin TDFN-packaged step-down DC-DC converter with preset 5.0V 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-rated internal P-channel MOSFET and targets space-constrained, battery-powered systems requiring stable low-noise 5V rails.
For engineers reviewing the MAX1837ETT50+T datasheet, MAX1837ETT50+T pinout, MAX1837ETT50+T application, or MAX1837ETT50+T equivalent, key selection considerations include its 12μA quiescent current, adjustable output mode (1.25V to VIN), thermal shutdown at 160°C, and compatibility with compact surface-mount inductors and ceramic capacitors in industrial and portable designs.
Technical Context
The MAX1837ETT50+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 operation down to VIN = VOUT + 120mV, making it suitable for end-of-battery-life conditions in 9V and multi-cell systems.
This device uses internal current sensing and zero-crossing detection to regulate inductor current, with fixed maximum on-time (7–13µs) and minimum off-time (0.2–0.6µs) constraints. The FB pin supports dual-mode operation-grounded for preset 5.0V output or connected to an external divider for adjustable outputs up to VIN, with VFB = 1.25V ±50mV reference accuracy.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage (Preset) | 5.00V ±4% (4.80–5.20V); factory-trimmed for stable 5V rail without external resistors |
| Max Output Current | 250mA continuous; defined by internal 500–900mA current limit and thermal limits in 3×3mm TDFN |
| Input Voltage Range | 4.5V to 24V; supports wide-input industrial supplies and multi-cell battery stacks |
| Quiescent Current | 12μA typical at no load; enables >1-year battery life in always-on sensor nodes |
| Dropout Voltage | 120mV at 100mA load; enables regulation down to VIN = 5.12V, extending usable battery voltage range |
| Switching Frequency | Variable (≈1–2MHz typical); increases with load to maintain regulation without fixed-frequency EMI peaks |
| Shutdown Current | 3μA max; reduces system standby power when host controller asserts SHDN low |
Pinout & Package
MAX1837ETT50+T is housed in a 6-pin, 3mm × 3mm, 0.75mm-thick TDFN package with exposed pad (EP) for thermal and electrical grounding. The EP must be soldered to a PCB ground plane for optimal thermal performance (1951mW max power dissipation at +70°C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 FB | Dual-mode feedback input | Grounded for preset 5.0V output; connected to resistor divider for adjustable outputs (1.25V–VIN); 1.25V reference threshold with ±50mV hysteresis |
| 2 GND | Power and signal ground | Common return for internal circuitry, LX switch, and EP pad; requires low-impedance connection to minimize noise coupling |
| 3 IN | Main input supply | Accepts 4.5V–24V; powers internal bias circuits and connects to source of internal P-MOSFET; UVLO triggers at 3.45–4.4V |
| 4 LX | Switch node | Drain of internal 24V P-MOSFET; connects to inductor; rated for −2V to (VIN + 0.3V); zero-crossing detection enables synchronous rectification emulation |
| 5 SHDN | Active-low enable/shutdown | Pull low ≤0.8V to enter 3μA shutdown; pull high ≥2.4V or tie to IN for normal operation; slew rate >10V/ms required |
| 6 OUT | High-impedance output sense | Internally tied to feedback divider; connect to regulated output in preset mode; tie to GND in adjustable mode |
Key Features
| Feature | Design Value |
|---|---|
| 100% duty-cycle operation | Enables dropout as low as 120mV, maximizing usable input voltage range in battery systems |
| 12μA no-load supply current | Extends runtime in always-on applications such as remote sensors and backup supplies |
| Internal 24V P-channel MOSFET | Eliminates need for external high-voltage switch; simplifies BOM and layout for 24V-input designs |
| Dual-mode FB pin | Supports both factory-preset 5.0V and user-adjustable outputs (1.25V–VIN) with single pin |
| Thermal shutdown with 10°C hysteresis | Protects against sustained overload; auto-recovery prevents latch-up during transient overloads |
Applications
| 9V Battery Systems | Notebook Computers |
|---|---|
Use Scenario: Powering microcontrollers and I/O peripherals from alkaline or NiMH 9V batteries. IC Role / Device Role / Timing Role: Primary 5V step-down regulator delivering up to 250mA with minimal dropout as battery discharges from 9V to 5.1V. Use Value: Enables full system operation down to 5.12V input, extending usable battery life by ~18% compared to converters with higher dropout. |
Use Scenario: Supplying auxiliary 5V rails for USB ports, card readers, or embedded controllers in compact notebooks. IC Role / Device Role / Timing Role: Secondary DC-DC converter operating from main 12V or 19V bus, providing isolated, low-noise 5V output. Use Value: 3×3mm TDFN footprint saves board area; 12μA quiescent current minimizes standby drain during sleep states. |
| Distributed Power Systems | Industrial Control Supplies |
Use Scenario: Local point-of-load regulation in PLC backplanes or modular I/O systems with 24V backbone. IC Role / Device Role / Timing Role: Compact 5V regulator converting 24V distributed supply to logic-level rails for fieldbus transceivers and ADCs. Use Value: 24V-rated internal switch eliminates external HV MOSFET; thermal shutdown ensures reliability in unventilated enclosures. |
Use Scenario: Powering analog front-ends, isolation amplifiers, and low-power microcontrollers in DIN-rail mounted controllers. IC Role / Device Role / Timing Role: Primary 5V supply for precision analog circuitry, leveraging low dropout and <0.3% load regulation. Use Value: Stable 5.00V ±4% output ensures consistent ADC reference and DAC compliance across temperature and load. |
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 SOT23/TDFN footprint but different pinout (no FB/OUT dual-mode) | Requires external feedback resistors for 5V; lacks preset mode; better suited for higher-current loads where layout allows rework | Select MAX1776ETA+T only if >250mA load current is required and FB pin flexibility is not needed. |
| TPS62231DRYT | 3MHz fixed-frequency PWM, 300mA output, 2.05–6.0V input, 5V preset, 17μA IQ, 0.5mm-pitch 6-WSON | Higher switching frequency enables smaller inductors but introduces fixed EMI peaks; lower input voltage ceiling limits use in 9V+ systems | Choose TPS62231DRYT for ultra-compact 3–5V systems where 24V input capability is unnecessary and EMI filtering is prioritized. |
Compared with MAX1776ETA+T and TPS62231DRYT, the MAX1837ETT50+T uniquely combines 24V input support, factory-preset 5V output, 100% duty cycle, and sub-15μA quiescent current in a thermally enhanced TDFN package-making it optimal for long-life, wide-input, space-constrained industrial and portable designs.
Availability
MAX1837ETT50+T is available at Aetrix Electronics and suitable for 9V battery systems, notebook computers, and industrial control supplies requiring stable component supply, RoHS-compliant packaging, and guaranteed long-term availability through Maxim's product longevity program.
Supply support for MAX1837ETT50+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 computing applications.
The MAX1836/MAX1837 product line was designed for low-power, wide-input DC-DC conversion in battery-powered and distributed power systems-emphasizing ultra-low quiescent current, minimal dropout, and compact packaging.
FAQ
What is the preset output voltage of the MAX1837ETT50+T?
The MAX1837ETT50+T is factory-trimmed for a precise 5.00V ±4% (4.80–5.20V) output in preset mode, achieved by grounding the FB pin and connecting the OUT pin to the regulated output. This eliminates external feedback resistors and ensures stable 5V rail generation across temperature and load variations.
Can the MAX1837ETT50+T operate from a 5V input while delivering 5V output?
Yes-the MAX1837ETT50+T supports 100% duty-cycle operation, allowing it to maintain regulation with VIN as low as VOUT + 120mV. At 100mA load, it sustains 5V output with VIN = 5.12V, making it viable for near-dropout scenarios such as aging 5V wall adapters or low-voltage battery stages.
What is the function of the OUT pin on the MAX1837ETT50+T?
The OUT pin on the MAX1837ETT50+T is a high-impedance sense input internally connected to the feedback divider. In preset mode, it must be connected to the regulated output node; in adjustable mode, it is tied to GND to disable the internal divider and enable external resistor-based voltage setting between 1.25V and VIN.
How does the MAX1837ETT50+T achieve 12μA quiescent current?
The MAX1837ETT50+T achieves 12μA quiescent current via its current-limited, variable-frequency control architecture: under light loads, switching pulses are reduced in frequency and duration, minimizing gate drive and bias currents. This behavior is intrinsic to the control scheme-not dependent on external components or configuration.
Is the exposed pad (EP) on the MAX1837ETT50+T electrically connected?
Yes-the exposed pad (EP) on the MAX1837ETT50+T is internally connected to GND and must be soldered to a PCB ground plane. It serves dual purposes: lowering thermal resistance (enabling 1951mW power dissipation at +70°C) and reducing ground impedance for improved noise immunity and stability in high-frequency switching operation.
MAX1837ETT50+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 6-WDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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):
- 5V
- 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:
- 6-TDFN (3x3)
MAX1837ETT50+T FAQ
1.How can I place an order for MAX1837ETT50+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1837ETT50+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 MAX1837ETT50+T reliable?
The price and inventory of MAX1837ETT50+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1837ETT50+T is usually 5 days.
3.What payment methods are accepted for MAX1837ETT50+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1837ETT50+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1837ETT50+T?
MAX1837ETT50+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1837ETT50+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 MAX1837ETT50+T?
For technical support, including MAX1837ETT50+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1837ETT50+T requirements.
6.How does Aetrix verify that MAX1837ETT50+T is sourced from the original manufacturer or authorized distributors?
All MAX1837ETT50+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 MAX1837ETT50+T meets industry standards.
7.What is the process for return or replacement of MAX1837ETT50+T?
All MAX1837ETT50+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX1837ETT50+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 MAX1837ETT50+T part is unused and in its original packaging.
Return procedure for MAX1837ETT50+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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