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Analog Devices Inc./Maxim Integrated MAX4837EUT33BD3-T
- Part No.:
- MAX4837EUT33BD3-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 6-WDFN Exposed Pad
- Datasheet:
-
MAX4837EUT33BD3-T.pdf
- Description:
- IC REG LINEAR LDO 500MA
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
The MAX4837EUT33BD3-T from Maxim Integrated is a 500mA, 3.3V fixed-output low-dropout linear regulator with integrated current-limiting switch and active-low push-pull RESET output. It operates from 2.5V to 5.5V input, delivers ±2% output voltage accuracy over –40°C to +85°C, features 330mV dropout at full load, and includes shutdown discharge via internal 900Ω resistor. It is used in USB port power management where precise reset assertion and reverse-current protection are required.
For engineers reviewing the MAX4837EUT33BD3-T datasheet, MAX4837EUT33BD3-T pinout, MAX4837EUT33BD3-T application, or MAX4837EUT33BD3-T equivalent, key selection criteria include its 225ms RESET timeout (D3 suffix), 90µA quiescent current, thermal shutdown at +165°C, soft-start programmability via SS pin, and SOT23-6 package compatibility with space-constrained portable designs.
Technical Context
The MAX4837EUT33BD3-T implements a BiCMOS-based LDO architecture with an internal PMOS pass transistor, precision bandgap reference, and error amplifier. Its RESET function asserts low when VOUT drops below 87.5% of nominal (2.888V), after a 225ms timeout following fault clearance - a timing option selected by the "D3" suffix per Table 2.
It integrates reverse-current protection that limits IN leakage to ≤2µA when VOUT ≥ VIN, and shutdown discharge through a dedicated 900Ω path from OUT to GND. The soft-start circuit uses an external capacitor on the SS pin to control ramp time (tSS = CSS in nF), with a minimum 1ms internal soft-start enforced even with floating SS.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±2% over –40°C to +85°C; enables direct replacement for 3.3V logic rails without external feedback. |
| Load Current | Guaranteed 500mA continuous output; supports high-current peripherals like USB transceivers or SDIO controllers. |
| Dropout Voltage | 330mV at 500mA; allows operation with VIN as low as 3.63V while maintaining regulation - critical for battery-powered systems near end-of-life. |
| Quiescent Current | 90µA typical during regulation; minimizes standby power loss in always-on subsystems such as GPS receivers. |
| RESET Timeout | 225ms (D3 suffix); prevents spurious resets during brief line transients while ensuring reliable system recovery after sustained undervoltage. |
| Shutdown Current | 0.1µA max; enables ultra-low-power deep-sleep modes in portable devices without external discharge circuitry. |
| Reverse Current | ≤2µA when VOUT ≥ VIN; eliminates backfeed into input sources - essential for multi-rail systems with shared batteries or hot-swap capability. |
Pinout & Package
MAX4837EUT33BD3-T is housed in a 6-pin SOT23-6 package (JEDEC MO-178AA) with exposed pad internally connected to GND. Pin 1 is IN; Pin 2 is GND; Pin 3 is SHDN; Pin 4 is RESET; Pin 5 is SS; Pin 6 is OUT. The exposed paddle must be soldered to a GND plane for thermal performance and EMI reduction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN) | Input power supply | Bypassed with 0.1µF ceramic capacitor; must be ≥2.5V and ≤5.5V; powers internal regulator and bias circuits. |
| 2 (GND) | Ground reference | Common return for all internal circuits; connects to EP (exposed pad) - requires PCB thermal pad connection. |
| 3 (SHDN) | Active-low enable control | Pulled low to enter 0.1µA shutdown; pulled high or tied to IN for normal operation; VIH = 1.4V, VIL = 0.5V. |
| 4 (RESET) | Active-low reset output | Push-pull output asserting low during VOUT undervoltage, VIN UVLO, thermal shutdown, or SHDN assertion; remains low for 225ms post-fault. |
| 5 (SS) | Soft-start timing control | Capacitor-to-GND sets output ramp time (tSS = CSS in nF); floating SS yields 1ms default; prevents inrush current in sensitive loads. |
| 6 (OUT) | Regulated output | 3.3V output requiring ≥3.3µF ceramic capacitor (ESR < 0.2Ω); discharges via internal 900Ω resistor during shutdown. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable Soft-Start | External capacitor on SS pin sets rise time from 1ms (floating) to 150ms (0.1µF); eliminates false reset during startup sequencing. |
| RESET Output with Timeout | Push-pull RESET with factory-programmed 225ms timeout (D3 suffix); ensures deterministic recovery after brownout without external RC timing. |
| Shutdown Output Discharge | Internal 900Ω discharge path from OUT to GND during SHDN = low; removes need for external bleeder resistor in battery-critical applications. |
| Reverse-Current Protection | Blocks current flow from OUT to IN when VOUT > VIN; guarantees ≤2µA reverse leakage - critical for backup power and OR-ing configurations. |
| Thermal Shutdown with Hysteresis | Shuts down at +165°C junction temperature and re-enables at +150°C; prevents thermal runaway during sustained overload or poor heatsinking. |
Applications
| USB Port Power Management | SDIO Host Interface Regulation |
|---|---|
|
Use Scenario: Powering USB 2.0 transceivers and PHYs in notebook computers and docking stations. IC Role / Device Role / Timing Role: Primary 3.3V LDO with RESET signaling to host controller upon VBUS droop or overcurrent. Use Value: Prevents enumeration failure by asserting RESET before VOUT falls below USB specification thresholds (2.8V min), using 225ms timeout to tolerate brief cable insertion glitches. |
Use Scenario: Supplying regulated 3.3V to SDIO card slots in smartphones and tablets. IC Role / Device Role / Timing Role: Current-limited LDO with reverse-current blocking to isolate SDIO bus from main PMIC during card removal. Use Value: Eliminates backfeed into the SDIO controller during hot-plug events, while RESET notifies SoC of power instability before data corruption occurs. |
| Notebook System Rail Sequencing | GPS Module Power Supervision |
|
Use Scenario: Generating auxiliary 3.3V rail for embedded controllers and EC firmware during boot. IC Role / Device Role / Timing Role: Regulator with soft-start and RESET to coordinate power-up with main CPU VRM and BIOS initialization. Use Value: 1ms–150ms adjustable soft-start aligns VOUT ramp with other rails; RESET holds EC in reset until stable 3.3V is confirmed, preventing premature firmware execution. |
Use Scenario: Powering GPS baseband ICs and RF front-ends in automotive telematics units. IC Role / Device Role / Timing Role: Low-quiescent LDO with thermal protection and UVLO to maintain operation across wide battery voltage range (9V–16V). Use Value: 90µA IQ extends battery life in always-on tracking mode; RESET asserts within 35µs of VOUT drop, enabling fast GPS reacquisition after cold start. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO-with-RESET applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX4837ETT33BD3-T | TDFN-6 package (3mm × 3mm), higher thermal dissipation (1951mW vs. 727mW), same electrical specs. | Better suited for high-ambient or high-power-density layouts where SOT23 thermal limits are exceeded. | Select when board layout allows TDFN footprint and thermal performance is prioritized over cost or legacy compatibility. |
| MAX4834EUT33BD2-T | 250mA rated output, D2 (30ms) RESET timeout, identical SOT23-6 pinout and 3.3V output. | Lower current capacity and shorter reset hold-off; suitable for lower-power peripherals like I²C sensors or LED drivers. | Choose for cost-sensitive, low-load applications where 500mA headroom is unnecessary and faster reset recovery is acceptable. |
Compared with MAX4837EUT33BD3-T, the TDFN variant offers superior thermal handling in compact spaces, while the MAX4834EUT33BD2-T provides a pin-compatible downgrade for reduced current and faster reset response - both require no schematic changes but differ in load capability and fault-hold duration.
Availability
MAX4837EUT33BD3-T is available at Aetrix Electronics and suitable for USB port power management, SDIO interface regulation, and notebook system rail sequencing requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for MAX4837EUT33BD3-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 U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, computing, and communications markets.
The MAX4836/MAX4837 product line was designed specifically for portable and battery-powered applications demanding accurate current limiting, robust reset supervision, and ultra-low quiescent current in minimal footprint packages.
FAQ
What is the RESET timeout period for MAX4837EUT33BD3-T?
The MAX4837EUT33BD3-T has a factory-programmed RESET timeout of 225ms, indicated by the "D3" suffix per Maxim's Selector Guide. This duration begins after the fault condition (e.g., VOUT falling below 2.888V) clears and ensures the system remains held in reset long enough to stabilize before release. The timeout is implemented internally and requires no external components.
Does MAX4837EUT33BD3-T provide output discharge during shutdown?
Yes, MAX4837EUT33BD3-T includes internal shutdown output discharge via a 900Ω resistor between OUT and GND when SHDN is pulled low. This feature actively discharges the output capacitor, eliminating the need for external bleed resistors and ensuring rapid, controlled power-down in battery-sensitive applications.
What package type is used for MAX4837EUT33BD3-T?
MAX4837EUT33BD3-T uses the 6-pin SOT23-6 package (JEDEC MO-178AA), with pin 1 marked by a dot and the exposed thermal pad internally connected to GND. The package measures approximately 2.9mm × 2.8mm × 1.3mm and requires standard SMT reflow profiles compatible with lead-free assembly.
Can MAX4837EUT33BD3-T operate with input voltage below 3.3V?
Yes, MAX4837EUT33BD3-T supports input voltages from 2.5V to 5.5V. With a 330mV dropout at 500mA, it maintains regulation down to VIN = 3.63V under full load. At lighter loads, it can regulate with VIN as low as ~3.35V - making it suitable for single-cell Li-ion (3.0V–4.2V) or dual-cell NiMH inputs with appropriate margin.
How is soft-start configured on MAX4837EUT33BD3-T?
Soft-start on MAX4837EUT33BD3-T is configured by connecting a capacitor (CSS) from the SS pin (Pin 5) to GND. The soft-start time tSS equals the capacitor value in nanofarads (e.g., 10nF → 10ms). If SS is left floating, the device defaults to a 1ms internal soft-start - ensuring controlled output ramp even without external components.
MAX4837EUT33BD3-T 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):
- 3.3V
- 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)
MAX4837EUT33BD3-T FAQ
1.How can I place an order for MAX4837EUT33BD3-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4837EUT33BD3-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 MAX4837EUT33BD3-T reliable?
The price and inventory of MAX4837EUT33BD3-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4837EUT33BD3-T is usually 5 days.
3.What payment methods are accepted for MAX4837EUT33BD3-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4837EUT33BD3-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4837EUT33BD3-T?
MAX4837EUT33BD3-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4837EUT33BD3-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 MAX4837EUT33BD3-T?
For technical support, including MAX4837EUT33BD3-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4837EUT33BD3-T requirements.
6.How does Aetrix verify that MAX4837EUT33BD3-T is sourced from the original manufacturer or authorized distributors?
All MAX4837EUT33BD3-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 MAX4837EUT33BD3-T meets industry standards.
7.What is the process for return or replacement of MAX4837EUT33BD3-T?
All MAX4837EUT33BD3-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX4837EUT33BD3-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 MAX4837EUT33BD3-T part is unused and in its original packaging.
Return procedure for MAX4837EUT33BD3-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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