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Analog Devices Inc./Maxim Integrated MAX4832EUT28C
- Part No.:
- MAX4832EUT28C
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SOT-23-6
- Datasheet:
-
MAX4832EUT28C.pdf
- Description:
- 100MA, LDO LINEAR REGULATOR WITH
- Quantity:
- Payment:
- Shipping:
Inventory:1,834
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Product details
Overview
The MAX4832EUT28C from Maxim Integrated is a 100mA, 2.8V fixed-output 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 130mV dropout at full load, 90µA quiescent current, and reverse-current protection. It is used in USB port power management where precise current limiting and fault flagging are required.
For engineers reviewing the MAX4832EUT28C datasheet, MAX4832EUT28C pinout, MAX4832EUT28C application, or MAX4832EUT28C equivalent, key selection criteria include its 2.8V preset output, FLAG latching behavior under sustained overload, soft-start programmability via external capacitor, thermal shutdown at +165°C, and SOT23-6 package compatibility with space-constrained portable designs.
Technical Context
The MAX4832EUT28C integrates a PMOS pass transistor with accurate current-limit circuitry and blanking-time-controlled FLAG assertion logic. Its internal reference (1.23V) and error amplifier regulate output voltage while monitoring pass-device current to trigger FLAG after tBLANK (5–17ms) when load exceeds 115–135mA.
Soft-start is implemented via external capacitor on SS pin, generating controlled VOUT ramp (1ms minimum, scalable up to 150ms); shutdown disables all circuitry except SHDN input, reducing IQ to 0.1µA. Reverse-current protection ensures IN current remains ≤2µA when VOUT ≥ VIN.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.8V ±2% over -40°C to +85°C - eliminates external feedback network and ensures stable rail for 2.8V I/O domains. |
| Max Output Current | 100mA continuous - supports single-port USB peripheral power delivery without derating at +85°C. |
| Dropout Voltage | 130mV at 100mA - enables regulation from 2.93V input, critical for battery-powered systems near end-of-discharge. |
| Quiescent Current | 90µA typical at full load - minimizes standby power loss in always-on subsystems like SDIO card detection. |
| FLAG Blanking Time | 5–17ms - prevents false triggering during inrush or transient overload, allowing safe startup into capacitive loads. |
| Shutdown Current | 0.1µA - enables deep-sleep mode in host controllers where µA-level leakage must be avoided. |
| Reverse-Current Leakage | ≤2µA when VOUT ≥ VIN - blocks backfeed from powered peripherals into main supply, protecting upstream sources. |
Pinout & Package
MAX4832EUT28C is housed in a 6-pin SOT23-6 package (3.0mm × 1.7mm × 1.3mm), with exposed pad internally connected to GND for thermal enhancement. Pin 1 = IN, Pin 2 = GND, Pin 3 = SHDN, Pin 4 = FLAG, Pin 5 = SS, Pin 6 = OUT.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN) | Input power supply connection | Bypassed with 0.1µF ceramic capacitor; accepts 2.5V–5.5V - defines operating voltage window and noise immunity. |
| 2 (GND) | Analog and power ground reference | Common return path for pass transistor, error amp, and FLAG driver - must be low-impedance to avoid latch-up. |
| 3 (SHDN) | Active-low enable control | Pulled high to IN or ≥1.4V to activate; pulled low to enter 0.1µA shutdown - enables system-level power sequencing. |
| 4 (FLAG) | Open-drain overcurrent indicator | Asserts low when load >115mA for >tBLANK; latches off until IN/SHDN toggled - provides fault persistence without MCU polling. |
| 5 (SS) | Soft-start timing control | Connects to GND via capacitor (e.g., 0.01µF → 10ms ramp); sets inrush current limit and avoids false resets during startup. |
| 6 (OUT) | Regulated output voltage node | Requires ≥3.3µF ceramic cap with ESR <0.2Ω - ensures stability across temperature and load transients up to 100mA. |
Key Features
| Feature | Design Value |
|---|---|
| Latched FLAG output | Prevents repeated fault cycling by holding OFF until reset via IN or SHDN toggle - simplifies host firmware handling of persistent overloads. |
| Programmable soft-start | External CSS capacitor scales rise time from 1ms (no cap) to 150ms (0.1µF) - eliminates input supply sag and downstream reset glitches. |
| Reverse-current protection | Blocks >99.9% backflow from OUT to IN when VOUT > VIN - essential for hot-plug USB/SDIO ports sharing common rails. |
| Thermal shutdown with hysteresis | Shuts down at +165°C junction; restarts at +150°C - provides self-recovery during intermittent overload without manual intervention. |
| Ultra-low shutdown current | 0.1µA max - allows integration into battery-backed real-time clocks or backup supervisors where nanoampere leakage is mandatory. |
Applications
| USB Host Port Protection | SDIO Card Power Control |
|---|---|
|
Use Scenario: Powering USB 2.0 downstream ports in notebook computers with per-port current limiting and fault reporting. IC Role / Device Role / Timing Role: LDO regulator + current-limiting switch + FLAG notifier - delivers clean 2.8V to USB PHY while detecting cable shorts or misbehaving devices. Use Value: Eliminates need for discrete current-sense resistor and comparator; FLAG latching reduces host CPU interrupt load during sustained overload events. |
Use Scenario: Supplying regulated 2.8V to SDIO memory cards in PDAs and GPS handhelds with hot-swap capability. IC Role / Device Role / Timing Role: Fixed-output LDO with reverse-current blocking and soft-start - prevents backfeed from inserted cards and controls inrush during card insertion. Use Value: Ensures compliance with SDIO spec's 2.7–2.9V supply range while enabling safe hot-plug operation without damaging host controller. |
| Notebook Subsystem Rail | Cell Phone Baseband Core Supply |
|
Use Scenario: Generating auxiliary 2.8V rail for touch controller or audio codec in ultraportable notebooks. IC Role / Device Role / Timing Role: Low-quiescent LDO with thermal protection - powers low-duty-cycle peripherals with minimal battery drain and robust fault coverage. Use Value: 90µA IQ extends battery life in suspend mode; thermal shutdown prevents damage during accidental short-circuit during board rework. |
Use Scenario: Providing stable 2.8V supply to baseband processor I/O banks in GSM/UMTS handsets. IC Role / Device Role / Timing Role: Current-limited LDO with FLAG signaling - supplies noise-sensitive digital interfaces while alerting modem firmware of antenna switch faults or ESD events. Use Value: FLAG assertion enables immediate software response (e.g., disable RF section) before thermal runaway occurs, improving field reliability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO current-limiting applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX4834EUT28C | 250mA rated output current; same 2.8V output, FLAG function, and SOT23-6 package - higher current capability but increased dropout (150mV @ 250mA). | Suitable for dual-USB-port or higher-capacitance load applications requiring >100mA margin. | Select MAX4834EUT28C only if peak load exceeds 100mA; verify PCB thermal relief suffices for higher power dissipation. |
| MAX4836EUT28C | 500mA rated output; identical pinout and FLAG functionality - designed for multi-peripheral rails with shared 2.8V distribution. | Used in tablet platforms powering multiple SDIO/USB functions from one regulator; requires larger input/output capacitance. | Choose MAX4836EUT28C when scaling to higher system integration; confirm layout accommodates higher RMS current and thermal mass. |
Compared with MAX4832EUT28C, MAX4834EUT28C and MAX4836EUT28C offer higher current headroom while maintaining identical voltage accuracy, FLAG behavior, and package footprint - enabling seamless upgrade paths without PCB redesign when load requirements increase.
Availability
MAX4832EUT28C is available at Aetrix Electronics and suitable for USB port protection, SDIO device power control, and notebook subsystem rail generation requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant sourcing.
Supply support for MAX4832EUT28C 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, computing, and communications markets.
The MAX4832/MAX4833 product line was designed specifically for portable electronics requiring ultra-low IQ, accurate current limiting, and intelligent fault signaling - targeting USB, SDIO, and cellular baseband power domains where size, efficiency, and reliability are critical.
FAQ
What output voltage does the MAX4832EUT28C provide?
The MAX4832EUT28C provides a factory-trimmed fixed output voltage of 2.8V with ±2% accuracy over the full -40°C to +85°C temperature range and 1mA–100mA load. This value is encoded in the part number suffix "28" per Maxim's naming convention and requires no external resistors or configuration.
How does the FLAG output of the MAX4832EUT28C behave during an overload?
The MAX4832EUT28C FLAG output asserts low when load current exceeds 115–135mA for longer than the blanking time (5–17ms), then latches off the pass transistor. To recover, the system must cycle either IN or SHDN - a feature that prevents automatic retry during persistent faults and simplifies host-side fault handling.
Can the MAX4832EUT28C be used with input voltages below 2.5V?
No - the MAX4832EUT28C has a specified operating input voltage range of 2.5V to 5.5V. Below 2.5V, the device enters undervoltage lockout (UVLO) and disables regulation. Its UVLO threshold is 2.00–2.25V with 50mV hysteresis, ensuring reliable turn-on only within the rated range.
What is the purpose of the SS pin on the MAX4832EUT28C?
The SS (Soft-Start) pin on the MAX4832EUT28C controls output voltage ramp time during power-up. Connecting a capacitor (CSS) from SS to GND sets tSS ≈ CSS (in nF) ms - e.g., 10nF yields ~10ms rise. This limits inrush current, prevents false resets, and ensures clean startup into capacitive loads like USB data lines or SDIO cards.
Does the MAX4832EUT28C provide reverse-current protection?
Yes - the MAX4832EUT28C includes integrated reverse-current protection that limits IN current to ≤2µA when VOUT exceeds VIN. This prevents backfeeding from powered peripherals (e.g., inserted SD cards or USB devices) into the main supply rail, protecting upstream sources and meeting USB/SDIO hot-swap safety requirements.
MAX4832EUT28C 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):
- 2.8V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.13V @ 100mA
- Current - Output:
- 100mA
- Current - Quiescent (Iq):
- 150 µA
- Current - Supply (Max):
- -
- PSRR:
- -
- Control Features:
- Enable, Error Flag, 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:
- SOT-23-6
MAX4832EUT28C FAQ
1.How can I place an order for MAX4832EUT28C through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4832EUT28C 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 MAX4832EUT28C reliable?
The price and inventory of MAX4832EUT28C are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4832EUT28C is usually 5 days.
3.What payment methods are accepted for MAX4832EUT28C?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4832EUT28C transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4832EUT28C?
MAX4832EUT28C orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4832EUT28C 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 MAX4832EUT28C?
For technical support, including MAX4832EUT28C datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4832EUT28C requirements.
6.How does Aetrix verify that MAX4832EUT28C is sourced from the original manufacturer or authorized distributors?
All MAX4832EUT28C 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 MAX4832EUT28C meets industry standards.
7.What is the process for return or replacement of MAX4832EUT28C?
All MAX4832EUT28C units undergo pre-shipment inspection (PSI). If there is an issue with MAX4832EUT28C, 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 MAX4832EUT28C part is unused and in its original packaging.
Return procedure for MAX4832EUT28C:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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