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Analog Devices Inc./Maxim Integrated MAX4835ETT18BD2+
- Part No.:
- MAX4835ETT18BD2+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 6-WDFN Exposed Pad
- Datasheet:
-
MAX4835ETT18BD2+.pdf
- Description:
- IC REG LINEAR 250MA LDO
- Quantity:
- Payment:
- Shipping:
Inventory:2,021
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Product details
Overview
The MAX4835ETT18BD2+ from Maxim Integrated is a 250mA, 1.8V fixed-output LDO linear regulator with integrated push-pull RESET output, reverse-current protection, 90µA quiescent current, and programmable soft-start via external capacitor-designed for USB port power management in portable electronics.
For engineers reviewing the MAX4835ETT18BD2+ datasheet, MAX4835ETT18BD2+ pinout, MAX4835ETT18BD2+ application, or MAX4835ETT18BD2+ equivalent, key selection considerations include its 1.8V preset output, 30ms RESET timeout (D2 suffix), TDFN-6 package with exposed pad, shutdown discharge capability, and guaranteed operation across –40°C to +85°C.
Technical Context
The MAX4835ETT18BD2+ implements a BiCMOS-based LDO architecture with an internal P-channel pass transistor, precision bandgap reference, and error amplifier delivering ±2% output voltage accuracy over load (1mA–250mA) and temperature (–40°C to +85°C). Its RESET function asserts low when VOUT drops below 87.5% of nominal (1.575V), with a fixed 30ms timeout after fault clearance.
Soft-start is controlled by an external capacitor on the SS pin, enabling adjustable output ramp time (e.g., 10ms with 10nF); shutdown reduces quiescent current to 0.1µA while enabling internal 900Ω OUT-to-GND discharge. Reverse-current protection ensures IN leakage remains ≤2µA when VOUT ≥ VIN.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8V ±2% - stable supply for 1.8V logic rails without external feedback |
| Max Output Current | 250mA - sufficient for USB peripheral power, SDIO interfaces, and baseband processors |
| Input Voltage Range | 2.5V to 5.5V - compatible with single-cell Li-ion, USB 5V, and regulated 3.3V/5V system rails |
| Droput Voltage | 165mV at 250mA - enables regulation down to VIN = 1.965V, critical near battery end-of-life |
| Quiescent Current | 90µA active / 0.1µA shutdown - extends battery life in always-on or sleep-mode applications |
| RESET Timeout | 30ms (D2 suffix) - prevents false resets during brief load transients or brownouts |
| Soft-Start Control | Capacitor-programmable (SS pin) - eliminates inrush current and avoids false FLAG/RESET assertion at startup |
| Package | TDFN-6 (3mm × 3mm, 0.8mm height) with exposed thermal pad - supports high-power-density PCB layouts |
Pinout & Package
TDFN-6 package (3mm × 3mm, 0.8mm height) with exposed paddle internally connected to GND; requires external GND connection for thermal performance and EMI control.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN) | Power Input | Bypassed with 0.1µF ceramic capacitor; accepts 2.5V–5.5V input; UVLO triggers at 2.25V |
| 2 (GND) | Ground Reference | Primary return path; exposed paddle must be soldered to PCB GND plane for thermal dissipation |
| 3 (SHDN) | Active-Low Enable | Pulled low to enter 0.1µA shutdown; internal 900Ω pull-down ensures safe default OFF state |
| 4 (RESET) | Push-Pull Reset Output | Asserts low on VOUT < 1.575V, VIN < 2.25V, thermal shutdown, or SHDN low; holds low 30ms post-fault |
| 5 (SS) | Soft-Start Timing | Connect external capacitor (e.g., 10nF → 10ms ramp) to control output rise time and suppress inrush |
| 6 (OUT) | Regulated Output | Delivers 1.8V ±2%; requires ≥3.3µF ceramic cap (ESR < 0.2Ω) for stability and transient response |
Key Features
| Feature | Design Value |
|---|---|
| Integrated RESET with 30ms timeout | Ensures reliable microcontroller reset timing without external RC networks or timers |
| Shutdown output discharge | 900Ω internal resistor safely discharges 1.8V rail during shutdown-critical for sequencing-sensitive systems |
| Reverse-current protection | Blocks backfeed from OUT to IN (≤2µA leakage), preventing unintended power sourcing in multi-rail systems |
| Ultra-low 90µA quiescent current | Minimizes standby power loss in battery-powered devices such as GPS modules and PDAs |
| Thermal shutdown with 15°C hysteresis | Protects against sustained overload; auto-recovery enables fault-tolerant operation without system intervention |
| Accurate 250mA current limit | Guarantees short-circuit robustness without derating-enables direct replacement of discrete current-limiting solutions |
Applications
| USB Power Delivery | SDIO Interface Regulation |
|---|---|
Use Scenario: Powers USB OTG peripherals (e.g., flash drives, keyboards) from a 3.3V or 5V host rail while maintaining strict 1.8V I/O compliance. IC Role / Device Role / Timing Role: LDO regulator with RESET supervision ensures clean power-up and brownout detection for USB PHY logic. Use Value: Prevents enumeration failures by holding MCU in reset until 1.8V rail stabilizes and remains within ±2% for ≥30ms. | Use Scenario: Supplies 1.8V to SDIO card slots in smartphones and tablets where host controller requires tight voltage tolerance and fast transient response. IC Role / Device Role / Timing Role: Low-noise (70µVRMS), low-dropout regulator with soft-start eliminates SDIO initialization glitches during hot-plug events. Use Value: Enables reliable SD card detection and command execution by limiting output voltage deviation to <±2% under 100mA load steps. |
| Notebook Subsystem Rail | GPS Baseband Power |
Use Scenario: Generates 1.8V for Wi-Fi/BT combo chip I/O or display interface logic in ultrabooks with constrained thermal budgets. IC Role / Device Role / Timing Role: TDFN-6 package with exposed pad delivers 250mA at <165mV dropout while dissipating heat directly to PCB ground plane. Use Value: Eliminates need for heatsinking or airflow-supports fanless designs with continuous 250mA load at +85°C ambient. | Use Scenario: Powers GPS baseband processor core and RF front-end bias circuits in automotive telematics units operating from 12V battery via intermediate 3.3V rail. IC Role / Device Role / Timing Role: RESET output synchronizes GPS firmware boot sequence with valid 1.8V supply, preventing corrupted NVM writes during cold cranking. Use Value: Guarantees GPS lock acquisition within 2 seconds of ignition by asserting RESET only after 1.8V settles within ±2% for full 30ms timeout window. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO-with-RESET applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX4835EUT18BD2+ | SOT23-6 package (3.0mm × 1.7mm); no exposed thermal pad; 727mW max power dissipation vs. 1951mW for TDFN | Better suited for space-constrained layouts where thermal mass is limited; lower thermal performance limits continuous 250mA at high ambient | Select when board area is prioritized over thermal headroom and peak load duration is intermittent |
| MAX4836ETT18BD2+ | 500mA rated output; identical pinout, RESET function, and 1.8V output; higher dropout (200mV @ 500mA) | Supports higher-current peripherals (e.g., dual-band Wi-Fi modules) without redesign; requires larger input capacitance for stability | Choose when future-proofing for >250mA loads or when sharing layout with existing MAX4835 footprints |
Compared with MAX4835EUT18BD2+, the MAX4835ETT18BD2+ offers superior thermal performance in high-power-density designs, while MAX4836ETT18BD2+ provides headroom for current growth-both retain identical RESET timing, soft-start behavior, and shutdown discharge functionality.
Availability
The MAX4835ETT18BD2+ is available at Aetrix Electronics and suitable for USB ports, SDIO interfaces, and GPS baseband subsystems requiring stable component supply, RoHS-compliant packaging, and extended temperature support.
Supply support for MAX4835ETT18BD2+ 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.
The MAX4835ETT18BD2+ belongs to the MAX4834/MAX4835 family of current-limiting LDOs-engineered specifically for portable electronics requiring accurate reset supervision, ultra-low quiescent current, and robust short-circuit protection.
FAQ
What is the exact RESET threshold voltage for the MAX4835ETT18BD2+?
The MAX4835ETT18BD2+ asserts RESET when VOUT falls below 87.5% of its nominal output voltage. With a fixed 1.8V output, this threshold is precisely 1.575V (0.875 × 1.8V), guaranteed across –40°C to +85°C and load currents from 1mA to 250mA per the datasheet's Electrical Characteristics table.
Does the MAX4835ETT18BD2+ provide output discharge during shutdown?
Yes, the MAX4835ETT18BD2+ includes internal shutdown output discharge: when SHDN is pulled low, a 900Ω resistor connects OUT to GND, actively discharging the 1.8V rail. This feature is absent in the MAX4834 variant and is confirmed in the "Shutdown Discharge (MAX4835)" section of the datasheet.
What soft-start capacitor value yields a 30ms ramp time for the MAX4835ETT18BD2+?
Per the datasheet's soft-start equation tSS = CSS (ms) where CSS is in nF, a 30ms ramp time requires a 30nF capacitor between the SS pin and GND. This is validated in Figure MAX4834 toc10 (soft-start response with CSS = 0.1µF ≈ 100ms) and the "Soft-Start" subsection in Applications Information.
Is the MAX4835ETT18BD2+ pin-compatible with the MAX4832 series?
No-the MAX4835ETT18BD2+ is not pin-compatible with the MAX4832/MAX4833 (100mA variants). Although both families share functional similarity, the MAX4832 uses a different pinout: RESET is on pin 4 in MAX4835 but on pin 3 in MAX4832, and SHDN placement differs. The datasheet explicitly states "pin-compatible 100mA versions" refer to separate part numbers-not mechanical interchangeability.
What is the maximum allowable ESR for the output capacitor used with the MAX4835ETT18BD2+?
The MAX4835ETT18BD2+ requires an output capacitor with ESR less than 0.2Ω for stable operation across –40°C to +85°C and up to 250mA load. This specification is stated in the "Capacitor Selection and Regulator Stability" section and reinforced in the Pin Description for the OUT pin, where it notes "The capacitor's ESR should be less than 0.2Ω for stable operation."
MAX4835ETT18BD2+ 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):
- 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:
- 6-TDFN (3x3)
MAX4835ETT18BD2+ FAQ
1.How can I place an order for MAX4835ETT18BD2+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4835ETT18BD2+ 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 MAX4835ETT18BD2+ reliable?
The price and inventory of MAX4835ETT18BD2+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4835ETT18BD2+ is usually 5 days.
3.What payment methods are accepted for MAX4835ETT18BD2+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4835ETT18BD2+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4835ETT18BD2+?
MAX4835ETT18BD2+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4835ETT18BD2+ 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 MAX4835ETT18BD2+?
For technical support, including MAX4835ETT18BD2+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4835ETT18BD2+ requirements.
6.How does Aetrix verify that MAX4835ETT18BD2+ is sourced from the original manufacturer or authorized distributors?
All MAX4835ETT18BD2+ 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 MAX4835ETT18BD2+ meets industry standards.
7.What is the process for return or replacement of MAX4835ETT18BD2+?
All MAX4835ETT18BD2+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX4835ETT18BD2+, 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 MAX4835ETT18BD2+ part is unused and in its original packaging.
Return procedure for MAX4835ETT18BD2+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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