My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX4945LELA+TG104
- Part No.:
- MAX4945LELA+TG104
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Power Management - Specialized
- Package:
- 8-WFDFN
- Datasheet:
-
MAX4945LELA+TG104.pdf
- Description:
- INTEGRATED CIRCUIT
- Quantity:
- Payment:
- Shipping:
Inventory:4,177
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX4945LELA+TG104 from Maxim Integrated is an overvoltage-protection controller with integrated nFET switch, designed for input rail protection in portable electronics. It features a 5.80V (typ) overvoltage lockout (OVLO), 2.45V (typ) undervoltage lockout (UVLO), 80mΩ (typ) RON, 1.2A (min) current-limit protection, and autoretry fault recovery. It safeguards systems powered by 3V–5V adapters against +28V faults and supports external pFET for reverse-polarity protection down to –28V.
For engineers reviewing the MAX4945LELA+TG104 datasheet, MAX4945LELA+TG104 pinout, MAX4945LELA+TG104 application, or MAX4945LELA+TG104 equivalent, key selection criteria include OVLO/UVLO thresholds, autoretry timing (15ms typ), ACOK logic output behavior, thermal shutdown (+175°C), and µDFN-8 (2mm × 2mm) package compatibility with space-constrained PCB layouts.
Technical Context
The device uses an internal charge pump to drive its integrated nFET switch, enabling operation with VIN as low as 2.45V while maintaining gate overdrive above the input rail. Its 15ms (typ) debounce timer prevents false turn-on during adapter plug-in transients, and the 30ms (typ) ACOK assertion delay ensures stable voltage before signaling power-good.
Overcurrent protection triggers within 10µs (typ) to disable the switch; autoretry mode then initiates a 15ms (typ) off-time before re-enabling. Thermal shutdown activates at +175°C (typ) with 40°C hysteresis, and GP output drives an external pFET with clamped voltage (≤19V max between GP and IN) for reverse-voltage blocking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| OVLO Threshold | 5.80V (typ); disables switch if input exceeds this level to prevent downstream damage |
| UVLO Threshold | 2.45V (typ); places device in low-current standby if input drops below this level |
| RON | 80mΩ (typ) at 1A; minimizes conduction loss and self-heating under full load |
| Current Limit | 1.2A (min); protects switch and load from sustained overcurrent events |
| ACOK Assertion Delay | 30ms (typ); ensures stable VIN before asserting active-low power-good signal |
| Autoretry Time | 15ms (typ); defines off-interval before automatic re-enable after overcurrent fault |
| Thermal Shutdown | +175°C (typ); disables switch to prevent junction damage during thermal overload |
Pinout & Package
MAX4945LELA+TG104 is housed in an 8-pin µDFN package (2mm × 2mm, 0.5mm pitch), thermally enhanced with exposed pad, rated for –40°C to +85°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 - IN | Voltage Input | Powers internal charge pump; accepts 2.2V–28V; requires 1µF ceramic bypass for ±15kV HBM ESD rating |
| 3 - GP | pFET Gate Drive | Active-low open-drain output that pulls external pFET gate low when VIN > 0V; clamped to ≤19V differential vs. IN |
| 4 - ACOK | Adapter OK Indicator | Active-low open-drain logic output asserted low only after VIN remains within UVLO–OVLO window for 30ms (typ) |
| 5 - GND | Ground Reference | System ground return for all internal circuitry and charge pump; must be low-impedance |
| 6, 7, 8 - OUT | Switch Output | Drains current from internal nFET; pins electrically tied internally and must be shorted externally for proper operation |
Key Features
| Feature | Design Value |
|---|---|
| Integrated nFET Switch | Eliminates need for external high-side switch; reduces BOM count and layout area in adapter-input protection circuits |
| Programmable OVLO/UVLO | Fixed 5.80V OVLO and 2.45V UVLO enable precise match to Li-ion battery or 3.3V/5V system rails without external resistors |
| Autoretry Fault Recovery | Automatically recovers from transient shorts without host intervention-critical for unattended portable charging applications |
| ACOK Power-Good Logic | Provides clean, debounced system-level power-status signal to microcontroller or PMIC, eliminating need for external monitoring circuitry |
| Reverse Polarity Support | GP output enables use of external pFET to block –28V faults-extending protection beyond internal switch capability |
Applications
| Cell Phones | Digital Still Cameras |
|---|---|
Use Scenario: USB-powered smartphone charging circuit subjected to accidental +12V adapter misconnection or ESD-induced voltage spikes. IC Role / Device Role / Timing Role: Primary input rail protector; monitors VIN, blocks overvoltage via internal nFET, asserts ACOK only after stable 30ms window. Use Value: Prevents damage to baseband processor and battery charger IC; eliminates need for discrete TVS + MOSFET solution. | Use Scenario: Compact digital camera powered by universal AC adapter where polarity reversal or overvoltage may occur during field use. IC Role / Device Role / Timing Role: Dual-role protector-enables reverse-polarity blocking via GP-driven pFET and provides fast (<10µs) overcurrent shutdown. Use Value: Ensures safe operation with third-party adapters; maintains system uptime via autoretry during intermittent short-circuited lens motors. |
| PDAs and Palmtop Devices | MP3 Players |
Use Scenario: Legacy PDA with hot-pluggable cradle interface where voltage surges or incorrect adapters risk damaging flash memory and display drivers. IC Role / Device Role / Timing Role: First-line defense on main VIN rail; UVLO (2.45V) ensures operation down to depleted battery levels during backup charging. Use Value: Extends usable battery range during trickle-charge scenarios; avoids brownout resets during low-VIN transitions. | Use Scenario: Portable MP3 player using mini-USB port for both data and charging, exposing it to inconsistent wall adapters and cable-induced transients. IC Role / Device Role / Timing Role: Overvoltage and reverse-polarity guard; GP output controls external pFET to block negative voltages from faulty cables. Use Value: Enables robust USB-OTG compatibility; eliminates field returns due to adapter-related failures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar overvoltage-protection controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX4945ELA+T | UVLO = 4.15V (vs. 2.45V); same OVLO = 5.80V, RON, autoretry timing | Designed for 5V nominal systems; not suitable for sub-3V battery-backed operation | Select MAX4945ELA+T only if system operates strictly above 4.15V; MAX4945LELA+TG104 is required for 2.45V UVLO support. |
| TPD3S014RTER | No integrated switch; requires external FET; includes integrated USB data-line ESD protection (±15kV IEC 61000-4-2) | Targeted at USB Type-A/B ports with data lines; lacks ACOK output and autoretry logic | Choose TPD3S014RTER only when USB data-line ESD protection is mandatory and external FET layout is acceptable. |
Compared with MAX4945ELA+T and TPD3S014RTER, MAX4945LELA+TG104 uniquely combines 2.45V UVLO, integrated nFET, autoretry, and ACOK in a single µDFN-8 package-making it optimal for compact, battery-aware portable devices requiring autonomous fault recovery without host firmware involvement.
Availability
MAX4945LELA+TG104 is available at Aetrix Electronics and suitable for cell phones, digital still cameras, PDAs and palmtop devices, MP3 players requiring stable component supply, long-term production continuity, and RoHS-compliant packaging.
Supply support for MAX4945LELA+TG104 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, communications, computing, and consumer applications.
The MAX4943–MAX4946/MAX4949 family was engineered specifically for overvoltage and reverse-polarity protection in portable USB-powered devices, integrating protection logic, switch, and status signaling in minimal footprint.
FAQ
What is the overvoltage lockout (OVLO) threshold for MAX4945LELA+TG104?
The MAX4945LELA+TG104 has a preset overvoltage lockout threshold of 5.80V (typical), with a guaranteed range of 5.50V to 6.10V across temperature. This value is factory-trimmed and non-adjustable. When the input voltage exceeds this threshold, the internal nFET switch turns off within 20µs to protect downstream circuitry. The 5.80V setting makes MAX4945LELA+TG104 suitable for 5V nominal systems where margin above standard USB 5V is needed but tolerance for overvoltage is tight.
Does MAX4945LELA+TG104 support reverse-polarity protection?
Yes, MAX4945LELA+TG104 supports reverse-polarity protection down to –28V via its GP (gate-drive) pin, which drives an external p-channel MOSFET. When the input voltage drops below ground, GP pulls low to turn off the external pFET, blocking reverse current flow into the protected load. The GP-to-IN voltage is internally clamped to ≤19V (max), allowing safe use with 30V-rated pFETs. This functionality extends protection beyond the internal nFET's +28V forward limit and is confirmed in the MAX4945LELA+TG104 functional diagram and Applications Information section.
What is the function of the ACOK pin on MAX4945LELA+TG104?
The ACOK pin on MAX4945LELA+TG104 is an active-low, open-drain logic output that signals valid input voltage presence. It asserts low only after the input voltage remains within the UVLO (2.45V) and OVLO (5.80V) window for 30ms (typical), confirming stable adapter connection. During startup, overvoltage, undervoltage, or overcurrent faults, ACOK remains high-impedance or deasserts. A pullup resistor to the host system's logic I/O voltage is required. This feature eliminates the need for external power-good monitoring circuitry in MAX4945LELA+TG104-based designs.
How does the autoretry feature work in MAX4945LELA+TG104?
In MAX4945LELA+TG104, the autoretry feature responds to overcurrent faults by turning off the internal switch within 10µs (typical), holding it off for 15ms (typical), then automatically attempting to re-enable. If the fault persists, the cycle repeats; if cleared, the switch remains on. This behavior is distinct from latchoff variants (e.g., MAX4945BELA+T) and enables autonomous recovery from transient shorts-such as those caused by connector arcing or motor startup-without host MCU intervention. The 15ms retry time is fixed and not user-adjustable in MAX4945LELA+TG104.
What package type and footprint does MAX4945LELA+TG104 use?
MAX4945LELA+TG104 uses an 8-pin µDFN package (2mm × 2mm, 0.5mm pitch) with exposed thermal pad (package code L822-1). It is RoHS-compliant and lead-free. The top mark is ABG. This package requires standard µDFN land pattern per Maxim document 21-0164 and supports reflow soldering per JEDEC J-STD-020. Pin 1 is located at the bottom-left corner when the top mark is oriented upright; pins 6–8 are internally bonded to the same die node and must be shorted together on the PCB. No alternate packages are offered for MAX4945LELA+TG104.
MAX4945LELA+TG104 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-WFDFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Applications:
- Overvoltage Protection Controller
- Current - Supply:
- 50µA
- Voltage - Supply:
- 2.2V ~ 28V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-µDFN (2x2)
MAX4945LELA+TG104 FAQ
1.How can I place an order for MAX4945LELA+TG104 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4945LELA+TG104 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 MAX4945LELA+TG104 reliable?
The price and inventory of MAX4945LELA+TG104 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4945LELA+TG104 is usually 5 days.
3.What payment methods are accepted for MAX4945LELA+TG104?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4945LELA+TG104 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4945LELA+TG104?
MAX4945LELA+TG104 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4945LELA+TG104 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 MAX4945LELA+TG104?
For technical support, including MAX4945LELA+TG104 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4945LELA+TG104 requirements.
6.How does Aetrix verify that MAX4945LELA+TG104 is sourced from the original manufacturer or authorized distributors?
All MAX4945LELA+TG104 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 MAX4945LELA+TG104 meets industry standards.
7.What is the process for return or replacement of MAX4945LELA+TG104?
All MAX4945LELA+TG104 units undergo pre-shipment inspection (PSI). If there is an issue with MAX4945LELA+TG104, 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 MAX4945LELA+TG104 part is unused and in its original packaging.
Return procedure for MAX4945LELA+TG104:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX4945LELA+TG104 Tags
-
TPS2511DGNR
Texas Instruments
-
UTC2000/MG
Microchip Technology
-
TUSB320HAIRWBR
Texas Instruments
-
TPS61252DSGR
Texas Instruments
-
PI5USB30216CXUAEX
Diodes Incorporated
-
SN6501DBVR
Texas Instruments
-
CYPD3177-24LQXQT
Infineon Technologies
-
SN6501QDBVRQ1
Texas Instruments
-
STUSB1600AQTR
STMicroelectronics
-
SN6505BDBVR
Texas Instruments
-
SN6501DBVT
Texas Instruments
-
TPS65150PWPR
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
