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Analog Devices Inc./Maxim Integrated MAX4834EUT30C
- Part No.:
- MAX4834EUT30C
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- -
- Datasheet:
-
MAX4834EUT30C.pdf
- Description:
- 250MA LDO LINEAR REGULATORS WITH
- Quantity:
- Payment:
- Shipping:
Inventory:1,694
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Product details
Overview
MAX4834EUT30C from Maxim Integrated is a 3.0V fixed-output, 250mA low-dropout linear regulator with integrated current-limiting switch and open-drain FLAG output for overcurrent detection. It operates from 2.5V to 5.5V input, features 90µA quiescent current, 165mV dropout at full load, and reverse-current protection. Designed for USB port power management in portable electronics.
For engineers reviewing the MAX4834EUT30C datasheet, MAX4834EUT30C pinout, MAX4834EUT30C application, or MAX4834EUT30C equivalent, key selection criteria include its 3.0V preset output, FLAG-based fault latching, soft-start programmability via external capacitor, and SOT23-6 package compatibility with space-constrained SDIO/USB power rails.
Technical Context
The MAX4834EUT30C implements a BiCMOS-based LDO architecture with an internal P-channel pass transistor, precision bandgap reference, and error amplifier. Its FLAG function asserts low after sustained overload exceeding 270–330mA for >5ms (blanking time), then latches off until IN or SHDN is cycled - enabling robust short-circuit protection without microcontroller intervention.
Soft-start is controlled by an external capacitor on the SS pin, yielding programmable rise times from 1ms (no cap) to 150ms (0.1µF); dropout voltage remains ≤165mV across –40°C to +85°C at 250mA load. Reverse-current protection ensures <0.1µA backfeed when VOUT > VIN.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.0V ±2% - stable rail for USB PHY or SDIO interface logic requiring precise 3.0V supply. |
| Max Load Current | 250mA guaranteed - sufficient for high-speed SDIO cards or dual-USB peripheral power switching. |
| Dropout Voltage | 165mV at 250mA - enables operation down to VIN = 3.165V, critical for battery-powered systems near end-of-discharge. |
| Quiescent Current | 90µA active / 0.1µA shutdown - extends battery life in always-on USB host ports or GPS receivers. |
| Current Limit | 270–330mA - protects downstream circuitry during cable shorts while allowing brief inrush peaks. |
| FLAG Blanking Time | 5–17ms - prevents false triggering during startup transients or capacitive load charging. |
| Input Voltage Range | 2.5V to 5.5V - supports single-cell Li-ion (3.0–4.2V) and 5V USB bus inputs without external regulation. |
Pinout & Package
MAX4834EUT30C is housed in a 6-pin SOT23-6 package (3.0mm × 1.7mm × 1.3mm) with GND-connected exposed pad not present in SOT23 variant. Pin 1 is IN; Pin 2 is GND; Pin 3 is SHDN; Pin 4 is FLAG (open-drain); 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 2.5–5.5V input; reverse-current protected. |
| 2 (GND) | Ground Reference | Common return for IN, OUT, SHDN, FLAG, and SS; no internal connection to EP (SOT23 has no exposed pad). |
| 3 (SHDN) | Active-Low Enable | Pull low to reduce IQ to 0.1µA; pull high or tie to IN for normal operation; toggling resets FLAG latch. |
| 4 (FLAG) | Overcurrent Indicator | Open-drain output pulled low during sustained overload (>blanking time); high-impedance otherwise; requires external pull-up. |
| 5 (SS) | Soft-Start Control | Connect external capacitor (0–0.1µF) to GND to program output ramp time from 1ms to 150ms. |
| 6 (OUT) | Regulated Output | 3.0V output; bypassed with ≥3.3µF ceramic capacitor (ESR <0.2Ω); supplies load up to 250mA. |
Key Features
| Feature | Design Value |
|---|---|
| Latched FLAG output | Asserts low and disables pass transistor on sustained overcurrent, requiring explicit reset via IN/SHDN toggle - eliminates need for external fault-handling logic. |
| Programmable soft-start | External CSS capacitor sets output rise time (1–150ms), preventing inrush current spikes that could brown-out shared input rails. |
| Reverse-current protection | Blocks >99.9% backfeed from OUT to IN when VOUT > VIN - critical for multi-rail systems where 3.0V domain may be powered before 5V input. |
| Ultra-low shutdown current | 0.1µA shutdown IQ enables >1-year battery standby in portable GPS or PDA applications with infrequent wake events. |
| Thermal shutdown with hysteresis | Shuts down at +165°C junction temperature and re-enables at +150°C - provides self-recovering protection during continuous overload without system-level intervention. |
Applications
| SDIO Power Management | USB Peripheral Port |
|---|---|
Use Scenario: Powering SDIO memory cards in notebook computers during hot-plug insertion and high-speed data transfer. IC Role / Device Role / Timing Role: Provides regulated 3.0V rail with current limiting and FLAG-based fault signaling to the host controller. Use Value: Prevents card damage during insertion shorts and enables firmware-triggered shutdown via FLAG assertion, reducing system-level fault recovery time. | Use Scenario: Supplying power to USB devices connected to a laptop's USB-A port with overcurrent detection. IC Role / Device Role / Timing Role: Acts as a smart USB power switch with latched overcurrent flag, replacing discrete MOSFET + comparator solutions. Use Value: Eliminates need for external current-sense resistor and comparator; FLAG signal directly interfaces with USB controller GPIO for immediate port disable. |
| Notebook System Rail | GPS Receiver Module |
Use Scenario: Delivering clean 3.0V to baseband processors or RF front-end ICs in ultra-thin notebooks with tight thermal constraints. IC Role / Device Role / Timing Role: Low-noise LDO with 70µVRMS output noise and PSRR >40dB at 1kHz, decoupling noisy DC-DC converters. Use Value: Maintains RF sensitivity by suppressing switching noise from main PMIC, verified across –40°C to +85°C operating range. | Use Scenario: Powering GPS baseband ICs in handheld navigation devices operating from single-cell Li-ion batteries. IC Role / Device Role / Timing Role: Supplies 3.0V at up to 250mA with 90µA quiescent current and 0.1µA shutdown mode during satellite acquisition sleep cycles. Use Value: Extends battery runtime by >30% versus standard LDOs, validated under real-world GPS duty-cycle profiles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO-with-fault-flag applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX4832EUT30C | 100mA rated output current; identical FLAG function, soft-start, and 3.0V output accuracy. | Lower current capacity limits use to low-power SDIO peripherals or single-chip GPS modules. | Select when load current stays below 100mA and board space allows same SOT23-6 footprint. |
| MAX4836EUT30C | 500mA output rating; same FLAG functionality but higher thermal dissipation requirement in SOT23-6 package. | Supports higher-current USB-C accessories or multi-lane SDIO devices; requires careful thermal layout. | Choose for future-proofing or designs expecting peak loads >250mA, accepting higher cost and thermal design effort. |
Compared with MAX4832EUT30C and MAX4836EUT30C, the MAX4834EUT30C delivers optimal balance of current capability (250mA), thermal performance in SOT23-6, and feature parity - making it the preferred choice for mainstream SDIO/USB power switches where 100mA is insufficient and 500mA introduces unnecessary thermal overhead.
Availability
MAX4834EUT30C is available at Aetrix Electronics and suitable for SDIO port power management, USB peripheral protection, and GPS receiver module supply applications requiring stable component supply, long-term lifecycle support, and guaranteed parametric compliance across –40°C to +85°C.
Supply support for MAX4834EUT30C 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 applications.
The MAX4834/MAX4835 product line was designed specifically for intelligent power-switching in portable electronics, integrating accurate current limiting, fault flagging, and ultra-low IQ into compact LDOs for SDIO, USB, and GPS subsystems.
FAQ
What is the output voltage tolerance of the MAX4834EUT30C over temperature and load?
The MAX4834EUT30C maintains ±2% output voltage accuracy across –40°C to +85°C ambient temperature and for load currents from 1mA to 250mA. This specification is guaranteed by design correlation and confirmed by 100% testing at +25°C, ensuring reliable 3.0V regulation in notebook and GPS applications where supply stability directly impacts signal integrity and timing margins.
How does the FLAG output of the MAX4834EUT30C behave during a short-circuit event?
During a sustained short-circuit, the MAX4834EUT30C's FLAG output goes low after the blanking time (5–17ms) and latches the pass transistor off. The device remains latched until IN or SHDN is cycled high-to-low-to-high. This behavior prevents thermal runaway and enables deterministic system-level fault recovery - unlike non-latching regulators that would continuously attempt to drive the short.
Can the MAX4834EUT30C be used with a 2.5V input supply?
Yes, the MAX4834EUT30C operates with input voltages as low as 2.5V, but at VIN = 2.5V, the 3.0V output cannot be sustained due to dropout requirements. Minimum functional VIN is VOUT + dropout = 3.0V + 0.165V = 3.165V. Below this, output regulation fails. Therefore, 2.5V input is only valid if the device is used in shutdown mode or as a pass-through switch with external regulation.
What capacitor value is required on the SS pin to achieve a 25ms soft-start time for the MAX4834EUT30C?
To achieve a 25ms soft-start time, connect a 25nF capacitor between the SS pin and GND. The soft-start time tSS (in ms) equals the CSS value in nF per the device's design equation. A 25nF capacitor yields tSS ≈ 25ms, providing controlled ramp-up to prevent inrush current from disturbing shared input rails in multi-rail portable systems using the MAX4834EUT30C.
Does the MAX4834EUT30C provide reverse-current protection, and how is it implemented?
Yes, the MAX4834EUT30C provides reverse-current protection: when VOUT exceeds VIN, the internal P-channel pass transistor turns off, limiting reverse current to <0.1µA (typical) and <2µA (max). This is achieved through intrinsic transistor behavior and biasing - no external components needed - ensuring safe operation in systems where backup supplies or hot-swap conditions could cause VOUT > VIN.
MAX4834EUT30C Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- -
- Voltage - Output (Min/Fixed):
- 3V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- -
- Current - Output:
- 250mA
- Current - Quiescent (Iq):
- -
- Current - Supply (Max):
- -
- PSRR:
- -
- Control Features:
- Enable, Reset, Soft Start
- Protection Features:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- -
MAX4834EUT30C FAQ
1.How can I place an order for MAX4834EUT30C through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4834EUT30C 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 MAX4834EUT30C reliable?
The price and inventory of MAX4834EUT30C are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4834EUT30C is usually 5 days.
3.What payment methods are accepted for MAX4834EUT30C?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4834EUT30C transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4834EUT30C?
MAX4834EUT30C orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4834EUT30C 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 MAX4834EUT30C?
For technical support, including MAX4834EUT30C datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4834EUT30C requirements.
6.How does Aetrix verify that MAX4834EUT30C is sourced from the original manufacturer or authorized distributors?
All MAX4834EUT30C 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 MAX4834EUT30C meets industry standards.
7.What is the process for return or replacement of MAX4834EUT30C?
All MAX4834EUT30C units undergo pre-shipment inspection (PSI). If there is an issue with MAX4834EUT30C, 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 MAX4834EUT30C part is unused and in its original packaging.
Return procedure for MAX4834EUT30C:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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