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Analog Devices Inc./Maxim Integrated MAX4837ETT33BD3+
- Part No.:
- MAX4837ETT33BD3+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 6-WDFN Exposed Pad
- Datasheet:
-
MAX4837ETT33BD3+.pdf
- Description:
- IC REG LINEAR 3.3V 500MA 6TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,196
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Product details
Overview
MAX4837ETT33BD3+ from Maxim Integrated is a 500mA, 3.3V fixed-output low-dropout linear regulator with integrated push-pull RESET output, reverse-current protection, and programmable soft-start. It operates from 2.5V to 5.5V input, delivers ±2% output voltage accuracy over –40°C to +85°C, and features 90µA quiescent current - designed for USB port power management in portable electronics.
For engineers reviewing the MAX4837ETT33BD3+ datasheet, MAX4837ETT33BD3+ pinout, MAX4837ETT33BD3+ application, or MAX4837ETT33BD3+ equivalent, key selection criteria include its 225ms RESET timeout (D3 suffix), 330mV dropout at 500mA, shutdown discharge via 900Ω internal resistor, and TDFN-6 package thermal performance for space-constrained mobile designs.
Technical Context
The MAX4837ETT33BD3+ integrates a PMOS pass transistor with accurate current limiting (540–660mA trip range) and thermal shutdown (+165°C with 15°C hysteresis). Its RESET function asserts low when VOUT drops below 87.5% of nominal (2.888V), VIN falls below 2.25V UVLO threshold, SHDN is pulled low, or thermal shutdown activates.
Soft-start is externally programmable via capacitor on SS pin (tSS = CSS in nF), with default 1ms rise time if unconnected; the D3 suffix specifies 225ms RESET timeout after fault clearance. Reverse-current protection ensures <0.1µA IN leakage when VOUT ≥ VIN, and shutdown discharges OUT through a verified 900Ω internal path.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±2% over –40°C to +85°C - ensures stable core/peripheral rail for USB/SDIO devices without external feedback. |
| Load Current | Guaranteed 500mA continuous - supports high-current digital loads like SDIO controllers and GPS baseband ICs. |
| Dropout Voltage | 330mV at 500mA - enables operation down to VIN = 3.63V while maintaining regulation, critical for battery-powered systems near EOL. |
| Quiescent Current | 90µA typical at full load - minimizes standby power loss in always-on USB host ports and notebook standby rails. |
| RESET Timeout | 225ms (D3 option) - provides sufficient hold-off time to prevent false resets during transient brownouts or hot-plug events. |
| Shutdown Current | 0.1µA - reduces system-level leakage during deep sleep modes in cell phones and PDAs. |
| Reverse-Current Leakage | <2µA at VOUT = 5.5V, VIN = 0V - prevents backfeed into depleted batteries or shared input rails. |
Pinout & Package
MAX4837ETT33BD3+ uses a 6-pin TDFN package (3mm × 3mm × 0.8mm) with exposed paddle thermally and electrically connected to GND. The package supports high-power dissipation (1951.2mW at +70°C) and requires PCB GND connection to the EP for thermal integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 IN | Input Power Supply | Bypassed with 0.1µF ceramic capacitor; accepts 2.5V–5.5V input - must be routed with low-inductance path for transient immunity. |
| 2 GND | Ground Reference | Primary return for all internal circuits; connects to EP for thermal conduction - requires solid copper pour under EP. |
| 3 SHDN | Active-Low Enable | Pulled high to enable; VIH ≥1.4V, VIL ≤0.5V - controls startup sequencing and enables system-level power gating. |
| 4 RESET | Push-Pull Reset Output | Asserts low during faults (UVLO, VOUT drop, thermal shutdown); deasserts after 225ms timeout - directly interfaces µC reset inputs without pull-up. |
| 5 SS | Soft-Start Control | Capacitor-to-GND sets output ramp time (tSS = CSS in nF); floating = 1ms default - eliminates inrush current and false FLAG/RESET during power-up. |
| 6 OUT | Regulated Output | 3.3V supply rail; requires ≥3.3µF ceramic capacitor with ESR <0.2Ω - stabilizes loop and suppresses noise for sensitive RF/GPS circuitry. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated RESET with 225ms timeout | Ensures deterministic system recovery after brownout or overload without external timing components. |
| Shutdown output discharge (900Ω) | Drains OUT capacitance during SHDN assertion - prevents floating voltage on downstream logic during power-down sequences. |
| Reverse-current protection | Blocks >99.9% of backflow from OUT to IN - protects battery sources and avoids cross-regulator interference in multi-rail systems. |
| Accurate 500mA current limit | Trips between 540–660mA independent of temperature - enables robust short-circuit protection without derating for ambient extremes. |
| Ultra-low 90µA quiescent current | Maintains efficiency at light loads (e.g., USB suspend mode) without sacrificing transient response or PSRR. |
Applications
| USB Host Port Power Management | SDIO Card Interface Regulation |
|---|---|
|
Use Scenario: Powering USB 2.0 downstream ports in notebooks and docking stations with overcurrent detection and reset signaling. IC Role / Device Role / Timing Role: LDO regulator with integrated RESET output and current-limiting switch - provides clean 3.3V rail and fault signaling to host controller. Use Value: Eliminates need for discrete current-sense amplifier and reset supervisor; 225ms RESET timeout prevents spurious reboots during cable insertion transients. |
Use Scenario: Supplying regulated 3.3V to SDIO-based WiFi/BT modules in smartphones and tablets. IC Role / Device Role / Timing Role: Fixed-output LDO with soft-start and reverse-current blocking - ensures glitch-free card enumeration and prevents backfeed during hot removal. Use Value: Soft-start (programmable via SS pin) avoids SDIO bus contention; reverse-current protection isolates SDIO VCC from main system rail during card ejection. |
| Notebook System Standby Rail | GPS Receiver Power Sequencing |
|
Use Scenario: Generating always-on 3.3V standby power for real-time clock, keyboard controller, and wake logic in clamshell laptops. IC Role / Device Role / Timing Role: Low-IQ LDO with shutdown discharge - maintains low leakage in S3/S4 states and actively discharges rail on shutdown. Use Value: 0.1µA shutdown current extends battery life; 900Ω discharge path ensures rapid rail collapse for reliable firmware state retention. |
Use Scenario: Powering GPS baseband ICs requiring precise 3.3V with brownout immunity during satellite acquisition under weak battery conditions. IC Role / Device Role / Timing Role: High-accuracy LDO with UVLO and RESET - monitors input voltage sag and asserts reset before GPS data corruption occurs. Use Value: 2.25V UVLO threshold and 87.5% VOUT reset threshold provide margin above GPS IC minimum operating voltage; 225ms timeout accommodates cold-start acquisition delays. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX4837EUT33BD3+ | SOT23-6 package (vs. TDFN-6); same electrical specs, lower thermal dissipation (727mW vs. 1951mW) | Preferred for low-cost, low-power density layouts where PCB area is less constrained than thermal budget | Select when board space allows larger footprint and thermal design does not require exposed paddle cooling |
| MAX4835ETT33BD3+ | 250mA rated output (vs. 500mA); identical pinout, RESET functionality, and D3 timeout | Suitable for lower-current peripherals like legacy SD cards or low-power sensors where 500mA headroom is unnecessary | Choose to reduce BOM cost and power stage size when load current remains ≤250mA across all operating conditions |
Compared with MAX4837EUT33BD3+, the TDFN package offers 2.7× higher thermal power handling; compared with MAX4835ETT33BD3+, the 500mA rating supports modern high-speed SDIO and USB OTG loads without derating - making MAX4837ETT33BD3+ optimal for thermally dense, high-current portable designs.
Availability
MAX4837ETT33BD3+ is available at Aetrix Electronics and suitable for USB port power management, SDIO interface regulation, and GPS receiver power sequencing requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for MAX4837ETT33BD3+ 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, sensing, and communication applications - with emphasis on high-reliability, low-power solutions for portable and industrial systems.
The MAX4836/MAX4837 product line delivers integrated LDO regulators with current-limiting switches and system-monitoring outputs - engineered specifically for space-constrained, battery-powered devices requiring robust fault protection and minimal external components.
FAQ
What is the RESET timeout period for MAX4837ETT33BD3+?
The MAX4837ETT33BD3+ has a RESET timeout period of 225ms (D3 suffix), meaning the RESET output remains asserted low for 225ms after the fault condition (e.g., VOUT drop, UVLO, thermal shutdown) is cleared. This ensures downstream microcontrollers complete safe state recovery before resuming operation. The timeout is factory-programmed and non-adjustable.
Does MAX4837ETT33BD3+ provide output discharge during shutdown?
Yes, MAX4837ETT33BD3+ includes an internal 900Ω discharge path from OUT to GND during shutdown (SHDN = low), actively pulling the output voltage to ground. This prevents floating voltages on downstream logic and ensures predictable power-down behavior - a feature absent in the FLAG-version MAX4836 variants.
What is the maximum dropout voltage of MAX4837ETT33BD3+ at full load?
The maximum dropout voltage of MAX4837ETT33BD3+ is 330mV at 500mA load current and across the full –40°C to +85°C temperature range. This allows the device to maintain 3.3V regulation with input as low as 3.63V, extending usable battery life in single-cell Li-ion and Li-polymer applications.
Can MAX4837ETT33BD3+ be used with a 1.8V input supply?
No, MAX4837ETT33BD3+ requires a minimum input voltage of 2.5V per its specified operating range. At 1.8V input, the device will activate undervoltage lockout (UVLO threshold = 2.25V) and assert RESET, preventing regulation. It is incompatible with sub-2.5V sources such as partially discharged single-cell batteries or 1.8V system rails.
How is soft-start configured on MAX4837ETT33BD3+?
Soft-start on MAX4837ETT33BD3+ is configured by connecting a capacitor (CSS) from the SS pin to GND. The soft-start time tSS equals the capacitor value in nanofarads (e.g., 10nF → 10ms). If the SS pin is left floating, the device defaults to a 1ms soft-start time - ensuring controlled output ramp-up even without external components.
MAX4837ETT33BD3+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 6-WDFN Exposed Pad
- Packaging:
- Bulk
- Product Status:
- Obsolete
- 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-EP (3x3)
MAX4837ETT33BD3+ FAQ
1.How can I place an order for MAX4837ETT33BD3+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4837ETT33BD3+ 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 MAX4837ETT33BD3+ reliable?
The price and inventory of MAX4837ETT33BD3+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4837ETT33BD3+ is usually 5 days.
3.What payment methods are accepted for MAX4837ETT33BD3+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4837ETT33BD3+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4837ETT33BD3+?
MAX4837ETT33BD3+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4837ETT33BD3+ 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 MAX4837ETT33BD3+?
For technical support, including MAX4837ETT33BD3+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4837ETT33BD3+ requirements.
6.How does Aetrix verify that MAX4837ETT33BD3+ is sourced from the original manufacturer or authorized distributors?
All MAX4837ETT33BD3+ 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 MAX4837ETT33BD3+ meets industry standards.
7.What is the process for return or replacement of MAX4837ETT33BD3+?
All MAX4837ETT33BD3+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX4837ETT33BD3+, 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 MAX4837ETT33BD3+ part is unused and in its original packaging.
Return procedure for MAX4837ETT33BD3+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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