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Analog Devices Inc./Maxim Integrated MAX1836ETT50+
- Part No.:
- MAX1836ETT50+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 6-WDFN Exposed Pad
- Datasheet:
-
MAX1836ETT50+.pdf
- Description:
- IC REG BCK ADJ/1.25V 125MA 6TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:23,520
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Product details
Overview
MAX1836ETT50+ from Maxim Integrated is a 5V preset, high-efficiency 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) - designed for space-constrained battery-powered systems such as handheld devices and industrial control supplies.
For engineers reviewing the MAX1836ETT50+ datasheet, MAX1836ETT50+ pinout, MAX1836ETT50+ application, or MAX1836ETT50+ equivalent, key selection criteria include its TDFN-EP package footprint, 12µA quiescent current, dual-mode feedback (preset/adjustable), thermal shutdown at +160°C, and compatibility with low-ESR ceramic or polymer output capacitors in compact 3mm × 3mm layouts.
Technical Context
The MAX1836ETT50+ employs a proprietary current-limited control architecture that dynamically adjusts switching frequency to maintain regulation - eliminating unnecessary switching under light loads and achieving 12µA no-load supply current. Its 100% duty-cycle capability enables continuous conduction down to VIN − VOUT = 120mV, critical for extending usable battery voltage range in 9V or multi-cell systems.
This device integrates internal current sensing, undervoltage lockout (3.45V–4.3V threshold), and thermal overload protection with 10°C hysteresis. The LX switch features 1.1Ω typical on-resistance and 312mA current limit, while FB pin supports both preset 5V mode (FB = GND) and adjustable mode (1.25V–VIN) via external resistor divider.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Preset 5.00V ±4% (typical 4.80–5.20V), factory-trimmed - eliminates external feedback resistors in fixed-output designs. |
| Max Output Current | 125mA continuous - sufficient for low-power microcontrollers, sensors, and interface ICs without external boost stages. |
| Input Voltage Range | 4.5V to 24V - supports wide-input industrial rails, 9V batteries, and distributed 12V/24V systems without pre-regulation. |
| Quiescent Current | 12µA at no load - extends battery life in always-on monitoring or sleep-mode applications. |
| Dropout Voltage | 120mV at 100mA load - enables operation down to VIN = 5.12V while maintaining 5V regulation, maximizing battery utilization. |
| Shutdown Current | 3µA max - reduces system standby power when disabled via SHDN pin. |
| Switching Frequency | Variable (≈1–2MHz typical) - scales with load to optimize efficiency; enables use of small 22–47µH inductors and 100µF polymer output caps. |
Pinout & Package
MAX1836ETT50+ is housed in a thermally enhanced 6-pin TDFN-EP (3mm × 3mm, 0.75mm height) with exposed pad (EP) tied internally to GND - requires soldering EP to PCB ground plane for optimal thermal dissipation (1951mW @ TA = +70°C) and EMI suppression.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 FB | Dual-mode feedback input | Connect to GND for preset 5V output; connect to resistive divider for adjustable 1.25V–VIN output - internal 1.25V reference with ±50mV threshold for mode detection. |
| 2 GND | Power and signal ground | Primary return path for LX switch, internal bias, and feedback network - must be connected to EP pad for thermal and noise integrity. |
| 3 IN | Input supply connection | Accepts 4.5V–24V; powers internal circuitry and feeds source of internal P-MOSFET - requires local 10µF/25V input capacitor near pin. |
| 4 LX | Switch node | Drain of internal 24V P-channel MOSFET - connects to inductor; switches between IN and GND; peak current limited to 312mA (typ). |
| 5 SHDN | Logic-controlled enable/disable | Active-low shutdown: <0.8V disables regulator (3µA ISHDN); >2.4V enables - must not float; tie to IN if unused or for >5.5V adjustable outputs. |
| 6 OUT | Output sense input | Internally connected to preset divider - connect to regulated 5V output in preset mode; connect to GND in adjustable mode. |
Key Features
| Feature | Design Value |
|---|---|
| 100% Duty-Cycle Operation | Enables dropout as low as 120mV - sustains 5V output even when input drops to 5.12V, critical for end-of-life battery operation. |
| 12µA Quiescent Current | Reduces no-load power loss to <60µW at 5V - ideal for always-on sensor nodes and remote telemetry where battery replacement is impractical. |
| Dual-Mode Feedback (FB) | Eliminates BOM cost and layout area for preset 5V use (FB = GND), while retaining flexibility for custom voltages (1.25V–VIN) via external resistors. |
| Integrated 24V P-Channel Switch | Removes need for external high-voltage MOSFET and gate driver - simplifies design, reduces component count, and improves reliability in harsh environments. |
| Thermal Shutdown with Hysteresis | Shuts down at +160°C junction temperature and re-enables at +150°C - prevents thermal runaway during sustained overload or poor heatsinking. |
Applications
| Handheld Medical Devices | Industrial Sensor Transmitters |
|---|---|
|
Use Scenario: Portable blood glucose meters and pulse oximeters powered by single 9V alkaline batteries requiring stable 5V rail for MCU and analog front-end. IC Role / Device Role / Timing Role: Primary step-down regulator delivering regulated 5V from decaying 9V–5.5V battery input, using 100% duty cycle to extend usable battery life. Use Value: 12µA quiescent current minimizes standby drain; 120mV dropout allows operation until battery reaches 5.12V - adding ~15% runtime vs. conventional buck converters. |
Use Scenario: 4–20mA loop-powered pressure/temperature transmitters drawing <10mA from loop supply, needing isolated 5V for signal conditioning and ADC. IC Role / Device Role / Timing Role: Compact, low-noise 5V supply derived from loop voltage (typically 12–24V) - operates within strict loop power budget and meets EMC requirements. Use Value: TDFN-EP package fits tight loop transmitter enclosures; variable-frequency control avoids fixed switching noise interfering with precision analog measurements. |
| Backup Power Supplies | Low-Power IoT Edge Nodes |
|
Use Scenario: SRAM or real-time clock backup circuits powered by supercapacitors or coin cells, requiring regulated 5V during main power failure. IC Role / Device Role / Timing Role: Ultra-low-quiescent regulator maintaining 5V output from decaying supercapacitor (e.g., 5.5V → 4.5V) with minimal self-discharge. Use Value: 3µA shutdown current preserves backup energy; 100% duty cycle ensures regulation until capacitor voltage falls to 5.12V - maximizing hold-up time. |
Use Scenario: Battery-operated LoRaWAN or NB-IoT sensor nodes transmitting intermittently, spending >99% time in deep sleep with µA-level system current. IC Role / Device Role / Timing Role: Primary power converter supplying 5V to MCU and radio during active bursts, then entering ultra-low-power state between transmissions. Use Value: 12µA IQ dominates system sleep current - enables multi-year battery life on CR2032 or AA cells without complex power gating. |
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 500mA output, 24V internal switch, but fixed 3.3V/5V options only - no adjustable mode; 20µA IQ. | Better suited for higher-current loads (e.g., FPGA I/O banks), but lacks FB flexibility and has higher quiescent current. | Select MAX1776ETA+ only when >125mA is required and adjustable output is unnecessary. |
| TPS62231DRVR | 3MHz fixed-frequency PWM, 300mA output, 2.05–6.0V input - narrower VIN range; 17µA IQ; requires external feedback for all outputs. | Optimized for ultra-small inductors in portable audio or wearables; less suitable for wide-input industrial or battery-decay scenarios. | Choose TPS62231DRVR when board space is paramount and input stays >2.05V; avoid for 9V battery or 24V industrial use. |
Compared with MAX1776ETA+ and TPS62231DRVR, the MAX1836ETT50+ uniquely balances ultra-low IQ (12µA), wide 4.5–24V input, 100% duty cycle for battery extension, and dual-mode FB - making it optimal for cost-sensitive, long-life, wide-input embedded systems where efficiency at light load and dropout performance are critical.
Availability
MAX1836ETT50+ is available at Aetrix Electronics and suitable for handheld medical devices, industrial sensor transmitters, backup power supplies, and low-power IoT edge nodes requiring stable component supply with guaranteed long-term availability.
Supply support for MAX1836ETT50+ 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 engineered for ultra-low-power, wide-input DC-DC conversion in battery-critical and space-constrained applications - emphasizing dropout minimization, quiescent current reduction, and integrated switch simplicity.
FAQ
What is the maximum input voltage rating for MAX1836ETT50+?
The MAX1836ETT50+ has an absolute maximum input voltage of +25V, with recommended operating range from 4.5V to 24V. Exceeding 25V risks permanent damage. Its internal 24V P-channel MOSFET and robust UVLO (3.45–4.3V threshold) ensure reliable startup and operation across this full range - critical for industrial 24V rails and aging battery inputs.
Does MAX1836ETT50+ support adjustable output voltage, and how is it configured?
Yes, MAX1836ETT50+ supports adjustable output from 1.25V to VIN using its dual-mode FB pin. To configure: disconnect OUT from output, tie OUT to GND, and connect a resistor divider from output to FB. With VFB = 1.25V (±4%), R1/R2 ratio sets VOUT. Note: outputs >5.5V require SHDN permanently tied to IN to disable shutdown functionality.
What is the thermal performance of MAX1836ETT50+ in its TDFN-EP package?
In the 6-pin TDFN-EP package, MAX1836ETT50+ delivers 1951mW continuous power dissipation at +70°C ambient (derating 24.4mW/°C above), enabled by the exposed pad (EP) tied to PCB ground. Thermal shutdown activates at +160°C junction temperature with 10°C hysteresis - ensuring safe operation under sustained 125mA load with proper copper pour and airflow.
How does the current-limited control scheme of MAX1836ETT50+ improve efficiency compared to fixed-frequency PWM?
The MAX1836ETT50+ uses variable-frequency, current-limited control - pulsing only as needed to maintain regulation. This eliminates idle switching losses present in fixed-frequency PWM, reducing no-load supply current to 12µA. At light loads, frequency drops, minimizing gate charge and switching losses - yielding >90% efficiency even at 1mA, unlike constant-frequency alternatives.
Can MAX1836ETT50+ be used in inverting (negative output) configurations?
Yes, MAX1836ETT50+ supports inverter configuration per Figure 7 in the datasheet: connect the nominal "output" to system ground, and the GND pin becomes regulated −5V. Critical constraints apply - keep |VIN − VGND| ≤ 24V and |VOUT − VGND| ≤ 5.5V. For MAX1836ETT50+, this yields −5V output with same 125mA capability and dropout characteristics.
MAX1836ETT50+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 6-WDFN Exposed Pad
- Packaging:
- Bulk
- 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 (5V)
- 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-EP (3x3)
MAX1836ETT50+ FAQ
1.How can I place an order for MAX1836ETT50+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1836ETT50+ 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+ reliable?
The price and inventory of MAX1836ETT50+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1836ETT50+ is usually 5 days.
3.What payment methods are accepted for MAX1836ETT50+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1836ETT50+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1836ETT50+?
MAX1836ETT50+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1836ETT50+ 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+?
For technical support, including MAX1836ETT50+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1836ETT50+ requirements.
6.How does Aetrix verify that MAX1836ETT50+ is sourced from the original manufacturer or authorized distributors?
All MAX1836ETT50+ 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+ meets industry standards.
7.What is the process for return or replacement of MAX1836ETT50+?
All MAX1836ETT50+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1836ETT50+, 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+ part is unused and in its original packaging.
Return procedure for MAX1836ETT50+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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