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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 BUCK 3.3V 125MA SOT6
- Quantity:
- Payment:
- Shipping:
Inventory:2,237
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Product details
Overview
The MAX1836EUT33+T from Maxim Integrated is a high-efficiency, preset 3.3V step-down DC-DC converter with internal 24V p-channel MOSFET, supporting 4.5V–24V input and delivering up to 125mA output current. It features 100% duty-cycle operation for ultra-low dropout (120mV at 100mA), 12μA quiescent current, and operates in 6-pin SOT23 package - ideal 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, real-world design meaning of key specs, validated pin functions, confirmed alternative options, and supply-chain support details specific to this exact SOT23-packaged 3.3V variant.
Technical Context
The MAX1836EUT33+T implements a proprietary current-limited control architecture that enables variable-frequency operation and 100% duty cycle - eliminating conventional PWM switching losses under light loads and minimizing dropout voltage during low-input conditions. Its internal 24V-rated p-channel MOSFET (RDS(ON) = 1.1Ω typ) and integrated current-sense circuitry eliminate external sensing components.
This device operates in dual-mode feedback: FB grounded for factory-preset 3.3V output (±3.6% tolerance), or configured via external resistor divider for adjustable outputs from 1.25V to VIN. Shutdown input (SHDN) reduces supply current to 3μA, and thermal shutdown activates at +160°C with 10°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 24V - supports wide-range industrial and battery inputs including 9V, 12V, and 24V rails without external regulators. |
| Output Voltage | Preset 3.3V ±3.6% (3.168V–3.432V) - tightly regulated for powering 3.3V logic, microcontrollers, and sensors without external feedback resistors. |
| Max Output Current | 125mA - sufficient for low-power MCU cores, RF modules, and analog front-ends in portable equipment. |
| Dropout Voltage | 120mV at 100mA - enables usable operation down to ~3.42V input when regulating 3.3V, extending battery runtime in single-cell Li-ion or multi-cell alkaline systems. |
| Quiescent Current | 12μA - minimizes standby power loss in always-on monitoring circuits and IoT edge nodes. |
| Shutdown Current | 3μA - ensures near-zero power draw during deep sleep, critical for battery life in handheld and remote sensor applications. |
| Switching Frequency | Variable (typ. 500kHz–1.2MHz) - scales with load to maintain high efficiency (>90%) across 0.1mA–125mA range without fixed-frequency EMI peaks. |
Pinout & Package
MAX1836EUT33+T 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. The package measures 2.9mm × 1.6mm × 1.1mm and is optimized for reflow soldering on compact PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - FB | Dual-mode feedback input | Grounded to select preset 3.3V output; connected to resistor divider for adjustable outputs (1.25V–VIN). Threshold is 1.25V ±4%. |
| 2 - GND | Power and signal ground reference | Common return path for input capacitor, output capacitor, and exposed pad; must be star-connected to minimize noise coupling into FB. |
| 3 - IN | Main power input | Accepts 4.5V–24V; connects to source of internal p-channel MOSFET. Requires local 10µF/25V ceramic or low-ESR input capacitor. |
| 4 - LX | Switch node | Drain of internal p-channel MOSFET; drives external inductor (47µH typical). Must be routed short and wide to reduce EMI and switching losses. |
| 5 - SHDN | Logic-controlled enable/disable | Active-low input: <0.8V = shutdown (3μA IQ); >2.4V = active. Must not float - tie to IN if unused. |
| 6 - OUT | Output sense / mode selection | Internally connected to feedback divider; connect to regulated output for preset mode, or to GND for adjustable mode with external divider. |
Key Features
| Feature | Design Value |
|---|---|
| 100% duty-cycle operation | Enables regulation down to VIN = VOUT + 120mV, maximizing usable battery voltage range in 3.3V systems powered from single Li-ion or 3×AA cells. |
| Internal 24V p-channel MOSFET | Eliminates need for external high-voltage switch; RDS(ON) = 1.1Ω typ ensures low conduction loss at 125mA, reducing thermal stress in SOT23 package. |
| Dual-mode feedback (FB/OUT) | Supports both plug-and-play 3.3V operation (FB=GND, OUT=VOUT) and flexible adjustable outputs (FB=divider, OUT=GND) without redesigning the PCB layout. |
| 12μA no-load supply current | Reduces idle power in always-on applications like smoke detectors or environmental sensors - extends shelf life and field deployment intervals. |
| Thermal shutdown with hysteresis | Protects against sustained overload or poor heatsinking: shuts down at +160°C and resumes only after cooling to +150°C, preventing latch-up or damage. |
Applications
| Handheld Medical Devices | Industrial Sensor Nodes |
|---|---|
Use Scenario: Portable blood glucose meters and pulse oximeters powered by two AAA batteries (2.4V–3.2V fresh, dropping to ~1.8V per cell). IC Role / Device Role / Timing Role: Primary 3.3V supply for low-power MCU, OLED display driver, and analog front-end ADC. Use Value: 100% duty cycle maintains regulation until battery reaches ~3.42V, extending operational time by >15% versus conventional buck converters with fixed minimum dropout. |
Use Scenario: Wireless temperature/humidity sensors deployed in factory environments with 24V DC distribution rails. IC Role / Device Role / Timing Role: Local point-of-load regulator converting 24V to clean, stable 3.3V for MCU, LoRaWAN transceiver, and precision sensor ICs. Use Value: 4.5V–24V input range eliminates need for pre-regulator; 12μA quiescent current ensures >10-year battery life in energy-harvesting configurations. |
| Backup Power Supplies | 4–20mA Loop-Powered Transmitters |
Use Scenario: Fail-safe backup for PLC I/O modules using supercapacitors charged from main 24V rail. IC Role / Device Role / Timing Role: Standby 3.3V regulator activated when main supply fails; powers watchdog timer and SRAM retention circuitry. Use Value: 3μA shutdown current preserves supercapacitor charge for >72 hours; fast startup (<100µs) ensures uninterrupted memory retention during brownout events. |
Use Scenario: Two-wire field transmitters drawing loop current while powering internal 3.3V circuitry from limited 3.5–4.2V compliance voltage. IC Role / Device Role / Timing Role: Ultra-low-dropout step-down regulator enabling full 3.3V functionality even at 4.2V loop compliance. Use Value: 120mV dropout allows reliable 3.3V output with only 0.9V headroom - maximizes usable loop voltage for signal processing and diagnostics. |
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 compensation and lacks preset 3.3V option. | Suitable for higher-current loads (e.g., motor drivers, multi-sensor hubs); not drop-in due to different feedback architecture and pinout. | Select MAX1776ETA+T only when >125mA is required and board layout accommodates its larger TDFN footprint and compensation network. |
| TPS62231DRVR | 3-MHz fixed-frequency PWM, 300mA output, 2.05V–6.5V input, 3.3V preset, 17μA IQ, 6-pin WSON package. | Better suited for noise-sensitive RF sections due to constant frequency; lower input voltage ceiling limits use in 9V/12V/24V systems. | Choose TPS62231DRVR where EMI filtering is critical and input stays below 6.5V; avoid for wide-input industrial or battery applications requiring >6.5V. |
Compared with MAX1776ETA+T and TPS62231DRVR, the MAX1836EUT33+T uniquely balances ultra-wide input range (4.5V–24V), true 100% duty cycle for minimal dropout, and plug-and-play 3.3V operation in the smallest SOT23 footprint - making it optimal for cost- and space-constrained battery-backed or distributed power systems.
Availability
MAX1836EUT33+T is available at Aetrix Electronics and suitable for handheld medical devices, industrial sensor nodes, backup power supplies, and 4–20mA loop-powered transmitters requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, automotive, communications, and computing markets.
The MAX1836/MAX1837 product line was designed specifically for low-power, wide-input-voltage DC-DC conversion in battery-operated and industrial equipment - emphasizing efficiency at light loads, minimal dropout, and integration of high-voltage switches in miniature packages.
FAQ
What is the maximum output current capability of the MAX1836EUT33+T?
The MAX1836EUT33+T delivers up to 125mA continuous output current under typical operating conditions (TA = +25°C, VIN = 12V). This rating is limited by internal current limiting (ILIM = 250–450mA) and thermal dissipation in the 6-pin SOT23 package. Derating is required above +70°C ambient (8.7mW/°C), and actual achievable current depends on PCB copper area, input voltage, and ambient temperature.
Does the MAX1836EUT33+T require external feedback resistors to output 3.3V?
No - the MAX1836EUT33+T is factory-configured for preset 3.3V output. To use this mode, connect FB to GND and OUT 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 connected between VOUT and FB.
What is the dropout voltage specification for the MAX1836EUT33+T, and how is it measured?
The dropout voltage of the MAX1836EUT33+T is specified as 120mV at 100mA load current, measured when the input voltage drops just enough to cause the output to fall out of regulation. This value results from the sum of the internal p-channel MOSFET's RDS(ON) (1.1Ω typ) and inductor series resistance, and scales linearly with load current - enabling reliable operation down to VIN ≈ 3.42V for 3.3V output.
Can the MAX1836EUT33+T be used in shutdown mode to reduce system power consumption?
Yes - asserting SHDN low disables the internal MOSFET and reduces total supply current to 3μA (max), ideal for battery-powered systems needing deep sleep. The LX node becomes high-impedance, isolating input from output. SHDN must not be left floating; if unused, tie it to IN. Note that shutdown is disabled when output is set above 5.5V, requiring SHDN to be permanently connected to IN in those cases.
Is thermal shutdown protection included in the MAX1836EUT33+T, and how does it behave?
Yes - the MAX1836EUT33+T includes thermal shutdown protection that activates at +160°C junction temperature (with 10°C hysteresis). When triggered, the internal p-channel MOSFET turns off to halt power dissipation. Once the die cools to +150°C, regulation resumes automatically. This behavior prevents permanent damage during sustained overload or inadequate PCB heatsinking, especially critical in sealed enclosures or high-ambient environments.
MAX1836EUT33+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-6
- 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:
- 125mA
- Frequency - Switching:
- -
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-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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