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Analog Devices Inc./Maxim Integrated MAX4837ETT28BD3
- Part No.:
- MAX4837ETT28BD3
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 6-WDFN Exposed Pad
- Datasheet:
-
MAX4837ETT28BD3.pdf
- Description:
- 500MA, LDO LINEAR REGULATOR WITH
- Quantity:
- Payment:
- Shipping:
Inventory:263
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Product details
Overview
MAX4837ETT28BD3 from Maxim Integrated is a 500mA low-dropout linear regulator with integrated current-limiting switch and active-low RESET output, preset to 2.8V output, operating from 2.5V to 5.5V input, featuring 330mV dropout at full load, 90µA quiescent current, and reverse-current protection - used in USB port power management for fault-tolerant voltage regulation.
For engineers reviewing the MAX4837ETT28BD3 datasheet, MAX4837ETT28BD3 pinout, MAX4837ETT28BD3 application, or MAX4837ETT28BD3 equivalent, this page delivers verified technical context, exact pin functions, real-world use cases in portable electronics, and validated alternative parts with documented functional and timing differences.
Technical Context
The MAX4837ETT28BD3 implements a BiCMOS-based LDO architecture with internal 1.23V reference, error amplifier, and push-pull RESET driver. Its current-limit circuit guarantees 540–660mA trip threshold and latches current during overload without shutdown, while thermal protection activates at +165°C with 15°C hysteresis.
It integrates soft-start via external capacitor on SS pin (tSS = CSS in nF), provides 87.5% VOUT reset threshold (2.45V nominal for 2.8V output), and asserts RESET for ≥225ms (D3 timeout) after fault clearance. Shutdown discharge through 900Ω internal resistor ensures rapid OUT decay when SHDN is pulled low.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.8V ±2% over -40°C to +85°C - eliminates external feedback network and ensures stable core logic rail. |
| Load Current | Guaranteed 500mA continuous - supports high-current USB peripherals without derating at ambient temperature. |
| Dropout Voltage | 330mV at 500mA - enables operation down to VIN = 3.13V while maintaining regulated 2.8V output. |
| Quiescent Current | 90µA typical at full load - minimizes standby power loss in battery-powered systems. |
| RESET Timeout | 225ms (D3 option) - prevents spurious system resets during brief brownouts or transient load surges. |
| Shutdown Current | 0.1µA - reduces system-level leakage during deep sleep modes. |
| Reverse-Current Protection | ≤2µA reverse IN current when VOUT ≥ VIN - avoids backfeeding into upstream power sources. |
Pinout & Package
MAX4837ETT28BD3 uses a 6-pin TDFN package (3mm × 3mm, 0.8mm height) with exposed paddle internally connected to GND. The package provides low thermal resistance and requires EP soldered to PCB ground plane for reliable operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 IN | Regulator power input | Bypass with 0.1µF ceramic capacitor close to pin; accepts 2.5V–5.5V supply; UVLO triggers below 2.25V. |
| 2 GND | Ground reference | Common return for all internal circuits; must be low-impedance connection to system ground plane. |
| 3 SHDN | Active-low shutdown control | Pull ≤0.5V to disable regulator; draws only 0.1µA; releases latch and discharges OUT via 900Ω resistor. |
| 4 RESET | Active-low push-pull reset output | Asserts low when VOUT < 2.45V, VIN < 2.25V, SHDN low, or thermal shutdown - holds low for 225ms post-fault. |
| 5 SS | Soft-start timing control | Connect external capacitor (e.g., 0.1µF → 100ms tSS); floating = 1ms fixed rise time; prevents inrush current spikes. |
| 6 OUT | Regulated output | Delivers 2.8V/500mA; requires ≥3.3µF ceramic capacitor with ESR <0.2Ω for stability across temperature and load. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable soft-start | External capacitor on SS pin sets output ramp time (1ms to 150ms), eliminating false RESET assertions during startup. |
| Accurate current limit | 540–660mA trip range ensures consistent overcurrent protection across temperature without calibration. |
| Push-pull RESET output | Drives low actively (not open-drain), enabling direct interface with µC reset inputs without pull-up resistor. |
| Shutdown output discharge | 900Ω internal resistor pulls OUT to GND within milliseconds of SHDN assertion - critical for safe power sequencing. |
| Reverse-current protection | Blocks >99.9% reverse current flow from OUT to IN, preventing unintended charging of upstream supplies or batteries. |
Applications
| USB Port Power Management | SDIO Interface Regulation |
|---|---|
|
Use Scenario: Regulating power to USB 2.0 host ports in notebook computers where bus-powered peripherals draw variable current up to 500mA. IC Role / Device Role / Timing Role: LDO regulator with current-limiting switch and RESET signaling - monitors output integrity and notifies host controller of undervoltage or overload faults. Use Value: Prevents host system lockup by asserting RESET before VOUT drops below 2.45V, ensuring clean restart after transient faults. |
Use Scenario: Supplying stable 2.8V to SDIO card slots in PDAs and GPS systems where hot-plug events cause load transients. IC Role / Device Role / Timing Role: Fixed-output LDO with soft-start and reverse-current blocking - maintains rail integrity during card insertion/removal and isolates SDIO bus from main system supply. Use Value: Soft-start (configurable via SS pin) eliminates inrush-induced voltage droop that could corrupt SDIO initialization sequences. |
| Notebook System Rail Backup | Cell Phone Baseband Core Supply |
|
Use Scenario: Providing backup 2.8V rail to real-time clock or PMIC subsystems during main supply brownout in ultra-thin notebooks. IC Role / Device Role / Timing Role: Low-quiescent-current LDO with UVLO and RESET - detects input sag and signals host processor before VOUT collapses. Use Value: 225ms RESET timeout (D3) allows sufficient time for firmware to save state before power loss. |
Use Scenario: Delivering 2.8V to baseband processor cores in cellular handsets where dynamic load changes exceed 400mA/ms. IC Role / Device Role / Timing Role: High-PSRR LDO with thermal shutdown and current limiting - sustains regulation under burst loads while protecting against short-circuit faults. Use Value: 330mV dropout enables operation from single-cell Li-ion (3.0V min) while delivering full 500mA to processor cores. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator with RESET applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX4837EUT28BD3 | SOT23-6 package (same electrical specs); 1.45mm × 1.6mm footprint vs. TDFN's 3mm × 3mm; no exposed paddle. | Preferred for space-constrained layouts where thermal mass is less critical; lower power dissipation capability than TDFN. | Select MAX4837EUT28BD3 when board area is prioritized over thermal performance and peak current delivery. |
| MAX4835ETT28BD3 | 250mA rated version (vs. 500mA); identical pinout, RESET function, D3 timeout, and 2.8V output; shares same TDFN-6 package. | Used where load current never exceeds 250mA - reduces cost and simplifies thermal design but cannot support full USB 2.0 peripheral loads. | Choose MAX4835ETT28BD3 only if system maximum load is confirmed ≤250mA; not a drop-in replacement for 500mA requirements. |
Compared with MAX4837ETT28BD3, MAX4837EUT28BD3 trades thermal performance for smaller footprint, while MAX4835ETT28BD3 halves current capacity without altering pin compatibility - both require explicit validation of load and thermal margins in final design.
Availability
MAX4837ETT28BD3 is available at Aetrix Electronics and suitable for USB port power management, SDIO interface regulation, notebook system rail backup, and cell phone baseband core supply requiring stable component supply across industrial temperature range (-40°C to +85°C).
Supply support for MAX4837ETT28BD3 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) designs precision analog and mixed-signal ICs for power management, data conversion, and interface applications in industrial, computing, and communications markets.
The MAX4836/MAX4837 product line targets portable and battery-powered systems requiring fault-tolerant, low-quiescent-current LDOs with integrated protection and system-monitoring outputs like RESET.
FAQ
What is the exact output voltage tolerance of the MAX4837ETT28BD3 over temperature?
The MAX4837ETT28BD3 has a guaranteed output voltage accuracy of ±2% over the full -40°C to +85°C operating range. At +25°C, typical deviation is tighter, and normalized output voltage vs. temperature plots show drift within ±0.4% relative to +25°C value at full 500mA load - confirming stable 2.8V regulation across environmental stress.
Does the MAX4837ETT28BD3 support adjustable output voltage?
No, the MAX4837ETT28BD3 is a fixed-output device with factory-trimmed 2.8V regulation. It does not support external feedback resistors or voltage adjustment. For programmable versions, contact Maxim/Analog Devices directly - standard offerings include only preset voltages: 1.8V, 2.5V, 2.8V, 3.0V, and 3.3V.
How does the RESET timeout period D3 translate to actual timing in the MAX4837ETT28BD3?
The "D3" suffix in MAX4837ETT28BD3 specifies a 225ms RESET timeout period (min 150ms, max 300ms). After any fault condition clears - such as VOUT recovering above 2.45V - the RESET pin remains asserted low for the full D3 duration before deasserting high, ensuring robust system-level reset hold time.
Can the MAX4837ETT28BD3 be used without an external soft-start capacitor?
Yes, the MAX4837ETT28BD3 includes a fixed 1ms internal soft-start when the SS pin is left floating. This ensures controlled output ramp-up even without external components. Adding a capacitor (e.g., 0.01µF → 10ms, 0.1µF → 100ms) extends tSS to suppress inrush current further - critical for sensitive downstream logic.
What is the thermal performance difference between the TDFN and SOT23 packages for the MAX4837ETT28BD3?
The TDFN-6 package (used in MAX4837ETT28BD3) offers 1951.2mW continuous power dissipation at +70°C (derating 24.4mW/°C above), versus 727mW for SOT23-6. The exposed paddle thermally connects to PCB ground, reducing junction-to-board θJB significantly - enabling sustained 500mA operation in compact, thermally constrained layouts where SOT23 would overheat.
MAX4837ETT28BD3 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):
- 2.8V
- 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-EP (3x3)
MAX4837ETT28BD3 FAQ
1.How can I place an order for MAX4837ETT28BD3 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4837ETT28BD3 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 MAX4837ETT28BD3 reliable?
The price and inventory of MAX4837ETT28BD3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4837ETT28BD3 is usually 5 days.
3.What payment methods are accepted for MAX4837ETT28BD3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4837ETT28BD3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4837ETT28BD3?
MAX4837ETT28BD3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4837ETT28BD3 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 MAX4837ETT28BD3?
For technical support, including MAX4837ETT28BD3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4837ETT28BD3 requirements.
6.How does Aetrix verify that MAX4837ETT28BD3 is sourced from the original manufacturer or authorized distributors?
All MAX4837ETT28BD3 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 MAX4837ETT28BD3 meets industry standards.
7.What is the process for return or replacement of MAX4837ETT28BD3?
All MAX4837ETT28BD3 units undergo pre-shipment inspection (PSI). If there is an issue with MAX4837ETT28BD3, 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 MAX4837ETT28BD3 part is unused and in its original packaging.
Return procedure for MAX4837ETT28BD3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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