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Analog Devices Inc./Maxim Integrated MAX4835EUT33BD3-T
- Part No.:
- MAX4835EUT33BD3-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SOT-23-6
- Datasheet:
-
MAX4835EUT33BD3-T.pdf
- Description:
- IC REG LINEAR LDO 250MA
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
The MAX4835EUT33BD3-T from Maxim Integrated is a 3.3V, 250mA 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 165mV dropout at full load-designed for USB port power management in portable electronics.
For engineers reviewing the MAX4835EUT33BD3-T datasheet, MAX4835EUT33BD3-T pinout, MAX4835EUT33BD3-T application, or MAX4835EUT33BD3-T equivalent, key selection criteria include its 225ms RESET timeout (D3), 90µA quiescent current, shutdown discharge via internal 900Ω resistor, and SOT23-6 package compatibility with space-constrained SDIO/USB power rails.
Technical Context
The MAX4835EUT33BD3-T implements a BiCMOS-based LDO architecture with an internal P-channel pass transistor, precision bandgap reference, and error amplifier. Its RESET function asserts low when VOUT drops below 87.5% of nominal (2.888V), with fixed 225ms timeout after fault clearance.
Soft-start is externally programmable via capacitor on SS pin (tSS = CSS in nF), enabling controlled ramp-up; reverse-current protection actively disables the pass device when VOUT > VIN, limiting reverse leakage to ≤2µA. Thermal shutdown triggers at +165°C with 15°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.3V ±2% - stable rail for 3.3V logic, USB PHY, and SDIO interfaces |
| Max Load Current | 250mA - sufficient for dual USB peripheral ports or high-speed SD card operation |
| Dropout Voltage | 165mV at 250mA - enables regulation from 3.465V input, critical for battery-powered systems near EOL |
| Quiescent Current | 90µA - minimizes standby power loss in always-on USB host controllers |
| RESET Timeout | 225ms (D3 option) - prevents spurious resets during brief brownouts while ensuring reliable system recovery |
| Input Range | 2.5V to 5.5V - supports single-cell Li-ion (3.0–4.2V), USB 5V, and regulated 3.3V supply inputs |
| Shutdown Current | 0.1µA - enables ultra-low-power sleep modes in portable devices |
Pinout & Package
Package: 6-pin SOT23-6 (3.0mm × 1.7mm × 1.3mm), RoHS-compliant, exposed pad not present (SOT23 variant).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 IN | Power Input | Bypassed with 0.1µF ceramic capacitor; must be ≥2.5V for regulation, ≤5.5V absolute max |
| 2 GND | Ground Reference | Common return for all internal circuits; connects to PCB ground plane for thermal and noise control |
| 3 SHDN | Active-Low Enable | Pulled high (≥1.4V) for operation; pulled low (≤0.5V) disables regulator and activates OUT discharge |
| 4 RESET | Active-Low Reset Output | Push-pull driver; sinks 3.2mA at 0.4V low, sources 500µA at ≥0.8×VOUT high; asserts during UVLO, thermal shutdown, or VOUT < 2.888V |
| 5 SS | Soft-Start Control | Capacitor-to-ground sets startup ramp time (e.g., 0.1µF → 100ms); floating = 1ms default |
| 6 OUT | Regulated Output | Delivers 3.3V to load; requires ≥3.3µF ceramic capacitor with ESR <0.2Ω for stability |
Key Features
| Feature | Design Value |
|---|---|
| Programmable Soft-Start | Capacitor-controlled ramp eliminates inrush current and false RESET assertion during power-up |
| Reverse-Current Protection | Blocks backfeed from 3.3V output to lower-voltage input sources (e.g., dead battery), limiting reverse current to ≤2µA |
| Shutdown Output Discharge | Internal 900Ω resistor pulls OUT to GND in shutdown, preventing floating voltages that could bias downstream circuitry |
| Accurate Current Limit | 270–330mA limit protects against short-circuit faults without external sensing components |
| Thermal Shutdown with Hysteresis | +165°C trip / +150°C recovery prevents thermal oscillation during sustained overload conditions |
Applications
| USB Host Port Power | SDIO Card Interface |
|---|---|
Use Scenario: Powering USB 2.0 downstream ports in notebook computers or docking stations where host controller requires clean, sequenced 3.3V supply. IC Role / Device Role: Primary 3.3V LDO with RESET monitoring to halt enumeration if VBUS-derived rail sags during hot-plug events. Use Value: 225ms RESET timeout ensures robust response to transient dips without disrupting enumeration; 90µA IQ extends battery runtime in mobile hosts. | Use Scenario: Regulating power to SDHC/SDXC cards in GPS handhelds or industrial data loggers operating across wide temperature ranges. IC Role / Device Role: Dedicated 3.3V supply with reverse-current blocking to prevent card backfeed into main system rail during sleep mode. Use Value: Reverse-current protection eliminates need for external blocking diode; ±2% accuracy maintains SDIO timing margins per JEDEC spec. |
| Notebook System Rail | Cell Phone Baseband Core |
Use Scenario: Supplying 3.3V to USB transceivers, audio codecs, or display interface ICs in ultraportable notebooks with tight thermal constraints. IC Role / Device Role: Low-noise, thermally robust LDO with integrated RESET to coordinate power sequencing with embedded controller firmware. Use Value: 70µVRMS output noise (10Hz–100kHz) avoids coupling into sensitive analog blocks; TDFN/SOT23 footprint allows layout flexibility. | Use Scenario: Providing 3.3V core power to baseband processors in 3G/4G smartphones where rapid shutdown and fast wake-up are required. IC Role / Device Role: Always-on LDO with 0.1µA shutdown current and programmable soft-start to meet aggressive deep-sleep power budgets. Use Value: Shutdown discharge clears residual charge on decoupling caps, eliminating wake-up glitches; 165mV dropout extends usable battery range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX4835ETT33D3-T | TDFN-6 package (3mm × 3mm), same electrical specs, enhanced thermal performance (1951mW PD vs. 727mW) | Preferred for high-power-density designs requiring better heat dissipation in compact layouts | Select when board space permits larger footprint and thermal management is critical |
| MAX4836EUT33BD3-T | 500mA rated output, identical pinout and RESET functionality, higher dropout (200mV @ 500mA) | Suitable for future-proofing or higher-current loads like USB-C PD sink circuits | Choose only if load exceeds 250mA; otherwise, MAX4835EUT33BD3-T offers optimal efficiency and cost |
Compared with MAX4835ETT33D3-T, the MAX4835EUT33BD3-T trades thermal headroom for minimal PCB area; compared with MAX4836EUT33BD3-T, it delivers tighter regulation and lower IQ at half the current capability-ideal for cost- and size-sensitive 250mA applications.
Availability
MAX4835EUT33BD3-T is available at Aetrix Electronics and suitable for USB port power management, SDIO interface regulation, and notebook system rail applications requiring stable component supply, long-term lifecycle support, and guaranteed RoHS compliance.
Supply support for MAX4835EUT33BD3-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 semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, communications, and consumer markets.
The MAX4835EUT33BD3-T belongs to the MAX4834/MAX4835 family of current-limiting LDOs designed specifically for fault-tolerant power delivery in portable and embedded systems with strict size and quiescent current requirements.
FAQ
What is the exact RESET threshold voltage for the MAX4835EUT33BD3-T?
The MAX4835EUT33BD3-T asserts RESET when its 3.3V output falls below 87.5% of nominal, i.e., 2.888V. This threshold is factory-trimmed and guaranteed over -40°C to +85°C. The device holds RESET low for 225ms after the fault clears, as defined by the D3 suffix. This precise threshold ensures reliable detection of brownout conditions without nuisance triggering during normal load transients.
Does the MAX4835EUT33BD3-T provide reverse-current protection, and how does it behave?
Yes, the MAX4835EUT33BD3-T includes active reverse-current protection. When VOUT exceeds VIN (e.g., during battery swap or backup rail activation), the internal pass transistor turns off, limiting reverse current from OUT to IN to ≤2µA. This eliminates the need for an external blocking diode and prevents unintended charging of upstream sources-critical for systems with multiple power domains sharing a common 3.3V bus.
How is the soft-start time set on the MAX4835EUT33BD3-T, and what is the minimum value?
The soft-start time (tSS) of the MAX4835EUT33BD3-T is set by connecting a capacitor (CSS) from the SS pin to GND, with tSS ≈ CSS (in nF) in milliseconds. A 0.1µF capacitor yields ~100ms ramp time. If CSS is left unconnected (floating), the device defaults to a fixed 1ms soft-start. This programmability prevents inrush current spikes and ensures clean power-up sequencing for downstream USB or SDIO peripherals.
What is the shutdown behavior of the MAX4835EUT33BD3-T, particularly regarding output discharge?
When SHDN is pulled low, the MAX4835EUT33BD3-T disables its pass transistor and reference circuit, reducing quiescent current to 0.1µA. Crucially, it also activates an internal 900Ω discharge path from OUT to GND, pulling the output voltage to near-zero within milliseconds. This prevents floating outputs that could cause latch-up or undefined states in powered-down subsystems-essential for reliable system-level power gating.
Can the MAX4835EUT33BD3-T be used in place of the MAX4832 or MAX4833 series?
No-the MAX4835EUT33BD3-T is not a drop-in replacement for the MAX4832/MAX4833 (100mA variants). Though pin-compatible in SOT23-6, its 250mA current rating, higher dropout voltage under load, and different RESET timing options mean it may overdrive downstream capacitive loads or alter power-up timing. Use MAX4832EUT33BD3-T or MAX4833EUT33BD3-T only when 100mA capacity suffices and thermal margin is constrained.
MAX4835EUT33BD3-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-6
- 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):
- 0.165V @ 250mA
- Current - Output:
- 250mA
- 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:
- SOT-23-6
MAX4835EUT33BD3-T FAQ
1.How can I place an order for MAX4835EUT33BD3-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4835EUT33BD3-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 MAX4835EUT33BD3-T reliable?
The price and inventory of MAX4835EUT33BD3-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4835EUT33BD3-T is usually 5 days.
3.What payment methods are accepted for MAX4835EUT33BD3-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4835EUT33BD3-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4835EUT33BD3-T?
MAX4835EUT33BD3-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4835EUT33BD3-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 MAX4835EUT33BD3-T?
For technical support, including MAX4835EUT33BD3-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4835EUT33BD3-T requirements.
6.How does Aetrix verify that MAX4835EUT33BD3-T is sourced from the original manufacturer or authorized distributors?
All MAX4835EUT33BD3-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 MAX4835EUT33BD3-T meets industry standards.
7.What is the process for return or replacement of MAX4835EUT33BD3-T?
All MAX4835EUT33BD3-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX4835EUT33BD3-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 MAX4835EUT33BD3-T part is unused and in its original packaging.
Return procedure for MAX4835EUT33BD3-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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