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Analog Devices Inc./Maxim Integrated MAX1836EUT33-T
- Part No.:
- MAX1836EUT33-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SOT-23-6
- Datasheet:
-
MAX1836EUT33-T.pdf
- Description:
- IC REG BCK ADJ/1.25V 125MA SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:1,451
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Product details
Overview
The MAX1836EUT33-T 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, 125mA load capability, and 12μA quiescent current-designed for space-constrained battery-powered systems such as handheld devices and industrial control supplies.
For engineers reviewing the MAX1836EUT33-T datasheet, MAX1836EUT33-T pinout, MAX1836EUT33-T application, or MAX1836EUT33-T equivalent, this page delivers verified technical context, exact pin functions, real-world application mappings, and validated alternative options for low-power 3.3V regulation in 9V battery and distributed power systems.
Technical Context
The MAX1836EUT33-T implements a proprietary current-limited control architecture enabling up to 100% duty cycle operation-critical for minimizing dropout voltage (120mV at 100mA) and extending usable battery life. Its internal 24V-rated P-channel MOSFET eliminates external switch requirements.
This device operates in discontinuous conduction mode with variable switching frequency, reducing light-load supply current to 12μA and shutdown current to 3μA. Feedback is dual-mode: grounded FB enables preset 3.3V output, while external resistor divider supports adjustable outputs from 1.25V to VIN.
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. |
| Output Voltage | 3.3V ±3.6% (3.168V–3.432V) - factory-preset, stable under 0–125mA load with ≤0.3% load regulation. |
| Max Output Current | 125mA - limited by internal current-sense threshold (250–450mA typical LX limit) and thermal design in SOT23 package. |
| Quiescent Current | 12μA - enables multi-year battery life in always-on sensor nodes and backup supplies. |
| Dropout Voltage | 120mV at 100mA - achieved via 100% duty cycle and low RDS(ON) (~2Ω), allowing operation down to VIN = 3.42V. |
| Switching Frequency | Variable (≈1–2MHz typical) - scales with load; enables use of compact 22–47μH surface-mount inductors. |
| Shutdown Current | 3μA - ensures negligible drain during system sleep modes without external circuitry. |
Pinout & Package
MAX1836EUT33-T is housed in a 6-pin SOT23 package (JEDEC MO-178AA), with exposed pad not present-unlike TDFN variants. The package supports reflow soldering and fits standard 0805-footprint layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - FB | Dual-mode feedback input | Grounded for 3.3V preset; connects to resistive divider for adjustable output (1.25V–VIN); threshold = 1.25V ±4%. |
| 2 - GND | Power and signal ground reference | Common return for internal circuits, LX freewheel path, and external components; must be star-connected for stability. |
| 3 - IN | Main input supply connection | Accepts 4.5V–24V; powers internal bias and drives source of internal P-MOSFET; UVLO triggers at 3.55–4.4V. |
| 4 - LX | Switch node | Drain of internal P-MOSFET; connects to inductor; switches between IN and GND; requires low-ESR ceramic bypass near pin. |
| 5 - SHDN | Logic-controlled enable/disable | Active-low; <0.8V disables IC (3μA ISHDN); >2.4V enables; slew rate ≥10V/ms required; must not float. |
| 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 ultra-low dropout (120mV @100mA), extending usable battery voltage range down to ~3.4V for 3.3V output. |
| Current-limited control architecture | Eliminates fixed-frequency PWM losses; reduces light-load IIN to 12μA and enables variable-frequency optimization. |
| Dual-mode feedback (FB) | Supports both factory-preset 3.3V (FB=GND) and adjustable output (1.25V–VIN) without external op-amps or references. |
| Internal 24V P-channel MOSFET | Removes need for external high-voltage switch; simplifies BOM and layout while maintaining 125mA output capability. |
| Thermal-overload protection | Auto-cycles at +160°C junction temperature with 10°C hysteresis-prevents damage during sustained overload or poor heatsinking. |
Applications
| Handheld Devices | 9V Battery Systems |
|---|---|
|
Use Scenario: Power management in portable test meters, barcode scanners, and medical handhelds operating from single 9V alkaline cells. IC Role / Device Role / Timing Role: Primary 3.3V regulator delivering stable rail to microcontroller, display, and sensors across battery discharge curve (9V → 4.5V). Use Value: 100% duty cycle maintains regulation down to 3.42V input, extracting ~15% more usable battery energy versus conventional buck converters. |
Use Scenario: Compact, low-cost power conversion in legacy 9V-powered instrumentation and remote sensors. IC Role / Device Role / Timing Role: Replaces linear regulators (e.g., LM78L33) with >90% efficiency at 50mA, eliminating heat sink requirements. Use Value: 12μA quiescent current extends shelf life and standby time; SOT23 footprint saves >50% PCB area vs. TO-92 linear solutions. |
| Industrial Control Supplies | Backup Supplies |
|
Use Scenario: Local 3.3V rail generation in PLC I/O modules and field transmitters powered from 12–24V DC bus. IC Role / Device Role / Timing Role: Point-of-load regulator for isolated microcontrollers and analog front-ends, rejecting bus noise via high PSRR at light loads. Use Value: Input range up to 24V accommodates brownout margins; thermal shutdown protects against enclosure overheating. |
Use Scenario: Always-on auxiliary supply for SRAM retention, RTC, or watchdog circuits during main power failure. IC Role / Device Role / Timing Role: Low-quiescent regulator powered from supercapacitor or backup battery; maintains 3.3V during extended outages. Use Value: 3μA shutdown current enables >1-year hold-up from 0.1F/5.5V supercap; no external enable logic required. |
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 output current (500mA), same 6-pin TDFN package, but requires external diode and lacks 100% duty cycle. | Better suited for higher-load applications; less effective in ultra-low-dropout scenarios due to diode forward drop. | Select when >125mA load or smaller TDFN footprint is prioritized over minimal dropout voltage. |
| TPS62231DRYT | 3-MHz fixed-frequency PWM, 200mA output, 2.05–6.0V input, 17μA quiescent current-no 100% duty cycle. | Superior light-load efficiency via DCS-Control™, but dropout voltage >300mV limits low-VIN usability. | Prefer for noise-sensitive systems requiring predictable EMI profile and tighter output ripple control. |
Compared with MAX1776ETA+T and TPS62231DRYT, the MAX1836EUT33-T uniquely delivers 100% duty cycle and 12μA quiescent current in a cost-optimized SOT23 package-making it optimal for long-life, low-VIN, space-constrained 3.3V regulation where dropout and standby power dominate selection criteria.
Availability
MAX1836EUT33-T is available at Aetrix Electronics and suitable for handheld devices, 9V battery systems, and industrial control supplies requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for MAX1836EUT33-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) designs precision analog, mixed-signal, and power-management ICs for industrial, automotive, and computing applications-with emphasis on integration, reliability, and low-power innovation.
The MAX1836/MAX1837 product line targets ultra-low-power, high-input-voltage DC-DC conversion in battery- and bus-powered systems-prioritizing dropout performance, quiescent current, and minimal external component count.
FAQ
What is the maximum input voltage supported by the MAX1836EUT33-T?
The MAX1836EUT33-T supports an absolute maximum input voltage of 24V, with guaranteed operation from 4.5V to 24V. Input undervoltage lockout activates below 3.55V (rising) to prevent erratic startup. Exceeding 24V risks permanent damage per Absolute Maximum Ratings.
Can the MAX1836EUT33-T be used to generate an adjustable output voltage?
Yes-the MAX1836EUT33-T supports adjustable output from 1.25V to VIN using an external resistor divider on the FB pin. In this mode, the OUT pin must be tied to GND. Note that output voltages above 5.5V disable the SHDN function, requiring SHDN to be permanently connected to IN.
What is the dropout voltage specification for the MAX1836EUT33-T at full load?
The MAX1836EUT33-T exhibits a dropout voltage of 120mV at 100mA load current, measured as the minimum VIN–VOUT differential before regulation loss. This value results from the internal P-MOSFET's on-resistance (~2Ω) and inductor DCR, and is enabled by 100% duty cycle operation.
Does the MAX1836EUT33-T require an external diode, and what type is recommended?
Yes-the MAX1836EUT33-T requires an external Schottky diode (e.g., Nihon EP05Q03L) connected from LX to GND. A fast-switching, low-VF Schottky with ≥0.5A RMS rating and reverse voltage >VIN is mandatory; silicon rectifiers may be substituted only in high-temperature environments where leakage is critical.
How does the MAX1836EUT33-T achieve its 12μA quiescent current?
The MAX1836EUT33-T achieves 12μA quiescent current through its current-limited, variable-frequency control architecture-which pulses only as needed to maintain regulation-and optimized BiCMOS process design. This eliminates continuous oscillator and gate-drive overhead found in fixed-frequency PWM controllers.
MAX1836EUT33-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Bulk
- 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 (3.3V)
- Voltage - Output (Max):
- 24V
- Current - Output:
- 125mA
- Frequency - Switching:
- -
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-6
MAX1836EUT33-T FAQ
1.How can I place an order for MAX1836EUT33-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1836EUT33-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 MAX1836EUT33-T reliable?
The price and inventory of MAX1836EUT33-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1836EUT33-T is usually 5 days.
3.What payment methods are accepted for MAX1836EUT33-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1836EUT33-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1836EUT33-T?
MAX1836EUT33-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1836EUT33-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 MAX1836EUT33-T?
For technical support, including MAX1836EUT33-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1836EUT33-T requirements.
6.How does Aetrix verify that MAX1836EUT33-T is sourced from the original manufacturer or authorized distributors?
All MAX1836EUT33-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 MAX1836EUT33-T meets industry standards.
7.What is the process for return or replacement of MAX1836EUT33-T?
All MAX1836EUT33-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX1836EUT33-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 MAX1836EUT33-T part is unused and in its original packaging.
Return procedure for MAX1836EUT33-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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