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Analog Devices Inc./Maxim Integrated MAX4835ETT33BD3
- Part No.:
- MAX4835ETT33BD3
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- -
- Datasheet:
-
MAX4835ETT33BD3.pdf
- Description:
- 250MA LDO LINEAR REGULATORS WITH
- Quantity:
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Inventory:448
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Product details
Overview
The MAX4835ETT33BD3 from Maxim Integrated is a 3.3V, 250mA low-dropout linear regulator with integrated current-limiting switch and active-low push-pull RESET output. It operates from 2.5V to 5.5V input, delivers ≤165mV dropout at full load, features 90µA quiescent current, reverse-current protection, and shutdown discharge via internal 900Ω resistor-designed for USB port power management in portable electronics.
For engineers reviewing the MAX4835ETT33BD3 datasheet, MAX4835ETT33BD3 pinout, MAX4835ETT33BD3 application, or MAX4835ETT33BD3 equivalent, key selection criteria include its 3.3V fixed output, D3 reset timeout (225ms), TDFN-6 package thermal performance, RESET assertion at 87.5% VOUT, and shutdown discharge capability-critical for reliable power sequencing in battery-powered systems.
Technical Context
The MAX4835ETT33BD3 integrates a PMOS pass transistor with accurate current limiting (270–330mA trip), thermal shutdown (+165°C), and undervoltage lockout (2.00–2.25V). Its RESET function asserts low on VOUT drop below 87.5% of nominal (2.8875V), VIN < VUVLO, SHDN low, thermal shutdown, or VOUT > VIN-and remains asserted for 225ms after fault clearance.
Soft-start is programmable via external capacitor on SS pin (tSS = CSS in nF), with minimum 1ms internal ramp. Shutdown reduces IQ to 0.1µA and discharges OUT through 900Ω; reverse-current protection limits IN leakage to ≤2µA when VOUT ≥ VIN.
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 3.3V logic without external feedback. |
| Max Load Current | 250mA guaranteed - supports moderate-power USB peripherals and baseband ICs without derating. |
| Dropout Voltage | 165mV at 250mA - enables operation down to VIN = 3.465V, critical for single-cell Li-ion or Li-poly backup. |
| Quiescent Current | 90µA typical at full load - minimizes standby power loss in always-on subsystems like USB detection circuits. |
| RESET Threshold | 0.875 × VOUT = 2.8875V - provides robust brown-out detection margin before system reset. |
| RESET Timeout | 225ms (D3 option) - holds reset long enough to ensure complete microcontroller initialization after recovery. |
| Shutdown Current | 0.1µA - enables ultra-low-power sleep modes in portable devices with no external discharge path needed. |
| Reverse Current | ≤2µA when VOUT ≥ VIN - prevents backfeed into input source during hot-swap or battery switchover. |
Pinout & Package
MAX4835ETT33BD3 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 thermal pad connection to ground plane for optimal junction temperature control.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN) | Input Power Supply | Bypassed with 0.1µF ceramic capacitor; accepts 2.5V–5.5V; UVLO triggers below 2.25V. |
| 2 (GND) | Ground Reference | Common return for all circuitry; exposed paddle must be soldered to PCB GND for thermal/EMI performance. |
| 3 (SHDN) | Active-Low Enable | Pulled low to disable regulator; VIH ≥1.4V, VIL ≤0.5V; drives OUT discharge resistor when low. |
| 4 (RESET) | Active-Low Reset Output | Push-pull output asserting low on VOUT drop, UVLO, thermal shutdown, or SHDN low; stays low 225ms post-fault. |
| 5 (SS) | Soft-Start Control | Capacitor-to-GND sets ramp time (tSS = CSS in nF); floating = 1ms min; prevents inrush current during power-up. |
| 6 (OUT) | Regulated Output | 3.3V supply rail; bypassed with ≥3.3µF ceramic cap (ESR <0.2Ω); internally discharged during shutdown. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated RESET with programmable timeout | D3 option provides 225ms assertion-ensures reliable MCU boot after voltage recovery without external timing components. |
| Shutdown-controlled OUT discharge | Internal 900Ω resistor pulls OUT to GND during SHDN low-eliminates need for external discharge FET in space-constrained designs. |
| Accurate current limit with thermal foldback | 270–330mA trip threshold and +165°C thermal shutdown prevent damage during sustained overload or short-circuit events. |
| Reverse-current blocking | Pass transistor disables when VOUT ≥ VIN-prevents backfeeding into input source during hot-plug or dual-supply transitions. |
| Ultra-low quiescent current | 90µA operating / 0.1µA shutdown-extends battery life in portable applications where LDO remains powered during sleep. |
| Adjustable soft-start | External capacitor on SS pin sets output ramp time (1ms to 150ms)-suppresses inrush current and avoids false resets during startup. |
Applications
| USB Host Port Power Management | SDIO Card Slot Regulation |
|---|---|
Use Scenario: Regulating and monitoring 3.3V power to USB peripheral ports in notebook computers or docking stations. IC Role / Device Role / Timing Role: LDO regulator with current-limiting switch and RESET signaling to host controller upon overcurrent or brown-out. Use Value: Prevents bus enumeration failure by asserting RESET during VOUT sag, while 250mA capacity supports USB 2.0 high-speed devices. | Use Scenario: Providing clean, sequenced 3.3V power to SDIO memory cards in PDAs and GPS handhelds. IC Role / Device Role / Timing Role: Fixed-output LDO with soft-start and RESET to coordinate card initialization and detect insertion faults. Use Value: 1ms minimum soft-start eliminates card reset glitches; 225ms RESET timeout ensures SD controller completes power-on reset sequence. |
| Cell Phone Baseband Core Supply | GPS Module Power Sequencing |
Use Scenario: Delivering tightly regulated 3.3V to baseband processors and RF transceivers in cellular handsets. IC Role / Device Role / Timing Role: Low-noise (70µVRMS), low-dropout regulator with reverse-current protection for shared battery rails. Use Value: 165mV dropout enables operation near end-of-battery; 90µA IQ extends talk time; reverse blocking isolates RF section during sleep mode. | Use Scenario: Powering GPS receiver modules requiring precise voltage stability and fault reporting during satellite acquisition. IC Role / Device Role / Timing Role: RESET-enabled LDO that signals host MCU when VOUT drops below 2.8875V due to antenna loading or low battery. Use Value: 87.5% VOUT threshold provides margin above GPS IC's minimum operating voltage; 225ms hold time prevents spurious reboots during signal search. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO-with-RESET applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX4835EUT33BD3 | SOT23-6 package (vs. TDFN-6); 727mW max power dissipation (vs. 1951mW); same electrical specs. | Lower thermal performance; suitable for lower ambient or intermittent load profiles. | Select for cost-sensitive, low-power designs where PCB area is less constrained than thermal budget. |
| MAX4836ETT33BD3 | 500mA rated output (vs. 250mA); identical pinout, RESET function, and package; higher dropout (200mV). | Supports higher-current peripherals; requires verification of thermal margin under full load. | Choose when future-proofing for higher load or when sharing layout with 500mA variants across product families. |
Compared with MAX4835EUT33BD3, the MAX4835ETT33BD3 offers superior thermal handling in compact layouts; versus MAX4836ETT33BD3, it trades current capacity for lower dropout and reduced thermal stress-making it optimal for thermally dense 3.3V USB/SDIO applications.
Availability
MAX4835ETT33BD3 is available at Aetrix Electronics and suitable for USB ports and devices, SDIO card slots, and GPS systems requiring stable component supply, consistent parametric performance, and long-term industrial availability.
Supply support for MAX4835ETT33BD3 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 communications applications.
The MAX4835ETT33BD3 belongs to Maxim's high-reliability LDO family targeting portable power management-engineered for accurate current limiting, robust RESET signaling, and ultra-low IQ in space-constrained battery-powered systems.
FAQ
What is the exact RESET threshold voltage for MAX4835ETT33BD3?
The MAX4835ETT33BD3 asserts RESET when its 3.3V output drops below 87.5% of nominal, i.e., 2.8875V. This threshold is guaranteed across temperature (-40°C to +85°C) and load (100µA to 250mA), with hysteresis preventing chatter during marginal conditions. The MAX4835ETT33BD3 maintains this specification without external components.
Does MAX4835ETT33BD3 provide output discharge during shutdown?
Yes, the MAX4835ETT33BD3 includes an internal 900Ω discharge resistor between OUT and GND activated when SHDN is pulled low. This feature ensures rapid, controlled discharge of the output capacitor without requiring external circuitry-critical for safe power-down sequencing in systems with multiple voltage domains. The MAX4835ETT33BD3 implements this function natively.
What is the soft-start behavior of MAX4835ETT33BD3 when no capacitor is connected to the SS pin?
When the SS pin of the MAX4835ETT33BD3 is left floating or unconnected, the device defaults to a minimum 1ms soft-start time. This internal ramp prevents inrush current spikes and false RESET assertions during power-up. Adding a capacitor (e.g., 0.1µF) extends tSS to ~100ms, but the MAX4835ETT33BD3 guarantees safe startup even with no external component.
How does MAX4835ETT33BD3 handle reverse current flow from OUT to IN?
The MAX4835ETT33BD3 incorporates reverse-current protection that disables the pass transistor when VOUT exceeds VIN, limiting reverse current to ≤2µA (typical) across temperature. This prevents backfeeding into the input source during hot-swap events or battery switchover-ensuring system-level power integrity without external diodes. The MAX4835ETT33BD3 achieves this via internal circuitry only.
What is the maximum continuous power dissipation for MAX4835ETT33BD3 in its TDFN package?
The MAX4835ETT33BD3 in the 6-pin TDFN package has a maximum continuous power dissipation of 1951.2mW at +70°C, derating by 24.4mW/°C above that temperature. This rating assumes proper PCB thermal design with the exposed paddle soldered to a GND plane. The MAX4835ETT33BD3 leverages this thermal capability to sustain 250mA loads in compact, high-density layouts.
MAX4835ETT33BD3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Output Configuration:
- -
- Output Type:
- -
- Number of Regulators:
- -
- Voltage - Input (Max):
- -
- Voltage - Output (Min/Fixed):
- -
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- -
- Current - Output:
- -
- Current - Quiescent (Iq):
- -
- Current - Supply (Max):
- -
- PSRR:
- -
- Control Features:
- -
- Protection Features:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
MAX4835ETT33BD3 FAQ
1.How can I place an order for MAX4835ETT33BD3 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4835ETT33BD3 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 MAX4835ETT33BD3 reliable?
The price and inventory of MAX4835ETT33BD3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4835ETT33BD3 is usually 5 days.
3.What payment methods are accepted for MAX4835ETT33BD3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4835ETT33BD3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4835ETT33BD3?
MAX4835ETT33BD3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4835ETT33BD3 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 MAX4835ETT33BD3?
For technical support, including MAX4835ETT33BD3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4835ETT33BD3 requirements.
6.How does Aetrix verify that MAX4835ETT33BD3 is sourced from the original manufacturer or authorized distributors?
All MAX4835ETT33BD3 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 MAX4835ETT33BD3 meets industry standards.
7.What is the process for return or replacement of MAX4835ETT33BD3?
All MAX4835ETT33BD3 units undergo pre-shipment inspection (PSI). If there is an issue with MAX4835ETT33BD3, 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 MAX4835ETT33BD3 part is unused and in its original packaging.
Return procedure for MAX4835ETT33BD3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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