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Analog Devices Inc./Maxim Integrated MAX1836EUT50#TG40
- Part No.:
- MAX1836EUT50#TG40
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SOT-23-6
- Datasheet:
-
MAX1836EUT50#TG40.pdf
- Description:
- IC REG BUCK 5V 125MA SOT6
- Quantity:
- Payment:
- Shipping:
Inventory:2,819
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Product details
Overview
The MAX1836EUT50#TG40 from Maxim Integrated is a high-efficiency, 6-pin SOT23 step-down DC-DC converter with preset 5.0V output, 4.5V–24V input range, and internal 24V P-channel MOSFET delivering up to 125mA load current. It features 100% duty-cycle operation for low dropout (120mV at 100mA), 12μA quiescent current, and operates in space-constrained battery-powered systems such as handheld devices and industrial control supplies.
For engineers reviewing the MAX1836EUT50#TG40 datasheet, MAX1836EUT50#TG40 pinout, MAX1836EUT50#TG40 application, or MAX1836EUT50#TG40 equivalent, key selection criteria include its fixed 5V output mode, SOT23 package compatibility, dropout performance under light-to-moderate loads, and shutdown current of 3μA - all critical for low-power embedded power rail design.
Technical Context
The MAX1836EUT50#TG40 employs a proprietary current-limited control architecture enabling variable-frequency discontinuous-conduction-mode (DCM) operation with up to 100% duty cycle. This eliminates forced switching during light loads, reducing supply current to 12μA and minimizing switching losses.
Its internal 24V-rated P-channel MOSFET (RDS(ON) = 2Ω typ at VIN = 6V) and integrated current-sense circuitry eliminate external sense resistors. Feedback is dual-mode: grounded FB enables preset 5.0V output (±4% tolerance), while external resistor divider enables adjustable output from 1.25V to VIN.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage (Preset) | 5.00V ±4% (4.80V–5.20V); factory-trimmed for stable 5V rail without external feedback components |
| Input Voltage Range | 4.5V to 24V; supports wide-input industrial and battery systems including 9V, 12V, and 24V rails |
| Max Output Current | 125mA continuous; limited by internal switch current limit (250–450mA) and thermal dissipation in SOT23 |
| Quiescent Current | 12μA typical at no load; enables multi-day battery life in always-on sensor nodes |
| Dropout Voltage | 120mV at 100mA load; achieved via 100% duty cycle, allowing VIN as low as 5.12V to sustain regulated 5V output |
| Shutdown Current | 3μA max; reduces system standby power when SHDN is pulled low |
| Switching Frequency | Variable (≈1–2 MHz typical); increases with load, eliminating fixed-frequency EMI peaks |
Pinout & Package
MAX1836EUT50#TG40 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 | Grounded to enable preset 5.0V output; connects to external resistor divider for adjustable output (1.25V–VIN) |
| 2 GND | Power and signal ground reference | Common return for internal circuitry, LX path, and EP pad; must be star-connected to minimize noise coupling |
| 3 IN | Main input voltage supply | Accepts 4.5V–24V; powers internal bias circuits and source of internal P-MOSFET; requires local 10µF ceramic input capacitor |
| 4 LX | Switch node connection | Drain of internal P-MOSFET; connects to inductor and catch diode anode; high dv/dt node requiring tight layout |
| 5 SHDN | Active-low shutdown control | Pulling low reduces supply current to 3μA; must not float; tied to IN for normal operation |
| 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 ultra-low dropout (120mV @100mA), extending usable battery voltage range down to ~5.12V for 5V output |
| 12μA no-load supply current | Reduces idle power in portable equipment; supports >1-year runtime on coin-cell batteries in intermittent-sensing applications |
| Internal 24V P-channel MOSFET | Eliminates external high-voltage switch; simplifies BOM and layout while supporting input up to 24V without level-shifting |
| Dual-mode feedback (FB) | Single-pin configuration for either preset 5V (FB=GND) or adjustable output (FB=divider), reducing design iterations |
| Thermal shutdown with 10°C hysteresis | Protects against sustained overload; auto-recovery prevents latch-up during transient overloads in enclosed enclosures |
Applications
| Handheld Medical Devices | Industrial Sensor Transmitters |
|---|---|
Use Scenario: Powering low-power microcontrollers and analog front-ends in portable blood glucose meters and pulse oximeters. IC Role / Device Role / Timing Role: Primary 5V supply rail generator from single 9V alkaline or Li-ion cell. Use Value: 12μA quiescent current extends battery life beyond 12 months; 100% duty cycle maintains regulation until battery drops to 5.12V. |
Use Scenario: Providing isolated 5V rail for 4–20mA loop-powered temperature/pressure transmitters. IC Role / Device Role / Timing Role: Local DC-DC conversion stage converting loop-derived 12–24V into stable 5V for signal conditioning ICs. Use Value: Input range up to 24V accommodates worst-case loop compliance; 3μA shutdown current minimizes error in precision current-loop calibration. |
| Backup Power Supplies | Low-Cost Notebook Peripherals |
Use Scenario: Generating auxiliary 5V rail from main system battery during primary regulator failure or brownout. IC Role / Device Role / Timing Role: Standby DC-DC converter activated only when main supply falls below UVLO threshold (3.55V). Use Value: 4.5V–24V input range allows direct connection to backup LiFePO₄ or supercapacitor banks; fast startup (<100µs) ensures seamless failover. |
Use Scenario: Powering USB-hub controller ICs and LED indicators in cost-sensitive laptop docking accessories. IC Role / Device Role / Timing Role: Secondary 5V regulator fed from 12V system rail, replacing linear regulators to reduce heat and improve efficiency. Use Value: >90% peak efficiency at 100mA reduces thermal load in plastic enclosures; SOT23 footprint saves PCB area vs. larger alternatives. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX1837EUT50-T | Same pinout and function, but rated for 250mA output (vs. 125mA); higher ILIM (500–900mA) and lower RDS(ON) (2Ω vs. 2Ω typ, but higher current capability) | Supports higher-current peripherals (e.g., USB 2.0 PHYs, multiple sensors); requires same layout but may need larger inductor for thermal margin | Select MAX1837EUT50-T if load exceeds 125mA or if future-proofing for higher current is required; identical SOT23 footprint enables drop-in upgrade |
| TPS62231DRYR | 3MHz fixed-frequency PWM (vs. variable-frequency current-limited); 300mA output; 2.05–6.0V input; different pinout (5-pin WSON) | Better EMI predictability due to fixed frequency; tighter output voltage accuracy (±1.5% vs. ±4%); requires PCB redesign | Choose TPS62231DRYR when EMI compliance is critical or when tighter VOUT tolerance is mandatory; not pin-compatible |
Compared with MAX1837EUT50-T, the MAX1836EUT50#TG40 offers lower cost and sufficient headroom for ≤125mA loads, while TPS62231DRYR trades variable-frequency efficiency for deterministic EMI behavior and higher accuracy - requiring layout revision but enabling stricter regulatory testing.
Availability
MAX1836EUT50#TG40 is available at Aetrix Electronics and suitable for handheld medical devices, industrial sensor transmitters, backup power supplies, and low-cost notebook peripherals requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX1836EUT50#TG40 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 product line was designed for compact, high-voltage step-down conversion in battery-powered and distributed power systems where ultra-low quiescent current and minimal dropout are essential.
FAQ
What is the output voltage tolerance of the MAX1836EUT50#TG40 in preset mode?
The MAX1836EUT50#TG40 delivers a factory-trimmed 5.00V output with ±4% tolerance (4.80V to 5.20V) across temperature (-40°C to +85°C) and load (0–125mA). This specification is guaranteed per the Electrical Characteristics table and applies when FB is grounded and OUT is connected to the regulated output node. The MAX1836EUT50#TG40 does not require external resistors to achieve this accuracy.
Can the MAX1836EUT50#TG40 operate with input voltage below 4.5V?
No - the MAX1836EUT50#TG40 has a specified minimum input voltage of 4.5V due to internal undervoltage lockout (UVLO) activation at 3.55V (rising) and 3.45V (falling). Operation below 4.5V risks failure to start or erratic regulation. For sub-4.5V inputs, consider alternatives like the MAX17503 or TPS62130, as the MAX1836EUT50#TG40 is not characterized or guaranteed for such conditions.
How does the MAX1836EUT50#TG40 achieve 100% duty cycle, and what is its practical benefit?
The MAX1836EUT50#TG40 achieves 100% duty cycle by holding its internal P-channel MOSFET fully on when the output approaches dropout, eliminating switching losses and minimizing voltage drop across RDS(ON). This yields a measured dropout voltage of 120mV at 100mA, meaning the MAX1836EUT50#TG40 sustains regulation down to VIN = 5.12V - critical for maximizing battery utilization in 5V systems.
Is the MAX1836EUT50#TG40 pin-compatible with the MAX1837EUT50-T?
Yes - the MAX1836EUT50#TG40 and MAX1837EUT50-T share identical 6-pin SOT23 pinout, electrical interface, and functional pin definitions (IN, GND, LX, SHDN, FB, OUT). They differ only in output current rating (125mA vs. 250mA) and internal current-limit threshold. The MAX1836EUT50#TG40 can be replaced with MAX1837EUT50-T without PCB changes if higher current capability is needed.
What is the recommended inductor value for the MAX1836EUT50#TG40 in a 5V-output application?
For the MAX1836EUT50#TG40 delivering 5V from 12V input, a 47µH inductor (e.g., Sumida CDRH5D28-470) is validated in the typical application circuit. Inductance values between 10µH and 100µH are supported; minimum inductance is calculated as LMIN = (VIN(MAX) − VOUT) × tON(MIN) / ILIM, yielding ~1.2µH. However, 47µH balances ripple, size, and peak-current overshoot - ensuring reliable operation of the MAX1836EUT50#TG40 across temperature and load.
MAX1836EUT50#TG40 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:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 24V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- 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-6
MAX1836EUT50#TG40 FAQ
1.How can I place an order for MAX1836EUT50#TG40 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1836EUT50#TG40 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 MAX1836EUT50#TG40 reliable?
The price and inventory of MAX1836EUT50#TG40 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1836EUT50#TG40 is usually 5 days.
3.What payment methods are accepted for MAX1836EUT50#TG40?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1836EUT50#TG40 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1836EUT50#TG40?
MAX1836EUT50#TG40 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1836EUT50#TG40 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 MAX1836EUT50#TG40?
For technical support, including MAX1836EUT50#TG40 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1836EUT50#TG40 requirements.
6.How does Aetrix verify that MAX1836EUT50#TG40 is sourced from the original manufacturer or authorized distributors?
All MAX1836EUT50#TG40 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 MAX1836EUT50#TG40 meets industry standards.
7.What is the process for return or replacement of MAX1836EUT50#TG40?
All MAX1836EUT50#TG40 units undergo pre-shipment inspection (PSI). If there is an issue with MAX1836EUT50#TG40, 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 MAX1836EUT50#TG40 part is unused and in its original packaging.
Return procedure for MAX1836EUT50#TG40:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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