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Analog Devices Inc./Maxim Integrated MAX1836EUT+T
- Part No.:
- MAX1836EUT+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SOT-23-6
- Datasheet:
-
MAX1836EUT+T.pdf
- Description:
- IC REG BUCK ADJ 125MA SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:1,997
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Product details
Overview
The MAX1836EUT+T from Maxim Integrated is a high-efficiency, 6-pin SOT23 step-down DC-DC converter with internal 24V P-channel MOSFET, preset 5V output, 125mA load capability, 4.5V–24V input range, and 12μA quiescent current-designed for space-constrained battery-powered systems such as handheld devices and industrial control supplies.
For engineers reviewing the MAX1836EUT+T datasheet, MAX1836EUT+T pinout, MAX1836EUT+T application, or MAX1836EUT+T equivalent, key selection criteria include dropout voltage (120mV at 100mA), 100% duty-cycle operation, adjustable output mode (1.25V to VIN), and thermal shutdown at 160°C with 10°C hysteresis.
Technical Context
The MAX1836EUT+T employs a proprietary current-limited control architecture that enables variable-frequency operation up to 100% duty cycle, eliminating unnecessary switching under light loads and reducing no-load supply current to 12μA. Its internal 24V-rated P-channel MOSFET features 1.1Ω typical on-resistance and integrates current sensing and zero-crossing detection.
This device operates in discontinuous conduction mode with a minimum off-time of 0.2μs and maximum on-time of 10μs, delivering regulated output via feedback through the FB pin-either in preset mode (FB = GND) or adjustable mode (external resistor divider), with VFB = 1.25V ±50mV reference accuracy.
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 | Preset 5.00V ±2% - factory-trimmed for stable 5V 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 or sleep-mode applications like remote sensors. |
| Dropout Voltage | 120mV at 100mA - enables operation down to VIN = 5.12V while maintaining regulation at 5V output. |
| Switching On-Resistance | 1.1Ω (typ) - minimizes conduction loss and thermal rise in compact SOT23 package. |
| Shutdown Current | 3μA - ensures ultra-low power consumption when disabled, critical for energy-harvesting nodes. |
Pinout & Package
MAX1836EUT+T is housed in a 6-pin SOT23 package (JEDEC MO-178AA) with exposed pad (not electrically connected internally but recommended for thermal grounding). Pin 1 is FB, Pin 2 is GND, Pin 3 is IN, Pin 4 is LX, Pin 5 is SHDN, and Pin 6 is OUT.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB (Pin 1) | Dual-mode feedback input | Connect to GND for preset 5V output; connect to resistive divider for adjustable output (1.25V–VIN); VFB = 1.25V ±50mV reference. |
| GND (Pin 2) | Power and signal ground reference | Common return path for internal circuitry, LX current sink, and thermal pad connection point. |
| IN (Pin 3) | Main power input | Supplies 4.5V–24V; connects to source of internal P-MOSFET; UVLO threshold 3.55–4.4V (rising). |
| LX (Pin 4) | Switch node | Drain of internal P-MOSFET; drives external inductor; rated for -2V to (VIN + 0.3V) swing. |
| SHDN (Pin 5) | Logic-controlled enable/disable | Low-active input; <0.8V disables IC (3μA ISHDN); >2.4V enables; min slew rate 10V/ms. |
| OUT (Pin 6) | 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 lowest possible dropout voltage (120mV @ 100mA), extending usable battery voltage range. |
| Current-limited control scheme | Eliminates fixed-frequency PWM losses; reduces light-load IIN to 12μA without compromising regulation. |
| Integrated 24V P-channel MOSFET | Removes need for external high-voltage switch; simplifies BOM and layout for 24V-input designs. |
| Thermal shutdown with hysteresis | Protects against sustained overload: trips at 160°C, resets at 150°C-prevents thermal runaway in enclosed enclosures. |
| Dual-mode feedback (preset/adjustable) | Supports drop-in 5V use (FB = GND) or flexible design reuse (external divider), reducing SKU count across product variants. |
Applications
| Handheld Medical Devices | Industrial Sensor Nodes |
|---|---|
Use Scenario: Portable blood glucose meters and pulse oximeters powered by single 9V alkaline batteries. IC Role / Device Role / Timing Role: Primary 5V power rail generator stepping down from 9V battery, enabling MCU, display, and analog front-end operation. Use Value: 12μA quiescent current extends shelf life and operational runtime; 100% duty cycle maintains regulation until battery drops to ~5.1V. | Use Scenario: Wireless temperature/humidity sensors deployed in factory automation with 24V plant power. IC Role / Device Role / Timing Role: Local 5V supply for low-power microcontroller and RF transceiver, isolated from noisy 24V bus. Use Value: 24V input rating eliminates need for pre-regulator; 125mA output supports active sensor biasing and short-burst radio transmission. |
| Backup Power Supplies | 4–20mA Loop-Powered Instruments |
Use Scenario: Fail-safe 5V rail for real-time clock and SRAM during main power interruption in PLC modules. IC Role / Device Role / Timing Role: Standby regulator activated only when primary supply fails, drawing minimal current from backup capacitor. Use Value: 3μA shutdown current maximizes hold-up time; fast startup (<100μs) ensures uninterrupted memory retention. | Use Scenario: Two-wire field transmitters where loop power must simultaneously feed sensor electronics and 4–20mA output stage. IC Role / Device Role / Timing Role: Efficient local 5V supply derived from loop voltage (typically 12–24V), powering precision ADC and DAC circuitry. Use Value: High efficiency (>90% at 50mA) minimizes heat in sealed housings; dropout performance preserves regulation even at low loop voltages (~12V). |
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, 24V internal switch, but fixed 5V output only (no adjustable mode). | Suitable for higher-current loads; requires different PCB footprint (TDFN vs. SOT23) and lacks FB pin flexibility. | Select when >125mA is required and board area allows TDFN; not pin-compatible with MAX1836EUT+T. |
| TPS62231DRVR | 3MHz fixed-frequency PWM, 300mA output, 2.05–6.5V input, 5V preset, 17μA quiescent current, 5-pin SOT23. | Higher switching frequency enables smaller inductors; lower input voltage ceiling limits use to ≤6.5V systems. | Choose for compact 3–5V battery systems where size outweighs input voltage range; differs in pin count and control architecture. |
Compared with MAX1776ETA+T and TPS62231DRVR, the MAX1836EUT+T uniquely balances ultra-low quiescent current (12μA), wide 4.5–24V input, and dual-mode feedback in a standard 6-pin SOT23-making it optimal for cost-sensitive, battery-life-critical 5V rail generation where moderate current suffices.
Availability
MAX1836EUT+T is available at Aetrix Electronics and suitable for handheld medical devices, industrial sensor nodes, backup power supplies, and 4–20mA loop-powered instruments requiring stable component supply and long-term production continuity.
Supply support for MAX1836EUT+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 MAX1836EUT+T belongs to Maxim's high-voltage step-down converter product line, designed specifically for battery-powered and distributed power systems needing efficient, low-quiescent-current regulation from inputs up to 24V.
FAQ
What is the preset output voltage of the MAX1836EUT+T?
The MAX1836EUT+T is factory-configured for a preset 5.00V output with ±2% tolerance (4.80V to 5.20V) when the FB pin is connected to GND. This eliminates external feedback resistors for standard 5V rail applications, simplifying design and reducing BOM cost. The "50" suffix in the full part number MAX1836EUT50-T confirms the 5V variant, and the MAX1836EUT+T designation refers to this exact 5V SOT23 version.
Can the MAX1836EUT+T operate with input voltages below 4.5V?
No-the MAX1836EUT+T has a guaranteed operating input range of 4.5V to 24V, with undervoltage lockout (UVLO) activating below 3.55V (rising) and releasing above 3.45V (falling). Operation below 4.5V risks failure to start or maintain regulation. For sub-4.5V applications, consider alternatives like the MAX17503 or TPS62130, which support lower VIN. The MAX1836EUT+T is not rated or characterized for reliable function below its specified 4.5V minimum.
How does the MAX1836EUT+T achieve 100% duty cycle, and what is its practical benefit?
The MAX1836EUT+T achieves 100% duty cycle by holding its internal P-channel MOSFET continuously on when the input voltage approaches the output level-bypassing switching entirely to minimize dropout. This yields a measured 120mV dropout at 100mA, allowing regulation down to VIN = 5.12V for a 5V output. The practical benefit is extended battery life in 9V or multi-cell systems, as the device remains functional deeper into battery discharge than fixed-frequency converters requiring minimum off-time.
What is the maximum allowable output voltage when using external feedback with the MAX1836EUT+T?
When using external feedback (i.e., connecting a resistor divider to the FB pin), the MAX1836EUT+T supports an adjustable output range from 1.25V to VIN. However, if the output voltage exceeds 5.5V, the shutdown feature becomes unavailable and the SHDN pin must be permanently tied to IN. This restriction arises from internal voltage limitations on the SHDN input structure-not a general output ceiling. So while 6V or 12V outputs are technically possible with proper SHDN handling, the MAX1836EUT+T is optimized for ≤5.5V applications.
Does the MAX1836EUT+T require an external Schottky diode, and what are the key selection criteria?
Yes-the MAX1836EUT+T requires an external Schottky diode (D1) in its buck topology to provide the freewheeling path during MOSFET off-time. Key selection criteria include: reverse breakdown voltage > VIN(MAX) (e.g., ≥30V for 24V input), forward voltage < 0.4V at peak inductor current, RMS current rating ≥0.5A, and fast recovery (<50ns). Recommended parts include Nihon EP05Q03L or ON Semiconductor MBR0530. Ceramic capacitors alone cannot replace the diode; omission will cause catastrophic failure.
MAX1836EUT+T 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
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 24V
- Voltage - Output (Min/Fixed):
- 1.25V
- Voltage - Output (Max):
- 24V
- 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-23-6
MAX1836EUT+T FAQ
1.How can I place an order for MAX1836EUT+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1836EUT+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 MAX1836EUT+T reliable?
The price and inventory of MAX1836EUT+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1836EUT+T is usually 5 days.
3.What payment methods are accepted for MAX1836EUT+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1836EUT+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1836EUT+T?
MAX1836EUT+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1836EUT+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 MAX1836EUT+T?
For technical support, including MAX1836EUT+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1836EUT+T requirements.
6.How does Aetrix verify that MAX1836EUT+T is sourced from the original manufacturer or authorized distributors?
All MAX1836EUT+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 MAX1836EUT+T meets industry standards.
7.What is the process for return or replacement of MAX1836EUT+T?
All MAX1836EUT+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX1836EUT+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 MAX1836EUT+T part is unused and in its original packaging.
Return procedure for MAX1836EUT+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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