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Analog Devices Inc./Maxim Integrated MAX1836EUT33#G16
- Part No.:
- MAX1836EUT33#G16
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SOT-23-6
- Datasheet:
-
MAX1836EUT33#G16.pdf
- Description:
- IC REG BUCK ADJ/1.25V 125MA SOT6
- Quantity:
- Payment:
- Shipping:
Inventory:4,066
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Product details
Overview
The MAX1836EUT33#G16 from Maxim Integrated is a high-efficiency, preset 3.3V step-down DC-DC converter with internal 24V p-channel MOSFET, 4.5V–24V input range, 125mA output current capability, and 100% duty-cycle operation enabling 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 MAX1836EUT33#G16 datasheet, MAX1836EUT33#G16 pinout, MAX1836EUT33#G16 application, or MAX1836EUT33#G16 equivalent, key selection criteria include its 12μA quiescent current, SOT23-6 package footprint, dual-mode feedback (preset/adjustable), and thermal shutdown protection at 160°C.
Technical Context
The MAX1836EUT33#G16 employs a proprietary current-limited control architecture operating with variable frequency and up to 100% duty cycle-enabling regulation down to VIN − VDROPOUT without pulse-skipping artifacts. Its internal 24V-rated p-channel MOSFET features 1.1Ω typical on-resistance and integrates current sensing for cycle-by-cycle peak-current limiting.
This device operates in discontinuous conduction mode (DCM) across its load range, with minimum off-time of 0.2µs and maximum on-time of 10µs. Feedback uses a 1.25V reference with ±50mV Dual Mode™ threshold, supporting both preset (FB = GND) and adjustable (external divider) configurations while maintaining 0.3% load regulation and 0.05% line regulation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 24V - supports wide-input industrial and multi-cell battery systems without external pre-regulation. |
| Output Voltage | Preset 3.3V ±3.6% (3.168V–3.432V) - factory-trimmed for stable rail generation without external resistors. |
| Max Output Current | 125mA - sufficient for low-power microcontrollers, sensors, and interface ICs in portable equipment. |
| Quiescent Current | 12μA - extends battery life in always-on monitoring or sleep-mode applications. |
| Dropout Voltage | 120mV at 100mA - enables usable operation down to ~3.42V input when powering 3.3V loads from aging batteries. |
| Switching On-Resistance | 1.1Ω typ (VIN = 6V) - directly determines conduction loss and thermal rise under load. |
| Shutdown Current | 3μA - ensures minimal leakage during system standby or deep-sleep states. |
Pinout & Package
MAX1836EUT33#G16 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. Pin 1 is marked by a dot or notch orientation.
| 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 reference threshold with ±50mV hysteresis. |
| 2 GND | Power and Signal Ground | Primary return path for input/output currents and internal bias; must be tied to EP for optimal thermal performance. |
| 3 IN | Input Supply Connection | Accepts 4.5V–24V; powers internal circuitry and source terminal of internal p-channel MOSFET. |
| 4 LX | Switch Node | Drain of internal p-channel MOSFET; connects to inductor; switches between IN and GND; requires low-inductance layout. |
| 5 SHDN | Active-Low Shutdown Control | Logic-low (<0.8V) disables switching and reduces supply current to 3μA; must not float; tie to IN if unused. |
| 6 OUT | Output Sense Input | Internally connected to feedback divider; connect to regulated output in preset mode; connect to GND in adjustable mode. |
Key Features
| Feature | Design Value |
|---|---|
| 100% Duty-Cycle Operation | Enables lowest possible dropout voltage, extending usable battery voltage range without requiring external LDO post-regulation. |
| 12μA Quiescent Current | Minimizes no-load power draw in battery-backed systems, enabling multi-year operation in low-duty-cycle sensor nodes. |
| Integrated 24V p-Channel MOSFET | Eliminates need for external high-voltage switch and gate driver, reducing BOM count and PCB area in compact designs. |
| Dual-Mode Feedback Architecture | Supports both factory-preset (3.3V) and user-adjustable outputs via single pin (FB), simplifying design reuse across voltage variants. |
| Thermal Shutdown with 10°C Hysteresis | Protects against sustained overload or poor heatsinking by cycling output until junction cools below 150°C, preventing permanent damage. |
Applications
| Handheld Devices | Industrial Control Supplies |
|---|---|
Use Scenario: Powering ARM Cortex-M0+ microcontrollers and BLE radios in portable test meters with 9V alkaline or Li-ion sources. IC Role / Device Role / Timing Role: Primary 3.3V buck regulator delivering regulated rail to MCU core, peripherals, and RF transceiver. Use Value: 12μA quiescent current extends battery life beyond 12 months in intermittent-use instruments; 100% duty cycle maintains regulation down to 3.42V input. | Use Scenario: Providing isolated 3.3V logic supply for PLC I/O modules powered from 24V DC field buses. IC Role / Device Role / Timing Role: Local point-of-load converter generating clean 3.3V for digital isolators and ADC drivers in noisy industrial environments. Use Value: 4.5V–24V input range accommodates brownout conditions on 24V bus; 0.3% load regulation ensures stable reference for precision analog front-ends. |
| 9V Battery Systems | Backup Supplies |
Use Scenario: Regulating 3.3V for memory retention and real-time clock circuits in embedded systems using PP3 9V batteries. IC Role / Device Role / Timing Role: Low-quiescent buck converter sustaining critical functions during main power failure. Use Value: 3μA shutdown current preserves battery charge for >5 years in backup mode; dropout voltage <150mV ensures full utilization of battery's end-of-life voltage. | Use Scenario: Maintaining 3.3V supply to SRAM and configuration EEPROM during AC mains interruption in network routers. IC Role / Device Role / Timing Role: Standby power manager that activates only when primary supply fails. Use Value: Fast startup (<100µs) and tight output tolerance (±3.6%) prevent data corruption during switchover; SOT23 footprint minimizes board space in dense router PCBs. |
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+ | Higher output current (500mA), TDFN-8 package, 24V internal switch, but fixed 3.3V/5V options only - no adjustable mode. | Targeted at higher-load applications like FPGA I/O banks; lacks dual-mode feedback flexibility of MAX1836EUT33#G16. | Select MAX1776ETA+ when ≥300mA load current is required and board area allows TDFN-8; retain MAX1836EUT33#G16 for ultra-low IQ or SOT23-constrained layouts. |
| TPS62231DRYR | 3MHz fixed-frequency PWM, 300mA output, 2.05V–6.5V input, 17μA IQ - no 100% duty cycle or 24V rating. | Suitable for low-input systems (e.g., single Li-ion), but cannot replace MAX1836EUT33#G16 in 9V/24V industrial or battery-backup use cases. | Choose TPS62231DRYR only for sub-6.5V input designs where high switching frequency reduces inductor size; avoid for high-VIN or ultra-low-dropout requirements. |
Compared with MAX1776ETA+ and TPS62231DRYR, the MAX1836EUT33#G16 uniquely balances 24V input capability, 100% duty cycle for minimal dropout, 12μA quiescent current, and SOT23-6 footprint-making it irreplaceable in space- and battery-life-critical 9V/24V applications where adjustable output or ultra-low IQ is essential.
Availability
MAX1836EUT33#G16 is available at Aetrix Electronics and suitable for handheld devices, industrial control supplies, and backup supplies requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant sourcing.
Supply support for MAX1836EUT33#G16 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 communications markets.
The MAX1836/MAX1837 product line was designed specifically for low-power, high-input-voltage DC-DC conversion in battery-operated and distributed power systems-emphasizing efficiency at light loads, minimal dropout, and compact packaging.
FAQ
What is the preset output voltage of the MAX1836EUT33#G16?
The MAX1836EUT33#G16 is factory-trimmed to deliver a precise 3.3V output in preset mode (FB pin connected to GND). Its output tolerance is ±3.6%, corresponding to 3.168V–3.432V across temperature and load (0–125mA). This eliminates the need for external feedback resistors in standard 3.3V rail applications, reducing component count and layout complexity.
Can the MAX1836EUT33#G16 operate with input voltages below 4.5V?
No-the MAX1836EUT33#G16 has a specified minimum input voltage of 4.5V due to its internal undervoltage lockout (UVLO) threshold of 3.55V (rising) and 3.45V (falling). Attempting to operate below 4.5V risks erratic behavior or complete shutdown. For sub-4.5V inputs, consider alternatives like the MAX17503 or TPS62130, which support lower VIN ranges.
How does the MAX1836EUT33#G16 achieve 100% duty cycle operation?
The MAX1836EUT33#G16 achieves 100% duty cycle by holding its internal p-channel MOSFET continuously ON when the input voltage approaches the output voltage-eliminating switching losses and minimizing dropout. This is enabled by its current-limited control architecture, which bypasses fixed-frequency PWM and instead pulses only as needed to maintain regulation, allowing seamless transition into dropout without oscillation or instability.
What is the thermal shutdown behavior of the MAX1836EUT33#G16?
The MAX1836EUT33#G16 activates thermal shutdown at +160°C junction temperature, turning off the internal MOSFET to halt power dissipation. After cooling by 10°C (to ~150°C), it automatically resumes operation. This hysteresis prevents rapid cycling and protects against sustained overload. The SOT23-6 package dissipates 696mW at +70°C ambient, derating 8.7mW/°C above that point.
Is the MAX1836EUT33#G16 pin-compatible with other members of the MAX1836/MAX1837 family?
Yes-the MAX1836EUT33#G16 shares identical pinout and package (SOT23-6) with all EUT-suffix variants (e.g., MAX1836EUT50#G16, MAX1837EUT33#G16). However, output current ratings differ: MAX1836 variants support 125mA, while MAX1837 variants support 250mA. Swapping requires verification of load current and thermal margin, but no PCB changes are needed.
MAX1836EUT33#G16 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:
- 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-6
MAX1836EUT33#G16 FAQ
1.How can I place an order for MAX1836EUT33#G16 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1836EUT33#G16 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#G16 reliable?
The price and inventory of MAX1836EUT33#G16 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1836EUT33#G16 is usually 5 days.
3.What payment methods are accepted for MAX1836EUT33#G16?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1836EUT33#G16 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1836EUT33#G16?
MAX1836EUT33#G16 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1836EUT33#G16 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#G16?
For technical support, including MAX1836EUT33#G16 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1836EUT33#G16 requirements.
6.How does Aetrix verify that MAX1836EUT33#G16 is sourced from the original manufacturer or authorized distributors?
All MAX1836EUT33#G16 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#G16 meets industry standards.
7.What is the process for return or replacement of MAX1836EUT33#G16?
All MAX1836EUT33#G16 units undergo pre-shipment inspection (PSI). If there is an issue with MAX1836EUT33#G16, 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#G16 part is unused and in its original packaging.
Return procedure for MAX1836EUT33#G16:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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