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Analog Devices Inc./Maxim Integrated MAX4829ELT+T
- Part No.:
- MAX4829ELT+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Current Regulation/Management
- Package:
- 6-WFDFN
- Datasheet:
-
MAX4829ELT+T.pdf
- Description:
- IC CURRENT LIMITING 6UDFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,345
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Product details
Overview
The MAX4829ELT+T from Maxim Integrated is a 100mA current-limiting load switch with autoretry functionality, designed for fault-protected power routing in portable electronics. It features 0.7Ω on-resistance, 14ms guaranteed blanking time, open-drain FFLG and NOLD flags, and operates from +2.3V to +5.5V - enabling robust overcurrent and no-load detection in GPS modules and digital cameras.
For engineers reviewing the MAX4829ELT+T datasheet, MAX4829ELT+T pinout, MAX4829ELT+T application, or MAX4829ELT+T equivalent, key selection criteria include its 100mA forward-current limit, autoretry behavior (vs. latchoff), 6-pin µDFN package, reverse-current protection, and thermal shutdown at +150°C.
Technical Context
The MAX4829ELT+T implements dual current-sense comparators to independently monitor forward (IN→OUT) and reverse (OUT→IN) current against a 100mA threshold. Upon exceeding this limit for >14ms, it initiates autoretry: turning off for tRETRY (196–840ms), then re-enabling to test fault clearance.
Its NOLD output asserts low when load current falls below 10mA, with 60µs response delay on assertion only; FFLG is open-drain and requires external pullup to IN. Undervoltage lockout (1.8–2.2V rising edge) prevents operation during brownout, and thermal shutdown triggers immediate FFLG assertion without blanking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Forward Current Limit | 100mA minimum - guarantees consistent trip point across -40°C to +85°C for reliable short-circuit protection. |
| On-Resistance | 0.7Ω typical at +25°C - minimizes voltage drop and power loss (e.g., <70mV drop at 100mA). |
| Blanking Time | 14ms minimum - suppresses false FFLG assertions during hot-swap transients or capacitive load charging. |
| No-Load Threshold | 10mA - enables accurate detection of disconnected or ultra-low-power loads (e.g., standby sensors). |
| Supply Voltage Range | +2.3V to +5.5V - supports direct integration with Li-ion battery rails and 3.3V/5V system supplies. |
| Quiescent Current | 65µA typical - ensures minimal battery drain during active operation in always-on subsystems. |
| Shutdown Current | 0.01µA - reduces leakage to negligible levels when ON pin is driven low, critical for long-term storage modes. |
Pinout & Package
Package: 6-pin µDFN (1mm × 1.5mm, 0.5mm pitch), RoHS-compliant, wettable flank capable.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - IN | Power Input | Bypass with 0.1µF ceramic capacitor to GND; accepts +2.3V to +5.5V supply; source for internal regulators and current sense. |
| 2 - GND | Ground Reference | Primary return path for load current, internal bias, and thermal dissipation; must be low-impedance connection. |
| 3 - OUT | Switched Output | Delivers current-limited power to load; bypass with 0.1µF capacitor to GND to suppress turn-off ringing and prevent false NOLD assertion. |
| 4 - FFLG | Fault Flag Output | Open-drain signal pulled low during forward/reverse overcurrent (>14ms), thermal shutdown, or UVLO; requires external pullup to IN. |
| 5 - NOLD | No-Load Flag Output | Open-drain signal pulled low when load current <10mA; high-impedance during shutdown or autoretry retry period unless reverse fault present. |
| 6 - ON | Enable Control | Active-high logic input; drives switch ON when >2.0V; pulls to GND to enter 0.01µA shutdown mode. |
Key Features
| Feature | Design Value |
|---|---|
| Autoretry Fault Recovery | Automatically cycles ON/OFF after overcurrent faults (tBLANK = 14ms, tRETRY = 196–840ms), reducing average power dissipation by ~94% vs. continuous latchoff. |
| Reverse-Current Protection | Detects and shuts down for OUT→IN current >100mA, preventing backfeed into powered-down rails or battery drain through parasitic paths. |
| Thermal Shutdown | Immediate FFLG assertion and switch disable at +150°C junction temperature, with 15°C hysteresis for stable recovery in autoretry mode. |
| No-Load Detection | 10mA threshold with 60µs assertion delay ensures reliable identification of open-circuit or sleep-mode conditions without false triggers from transient dips. |
| Undervoltage Lockout | 1.8–2.2V activation range prevents erratic switching during power ramp-up or brownout, ensuring clean enable/disable sequencing. |
Applications
| GPS Module Power Management | Digital Camera Flash Circuit |
|---|---|
|
Use Scenario: Powering GPS RF front-end and baseband ICs with strict fault containment requirements. IC Role / Device Role / Timing Role: Load switch providing current-limited 3.3V rail with real-time fault reporting via FFLG/NOLD to host MCU. Use Value: Prevents GPS module damage from antenna short circuits while enabling automatic recovery without host intervention. |
Use Scenario: Enabling flash LED driver IC only when camera is actively capturing images. IC Role / Device Role / Timing Role: High-side power switch controlling VCC to flash controller, with no-load detection confirming LED disconnection. Use Value: Eliminates standby current leakage and detects broken LED strings before flash activation, improving reliability. |
| MP3 Player Audio Codec Supply | PDA Backlight Driver Enable |
|
Use Scenario: Isolating audio codec power domain from main SoC rail during playback/pause transitions. IC Role / Device Role / Timing Role: Low-RON switch delivering stable 2.8V to codec, with FFLG signaling overcurrent due to headphone short. Use Value: Maintains <70mV dropout at full load while protecting codec IC from sustained shorts during jack insertion. |
Use Scenario: Controlling power to white LED backlight driver in handheld PDA with variable brightness. IC Role / Device Role / Timing Role: Current-limited enable path for boost converter, using NOLD to verify LED string continuity before dimming. Use Value: Detects open-circuit LEDs prior to PWM dimming, avoiding unregulated boost voltage spikes that could damage driver IC. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current-limiting load switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX4828ELT+T | Same 100mA limit and 0.7Ω RON, but uses latchoff (not autoretry) fault response. | Requires manual ON toggle or power cycle to recover from overcurrent; unsuitable where autonomous recovery is needed. | Select MAX4828ELT+T only if system firmware handles fault reset explicitly and power cycling is acceptable. |
| TPS22945DSGR | 1.2A limit, 44mΩ RON, no NOLD flag, fixed 1.2ms blanking, no reverse-current protection. | Higher current capacity but lacks no-load detection and reverse-current blocking - insufficient for GPS/camera no-load monitoring. | Choose TPS22945DSGR only for higher-current, non-reverse-sensitive applications where NOLD is unnecessary. |
Compared with MAX4829ELT+T, MAX4828ELT+T offers identical electrical specs but eliminates autoretry - increasing system-level fault-handling complexity. TPS22945DSGR trades precision no-load/thermal/reverse protection for higher current and lower RON, making it incompatible for applications requiring 10mA NOLD threshold or reverse-current blocking.
Availability
MAX4829ELT+T is available at Aetrix Electronics and suitable for GPS systems, digital still cameras, MP3 players, and PDA power management requiring stable component supply, automotive-grade reliability, and compact 1mm × 1.5mm packaging.
Supply support for MAX4829ELT+T 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, communications, and consumer applications.
The MAX4826–MAX4831 family was engineered specifically for space-constrained portable devices needing intelligent, self-protecting load switching with diagnostic feedback - targeting battery-powered GPS, imaging, and handheld computing platforms.
FAQ
What is the guaranteed forward current limit for MAX4829ELT+T?
The MAX4829ELT+T guarantees a minimum forward current limit of 100mA across its full operating temperature range (-40°C to +85°C). This value is tested and specified under RL = 5Ω load conditions, ensuring consistent overcurrent protection regardless of ambient temperature or supply voltage within the +2.3V to +5.5V range. The MAX4829ELT+T maintains this limit with ±20% tolerance, making it suitable for precise load protection in portable electronics.
Does MAX4829ELT+T support reverse-current protection?
Yes, the MAX4829ELT+T provides reverse-current protection with a guaranteed limit of 100mA for OUT-to-IN current flow. When reverse current exceeds this threshold for longer than the 14ms blanking time, the device disables the switch and asserts FFLG low. This feature prevents backfeeding into powered-down subsystems or battery discharge through parasitic paths - a critical capability in multi-rail portable systems where MAX4829ELT+T is commonly deployed.
How does the autoretry function work in MAX4829ELT+T?
The MAX4829ELT+T enters autoretry mode upon detecting a forward or reverse overcurrent condition lasting beyond the 14ms blanking time: it turns OFF for tRETRY (196–840ms), then automatically re-enables. If the fault persists, the cycle repeats; if cleared, the switch remains ON. This behavior reduces average power dissipation by ~94% compared to continuous conduction, and is intrinsic to MAX4829ELT+T - distinguishing it from latchoff variants like MAX4828ELT+T.
What is the no-load detection threshold for MAX4829ELT+T?
The MAX4829ELT+T asserts its NOLD flag low when load current falls below 10mA - a fixed threshold confirmed for the MAX4826–MAX4829 subfamily. This detection has a 60µs delay on assertion (but not deassertion) and operates independently of ON state, remaining active during autoretry retry periods unless a reverse-current fault overrides it. The 10mA threshold enables reliable identification of disconnected peripherals or deep-sleep states in applications such as GPS modules and digital cameras using MAX4829ELT+T.
What package type and footprint does MAX4829ELT+T use?
The MAX4829ELT+T is housed in a 6-pin µDFN package measuring 1.0mm × 1.5mm with 0.5mm pitch and wettable flanks. Its outline number is 21-0147, and land pattern data is available at maximintegrated.com/packages. This ultra-compact, thermally efficient package supports high-density PCB layouts in space-constrained portable devices - a key reason MAX4829ELT+T is selected for GPS receivers and digital still cameras where board area is at a premium.
MAX4829ELT+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 6-WFDFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Current Limiting
- Sensing Method:
- -
- Accuracy:
- -
- Voltage - Input:
- 2.3V ~ 5.5V
- Current - Output:
- 100mA
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-µDFN (1.5x1)
MAX4829ELT+T FAQ
1.How can I place an order for MAX4829ELT+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4829ELT+T 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 MAX4829ELT+T reliable?
The price and inventory of MAX4829ELT+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4829ELT+T is usually 5 days.
3.What payment methods are accepted for MAX4829ELT+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4829ELT+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4829ELT+T?
MAX4829ELT+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4829ELT+T 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 MAX4829ELT+T?
For technical support, including MAX4829ELT+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4829ELT+T requirements.
6.How does Aetrix verify that MAX4829ELT+T is sourced from the original manufacturer or authorized distributors?
All MAX4829ELT+T 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 MAX4829ELT+T meets industry standards.
7.What is the process for return or replacement of MAX4829ELT+T?
All MAX4829ELT+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX4829ELT+T, 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 MAX4829ELT+T part is unused and in its original packaging.
Return procedure for MAX4829ELT+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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