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Analog Devices Inc./Maxim Integrated MAX4835EUT33BD3
- Part No.:
- MAX4835EUT33BD3
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SOT-23-6
- Datasheet:
-
MAX4835EUT33BD3.pdf
- Description:
- 250MA LDO LINEAR REGULATORS WITH
- Quantity:
- Payment:
- Shipping:
Inventory:307
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Product details
Overview
The MAX4835EUT33BD3 from Maxim Integrated is a 3.3V, 250mA low-dropout linear regulator with integrated push-pull RESET output, reverse-current protection, and shutdown discharge. It operates from 2.5V to 5.5V input, delivers ±2% output voltage accuracy over –40°C to +85°C, and features 150ms soft-start (CSS = 0.1µF) for controlled power-up in USB port power management.
For engineers reviewing the MAX4835EUT33BD3 datasheet, MAX4835EUT33BD3 pinout, MAX4835EUT33BD3 application, or MAX4835EUT33BD3 equivalent, key selection criteria include its 3.3V fixed output, D3 reset timeout (225ms), SOT23-6 package, 90µA quiescent current, and shutdown discharge capability - critical for battery-powered portable systems requiring reliable brownout detection and clean power sequencing.
Technical Context
The MAX4835EUT33BD3 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 (2.8875V), with a guaranteed 225ms timeout after fault clearance.
It integrates active reverse-current protection (IN current < 2µA when VOUT ≥ VIN), thermal shutdown at +165°C with 15°C hysteresis, and programmable soft-start via external capacitor on SS pin - enabling inrush control without external circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±2% over –40°C to +85°C; ensures stable core logic supply for 3.3V microcontrollers and peripherals. |
| Max Load Current | 250mA guaranteed; supports moderate-power USB peripherals and SDIO interfaces without derating. |
| Dropout Voltage | 165mV at 250mA; enables operation down to VIN = 3.465V, critical for single-cell Li-ion or 3.6V supply rails. |
| Quiescent Current | 90µA typical at full load; minimizes standby power loss in always-on system monitoring circuits. |
| RESET Threshold | 87.5% of VOUT (2.8875V); provides precise undervoltage detection margin before system reset. |
| RESET Timeout | 225ms (D3 option); prevents spurious resets during brief transients while ensuring reliable recovery timing. |
| Shutdown Current | 0.1µA; enables ultra-low-power sleep modes in portable devices with long battery life requirements. |
| Soft-Start Time | 100ms typical with 0.1µF CSS; eliminates false RESET assertion during startup by controlling VOUT ramp rate. |
Pinout & Package
MAX4835EUT33BD3 uses a 6-pin SOT23-6 package (3.0mm × 1.7mm × 1.3mm), with exposed pad internally connected to GND for thermal performance. 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 | Power Input | Bypassed with 0.1µF ceramic capacitor; accepts 2.5V–5.5V input; must be ≥ VOUT + dropout for regulation. |
| 2 - GND | Ground Reference | Common return for all internal circuits; connects to PCB ground plane; exposed pad tied to GND for thermal conduction. |
| 3 - SHDN | Active-Low Enable | Pulled high (≥1.4V) for operation; pulled low (<0.5V) for shutdown; drives internal pass transistor and reference off. |
| 4 - RESET | Push-Pull Reset Output | Asserts low during VOUT undervoltage, VIN UVLO, thermal shutdown, or SHDN low; holds low for 225ms post-fault. |
| 5 - SS | Soft-Start Control | Connects to GND via capacitor (e.g., 0.1µF → 100ms tSS); sets output rise time to prevent inrush and false RESET. |
| 6 - OUT | Regulated Output | Delivers 3.3V/250mA; requires ≥3.3µF ceramic capacitor (ESR < 0.2Ω) for stability and transient response. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated RESET with programmable timeout | Push-pull output with four factory-set durations (D1–D4); D3 = 225ms ensures robust immunity to short dips while guaranteeing timely system recovery. |
| Shutdown output discharge | 900Ω internal pull-down on OUT during SHDN; actively discharges output capacitance to prevent floating or back-powering downstream circuitry. |
| Reverse-current protection | Blocks >99.9% reverse current flow from OUT to IN; eliminates need for external blocking diode in backup-supply or hot-swap applications. |
| Accurate current limit | 270–330mA trip threshold; protects against sustained overload without latch-off (unlike FLAG variant), enabling safe short-circuit tolerance. |
| Low-noise regulation | 70µVRMS output noise (10Hz–100kHz); suitable for noise-sensitive analog sections and RF subsystems powered from same rail. |
| Thermal shutdown with hysteresis | +165°C trip / +150°C recovery; prevents thermal runaway under continuous overload while allowing self-recovery in intermittent fault conditions. |
Applications
| USB Host Port Power Management | SDIO Card Interface Supply |
|---|---|
Use Scenario: Regulating and monitoring 3.3V supply to USB peripheral ports in notebook computers or docking stations. IC Role / Device Role / Timing Role: Primary 3.3V LDO with RESET signaling undervoltage events to host controller during cable insertion/removal or load surges. Use Value: Prevents enumeration failures by asserting RESET only after 225ms of sustained VOUT dip - rejecting contact bounce and transient glitches. | Use Scenario: Providing stable 3.3V power to SDIO memory cards in GPS receivers and handheld PDAs. IC Role / Device Role / Timing Role: Fixed-output LDO with reverse-current protection ensures card removal does not backfeed into host power rail. Use Value: Eliminates need for external Schottky diode, reducing BOM count and PCB area while maintaining data integrity during hot-swap. |
| Cell Phone Baseband Core Supply | Portable Medical Sensor Module |
Use Scenario: Delivering clean 3.3V to baseband processors during RF transmission bursts that cause supply droop. IC Role / Device Role / Timing Role: Low-quiescent-current LDO with fast RESET response detects VOUT sag caused by PA current spikes. Use Value: 90µA IQ extends standby battery life; 225ms RESET timeout avoids false resets during normal TX duty cycles. | Use Scenario: Powering low-power analog front-end and MCU in wearable ECG or pulse oximeter modules. IC Role / Device Role / Timing Role: Shutdown-discharge LDO ensures rapid power-down and safe state retention when device enters sleep mode. Use Value: 0.1µA shutdown current enables multi-week battery operation; internal 900Ω discharge resistor clears OUT within milliseconds. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO-with-RESET applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX4835ETT33D3-T | Same electrical specs and RESET timeout, but in 3mm × 3mm TDFN-6 package with exposed thermal pad. | Superior thermal performance (1951mW dissipation vs. 727mW in SOT23); required for high-ambient or continuous 250mA loads. | Select when board layout allows larger footprint and thermal management is critical; not pin-compatible due to different pad layout. |
| MAX4836EUT33BD3-T | 500mA version with identical 3.3V output, D3 timeout, and SOT23-6 package; shares pinout and feature set. | Higher current headroom for future-proofing or peak-load scenarios; same RESET behavior and soft-start compatibility. | Drop-in replacement if design may scale to >250mA; verified pin-to-pin and functionally compatible per Maxim's ordering guide. |
Compared with MAX4835ETT33D3-T, the MAX4835EUT33BD3 offers smaller footprint and lower cost for thermally unconstrained designs; compared with MAX4836EUT33BD3-T, it trades current capacity for lower quiescent current and reduced thermal stress at 250mA - making it optimal for space- and power-constrained portable applications.
Availability
MAX4835EUT33BD3 is available at Aetrix Electronics and suitable for USB port power management, SDIO interface supplies, and portable medical sensor modules requiring stable component supply, consistent parametric performance, and long-term production continuity.
Supply support for MAX4835EUT33BD3 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, communications, and consumer applications.
The MAX4835 belongs to Maxim's precision LDO family designed specifically for portable and battery-powered systems where accurate voltage regulation, ultra-low IQ, and intelligent fault signaling (RESET) are essential for system reliability.
FAQ
What is the exact RESET timeout period for MAX4835EUT33BD3?
The MAX4835EUT33BD3 has a D3 reset timeout period of 225ms. This value is factory-programmed and specified in the Electrical Characteristics table: tRESET = 150ms (min), 225ms (typ), 300ms (max). The timeout begins after the reset condition (e.g., VOUT falling below 2.8875V) is cleared and ensures the system remains held in reset long enough to stabilize before release.
Does MAX4835EUT33BD3 provide output discharge during shutdown?
Yes, MAX4835EUT33BD3 includes internal shutdown output discharge via a 900Ω resistor from OUT to GND. When SHDN is pulled low, this path actively discharges external output capacitance, preventing residual voltage from back-powering downstream circuitry or causing undefined logic states - a key feature distinguishing it from the FLAG-version MAX4834.
What is the minimum input voltage required for MAX4835EUT33BD3 to regulate 3.3V output?
The minimum input voltage for regulation is determined by dropout voltage: VIN(min) = VOUT + VDO. At 250mA load and –40°C to +85°C, VDO is 165mV max. Thus, VIN must be ≥ 3.465V to maintain 3.3V regulation. Below this, the device enters dropout and VOUT tracks VIN minus VDO.
Can MAX4835EUT33BD3 be used with a 2.5V input supply?
No - MAX4835EUT33BD3 requires VIN ≥ 2.5V minimum per Absolute Maximum Ratings, but cannot regulate 3.3V output from 2.5V input due to dropout constraints. With 2.5V input, VOUT will be ≤ 2.5V – 165mV = 2.335V (in dropout), failing to meet 3.3V specification. Use only with VIN ≥ 3.465V for full regulation.
Is MAX4835EUT33BD3 RoHS-compliant and lead-free?
Per Maxim's official part number table, MAX4835EUT33BD3-T carries no "+" (RoHS/lead-free) or "#" (RoHS/lead-exempt) suffix, indicating it is not RoHS-compliant in its standard configuration. For lead-free versions, consult Maxim's latest packaging documentation or contact Aetrix Electronics for qualified alternatives meeting current environmental compliance requirements.
MAX4835EUT33BD3 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 FAQ
1.How can I place an order for MAX4835EUT33BD3 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4835EUT33BD3 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 reliable?
The price and inventory of MAX4835EUT33BD3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4835EUT33BD3 is usually 5 days.
3.What payment methods are accepted for MAX4835EUT33BD3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4835EUT33BD3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4835EUT33BD3?
MAX4835EUT33BD3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4835EUT33BD3 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?
For technical support, including MAX4835EUT33BD3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4835EUT33BD3 requirements.
6.How does Aetrix verify that MAX4835EUT33BD3 is sourced from the original manufacturer or authorized distributors?
All MAX4835EUT33BD3 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 meets industry standards.
7.What is the process for return or replacement of MAX4835EUT33BD3?
All MAX4835EUT33BD3 units undergo pre-shipment inspection (PSI). If there is an issue with MAX4835EUT33BD3, 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 part is unused and in its original packaging.
Return procedure for MAX4835EUT33BD3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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