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Analog Devices Inc./Maxim Integrated MAX4837EUT18BD3
- Part No.:
- MAX4837EUT18BD3
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 6-WDFN Exposed Pad
- Datasheet:
-
MAX4837EUT18BD3.pdf
- Description:
- 500MA, LDO LINEAR REGULATOR WITH
- Quantity:
- Payment:
- Shipping:
Inventory:1,191
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Product details
Overview
MAX4837EUT18BD3 from Maxim Integrated is a 500mA low-dropout linear regulator with integrated current-limiting switch and active-low push-pull RESET output, delivering a fixed 1.8V output from 2.5V–5.5V input. It features 330mV dropout at full load, 90µA quiescent current, reverse-current protection, and 225ms RESET timeout (D3 option). It serves as a fault-aware power supply for USB/SDIO port power management in portable electronics.
For engineers reviewing the MAX4837EUT18BD3 datasheet, MAX4837EUT18BD3 pinout, MAX4837EUT18BD3 application, or MAX4837EUT18BD3 equivalent, key selection criteria include its 1.8V preset output, RESET assertion at 87.5% VOUT, shutdown discharge via internal 900Ω resistor, soft-start programmability, and thermal shutdown at +165°C - all validated for -40°C to +85°C operation in SOT23-6.
Technical Context
The MAX4837EUT18BD3 implements a BiCMOS-based LDO architecture with an internal P-channel pass transistor, precision bandgap reference, and error amplifier. Its RESET function monitors both VOUT drop below 1.575V (87.5% of 1.8V) and VIN undervoltage (<2.25V), asserting low for 225ms after fault clearance.
It integrates soft-start control via external capacitor on SS pin (tSS = CSS in nF), reverse-current blocking when VOUT > VIN, and shutdown discharge through a dedicated 900Ω path from OUT to GND - a feature absent in the FLAG-equipped MAX4836 variant.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8V ±2% over -40°C to +85°C; enables direct powering of 1.8V I/O rails without external feedback. |
| Load Current | Guaranteed 500mA continuous output; supports high-current peripherals like SDIO cards and USB transceivers. |
| Dropout Voltage | 330mV at 500mA; allows regulation from 2.13V input, critical for battery-powered systems near end-of-discharge. |
| Quiescent Current | 90µA typical during operation; minimizes standby power loss in always-on subsystems. |
| RESET Threshold | 0.875 × VOUT = 1.575V; ensures reliable system reset before logic-level violation in 1.8V domains. |
| RESET Timeout | 225ms (D3 suffix); prevents spurious resets during brief line transients while ensuring clean boot sequencing. |
| Shutdown Current | 0.1µA max; enables ultra-low-power deep-sleep states in portable devices. |
Pinout & Package
MAX4837EUT18BD3 is housed in a 6-pin SOT23-6 package (JEDEC MO-178AA), with exposed pad internally connected to GND for thermal enhancement. Pin 1 is IN; Pin 2 is GND; Pin 3 is SHDN; Pin 4 is RESET; Pin 5 is SS; Pin 6 is OUT.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - IN | Input power supply connection | Bypassed with 0.1µF ceramic capacitor; accepts 2.5V–5.5V; UVLO triggers below 2.25V. |
| 2 - GND | Ground reference | Common return for all internal circuits; exposed pad must be soldered to PCB ground plane. |
| 3 - SHDN | Active-low enable control | Pulled high to enable; pulled low to shut down regulator and activate OUT discharge path. |
| 4 - RESET | Active-low push-pull reset signal | Asserts low on VOUT drop, VIN UVLO, thermal shutdown, or SHDN low; holds low for 225ms post-fault. |
| 5 - SS | Soft-start timing control | Connect external capacitor to GND to set startup ramp time (e.g., 0.1µF → ~100ms). |
| 6 - OUT | Regulated output | Delivers 1.8V; requires ≥3.3µF ceramic capacitor with ESR <0.2Ω for stability and transient response. |
Key Features
| Feature | Design Value |
|---|---|
| Shutdown Output Discharge | Internal 900Ω resistor discharges OUT to GND during SHDN, preventing floating voltage on downstream circuitry. |
| Reverse-Current Protection | Blocks current flow from OUT to IN when VOUT > VIN, eliminating backfeed into source in multi-rail systems. |
| Adjustable Soft-Start | Programmable rise time (1ms minimum to 150ms typical) via SS pin capacitor, suppressing inrush current and false RESET assertions. |
| Accurate Current Limit | 540–660mA limit threshold; protects against short-circuit faults while sustaining full 500mA load under normal conditions. |
| Thermal Shutdown with Hysteresis | Shuts down at +165°C junction temperature and re-enables only after cooling by 15°C, preventing thermal oscillation. |
Applications
| USB Port Power Management | SDIO Card Power Control |
|---|---|
Use Scenario: Providing regulated 1.8V power to USB 2.0 transceivers and PHYs in notebook computers and docking stations. IC Role / Device Role / Timing Role: Primary LDO with RESET supervision; asserts reset if VOUT sags during hot-plug or cable insertion surge. Use Value: Prevents USB enumeration failure by holding host processor in reset until stable 1.8V rail is confirmed for 225ms. |
Use Scenario: Supplying power to SDIO-based Wi-Fi/BT modules in smartphones and PDAs during card initialization and data transfer. IC Role / Device Role / Timing Role: Fault-tolerant power source with current limiting; latches off only under sustained overload, not transient spikes. Use Value: Enables safe hot-swap operation: RESET notifies host of undervoltage events before SDIO command corruption occurs. |
| Notebook System Rail Monitoring | GPS Receiver Power Sequencing |
Use Scenario: Delivering 1.8V to baseband processor I/O banks in ultraportable notebooks where battery voltage dips near 2.5V. IC Role / Device Role / Timing Role: Low-quiescent LDO with UVLO and RESET; maintains regulation down to 2.13V input (1.8V + 330mV dropout). Use Value: Extends usable battery life by sustaining operation deeper into discharge cycle without triggering premature system reset. |
Use Scenario: Powering GPS RF front-end and baseband ICs requiring clean, glitch-free 1.8V during cold/warm starts. IC Role / Device Role / Timing Role: Sequenced power source with soft-start and RESET hold-off; eliminates false GPS lock failures from startup transients. Use Value: Ensures GPS firmware waits for valid 1.8V rail before attempting satellite acquisition, reducing time-to-fix by >300ms. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO-with-RESET applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX4837ETT18BD3 | TDFN-6 (3mm × 3mm) vs. SOT23-6; identical electrical specs and RESET timing; lower thermal resistance due to exposed pad. | Better suited for thermally constrained layouts or higher ambient temperatures (>70°C). | Select when board space permits TDFN and thermal performance is prioritized over legacy SOT23 footprint compatibility. |
| MAX4835EUT28BD2 | 250mA rated output; 2.8V fixed output; 30ms RESET timeout (D2); same pinout and package but lower current capability. | Applicable only where load current ≤250mA and 2.8V rail is required; not a functional replacement for 500mA/1.8V use cases. | Choose only for cost-sensitive, lower-current designs where 2.8V matches system requirements and 30ms reset suffices. |
Compared with MAX4837EUT18BD3, the TDFN variant offers superior thermal performance in compact layouts, while the MAX4835EUT28BD2 trades 500mA capacity and 1.8V output for lower cost and reduced current - neither is pin-compatible nor functionally interchangeable without redesign.
Availability
MAX4837EUT18BD3 is available at Aetrix Electronics and suitable for USB port power management, SDIO device regulation, and GPS receiver sequencing requiring stable component supply across industrial temperature ranges and long-lifecycle production programs.
Supply support for MAX4837EUT18BD3 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 demanding applications.
The MAX4837 belongs to Maxim's precision LDO family designed specifically for fault-resilient power delivery in portable and battery-operated systems with integrated supervision functions.
FAQ
What is the RESET timeout period for MAX4837EUT18BD3?
The "D3" suffix in MAX4837EUT18BD3 specifies a 225ms RESET timeout period. After any fault condition (e.g., VOUT drop below 1.575V) clears, the RESET pin remains asserted low for exactly 225ms before deasserting, ensuring robust system boot sequencing and immunity to momentary glitches. This value is factory-programmed and non-adjustable.
Does MAX4837EUT18BD3 provide output discharge during shutdown?
Yes, MAX4837EUT18BD3 includes dedicated shutdown output discharge functionality. When SHDN is pulled low, an internal 900Ω resistor connects OUT to GND, actively discharging the output capacitor. This prevents floating voltages on downstream circuitry and supports clean power-down sequences - a feature absent in the FLAG-version MAX4836.
What is the maximum input voltage rating for MAX4837EUT18BD3?
MAX4837EUT18BD3 has an absolute maximum input voltage rating of +6V relative to GND. However, its operational input range is specified from 2.5V to 5.5V. Operation above 5.5V risks permanent damage, and operation below 2.5V may cause dropout or UVLO activation - the device will not regulate properly below 2.25V input due to undervoltage lockout.
Can MAX4837EUT18BD3 be used with a 1.5V input supply?
No, MAX4837EUT18BD3 cannot regulate from a 1.5V input. Its minimum operating input voltage is 2.5V, and its dropout voltage is 330mV at 500mA. To deliver 1.8V output, it requires at least 2.13V input - but the UVLO threshold (2.25V) and guaranteed operation start at 2.5V. A 1.5V source falls outside both absolute and functional specifications.
What package type does MAX4837EUT18BD3 use, and is the exposed pad connected?
MAX4837EUT18BD3 uses the 6-pin SOT23-6 package (JEDEC MO-178AA), which does not include an exposed thermal pad. Unlike the TDFN variants (e.g., MAX4837ETT18BD3), the SOT23 version has no EP pin - thermal dissipation relies solely on leads and PCB copper. The pin 1 index marker is located at the top-left corner of the package outline.
MAX4837EUT18BD3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 6-WDFN Exposed Pad
- Packaging:
- Bulk
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.8V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.33V @ 500mA
- Current - Output:
- 500mA
- Current - Quiescent (Iq):
- 150 µA
- Current - Supply (Max):
- -
- PSRR:
- -
- Control Features:
- Enable, Reset, Soft Start
- Protection Features:
- Over Current, Over Temperature, Reverse Polarity
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-TDFN (3x3)
MAX4837EUT18BD3 FAQ
1.How can I place an order for MAX4837EUT18BD3 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4837EUT18BD3 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 MAX4837EUT18BD3 reliable?
The price and inventory of MAX4837EUT18BD3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4837EUT18BD3 is usually 5 days.
3.What payment methods are accepted for MAX4837EUT18BD3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4837EUT18BD3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4837EUT18BD3?
MAX4837EUT18BD3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4837EUT18BD3 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 MAX4837EUT18BD3?
For technical support, including MAX4837EUT18BD3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4837EUT18BD3 requirements.
6.How does Aetrix verify that MAX4837EUT18BD3 is sourced from the original manufacturer or authorized distributors?
All MAX4837EUT18BD3 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 MAX4837EUT18BD3 meets industry standards.
7.What is the process for return or replacement of MAX4837EUT18BD3?
All MAX4837EUT18BD3 units undergo pre-shipment inspection (PSI). If there is an issue with MAX4837EUT18BD3, 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 MAX4837EUT18BD3 part is unused and in its original packaging.
Return procedure for MAX4837EUT18BD3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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