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Analog Devices Inc./Maxim Integrated MAX1836ETT33+T
- Part No.:
- MAX1836ETT33+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 6-WDFN Exposed Pad
- Datasheet:
-
MAX1836ETT33+T.pdf
- Description:
- IC REG BCK ADJ/1.25V 125MA 6TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,460
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Product details
Overview
The MAX1836ETT33+T from Maxim Integrated is a high-efficiency, 3.3V fixed-output step-down DC-DC converter with internal 24V p-channel MOSFET, 125mA output current capability, 4.5V–24V input range, 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 where low quiescent current (12μA) and minimal external components are critical.
For engineers reviewing the MAX1836ETT33+T datasheet, MAX1836ETT33+T pinout, MAX1836ETT33+T application, or MAX1836ETT33+T equivalent, key selection criteria include its TDFN-EP 6-pin package, preset 3.3V output without external feedback, shutdown current of 3μA, and compatibility with small inductors (e.g., 47µH) and ceramic output capacitors - all essential for compact, low-power embedded power rails.
Technical Context
The MAX1836ETT33+T implements a proprietary current-limited control architecture that dynamically adjusts switching frequency based on load, eliminating unnecessary switching under light loads to maintain 12μA quiescent current. Its 100% duty-cycle capability enables operation down to VIN = VOUT + 120mV, making it suitable for deep battery discharge scenarios.
This device integrates an internal 24V-rated p-channel MOSFET with typical RDS(ON) of 1.1Ω, dual-mode feedback (preset or adjustable), and thermal shutdown at +160°C with 10°C hysteresis. The LX node supports discontinuous conduction mode with minimum off-time of 0.2µs and maximum on-time of 10µs, ensuring stable regulation across 0–125mA loads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±3.6% (3.168V–3.432V) - factory-trimmed, no external resistors required for standard use. |
| Input Voltage Range | 4.5V to 24V - supports wide-input industrial and multi-cell battery systems including 9V and 24V rails. |
| Max Output Current | 125mA - sufficient for powering microcontrollers, sensors, and low-power logic in portable equipment. |
| Quiescent Current | 12μA - enables >1-year battery life in always-on monitoring applications using primary alkaline cells. |
| Dropout Voltage | 120mV at 100mA - allows usable operation down to VIN = 3.42V when regulating 3.3V, extending battery runtime. |
| Shutdown Current | 3μA - reduces system standby power to negligible levels during sleep or hibernation modes. |
| Switching Frequency | Variable (≈1–2MHz typical) - scales with load to optimize efficiency; enables use of 47µH surface-mount inductors. |
Pinout & Package
MAX1836ETT33+T is housed in a thermally enhanced 6-pin TDFN-EP (3mm × 3mm, 0.75mm height) package with exposed pad (EP) for improved thermal dissipation and grounding. The EP must be soldered to a PCB ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 FB | Dual-mode feedback input | Connect to GND for 3.3V preset mode; connect to voltage divider for adjustable output (1.25V–VIN). |
| 2 GND | Power and signal ground reference | Primary return path for internal circuitry and high-current LX switching loop; tied to EP for thermal performance. |
| 3 IN | Main power input | Accepts 4.5V–24V supply; connects to source of internal p-channel MOSFET; requires local 10µF ceramic bypass capacitor. |
| 4 LX | Switch node | Drain of internal p-channel MOSFET; connects to inductor and catch diode; carries high di/dt switching current. |
| 5 SHDN | Logic-controlled shutdown enable | Active-low input; pulls supply current to 3μA when grounded; must be tied to IN if unused or for >5.5V outputs. |
| 6 OUT | High-impedance output sense | Internally connected 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), maximizing usable battery voltage range in portable designs. |
| 12μA quiescent current | Extends shelf life and operational runtime in battery-powered IoT sensors and remote monitors without compromising regulation. |
| Internal 24V p-channel MOSFET | Eliminates need for external high-voltage switch; simplifies BOM and layout while supporting up to 24V input directly. |
| Dual-mode feedback (preset/adjustable) | Reduces design iteration time: default 3.3V output requires zero external components; adjustable mode supports 1.25V–VIN via resistor divider. |
| Thermal shutdown with hysteresis | Protects against sustained overload or poor heatsinking by cycling off at +160°C and re-enabling at +150°C, preventing latch-up. |
Applications
| Handheld Medical Devices | Industrial Sensor Nodes |
|---|---|
Use Scenario: Powering low-power MCU, analog front-end, and BLE radio in portable blood glucose meters or pulse oximeters running from single 9V or dual AA batteries. IC Role / Device Role / Timing Role: Primary 3.3V system rail regulator delivering stable voltage despite battery voltage decay from 9V to 4.5V. Use Value: 12μA quiescent current and 100% duty cycle extend battery life beyond 18 months; TDFN package saves PCB area in compact enclosures. |
Use Scenario: Providing isolated 3.3V supply for 4–20mA loop-powered temperature/pressure transmitters in hazardous-area process control systems. IC Role / Device Role / Timing Role: Local point-of-load regulator converting loop-derived 12–24V into clean 3.3V for signal conditioning and ADC reference. Use Value: Input UVLO (3.55V rising) prevents erratic behavior during brownout; 24V input rating ensures compatibility with field wiring constraints. |
| Backup Power Supplies | Low-Power Notebook Peripherals |
Use Scenario: Maintaining real-time clock (RTC) and SRAM retention during main power failure in telecom base stations or network routers using supercapacitor backup. IC Role / Device Role / Timing Role: Ultra-low-IQ buck converter sustaining 3.3V rail from decaying supercap voltage (down to 4.5V) with minimal energy loss. Use Value: 3μA shutdown current preserves backup energy; 120mV dropout allows full utilization of stored charge before cutoff. |
Use Scenario: Supplying 3.3V to USB-C PD accessory controllers, display interface ICs, or fingerprint sensors in ultrabooks and 2-in-1 laptops. IC Role / Device Role / Timing Role: Secondary power rail generator from main 12V or 19V adapter, replacing discrete LDOs for higher efficiency. Use Value: >90% peak efficiency at 100mA reduces thermal load near sensitive RF sections; small TDFN footprint avoids routing congestion. |
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), same 3.3V preset, but uses internal 24V switch with different control scheme and larger SOT23-6 package. | Supports higher-power peripherals (e.g., SSD controllers); less suitable for ultra-low-IQ battery monitoring due to 25μA quiescent current. | Select MAX1776ETA+ only when >125mA load current or lower dropout under heavier loads is required. |
| TPS62231DRYR | 3.3V fixed output, 400mA capability, 17μA quiescent current, 2.05–6.5V input range - narrower VIN, higher IQ, different pinout. | Optimized for single-cell Li-ion (3.0–4.2V) systems; not rated for 24V input or industrial battery stacks. | Choose TPS62231DRYR for cost-sensitive consumer electronics with <6.5V input; avoid for 9V/24V battery or industrial use. |
Compared with MAX1776ETA+ and TPS62231DRYR, the MAX1836ETT33+T uniquely balances ultra-low quiescent current (12μA), wide 4.5–24V input, and compact TDFN packaging - making it optimal for long-life, high-input-voltage, space-constrained applications where efficiency at light loads matters most.
Availability
MAX1836ETT33+T is available at Aetrix Electronics and suitable for handheld medical devices, industrial sensor nodes, backup power supplies, and low-power notebook peripherals requiring stable component supply across extended production lifecycles.
Supply support for MAX1836ETT33+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 MAX1836/MAX1837 family was designed specifically for low-power, wide-input-voltage DC-DC conversion in battery-operated and distributed power systems - emphasizing efficiency at light loads, minimal external components, and robust operation across harsh voltage ranges.
FAQ
What is the maximum input voltage supported by the MAX1836ETT33+T?
The MAX1836ETT33+T supports an absolute maximum input voltage of 24V, with guaranteed operation across 4.5V to 24V. This makes it suitable for 9V battery systems, 12V industrial rails, and 24V distributed power architectures. Exceeding 24V risks permanent damage per Absolute Maximum Ratings.
Can the MAX1836ETT33+T be used in adjustable-output configurations?
Yes, the MAX1836ETT33+T supports adjustable output from 1.25V to VIN by connecting a resistive divider between OUT and FB, and grounding OUT. However, when configured for outputs above 5.5V, the SHDN pin must be permanently tied to IN, disabling shutdown functionality per datasheet Note 2.
What is the thermal performance of the MAX1836ETT33+T in its TDFN-EP package?
The MAX1836ETT33+T in TDFN-EP delivers 1951mW continuous power dissipation at TA = +70°C (derating 24.4mW/°C above), significantly higher than the 696mW of the SOT23 variant. Proper soldering of the exposed pad to a thermal pad is essential to achieve this rating and prevent thermal shutdown at 160°C.
Does the MAX1836ETT33+T require an external catch diode?
Yes, the MAX1836ETT33+T requires an external Schottky diode (e.g., Nihon EP05Q03L) connected between LX and GND. The internal switch is a p-channel MOSFET, so the diode provides the freewheeling path during off-time. Omitting it causes catastrophic failure due to inductive kickback.
How does the MAX1836ETT33+T achieve 100% duty cycle, and why is it important?
The MAX1836ETT33+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 extends usable battery voltage down to 3.42V for 3.3V output, directly increasing runtime in portable applications.
MAX1836ETT33+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 6-WDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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:
- 6-TDFN (3x3)
MAX1836ETT33+T FAQ
1.How can I place an order for MAX1836ETT33+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1836ETT33+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 MAX1836ETT33+T reliable?
The price and inventory of MAX1836ETT33+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1836ETT33+T is usually 5 days.
3.What payment methods are accepted for MAX1836ETT33+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1836ETT33+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1836ETT33+T?
MAX1836ETT33+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1836ETT33+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 MAX1836ETT33+T?
For technical support, including MAX1836ETT33+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1836ETT33+T requirements.
6.How does Aetrix verify that MAX1836ETT33+T is sourced from the original manufacturer or authorized distributors?
All MAX1836ETT33+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 MAX1836ETT33+T meets industry standards.
7.What is the process for return or replacement of MAX1836ETT33+T?
All MAX1836ETT33+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX1836ETT33+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 MAX1836ETT33+T part is unused and in its original packaging.
Return procedure for MAX1836ETT33+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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