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Analog Devices Inc./Maxim Integrated MAX4835EUT18BD3
- Part No.:
- MAX4835EUT18BD3
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SOT-23-6
- Datasheet:
-
MAX4835EUT18BD3.pdf
- Description:
- 250MA LDO LINEAR REGULATORS WITH
- Quantity:
- Payment:
- Shipping:
Inventory:760
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Product details
Overview
The MAX4835EUT18BD3 from Maxim Integrated is a 250mA, 1.8V fixed-output LDO linear regulator with integrated push-pull RESET output, reverse-current protection, and shutdown-controlled OUT discharge. 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 - used in USB port power management for portable devices requiring reliable brownout detection.
For engineers reviewing the MAX4835EUT18BD3 datasheet, MAX4835EUT18BD3 pinout, MAX4835EUT18BD3 application, or MAX4835EUT18BD3 equivalent, key selection considerations include its 1.8V preset output, D3 reset timeout (225ms), SOT23-6 package, 165mV dropout at 250mA, and shutdown discharge via internal 900Ω resistor - all critical for low-power embedded power sequencing and fault reporting.
Technical Context
The MAX4835EUT18BD3 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 falls below 87.5% of nominal (1.575V), with programmable timeout (225ms) to reject transient glitches.
It integrates soft-start control via external capacitor on SS pin (tSS = CSS in nF), reverse-current blocking to limit IN leakage to <2µA when VOUT > VIN, and thermal shutdown at +165°C with 15°C hysteresis - enabling robust operation in thermally constrained portable designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8V ±2% - ensures stable core logic supply for 1.8V I/O domains without external feedback. |
| Max Output Current | 250mA - supports moderate-load applications like SDIO peripherals or USB PHY power rails. |
| Dropout Voltage | 165mV at 250mA - enables regulation from 1.965V input, critical for battery-powered systems near end-of-discharge. |
| Quiescent Current | 90µA - minimizes standby power loss in always-on subsystems such as GPS receivers or wake-on-USB circuits. |
| RESET Threshold | 0.875 × VOUT = 1.575V - provides precise undervoltage detection aligned to 1.8V rail tolerance. |
| RESET Timeout | 225ms (D3 option) - holds RESET active long enough to ensure full system reset while ignoring brief dips. |
| Shutdown Current | 0.1µA - enables ultra-low-power deep-sleep modes in handheld devices. |
| Input Voltage Range | 2.5V to 5.5V - compatible with single-cell Li-ion (3.0–4.2V), USB 5V, and regulated 3.3V supplies. |
Pinout & Package
MAX4835EUT18BD3 is housed in a 6-pin SOT23-6 package (3.0mm × 1.7mm × 1.3mm), with GND-connected exposed pad omitted in SOT23 variant. 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; must be ≥2.5V for regulation and ≥2.0V to avoid UVLO. |
| 2 - GND | Ground Reference | Common return for IN, OUT, SHDN, SS, and RESET; forms low-impedance path for noise rejection. |
| 3 - SHDN | Active-Low Enable | Pulled high to enable; pulled low to shut down regulator and activate 900Ω OUT discharge path. |
| 4 - RESET | Push-Pull Fault Indicator | Asserts low during VOUT undervoltage, VIN UVLO, thermal shutdown, or SHDN assertion; remains low for 225ms after fault clears. |
| 5 - SS | Soft-Start Control | Connects to GND via capacitor (e.g., 0.1µF → 100ms tSS) to limit inrush current during power-up. |
| 6 - OUT | Regulated Output | Supplies 1.8V load; requires ≥3.3µF ceramic capacitor with ESR <0.2Ω for stability across temperature and load. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated RESET with programmable timeout | 225ms (D3 suffix) - eliminates need for external RC timing network and improves reset reliability vs. discrete solutions. |
| Shutdown-controlled OUT discharge | Internal 900Ω resistor - safely discharges output capacitance during shutdown, preventing backfeeding into powered-down circuitry. |
| Reverse-current protection | IN leakage <2µA when VOUT > VIN - prevents battery drain in multi-rail systems where 1.8V domain may remain active while main supply is off. |
| Accurate current limiting | 270–330mA trip threshold - protects downstream loads and PCB traces without requiring external current-sense resistors. |
| Low-dropout operation | 165mV at full 250mA load - extends usable battery life by maintaining regulation deeper into discharge cycle. |
| Thermal shutdown with hysteresis | +165°C trip / +150°C recovery - prevents thermal runaway during sustained overload while allowing automatic recovery once cooled. |
Applications
| USB Host Port Power Management | SDIO Card Interface Supply |
|---|---|
Use Scenario: Powers USB 2.0 PHY and transceiver in notebook or tablet, with RESET signaling host controller during brownout. IC Role / Device Role / Timing Role: Primary 1.8V LDO with fault-reporting RESET output; coordinates power-good sequencing and system-level reset assertion. Use Value: Prevents data corruption during USB enumeration by holding RESET until VOUT stabilizes above 1.575V for ≥225ms post-startup. | Use Scenario: Supplies 1.8V I/O rail for SD memory cards in portable GPS units, where intermittent antenna-induced supply noise occurs. IC Role / Device Role / Timing Role: Regulator with glitch-immune RESET - detects sustained VOUT dip below 1.575V but ignores sub-54µs transients per datasheet immunity curve. Use Value: Avoids spurious card resets during RF bursts, improving SDIO link reliability without sacrificing fast fault response. |
| Cell Phone Baseband Core Supply | Low-Power PDA Application Processor Rail |
Use Scenario: Delivers clean 1.8V to baseband processor I/O in dual-voltage smartphones, synchronized with PMIC-controlled power sequencing. IC Role / Device Role / Timing Role: Standalone LDO with RESET output tied to processor's nRESET pin; enables hardware-initiated recovery from supply faults. Use Value: Guarantees 225ms minimum reset pulse width - satisfies ARM Cortex-A/M series minimum reset hold time requirements. | Use Scenario: Powers application processor subsystem in palmtop devices operating from single Li-ion cell (3.0–4.2V), requiring efficient conversion to 1.8V. IC Role / Device Role / Timing Role: Low-quiescent (90µA), low-dropout regulator with soft-start - controls inrush into large processor decoupling banks. Use Value: Limits peak startup current to <100mA using 0.01µF SS capacitor, preventing input rail collapse during boot. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO-with-RESET applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX4835ETT18D3-T | TDFN-6 package (3mm × 3mm), exposed pad connected to GND - lower thermal resistance (θJA ≈ 41°C/W vs. SOT23's 220°C/W). | Suitable for higher ambient temperature or continuous 250mA loads where board space allows larger footprint. | Select when thermal performance > board area constraints; same electrical behavior and pinout as MAX4835EUT18BD3. |
| MAX4836EUT18BD3-T | 500mA rated output current, identical 1.8V/RESET/D3 configuration - shares same pinout and feature set but higher drive capability. | Used where future-proofing for higher load or margin against aging/battery droop is required. | Choose if design may scale to >250mA loads; no layout change needed, but higher quiescent current (120µA vs. 90µA). |
Compared with MAX4835ETT18D3-T, the MAX4835EUT18BD3 offers smaller footprint and lower cost for thermally unconstrained applications; compared with MAX4836EUT18BD3-T, it trades current headroom for lower IQ and smaller size - making it optimal for space- and power-sensitive 1.8V portable subsystems.
Availability
MAX4835EUT18BD3 is available at Aetrix Electronics and suitable for USB ports, SDIO interfaces, and portable GPS systems requiring stable component supply, consistent parametric performance, and long-term production continuity.
Supply support for MAX4835EUT18BD3 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, mixed-signal, and power-management ICs for demanding industrial, automotive, and portable applications.
The MAX4834/MAX4835 product line targets compact, low-power systems needing accurate current-limited LDOs with integrated fault signaling - specifically engineered for USB, SDIO, and mobile peripheral power rails.
FAQ
What is the exact RESET timeout period for MAX4835EUT18BD3?
The MAX4835EUT18BD3 has a RESET timeout period of 225ms, indicated by the "D3" suffix in its part number. This duration begins after the RESET condition (e.g., VOUT falling below 1.575V) ends and ensures the RESET signal remains asserted long enough to guarantee full system initialization - matching typical microcontroller reset-hold requirements without external timing components.
Does MAX4835EUT18BD3 provide output discharge during shutdown?
Yes, the MAX4835EUT18BD3 includes internal shutdown output discharge via a 900Ω resistor between OUT and GND. When SHDN is pulled low, this path actively discharges the output capacitor, preventing backfeeding into powered-down circuitry - a key safety feature absent in the FLAG-version MAX4834 and essential for clean power sequencing in portable devices using MAX4835EUT18BD3.
What is the minimum input voltage required for MAX4835EUT18BD3 to regulate 1.8V output?
The MAX4835EUT18BD3 requires a minimum input voltage of 1.965V to maintain regulation at 1.8V output, based on its 165mV dropout voltage at 250mA. However, the device's input undervoltage lockout (UVLO) activates below 2.00V (rising), so stable operation begins only when VIN exceeds 2.25V - ensuring both dropout margin and UVLO release for reliable 1.8V rail generation in MAX4835EUT18BD3 designs.
Can MAX4835EUT18BD3 be used with a 0.1µF soft-start capacitor?
Yes, connecting a 0.1µF capacitor from SS to GND sets the soft-start time of MAX4835EUT18BD3 to approximately 100ms, as specified by tSS = CSS (in nF). This value effectively limits inrush current during startup, protecting upstream sources and reducing stress on input capacitors - a recommended practice for applications with large downstream capacitance, such as those using MAX4835EUT18BD3 to power processor I/O banks.
Is MAX4835EUT18BD3 pin-compatible with other members of the MAX483x family?
Yes, MAX4835EUT18BD3 is pin-compatible with all SOT23-6 variants in the MAX4834/MAX4835 family, including MAX4834EUT18C-T and MAX4835EUT25BD3-T. The pinout (IN, GND, SHDN, RESET/FLAG, SS, OUT) and package footprint are identical across voltage and feature variants - enabling drop-in replacement for design flexibility, though RESET/FLAG functionality and output voltage must be verified per application requirements when substituting MAX4835EUT18BD3.
MAX4835EUT18BD3 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):
- 1.8V
- 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
MAX4835EUT18BD3 FAQ
1.How can I place an order for MAX4835EUT18BD3 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4835EUT18BD3 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 MAX4835EUT18BD3 reliable?
The price and inventory of MAX4835EUT18BD3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4835EUT18BD3 is usually 5 days.
3.What payment methods are accepted for MAX4835EUT18BD3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4835EUT18BD3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4835EUT18BD3?
MAX4835EUT18BD3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4835EUT18BD3 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 MAX4835EUT18BD3?
For technical support, including MAX4835EUT18BD3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4835EUT18BD3 requirements.
6.How does Aetrix verify that MAX4835EUT18BD3 is sourced from the original manufacturer or authorized distributors?
All MAX4835EUT18BD3 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 MAX4835EUT18BD3 meets industry standards.
7.What is the process for return or replacement of MAX4835EUT18BD3?
All MAX4835EUT18BD3 units undergo pre-shipment inspection (PSI). If there is an issue with MAX4835EUT18BD3, 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 MAX4835EUT18BD3 part is unused and in its original packaging.
Return procedure for MAX4835EUT18BD3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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