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Analog Devices Inc./Maxim Integrated MAX8719ETA+T
- Part No.:
- MAX8719ETA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Special Purpose Regulators
- Package:
- 8-WDFN Exposed Pad
- Datasheet:
-
MAX8719ETA+T.pdf
- Description:
- IC REG LDO NOTEBOOK 1OUT 8TDFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
The MAX8719ETA+T from Maxim Integrated is an adjustable-output, high-voltage linear regulator IC designed for keep-alive power in notebook computers and smart-battery systems. It delivers up to 100mA output current with 1.24V to 28V programmable output, 25µA max no-load quiescent current, and integrated power-good monitoring with fixed 100ms delay - enabling reliable RTC and microcontroller backup during battery-to-adapter switchover.
For engineers reviewing the MAX8719ETA+T datasheet, MAX8719ETA+T pinout, MAX8719ETA+T application, or MAX8719ETA+T equivalent, key selection criteria include its 4V–28V input range, adjustable feedback architecture (1.24V reference), thermal shutdown at +165°C, TDFN-8 package thermal performance (1951mW at +70°C), and PGOOD open-drain output rated to 28V.
Technical Context
The MAX8719ETA+T implements a BiCMOS-based low-dropout linear regulator with external resistive feedback control via the FB pin, referencing a precise 1.24V internal bandgap. Its power-good comparator monitors VCC independently and asserts PGOOD after a guaranteed 100ms delay once regulation is achieved.
Shutdown is controlled by the SHDN pin, reducing supply current to ≤3µA; thermal protection disables the pass transistor above +165°C junction temperature and re-enables it after 20°C cooldown. The device requires only a 5µA minimum load to maintain regulation and supports stable operation with output capacitors as low as 1µF + 0.23µF/mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 28V - supports direct connection to high-voltage batteries and off-line supplies without pre-regulation. |
| Output Voltage Range | 1.24V to 28V adjustable - set via external resistor divider on FB pin; enables flexible system rail generation. |
| Quiescent Supply Current | 25µA max - preserves battery life in always-on keep-alive applications like RTC and CMOS RAM backup. |
| Output Current | 100mA continuous - sufficient for microcontrollers and low-power peripherals in portable systems. |
| Dropout Voltage | 560mV at 100mA - ensures regulation even when input drops close to output voltage (e.g., 5.56V IN for 5V OUT). |
| PGOOD Delay | 100ms min active timeout - guarantees output settling before system logic proceeds, preventing premature wake-up. |
| Thermal Shutdown Threshold | +165°C with 20°C hysteresis - protects against sustained overload while allowing recovery under intermittent fault conditions. |
Pinout & Package
MAX8719ETA+T uses a thermally enhanced 3mm × 3mm, 8-lead TDFN package with exposed paddle (pin 7 = I.C., unconnected). The package supports 1951mW power dissipation at +70°C ambient and features 41°C/W junction-to-case thermal resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 IN | Positive supply input | Accepts 4V–28V input; connects directly to high-voltage battery or adapter rail. |
| 2 GND | Ground reference and thermal path | Electrical ground and primary heat conduction path via exposed paddle - must be soldered to ≥650mm² copper area. |
| 3 FB | Feedback input | Senses output voltage via external resistor divider; regulates to 1.24V nominal reference. |
| 4 VCC | PGOOD sense input | Monitors regulated output (or other rail); PGOOD asserts when VCC exceeds 90% of FB-set threshold. |
| 5 PGOOD | Open-drain power-good output | Active-high signal with 28V rating; requires external pull-up; delays 100ms on power-up, responds in 4.5µs on fault. |
| 6 SHDN | Shutdown control input | Active-low enable; pulls supply current to ≤3µA when grounded; connect to IN for automatic startup. |
| 7 I.C. | Internal connection | Factory test pin - electrically isolated in application; leave unconnected and unpopulated. |
| 8 OUT | Regulated output | Delivers up to 100mA; requires ≥5µA minimum load for regulation; ESR < 1Ω required for stability. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable output (1.24V–28V) | Enables single BOM support across multiple system rails using external R1/R2; eliminates need for multiple fixed-output regulators. |
| 100ms PGOOD delay | Prevents false system boot signals by ensuring output settles within ±2% before asserting readiness - critical for RTC and firmware initialization. |
| 25µA quiescent current | Extends battery runtime in always-on applications: e.g., >1 year on a 200mAh coin cell powering 5µA RTC + MAX8719ETA+T. |
| Thermal shutdown with hysteresis | Automatically cycles during sustained overload (e.g., short-circuit), limiting junction temperature to safe levels without requiring external circuitry. |
| TDFN-8 with exposed paddle | Provides 41°C/W thermal resistance and 1951mW dissipation at +70°C - enables compact layout in space-constrained notebook and smart-battery modules. |
Applications
| CMOS/RTC Backup Power | Microcontroller Housekeeping Power |
|---|---|
Use Scenario: Maintaining timekeeping and volatile memory state during AC adapter removal or battery swap in ultraportable notebooks. IC Role / Device Role / Timing Role: Always-on linear regulator supplying clean 3.3V or user-defined rail to RTC and SRAM while main system is powered down. Use Value: 25µA quiescent current extends coin-cell life beyond 1 year; 100ms PGOOD delay prevents RTC corruption during transient brownouts. | Use Scenario: Providing stable, low-noise supply to microcontrollers managing battery fuel gauging, charging control, or system health monitoring in smart-battery packs. IC Role / Device Role / Timing Role: Primary housekeeping regulator delivering adjustable output (e.g., 2.5V or 1.8V) to MCU core and ADC reference. Use Value: Adjustable 1.24V–28V output supports diverse MCU voltage requirements; ±2% output accuracy ensures precise ADC measurements and stable clock generation. |
| Notebook Computer Keep-Alive Rail | Off-Line Supply Housekeeping |
Use Scenario: Powering embedded controllers and real-time clocks during switchover between 19V AC adapter and 12V lithium-polymer battery in thin-and-light notebooks. IC Role / Device Role / Timing Role: High-input-voltage LDO maintaining regulation through fast VIN transients (e.g., 19V → 12V step) without dropout or reset. Use Value: 560mV dropout at 100mA and fast line-transient response (<200mV deviation) ensure uninterrupted operation during dynamic input changes. | Use Scenario: Generating bias rails for control ICs and communication interfaces in offline AC/DC adapters where primary-side regulation is unavailable. IC Role / Device Role / Timing Role: Secondary-side linear regulator deriving stable 5V or 12V from rectified DC bus (e.g., 24V–36V) for supervisor and telemetry functions. Use Value: 4V–28V input range accepts wide DC bus variation; thermal shutdown protects against overloads in sealed adapter enclosures with limited airflow. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable-output, high-input-voltage linear regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3080IMSE#PBF | 1.2V–36V output, 1.1A output current, 1.2V reference, higher quiescent current (1.1mA) | Higher current capability suits industrial controllers; less suitable for ultra-low-power keep-alive due to 44× higher IQ | Select when >100mA load or wider output range (up to 36V) is required; verify thermal design for 1.1mA IQ in battery-critical systems. |
| TSP50232DR | Fixed 3.3V/5V outputs only, 200mA output, 35µA IQ, no PGOOD, SO-8 package | Lacks adjustability and power-good signaling; simpler for fixed-rail designs but not drop-in for MAX8719ETA+T's FB-controlled topology | Choose for cost-sensitive, fixed-output applications where PGOOD and adjustable voltage are unnecessary; requires PCB redesign due to SO-8 footprint. |
Compared with LT3080IMSE#PBF and TSP50232DR, the MAX8719ETA+T uniquely balances ultra-low quiescent current (25µA), integrated PGOOD with delay, and 1.24V–28V adjustability in a thermally optimized TDFN-8 - making it optimal for battery-backed keep-alive and smart-battery housekeeping where power efficiency and reliability are paramount.
Availability
MAX8719ETA+T is available at Aetrix Electronics and suitable for notebook computer keep-alive power, smart-battery pack housekeeping, and off-line supply auxiliary rail generation requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for MAX8719ETA+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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for computing, communications, and industrial applications.
The MAX8718/MAX8719 product line was engineered specifically for high-input-voltage, ultra-low-power keep-alive regulation in portable computing and battery-management systems - emphasizing thermal robustness, precision feedback, and integrated power supervision.
FAQ
What is the minimum load requirement for stable regulation of the MAX8719ETA+T?
The MAX8719ETA+T requires a minimum load current of 5µA on the OUT pin to maintain output regulation. This is specified in the Electrical Characteristics table and applies across the full operating temperature range (-40°C to +85°C). Failure to meet this minimum load may result in output voltage drift or instability, especially near dropout conditions. For applications with intermittent or zero-load states, a small bleeder resistor (e.g., 680kΩ for ~5µA at 3.4V) is recommended.
How does the PGOOD function work on the MAX8719ETA+T, and what is its timing behavior?
The MAX8719ETA+T's PGOOD output is an open-drain signal that goes high when the VCC sense input exceeds 90% of the FB-set regulation threshold. It features a guaranteed minimum 100ms delay after regulation is achieved (power-up), ensuring output settling before system logic proceeds. On power-down or fault, PGOOD deasserts rapidly - within 4.5µs - allowing immediate system response. The output is rated to 28V and must be pulled up externally, typically to OUT or another compatible rail.
Can the MAX8719ETA+T be used with input voltages below 4V?
No, the MAX8719ETA+T is not specified or guaranteed for operation below 4V input. Its Absolute Maximum Ratings define IN-to-GND as -0.3V to +30V, but the functional operating range begins at 4V per the Electrical Characteristics table. Operation below 4V may result in failure to regulate, excessive dropout, or undefined PGOOD behavior. For sub-4V applications, consider alternative regulators such as the MAX1725 or TPS7A05 series.
What thermal design considerations apply to the MAX8719ETA+T in its TDFN-8 package?
The MAX8719ETA+T's TDFN-8 package relies on the exposed paddle (connected to GND) for thermal conduction. To achieve the rated 1951mW power dissipation at +70°C ambient, the GND pad must be soldered to a minimum 650mm² copper area on the PCB - ideally a solid ground plane. Thermal resistance junction-to-case is 41°C/W; insufficient copper area increases thermal resistance, risking premature thermal shutdown. Layout guidelines also recommend short, wide traces for IN and OUT paths and placement of input/output capacitors within 3mm of their respective pins.
Is the MAX8719ETA+T pin-compatible with the MAX8718ETA+T?
Yes, the MAX8719ETA+T and MAX8718ETA+T share identical pinout, package (3mm × 3mm TDFN-8), and footprint - but differ functionally at Pin 3: MAX8718 uses 5/3 for fixed 3.3V/5V selection, while MAX8719 uses FB for adjustable output feedback. Swapping them requires board-level changes to Pin 3 routing (from 5/3 tie-off to FB divider network) and validation of PGOOD sensing (VCC threshold tracks FB, not output voltage). They are not drop-in replacements without schematic and layout modification.
MAX8719ETA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-WDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Applications:
- LDO (Linear), Notebook Power System
- Voltage - Input:
- 4V ~ 28V
- Number of Outputs:
- 1
- Voltage - Output:
- 1.24V ~ 28V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-TDFN (3x3)
MAX8719ETA+T FAQ
1.How can I place an order for MAX8719ETA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8719ETA+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 MAX8719ETA+T reliable?
The price and inventory of MAX8719ETA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8719ETA+T is usually 5 days.
3.What payment methods are accepted for MAX8719ETA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8719ETA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8719ETA+T?
MAX8719ETA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8719ETA+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 MAX8719ETA+T?
For technical support, including MAX8719ETA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8719ETA+T requirements.
6.How does Aetrix verify that MAX8719ETA+T is sourced from the original manufacturer or authorized distributors?
All MAX8719ETA+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 MAX8719ETA+T meets industry standards.
7.What is the process for return or replacement of MAX8719ETA+T?
All MAX8719ETA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX8719ETA+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 MAX8719ETA+T part is unused and in its original packaging.
Return procedure for MAX8719ETA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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