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Analog Devices Inc./Maxim Integrated MAX1837ETT33+T
- Part No.:
- MAX1837ETT33+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 6-WDFN Exposed Pad
- Datasheet:
-
MAX1837ETT33+T.pdf
- Description:
- IC REG BUCK 3.3V 250MA 6TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,498
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Product details
Overview
The MAX1837ETT33+T from Maxim Integrated is a high-efficiency, 3.3V fixed-output step-down DC-DC converter with internal 24V p-channel MOSFET, delivering up to 250mA load current, 12μA quiescent current, and 100% duty-cycle operation for ultra-low dropout (120mV at 100mA). It targets space-constrained, battery-powered systems such as handheld devices and industrial control supplies.
For engineers reviewing the MAX1837ETT33+T datasheet, MAX1837ETT33+T pinout, MAX1837ETT33+T application, or MAX1837ETT33+T equivalent, key selection criteria include input voltage range (4.5V–24V), preset 3.3V output tolerance (±4%), thermal shutdown (160°C), and TDFN-EP package compatibility with low-ESR capacitor requirements.
Technical Context
The MAX1837ETT33+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 regulation down to VIN − VDROPOUT, where dropout is determined by RDS(ON) (2Ω typ) and inductor DCR.
This device integrates dual-mode feedback (preset or adjustable), internal current sensing, and zero-crossing detection to ensure stable discontinuous-conduction-mode (DCM) operation. The LX node supports external inductor and Schottky diode placement, with minimum off-time (0.2–0.6μs) and maximum on-time (7–13μs) tightly controlled to manage peak inductor current and ripple.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 24V - supports wide-input battery and industrial rails without pre-regulation |
| Output Voltage | 3.3V ±4% (3.168V–3.432V) - factory-trimmed fixed output, no external resistors required |
| Max Output Current | 250mA - sustained delivery under full load with thermal protection active |
| Quiescent Current | 12μA - enables multi-year battery life in always-on sensor nodes |
| Dropout Voltage | 120mV at 100mA - allows operation down to VIN = 3.42V while maintaining 3.3V regulation |
| Switching Frequency | Variable (≈1–2MHz typical) - self-adjusting to load; enables use of small 22–47μH inductors |
| Shutdown Current | 3μA - reduces system standby power to negligible levels |
Pinout & Package
MAX1837ETT33+T is housed in a 6-pin 3mm × 3mm TDFN-EP package with exposed pad (EP) for thermal and ground integrity. The EP must be soldered to a PCB ground plane for proper thermal dissipation and noise immunity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 FB | Dual-mode feedback input | Connect to GND for 3.3V preset mode; connect to resistor divider for adjustable output (1.25V–VIN) |
| 2 GND | Power and signal ground reference | Primary return path for internal circuitry and high-current LX switching loop |
| 3 IN | Main input supply connection | Accepts 4.5V–24V; connects to source of internal 24V p-channel MOSFET |
| 4 LX | Switch node | Drain of internal MOSFET; drives external inductor; requires low-inductance layout |
| 5 SHDN | Logic-controlled shutdown enable | Low = 3μA shutdown; high = normal operation; must not float; min slew rate 10V/ms |
| 6 OUT | High-impedance output sense | Internally connected to feedback divider; tie to regulated output in preset mode; tie to GND in adjustable mode |
Key Features
| Feature | Design Value |
|---|---|
| 100% Duty-Cycle Operation | Enables regulation at VIN as low as VOUT + 120mV, maximizing usable battery voltage range |
| 12μA Quiescent Current | Reduces no-load power loss to <15μW at 3.3V output, critical for long-life battery applications |
| Internal 24V p-Channel MOSFET | Eliminates external high-voltage switch; simplifies BOM and layout while supporting 24V input |
| Thermal Shutdown with 10°C Hysteresis | Protects against sustained overload; auto-recovery prevents latch-up during transient overloads |
| Dual-Mode Feedback (Preset/Adjustable) | Factory-set 3.3V output eliminates calibration; optional resistor divider enables custom voltages |
Applications
| Handheld Devices | Industrial Control Supplies |
|---|---|
|
Use Scenario: Power management in portable test meters and wireless sensors operating from single 9V alkaline or Li-ion cells. IC Role / Device Role / Timing Role: Primary 3.3V rail generator replacing linear regulators to extend battery runtime. Use Value: 90%+ efficiency across 10mA–250mA load range minimizes heat rise in sealed enclosures and extends operational time per battery charge. |
Use Scenario: Local 3.3V supply for PLC I/O modules and field transmitters in 24V distributed control systems. IC Role / Device Role / Timing Role: Point-of-load (POL) buck converter providing isolated logic supply from noisy 24V bus. Use Value: 4.5V–24V input range tolerates brownouts and surges; 100% duty cycle maintains regulation during 24V bus sag to 5V. |
| 9V Battery Systems | Backup Supplies |
|
Use Scenario: Compact 3.3V conversion in smoke detectors and security sensors powered by 9V batteries. IC Role / Device Role / Timing Role: Low-quiescent-current step-down regulator enabling >5-year shelf life with minimal self-discharge. Use Value: 12μA IQ ensures <1% annual battery drain when idle; shutdown mode reduces leakage to 3μA for emergency reserve states. |
Use Scenario: Secondary 3.3V rail in telecom line cards and server management controllers requiring fail-safe backup power. IC Role / Device Role / Timing Role: Standby converter activated only when main supply fails, minimizing primary system loading. Use Value: Fast startup (<1ms) and stable output under load transients ensure uninterrupted microcontroller operation during switchover. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62231DRYR | 3.3V fixed, 300mA, 2.05–6.0V input, 22μA IQ, 2mm × 2mm WSON | Lower input voltage ceiling (6V max); unsuitable for 9V/24V battery or industrial rails | Select when input is limited to ≤6V and board area is critical; not drop-in for MAX1837ETT33+T's 24V capability |
| LM2675M-3.3/NOPB | 3.3V fixed, 1A, 8–40V input, 5.5mA IQ, SO-8 package, external MOSFET | Higher current, wider input, but requires external FET and larger footprint; no 100% duty cycle | Choose for >250mA loads or higher input voltages beyond 24V; expect added BOM cost and layout complexity |
Compared with TPS62231DRYR and LM2675M-3.3/NOPB, the MAX1837ETT33+T uniquely balances 24V input support, 250mA output, ultra-low IQ, and 100% duty cycle in a 3mm × 3mm TDFN-making it optimal for compact, wide-input, battery-sensitive designs where dropout and standby power are critical.
Availability
MAX1837ETT33+T 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 assurance, and RoHS-compliant packaging.
Supply support for MAX1837ETT33+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 markets.
The MAX1836/MAX1837 product line was designed for low-power, wide-input DC-DC conversion in battery-operated and space-constrained equipment-emphasizing efficiency at light loads, minimal dropout, and integrated high-voltage switching.
FAQ
What is the maximum input voltage supported by the MAX1837ETT33+T?
The MAX1837ETT33+T supports an absolute maximum input voltage of 24V, with guaranteed operation from 4.5V to 24V. This wide range enables direct use with 9V batteries, 12V industrial rails, and 24V backup systems without external pre-regulation. Exceeding 24V risks permanent damage per Absolute Maximum Ratings.
Does the MAX1837ETT33+T require external components to deliver its preset 3.3V output?
Yes, the MAX1837ETT33+T requires an external inductor, output capacitor, input capacitor, and Schottky diode to operate - but no external feedback resistors. In preset mode, FB is tied to GND and OUT is connected to the regulated output. Typical values are 22–47μH inductor, 100μF output capacitor, 10μF input capacitor, and 0.5A Schottky diode.
How does the MAX1837ETT33+T achieve 100% duty-cycle operation, and what is its practical benefit?
The MAX1837ETT33+T achieves 100% duty cycle by holding its internal p-channel MOSFET fully on when the input voltage approaches the output voltage. This eliminates switching losses and reduces dropout to just 120mV at 100mA. Practically, it allows the MAX1837ETT33+T to sustain 3.3V output even as a 9V battery discharges below 4V - extending usable battery life significantly.
What thermal protection features does the MAX1837ETT33+T include?
The MAX1837ETT33+T incorporates thermal-overload protection that disables the internal MOSFET when junction temperature exceeds +160°C. After cooling by 10°C, it automatically resumes operation. This hysteresis prevents thermal cycling instability. The TDFN-EP package's exposed pad must be soldered to a ≥1in² copper ground plane to achieve the specified 1951mW power dissipation at +70°C.
Can the MAX1837ETT33+T be used in adjustable-output configurations?
Yes, the MAX1837ETT33+T supports adjustable output from 1.25V to VIN using external resistors on the FB pin. To do so, disconnect FB from GND, tie OUT to GND, and connect a resistor divider from VOUT to FB. The feedback threshold is precisely 1.25V (±4%), and output voltages above 5.5V require SHDN to be permanently tied to IN to disable shutdown functionality.
MAX1837ETT33+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):
- 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:
- 6-TDFN (3x3)
MAX1837ETT33+T FAQ
1.How can I place an order for MAX1837ETT33+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1837ETT33+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 MAX1837ETT33+T reliable?
The price and inventory of MAX1837ETT33+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1837ETT33+T is usually 5 days.
3.What payment methods are accepted for MAX1837ETT33+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1837ETT33+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1837ETT33+T?
MAX1837ETT33+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1837ETT33+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 MAX1837ETT33+T?
For technical support, including MAX1837ETT33+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1837ETT33+T requirements.
6.How does Aetrix verify that MAX1837ETT33+T is sourced from the original manufacturer or authorized distributors?
All MAX1837ETT33+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 MAX1837ETT33+T meets industry standards.
7.What is the process for return or replacement of MAX1837ETT33+T?
All MAX1837ETT33+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX1837ETT33+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 MAX1837ETT33+T part is unused and in its original packaging.
Return procedure for MAX1837ETT33+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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