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Analog Devices Inc./Maxim Integrated MAX4834ETT28C
- Part No.:
- MAX4834ETT28C
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 6-WDFN Exposed Pad
- Datasheet:
-
MAX4834ETT28C.pdf
- Description:
- IC REG LINEAR 250MA LDO
- Quantity:
- Payment:
- Shipping:
Inventory:1,209
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Product details
Overview
MAX4834ETT28C from Maxim Integrated is a 250mA, 2.8V fixed-output low-dropout (LDO) linear regulator with integrated current-limiting switch and open-drain FLAG output. It operates from 2.5V to 5.5V input, delivers ±2% output voltage accuracy over –40°C to +85°C, features 165mV dropout at full load, and provides reverse-current protection and thermal shutdown. It is used in USB port power management where overcurrent detection and system-level fault signaling are required.
For engineers reviewing the MAX4834ETT28C datasheet, MAX4834ETT28C pinout, MAX4834ETT28C application, or MAX4834ETT28C equivalent, key selection criteria include its 250mA guaranteed load current, 90µA quiescent current, programmable soft-start via external capacitor, FLAG assertion timing after blanking period, and TDFN-6 package thermal performance for space-constrained portable designs.
Technical Context
The MAX4834ETT28C integrates a precision current-limit circuit that latches off the pass transistor when load current exceeds 270–330mA for longer than the blanking time (5–17ms), asserting the open-drain FLAG output low. Its internal 1.23V reference and error amplifier regulate output to 2.8V with ±2% accuracy across temperature and load.
Soft-start is controlled by an external capacitor on the SS pin, enabling adjustable output ramp time (1ms minimum internal, up to 150ms with 0.1µF); shutdown reduces quiescent current to 0.1µA while discharging OUT through internal logic-though discharge is not implemented in the MAX4834 variant (only MAX4835).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.8V ±2% over –40°C to +85°C; ensures stable core/peripheral rail for USB/SDIO devices without external feedback. |
| Max Load Current | 250mA guaranteed minimum; supports high-pulse-current USB peripherals without dropout or thermal shutdown under normal operation. |
| Dropout Voltage | 165mV at 250mA; enables regulation from 2.965V input, critical for battery-powered systems near end-of-discharge. |
| Quiescent Current | 90µA typical at no load; minimizes standby power loss in always-on USB host ports and GPS receivers. |
| FLAG Blanking Time | 5–17ms; prevents false overcurrent flagging during startup inrush or transient load spikes. |
| Input Voltage Range | 2.5V to 5.5V; compatible with single-cell Li-ion (3.0–4.2V), USB 5V, and regulated 3.3V/2.5V supplies. |
| Shutdown Current | 0.1µA maximum; enables ultra-low-power sleep modes in notebook and PDA applications. |
Pinout & Package
MAX4834ETT28C is housed in a 3mm × 3mm, 0.8mm-thick TDFN-6 package with exposed paddle (EP) internally connected to GND. The EP must be externally soldered to a PCB ground plane for optimal thermal dissipation (derating: 24.4mW/°C above +70°C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 IN | Power Input | Bypass with 0.1µF ceramic capacitor; supports 2.5–5.5V input; reverse-current protection disables conduction if VOUT > VIN. |
| 2 GND | Ground Reference | Primary return path for regulator, control circuitry, and FLAG output; connects to EP for thermal conduction. |
| 3 SHDN | Active-Low Enable | Pull low to enter 0.1µA shutdown; pull high or tie to IN for normal operation; hysteresis of 30mV prevents chatter. |
| 4 FLAG | Open-Drain Fault Indicator | Asserts low when sustained overcurrent (>270mA) exceeds blanking time; requires external pull-up for logic-level interface. |
| 5 SS | Soft-Start Control | Connect external capacitor (e.g., 0.01µF → 10ms ramp); floating = 1ms default; eliminates inrush-induced reset glitches. |
| 6 OUT | Regulated Output | Delivers 2.8V ±2%; bypass with ≥3.3µF ceramic cap (ESR < 0.2Ω); stable with purely resistive loads up to 250mA. |
Key Features
| Feature | Design Value |
|---|---|
| Accurate current limiting | 270–330mA threshold with latch-off behavior ensures robust short-circuit protection without external sensing. |
| Reverse-current protection | Guarantees <2µA reverse current when VOUT ≥ VIN, preventing backfeed into shared input rails in multi-rail systems. |
| Thermal shutdown | +165°C trip with 15°C hysteresis enables safe pulsed operation during continuous overload, avoiding permanent damage. |
| Ultra-low quiescent current | 90µA operating / 0.1µA shutdown enables >1-year battery life in GPS trackers and always-on SDIO card slots. |
| Preset 2.8V output | Eliminates external resistor divider, reducing BOM count and layout area while ensuring ±2% accuracy across temp/load. |
Applications
| USB Host Port Protection | SDIO Card Power Management |
|---|---|
|
Use Scenario: Powering USB peripherals (e.g., flash drives, HID devices) from a portable host with limited current budget. IC Role / Device Role / Timing Role: LDO regulator with current-limiting switch and FLAG output for real-time overcurrent detection and system-level fault reporting. Use Value: Prevents bus voltage collapse and host controller reset by latching off on sustained >270mA draw, enabling graceful firmware recovery. |
Use Scenario: Supplying regulated 2.8V to SDIO-based Wi-Fi or Bluetooth modules in notebooks and tablets. IC Role / Device Role / Timing Role: Fixed-output LDO with programmable soft-start to avoid SDIO initialization failures caused by fast VCC rise. Use Value: 10ms soft-start (with 0.01µF SS cap) aligns with SDIO spec tRST requirements, eliminating command timeout errors during hot-plug. |
| Notebook Subsystem Rail | GPS Receiver Core Supply |
|
Use Scenario: Providing clean, low-noise 2.8V supply to baseband processors or audio codecs in ultraportable notebooks. IC Role / Device Role / Timing Role: Low-PSRR LDO (–40dB @ 10kHz) with 70µVRMS noise (10Hz–100kHz) for analog-sensitive subsystems. Use Value: 90µA IQ and 0.1µA shutdown extend battery runtime during suspend-to-RAM states without compromising signal integrity. |
Use Scenario: Powering GPS RF front-end and baseband ICs requiring stable 2.8V under varying battery voltage (3.3–4.2V). IC Role / Device Role / Timing Role: High PSRR LDO (–60dB @ 1kHz) with 165mV dropout enabling operation down to 2.965V input. Use Value: Maintains lock during weak-signal acquisition even as Li-ion voltage drops below 3.0V, extending usable battery range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator with overcurrent flag applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX4832EUT28C-T | 100mA rated output current; identical FLAG function, soft-start, and 2.8V preset; same SOT23-6 footprint. | Suitable only for lower-current SDIO peripherals or GPS backup rails; insufficient for USB 2.0 high-power devices. | Select when load never exceeds 100mA and board space favors SOT23 over TDFN. |
| MAX4836ETT28C-T | 500mA rated output; same 2.8V preset, FLAG, and TDFN-6 package; higher thermal dissipation capability. | Supports higher-current USB OTG or dual-SIM cellular modules; requires verification of PCB copper area for 500mA thermal handling. | Choose when future-proofing for higher loads or when operating ambient exceeds +70°C with sustained 250mA draw. |
Compared with MAX4834ETT28C, MAX4832EUT28C offers pin-compatible downsizing for cost-sensitive 100mA applications, while MAX4836ETT28C provides headroom for thermally demanding 500mA use cases-both retain identical FLAG timing, soft-start control, and 2.8V regulation accuracy.
Availability
MAX4834ETT28C is available at Aetrix Electronics and suitable for USB port protection, SDIO device power management, and notebook subsystem rail applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for MAX4834ETT28C 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 industrial, computing, and portable electronics.
The MAX4834/MAX4835 family was engineered specifically for protected power delivery in portable USB, SDIO, and GPS systems-integrating accurate current limiting, FLAG/RESET signaling, and ultra-low IQ in miniature packages.
FAQ
What output voltage does the MAX4834ETT28C deliver, and how accurate is it?
The MAX4834ETT28C delivers a fixed 2.8V output with ±2% accuracy over the full –40°C to +85°C temperature range and 1mA to 250mA load current. This specification is guaranteed by design and correlation-not just tested at +25°C-and applies directly to the MAX4834ETT28C without external components or trimming.
How does the FLAG output of the MAX4834ETT28C behave during an overcurrent event?
The MAX4834ETT28C FLAG output asserts low when load current exceeds 270–330mA for longer than the blanking time (5–17ms). Once asserted, the pass transistor latches off until IN or SHDN is cycled high-low-high. The open-drain FLAG requires an external pull-up and remains low during thermal shutdown or shutdown mode.
Can the MAX4834ETT28C be used with input voltages below 2.5V?
No-the MAX4834ETT28C has a specified 2.5V to 5.5V input operating range. Below 2.5V, undervoltage lockout (UVLO) activates at 2.00–2.25V (rising), disabling regulation. For sub-2.5V operation, consider alternative regulators such as the MAX8867 series, not the MAX4834ETT28C.
What is the purpose of the SS pin on the MAX4834ETT28C, and how is it configured?
The SS pin on the MAX4834ETT28C controls soft-start timing: connecting a capacitor (e.g., 0.01µF) from SS to GND sets the output ramp time (10ms typical). Leaving SS floating yields a 1ms internal minimum ramp. This prevents inrush current spikes and false resets during power-up-critical for reliable MAX4834ETT28C deployment in USB/SDIO systems.
Does the MAX4834ETT28C provide reverse-current protection, and how effective is it?
Yes-the MAX4834ETT28C includes integrated reverse-current protection that limits current from OUT to IN to ≤2µA when VOUT ≥ VIN. This prevents backfeeding into shared input rails, protecting upstream sources like battery chargers or USB hosts-a verified feature confirmed in the Electrical Characteristics table under "Reverse Current at VIN".
MAX4834ETT28C 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):
- 2.8V
- 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 Current
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-TDFN-EP (3x3)
MAX4834ETT28C FAQ
1.How can I place an order for MAX4834ETT28C through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4834ETT28C 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 MAX4834ETT28C reliable?
The price and inventory of MAX4834ETT28C are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4834ETT28C is usually 5 days.
3.What payment methods are accepted for MAX4834ETT28C?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4834ETT28C transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4834ETT28C?
MAX4834ETT28C orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4834ETT28C 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 MAX4834ETT28C?
For technical support, including MAX4834ETT28C datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4834ETT28C requirements.
6.How does Aetrix verify that MAX4834ETT28C is sourced from the original manufacturer or authorized distributors?
All MAX4834ETT28C 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 MAX4834ETT28C meets industry standards.
7.What is the process for return or replacement of MAX4834ETT28C?
All MAX4834ETT28C units undergo pre-shipment inspection (PSI). If there is an issue with MAX4834ETT28C, 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 MAX4834ETT28C part is unused and in its original packaging.
Return procedure for MAX4834ETT28C:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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