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Analog Devices Inc./Maxim Integrated MAX1836ETT50+T
- Part No.:
- MAX1836ETT50+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- -
- Datasheet:
-
MAX1836ETT50+T.pdf
- Description:
- IC REG BUCK 5V 125MA 6TDFN
- Quantity:
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Inventory:3,648
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Product details
Overview
The MAX1836ETT50+T from Maxim Integrated is a high-efficiency, preset 5V step-down DC-DC converter with internal 24V p-channel MOSFET, 6-pin TDFN-EP package, 125mA output current capability, 4.5V–24V input range, and 100% duty-cycle operation enabling ultra-low dropout (120mV at 100mA) - ideal for space-constrained 9V battery systems and industrial control supplies.
For engineers reviewing the MAX1836ETT50+T datasheet, MAX1836ETT50+T pinout, MAX1836ETT50+T application, or MAX1836ETT50+T equivalent, key selection criteria include its fixed 5V output mode, 12μA quiescent current, thermal shutdown at 160°C, TDFN-EP package with exposed pad for thermal management, and compatibility with low-ESR ceramic or polymer output capacitors.
Technical Context
The MAX1836ETT50+T implements a proprietary current-limited control architecture operating up to 100% duty cycle, eliminating fixed-frequency PWM switching losses and reducing no-load supply current to 12μA. Its internal 24V-rated p-channel MOSFET features 2Ω typical on-resistance and 450mA current limit, enabling stable regulation down to VIN − VDROPOUT.
This device uses dual-mode feedback: FB grounded for factory-preset 5.00V ±2% output (4.80V–5.20V), or external resistor divider for adjustable 1.25V–VIN outputs. Shutdown input (SHDN) reduces supply current to 3μA, with 0.8V–2.4V logic threshold and mandatory connection to IN when VOUT > 5.5V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.00V ±2% (4.80V–5.20V) in preset mode; verified across −40°C to +85°C and 0–125mA load. |
| Input Voltage Range | 4.5V to 24V - supports wide-input industrial and battery-powered systems including 9V, 12V, and 24V rails. |
| Max Output Current | 125mA continuous - limited by internal MOSFET current limit (250–450mA) and thermal dissipation (1951mW at TA = +70°C). |
| Quiescent Current | 12μA typical at no load - enables multi-year battery life in always-on sensor or backup supply applications. |
| Dropout Voltage | 120mV at 100mA - achieved via 100% duty cycle; allows operation down to VIN = 5.12V while maintaining 5V regulation. |
| Shutdown Current | 3μA maximum - ensures minimal leakage during system sleep modes without external power gating. |
| Switching Frequency | Variable (≈1–2 MHz typical) - frequency increases with load; eliminates need for external frequency-setting components. |
| Thermal Shutdown | 160°C junction temperature with 10°C hysteresis - protects against sustained overload or poor PCB thermal design. |
Pinout & Package
MAX1836ETT50+T is housed in a 3mm × 3mm, 6-pin TDFN-EP package with exposed metal pad (EP) connected internally to GND for enhanced thermal performance and EMI reduction. The package is RoHS-compliant and rated for −40°C to +85°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - FB | Dual-mode feedback input | Grounded for 5V preset output; connects to resistive divider for adjustable outputs; 1.25V reference threshold with ±50mV hysteresis. |
| 2 - GND | Power and signal ground | Reference node for all internal circuitry; must be tied to EP pad and system ground plane for thermal and noise integrity. |
| 3 - IN | Main power input | Accepts 4.5V–24V; powers internal bias circuits and source of internal p-channel MOSFET; UVLO triggers at 3.45–4.4V. |
| 4 - LX | Switch node | Drain of internal p-channel MOSFET; connects to inductor; requires low-inductance layout to minimize ringing and EMI. |
| 5 - SHDN | Logic-controlled enable/disable | Active-low input; <0.8V disables IC (3μA IQ); >2.4V enables; must be tied to IN if VOUT > 5.5V or unused. |
| 6 - OUT | Output sense/feedback reference | Internally connected to feedback divider; tied to regulated output in preset mode; grounded in adjustable mode. |
| EP - Exposed Pad | Thermal and electrical ground | Internally bonded to GND; must be soldered to ≥1in² copper area for thermal derating and noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| 100% Duty-Cycle Operation | Enables lowest possible dropout voltage (120mV @ 100mA), extending usable battery voltage range in 9V systems. |
| Current-Limited Control Architecture | Eliminates unnecessary switching under light loads, reducing IQ to 12μA and improving efficiency at partial load vs. PWM. |
| Integrated 24V p-Channel MOSFET | Reduces BOM count and layout complexity; eliminates need for external high-voltage switch and gate driver. |
| Thermal Overload Protection | Auto-recovering shutdown at 160°C junction temp prevents permanent damage during sustained overcurrent or poor heatsinking. |
| Dual-Mode Feedback (Preset/Adjustable) | Factory-trimmed 5.00V output simplifies design; optional resistor divider enables custom voltages from 1.25V to VIN. |
| TDFN-EP Package with Exposed Pad | 3mm × 3mm footprint saves board space; exposed pad lowers θJA by ~30%, supporting higher ambient temperatures. |
Applications
| 9V Battery Systems | Notebook Computers |
|---|---|
Use Scenario: Powering low-power microcontrollers and sensors from single 9V alkaline or lithium primary cells. IC Role / Device Role / Timing Role: Primary 5V step-down regulator delivering stable rail with minimal quiescent current draw. Use Value: 12μA no-load IQ extends battery life beyond 5 years in always-on monitoring nodes; 100% duty cycle maintains regulation until VIN drops to 5.12V. |
Use Scenario: Providing auxiliary 5V supply for USB peripherals, card readers, or embedded controllers in compact notebooks. IC Role / Device Role / Timing Role: Secondary DC-DC converter stepping down main 12V or 19V bus to isolated 5V domain. Use Value: TDFN-EP package fits tight layout constraints; 125mA output supports multiple low-power peripherals without thermal throttling. |
| Distributed Power Systems | Industrial Control Supplies |
Use Scenario: Local point-of-load conversion in modular PLC backplanes or distributed I/O nodes with 24V backbone. IC Role / Device Role / Timing Role: Isolated 5V rail generator for microcontroller, ADC, and digital isolator biasing. Use Value: 4.5V–24V input range accommodates brownout and ripple on industrial 24V lines; thermal shutdown prevents field failures. |
Use Scenario: Powering analog front-ends, RS-485 transceivers, and programmable logic in DIN-rail mounted controllers. IC Role / Device Role / Timing Role: Robust 5V supply tolerant of harsh EMI, wide temperature, and transient overvoltage conditions. Use Value: Internal 24V MOSFET withstands 24V surges per IEC 61000-4-4; 160°C thermal protection ensures reliability in sealed enclosures. |
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 500mA output, same 4.5V–24V input, but uses internal 24V switch with different control scheme and larger 8-pin μMAX package. | Supports higher-current loads (e.g., motor drivers, FPGAs); not pin-compatible; requires redesign of feedback and compensation network. | Select MAX1776ETA+T only when >125mA output is required and board area permits larger package and revised layout. |
| TPS62231DRYT | 3MHz fixed-frequency buck, 300mA output, 2.05V–6.5V input, 1.8V–6.0V adjustable output; 2mm × 2mm WSON package. | Optimized for low-input-voltage Li-ion systems; incompatible with >6.5V inputs; lacks 100% duty cycle and UVLO for 24V operation. | Choose TPS62231DRYT only for sub-6.5V battery applications requiring higher frequency and smaller size; not suitable as direct replacement. |
Compared with MAX1776ETA+T and TPS62231DRYT, the MAX1836ETT50+T uniquely balances ultra-low IQ (12μA), 24V input tolerance, and 100% duty-cycle dropout performance in a miniature TDFN - making it optimal for long-life, wide-input, space-constrained 5V point-of-load designs.
Availability
MAX1836ETT50+T is available at Aetrix Electronics and suitable for 9V battery systems, notebook computers, and industrial control supplies requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX1836ETT50+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 applications.
The MAX1836/MAX1837 family was designed specifically for low-power, wide-input-voltage DC-DC conversion in battery-powered and industrial equipment - emphasizing ultra-low quiescent current, dropout resilience, and minimal external component count.
FAQ
What is the guaranteed output voltage accuracy of the MAX1836ETT50+T in preset 5V mode?
The MAX1836ETT50+T delivers a factory-trimmed output voltage of 5.00V with ±2% tolerance (4.80V to 5.20V) across full temperature (−40°C to +85°C) and load (0–125mA) ranges, as specified in the Electrical Characteristics table under "Output Voltage (Preset Mode)" with conditions FB = GND.
Can the MAX1836ETT50+T operate with input voltage below 4.5V?
No - the MAX1836ETT50+T has an absolute minimum input voltage of 4.5V due to internal undervoltage lockout (UVLO) activation at VIN < 3.45V (falling) and startup requirement above 3.55V (rising). Operation below 4.5V is not functional or guaranteed; attempting it may cause erratic regulation or failure to start.
How does the MAX1836ETT50+T achieve 100% duty cycle, and what design impact does this have?
The MAX1836ETT50+T achieves 100% duty cycle by holding its internal p-channel MOSFET fully on when the output approaches dropout - eliminating switching losses and minimizing VIN–VOUT differential. This directly enables a measured 120mV dropout at 100mA, allowing continued 5V regulation down to VIN = 5.12V, critical for maximizing battery runtime.
Is the exposed pad (EP) on the MAX1836ETT50+T electrically connected, and how must it be handled in layout?
Yes - the exposed pad on the MAX1836ETT50+T is internally connected to GND and serves both thermal and electrical functions. It must be soldered to a dedicated PCB copper pour tied to system GND, with ≥1in² area recommended for thermal derating; floating or unconnected EP degrades thermal performance and may cause instability or premature thermal shutdown.
Does the MAX1836ETT50+T support adjustable output voltages, and if so, what is the valid range?
Yes - when configured in adjustable mode (FB connected to resistor divider, OUT tied to GND), the MAX1836ETT50+T supports output voltages from 1.25V to VIN, referenced to its internal 1.25V feedback threshold (VFB = 1.25V ±50mV). However, outputs above 5.5V require SHDN permanently tied to IN, disabling shutdown functionality.
MAX1836ETT50+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- *
- Package/Case:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- -
- Output Configuration:
- -
- Topology:
- -
- Output Type:
- -
- Number of Outputs:
- -
- Voltage - Input (Min):
- -
- Voltage - Input (Max):
- -
- Voltage - Output (Min/Fixed):
- -
- Voltage - Output (Max):
- -
- Current - Output:
- -
- Frequency - Switching:
- -
- Synchronous Rectifier:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
MAX1836ETT50+T FAQ
1.How can I place an order for MAX1836ETT50+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1836ETT50+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 MAX1836ETT50+T reliable?
The price and inventory of MAX1836ETT50+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1836ETT50+T is usually 5 days.
3.What payment methods are accepted for MAX1836ETT50+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1836ETT50+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1836ETT50+T?
MAX1836ETT50+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1836ETT50+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 MAX1836ETT50+T?
For technical support, including MAX1836ETT50+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1836ETT50+T requirements.
6.How does Aetrix verify that MAX1836ETT50+T is sourced from the original manufacturer or authorized distributors?
All MAX1836ETT50+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 MAX1836ETT50+T meets industry standards.
7.What is the process for return or replacement of MAX1836ETT50+T?
All MAX1836ETT50+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX1836ETT50+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 MAX1836ETT50+T part is unused and in its original packaging.
Return procedure for MAX1836ETT50+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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