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Analog Devices Inc./Maxim Integrated MAX1836EUT33#TG16
- Part No.:
- MAX1836EUT33#TG16
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SOT-23-6
- Datasheet:
-
MAX1836EUT33#TG16.pdf
- Description:
- IC REG BUCK 3.3V 125MA SOT6
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
The MAX1836EUT33#TG16 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 like handheld devices and industrial control supplies.
For engineers reviewing the MAX1836EUT33#TG16 datasheet, MAX1836EUT33#TG16 pinout, MAX1836EUT33#TG16 application, or MAX1836EUT33#TG16 equivalent, key selection considerations include its fixed 3.3V output, 125mA load capability, 100% duty cycle dropout performance, SOT23 footprint compatibility, and shutdown-controlled 3μA standby current.
Technical Context
The MAX1836EUT33#TG16 employs a proprietary current-limited control architecture that enables variable-frequency operation up to 100% duty cycle, eliminating unnecessary switching under light loads. This scheme directly achieves 12μA no-load supply current and maintains regulation down to VIN − VOUT = 120mV at 100mA.
Its internal 24V-rated P-channel MOSFET (RDS(ON) = 1.1Ω typ) and integrated current-sense circuitry eliminate external sense resistors. The dual-mode feedback pin (FB) supports both preset 3.3V operation (FB = GND) and adjustable output (1.25V–VIN) via external resistor divider, with 1.25V reference voltage and ±25nA FB bias current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Preset 3.3V ±3.6% (3.168V–3.432V) - tightly regulated for logic supply rails without external feedback components. |
| Input Voltage Range | 4.5V to 24V - supports wide-input industrial and battery systems including 9V, 12V, and 24V nominal sources. |
| Max Output Current | 125mA continuous - sufficient for low-power microcontrollers, sensors, and interface ICs in portable equipment. |
| Dropout Voltage | 120mV at 100mA - enables operation down to VIN = 3.42V while maintaining 3.3V output, extending usable battery life. |
| Quiescent Current | 12μA typical - minimizes standby power loss in always-on or intermittently active applications. |
| Shutdown Current | 3μA maximum - ensures near-zero power draw during system sleep or deep-off states. |
| Switching Frequency | Variable (≈1–2 MHz range depending on load/VIN) - enables use of compact 22–47μH surface-mount inductors and low-ESR ceramic capacitors. |
| Package | 6-pin SOT23 (top mark AANY) - industry-standard footprint with 0.95mm pitch, compatible with automated assembly and reflow. |
Pinout & Package
Package: 6-pin SOT23 (JEDEC MO-178AA), 2.9mm × 1.6mm × 1.1mm body, exposed pad not present (SOT23 variant, unlike TDFN-EP).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - FB | Dual-mode feedback input | Connect to GND for preset 3.3V output; connect to resistive divider for adjustable output (1.25V–VIN); 1.25V internal reference, ±25nA bias current. |
| 2 - GND | Power and signal ground | Primary return path for input, output, and internal circuits; must be connected to low-impedance PCB ground plane. |
| 3 - IN | Main power input | Accepts 4.5V–24V supply; connects to source of internal P-channel MOSFET; requires local 10μF/25V input capacitor. |
| 4 - LX | Switch node | Drain connection of internal P-MOSFET; drives external inductor; requires low-inductance routing and Schottky catch diode (e.g., EP05Q03L). |
| 5 - SHDN | Logic-controlled shutdown enable | Active-low input; <0.8V shuts down IC (3μA ISHDN), >2.4V enables operation; must not float - tie to IN if unused. |
| 6 - OUT | Output voltage sense | Internally connected to feedback divider; connect to regulated output for preset mode; connect to GND for adjustable mode. |
Key Features
| Feature | Design Value |
|---|---|
| 100% duty cycle operation | Enables true dropout-free regulation down to VIN = VOUT + 120mV, maximizing battery utilization in 3.3V systems powered from single Li-ion or 9V batteries. |
| 12μA quiescent current | Reduces no-load power dissipation to <15μW at 3.3V output - critical for multi-year battery life in remote sensors and IoT endpoints. |
| Internal 24V P-channel MOSFET | Eliminates external high-voltage switch; RDS(ON) = 1.1Ω typ ensures low conduction loss and simplifies BOM for cost-sensitive designs. |
| Dual-mode feedback (FB) | Supports both factory-preset 3.3V (no external resistors) and precision-adjustable output (1.25V reference, 0.5% tolerance) without changing IC or layout. |
| Thermal shutdown with 10°C hysteresis | Protects against sustained overload or poor heatsinking by cycling ON/OFF at ~160°C junction temperature - prevents permanent damage during transient faults. |
| 3μA shutdown current | Allows full system-level power gating; enables microamp-level system sleep states when paired with MCU-controlled SHDN assertion. |
Applications
| Handheld Medical Devices | Industrial Sensor Transmitters |
|---|---|
Use Scenario: Portable blood glucose meters and pulse oximeters powered by single 3.7V Li-ion cells requiring stable 3.3V for MCU and analog front-end. IC Role / Device Role / Timing Role: Primary 3.3V step-down regulator supplying core logic and precision ADC reference. Use Value: 100% duty cycle extends usable battery range down to 3.42V, while 12μA quiescent current enables >5-year shelf life in sealed units. |
Use Scenario: 4–20mA loop-powered temperature/pressure transmitters operating from 12–24V loop supply with isolated 3.3V digital section. IC Role / Device Role / Timing Role: Local 3.3V regulator for low-power microcontroller and signal conditioning circuitry. Use Value: 24V input rating and 125mA output support full-spectrum loop compliance; thermal shutdown protects against field wiring faults. |
| Backup Power Supplies | Low-Power Notebook Peripherals |
Use Scenario: SRAM/clock backup circuits in industrial PLCs using supercapacitors charged from 5V rail, requiring regulated 3.3V during main power loss. IC Role / Device Role / Timing Role: Standby regulator activated only during brownout/failover events. Use Value: 3μA shutdown current preserves supercapacitor energy for >72 hours; 120mV dropout ensures regulation until capacitor decays to 3.42V. |
Use Scenario: USB-powered docking accessories (e.g., HDMI adapters, card readers) drawing burst current from 5V bus while needing clean 3.3V for interface ICs. IC Role / Device Role / Timing Role: Efficient local DC-DC conversion replacing linear regulators to reduce heat and improve efficiency. Use Value: >90% peak efficiency at 100mA reduces thermal load in compact enclosures; SOT23 footprint fits tight USB-C form factors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX1837EUT33-T | Same pinout and function, but rated for 250mA output (vs. 125mA); higher ILIM (500mA typ) and lower RDS(ON) (1.1Ω vs. 2Ω). | Required where peak loads exceed 125mA or where lower dropout at higher currents is needed. | Select MAX1837EUT33-T only if design requires >125mA continuous output; otherwise MAX1836EUT33#TG16 offers optimal cost/performance for ≤125mA loads. |
| TPS62231DRYT | 3MHz fixed-frequency buck with 300mA output, 2.05–6.0V input, 17μA IQ; different pinout (5-pin WSON), no 100% duty cycle. | Lacks ultra-low dropout capability; unsuitable for sub-3.5V input scenarios where MAX1836EUT33#TG16 excels. | Choose TPS62231DRYT for higher-frequency, noise-sensitive applications with ample input headroom; avoid when VIN may dip near 3.3V. |
Compared with MAX1837EUT33-T, the MAX1836EUT33#TG16 trades output current headroom for lower cost and identical footprint; versus TPS62231DRYT, it delivers superior dropout performance and lower quiescent current but lacks fixed-frequency EMI control - making it preferable for battery-critical, space-constrained, low-VIN applications.
Availability
MAX1836EUT33#TG16 is available at Aetrix Electronics and suitable for handheld medical devices, industrial sensor transmitters, backup power supplies, and low-power notebook peripherals requiring stable component supply with guaranteed long-term sourcing.
Supply support for MAX1836EUT33#TG16 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 ultra-low-power, wide-input-voltage step-down regulation in battery-powered and distributed power systems - emphasizing minimal dropout, nanoscale quiescent current, and compact integration.
FAQ
What is the preset output voltage of the MAX1836EUT33#TG16?
The MAX1836EUT33#TG16 is factory-set to deliver a precise 3.3V output in preset mode (FB pin connected to GND). Its output voltage tolerance is ±3.6%, specified as 3.168V to 3.432V across temperature and load (0–125mA). This fixed output eliminates external feedback resistors, simplifying design for standard 3.3V logic rails.
Can the MAX1836EUT33#TG16 operate with input voltages below 4.5V?
No - the MAX1836EUT33#TG16 has a hard input undervoltage lockout (UVLO) threshold of 3.45V (falling) to 4.4V (rising). Operation below 4.5V violates the Absolute Maximum Ratings and will cause the device to disable. For sub-4.5V inputs, consider alternative regulators such as the MAX1724 or TPS61200 series.
What is the maximum allowable dropout voltage for the MAX1836EUT33#TG16 at 100mA load?
The MAX1836EUT33#TG16 exhibits a measured dropout voltage of 120mV at 100mA load, defined as the minimum VIN − VOUT differential required to maintain regulation. This value is derived from the internal P-MOSFET's RDS(ON) (2Ω typ) and inductor DCR, and is confirmed in the Electrical Characteristics table under "Dropout Voltage" parameter.
Does the MAX1836EUT33#TG16 require an external catch diode?
Yes - the MAX1836EUT33#TG16 requires an external Schottky diode (e.g., Nihon EP05Q03L) connected between LX and GND. The internal switch is a P-channel MOSFET; during off-time, the diode provides the return path for inductor current. Omitting this diode will cause catastrophic failure due to unclamped inductive kickback.
How does the shutdown function behave on the MAX1836EUT33#TG16?
When SHDN is pulled low (<0.8V), the MAX1836EUT33#TG16 enters shutdown mode, reducing total supply current to ≤3μA and placing LX in high-impedance state. The output voltage decays only through load and output capacitance. SHDN must never be left floating - tie to IN if unused, per datasheet guidance.
MAX1836EUT33#TG16 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:
- 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#TG16 FAQ
1.How can I place an order for MAX1836EUT33#TG16 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1836EUT33#TG16 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#TG16 reliable?
The price and inventory of MAX1836EUT33#TG16 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1836EUT33#TG16 is usually 5 days.
3.What payment methods are accepted for MAX1836EUT33#TG16?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1836EUT33#TG16 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1836EUT33#TG16?
MAX1836EUT33#TG16 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1836EUT33#TG16 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#TG16?
For technical support, including MAX1836EUT33#TG16 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1836EUT33#TG16 requirements.
6.How does Aetrix verify that MAX1836EUT33#TG16 is sourced from the original manufacturer or authorized distributors?
All MAX1836EUT33#TG16 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#TG16 meets industry standards.
7.What is the process for return or replacement of MAX1836EUT33#TG16?
All MAX1836EUT33#TG16 units undergo pre-shipment inspection (PSI). If there is an issue with MAX1836EUT33#TG16, 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#TG16 part is unused and in its original packaging.
Return procedure for MAX1836EUT33#TG16:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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