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Analog Devices Inc./Maxim Integrated MAX6469TA28AD3+T
- Part No.:
- MAX6469TA28AD3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-WDFN Exposed Pad
- Datasheet:
-
MAX6469TA28AD3+T.pdf
- Description:
- IC REG LIN POS ADJ 300MA 8TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,387
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Product details
Overview
MAX6469TA28AD3+T from Maxim Integrated is a 300mA low-dropout linear regulator with integrated microprocessor reset circuit, fixed 2.8V output, ±2.0% accuracy over -40°C to +85°C, 82µA quiescent current, and 150ms minimum reset timeout. It delivers stable power and reliable reset signaling for battery-powered microprocessor systems requiring compact, low-power supply supervision.
For engineers reviewing the MAX6469TA28AD3+T datasheet, MAX6469TA28AD3+T pinout, MAX6469TA28AD3+T application, or MAX6469TA28AD3+T equivalent, this device serves as a single-chip solution combining regulated DC-DC conversion and precise voltage-monitoring reset functionality - critical for portable embedded systems where board space, battery life, and power-up sequencing integrity are constrained.
Technical Context
The MAX6469TA28AD3+T integrates a precision LDO regulator core with a dedicated reset supervisor using a shared bandgap reference. Its regulator operates from 2.5V to 5.5V input and maintains 2.8V output with dropout as low as 137mV at 300mA (VOUT = 2.8V). The reset circuit monitors VOUT against a -7.5% threshold (2.61V) and asserts an active-low push-pull RESET for ≥150ms after recovery.
This variant belongs to the MAX6469–MAX6476 subgroup: it features SHDN (active-low shutdown), no manual reset (MR) pin, and no remote sense (FB) - confirmed by its TA suffix (TDFN-8) and D3 reset timeout code. Pin 3 is SHDN, not MR or FB, and pin 5 is SET (for optional adjustable mode), consistent with MAX6469/MAX6470 pinout configuration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.8V ±2.0% over -40°C to +85°C - ensures stable core logic supply for 2.8V I/O microcontrollers. |
| Max Output Current | 300mA guaranteed - sufficient to power mid-complexity MCUs, RF transceivers, or sensor hubs without external pass devices. |
| Dropout Voltage | 137mV at 300mA load (VOUT = 2.8V) - enables operation down to VIN = 2.937V, extending battery runtime in single-cell Li-ion or 3× alkaline systems. |
| Quiescent Current | 82µA typical - minimizes standby drain; drops to 0.1µA in shutdown, enabling multi-year coin-cell operation in always-on sensors. |
| Reset Threshold | -7.5% of nominal (2.61V) - aligns with standard µP supply tolerance; prevents premature release during brownout recovery. |
| Reset Timeout | 150ms minimum - satisfies boot-time requirements for ARM Cortex-M and similar processors needing >100ms stabilization before execution. |
| Input Voltage Range | 2.5V to 5.5V - compatible with USB, Li-ion, and multi-cell battery inputs without pre-regulation. |
Pinout & Package
MAX6469TA28AD3+T is housed in an 8-pin TDFN-EP (3mm × 3mm) package with exposed paddle (EP) internally connected to GND. Thermal performance is enhanced by soldering EP to PCB ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN) | Regulator input | Accepts 2.5V–5.5V unregulated supply; requires 0.1µF ceramic bypass to GND for stability. |
| 2 (GND) | Power and thermal ground | Primary return path and heatsink; must connect to large copper area for thermal dissipation. |
| 3 (SHDN) | Active-low shutdown control | Pulling low disables regulator and reduces supply current to 0.1µA; tie to IN for always-on operation. |
| 4 (RESET) | Active-low push-pull reset output | Drives µP reset pin directly; asserts low when VOUT < 2.61V or SHDN is low; holds for ≥150ms post-recovery. |
| 5 (SET) | Feedback/adjustment input | Connect to GND for fixed 2.8V output; connect to resistor divider for adjustable mode (1.25V–5.5V). |
| 6 (OUT) | Regulated output | Delivers 2.8V @ up to 300mA; requires ≥3.3µF low-ESR ceramic capacitor to GND for transient response. |
| 7, 8 (NC) | No-connect | Not bonded; left floating per datasheet - no routing or termination required. |
| EP | Exposed thermal pad | Internally tied to GND; must be soldered to PCB ground plane to achieve specified θJA = 41°C/W. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated reset supervisor | Eliminates need for discrete supervisor IC - reduces BOM count and layout area while ensuring synchronized power-up timing. |
| Low 82µA quiescent current | Extends battery life in always-on applications such as Bluetooth LE sensors or wearable health monitors. |
| 150ms reset timeout | Guarantees µP clock and memory initialization complete before release - avoids race conditions in firmware startup. |
| Thermal and short-circuit protection | Shuts down automatically at 180°C junction temperature and limits output to 450mA - enables robust operation in sealed enclosures. |
| Reverse current blocking | 0.01µA typical OUT-to-IN leakage - prevents backup capacitors or batteries from discharging into depleted primary sources. |
Applications
| Handheld Instruments | PCMCIA / USB Devices |
|---|---|
Use Scenario: Power management in handheld multimeters and portable oscilloscopes with dual battery/USB input. IC Role / Device Role / Timing Role: Provides clean 2.8V rail for MCU, ADC, and display driver; asserts RESET until analog front-end references stabilize. Use Value: Enables single-supply operation from 3× alkaline cells (4.5V) down to 2.94V cutoff, maximizing usable battery capacity. |
Use Scenario: Compact power solution for USB-powered data acquisition cards with FPGA-based signal processing. IC Role / Device Role / Timing Role: Regulates 2.8V for I/O banks and generates synchronized reset pulse aligned with USB enumeration timing. Use Value: Meets USB suspend/resume current limits (<100µA) via SHDN control, reducing host-side power budget overhead. |
| Cellular Telephones | Digital Cameras |
Use Scenario: Baseband processor power and reset in feature phones with removable Li-ion batteries. IC Role / Device Role / Timing Role: Supplies 2.8V to modem SoC and asserts RESET during battery insertion/removal events. Use Value: 137mV dropout allows operation through full discharge curve (4.2V → 3.0V), eliminating need for buck-boost stage. |
Use Scenario: Image sensor and ISP core supply in compact digital still cameras with AA/AAA battery packs. IC Role / Device Role / Timing Role: Powers 2.8V image pipeline and triggers hardware reset on lens motor stall or flash capacitor charging faults. Use Value: 0.1µA shutdown current preserves battery charge during long idle periods between photo sessions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO-with-reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS76328QDBVRQ1 | 200mA output, 120mV dropout at 150mA, no integrated reset - requires external supervisor (e.g., TPS3809). | Lacks monolithic reset function; needs additional footprint and routing for reset generation and timing. | Choose when lower cost and AEC-Q100 qualification are prioritized over integration and board space. |
| NCP302LSQ28T2G | 300mA output, 250mV dropout at 300mA, no reset circuit, no shutdown pin - always-on operation only. | Cannot support controlled power-down sequences or brownout recovery timing; reset must be implemented externally. | Prefer when system-level reset is handled by PMIC or SoC, and ultra-low dropout is not required. |
Compared with TPS76328QDBVRQ1 and NCP302LSQ28T2G, the MAX6469TA28AD3+T uniquely combines 300mA delivery, 137mV dropout, integrated 150ms reset, and 0.1µA shutdown - delivering higher functional density and tighter power sequencing control in space-constrained portable designs.
Availability
MAX6469TA28AD3+T is available at Aetrix Electronics and suitable for handheld instruments, PCMCIA/USB peripherals, and cellular telephone modules requiring stable component supply with guaranteed long-term manufacturability and RoHS-compliant packaging.
Supply support for MAX6469TA28AD3+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 high-performance analog and mixed-signal ICs for power management, sensing, and interface applications across industrial, automotive, and consumer markets.
The MAX6469–MAX6484 family was engineered specifically for battery-powered portable electronics needing tightly integrated, low-quiescent-current LDO regulation and deterministic microprocessor reset - targeting space- and energy-constrained applications like PDAs, digital cameras, and wireless modules.
FAQ
What output voltage does the MAX6469TA28AD3+T deliver?
The MAX6469TA28AD3+T delivers a fixed 2.8V output with ±2.0% accuracy over the full -40°C to +85°C operating range. This voltage is factory-trimmed and does not require external resistors; connecting the SET pin to GND activates the preset mode. The device maintains regulation down to 2.937V input (137mV dropout at 300mA), making it suitable for single-cell Li-ion and multi-cell alkaline battery systems.
Does the MAX6469TA28AD3+T include a shutdown function?
Yes, the MAX6469TA28AD3+T includes an active-low SHDN pin (Pin 3) that reduces total supply current to 0.1µA typical when asserted. In shutdown mode, the pass transistor, reference, and control circuitry are disabled. For normal operation, SHDN must be tied to IN or pulled high via a resistor. This feature enables ultra-low-power sleep states in portable devices - critical for extending battery life in always-on sensors and wearables.
What is the reset timeout period for the MAX6469TA28AD3+T?
The MAX6469TA28AD3+T has a 150ms minimum reset timeout period, indicated by the "D3" suffix in its part number. The RESET output remains low for at least 150ms after VOUT rises above the -7.5% threshold (2.61V), ensuring sufficient time for microprocessor clocks, PLLs, and memory controllers to stabilize before firmware execution begins. This timing is guaranteed over temperature and line/load conditions per the datasheet.
Can the MAX6469TA28AD3+T be used in adjustable-output configurations?
Yes, the MAX6469TA28AD3+T supports adjustable output mode via the SET pin (Pin 5). When disconnected from GND and connected to an external resistor divider between OUT and GND, the output voltage follows VOUT = 1.229V × (1 + R1/R2), enabling outputs from 1.25V to 5.5V. However, the factory-trimmed 2.8V preset remains active only when SET is grounded; no reconfiguration is needed for fixed-voltage use.
What package type is used for the MAX6469TA28AD3+T?
The MAX6469TA28AD3+T uses an 8-pin TDFN-EP (3mm × 3mm) package with exposed thermal pad (EP), denoted by the "TA" prefix in its ordering code. The EP is internally connected to GND and must be soldered to the PCB ground plane to achieve the specified thermal resistance (θJA = 41°C/W). This package offers superior power dissipation versus SOT23-6 and enables high-density layouts in portable equipment.
MAX6469TA28AD3+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:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Adjustable (Fixed)
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.2V (2.8V)
- Voltage - Output (Max):
- 5.5V
- Voltage Dropout (Max):
- 0.21V @ 300mA
- Current - Output:
- 300mA
- Current - Quiescent (Iq):
- 136 µA
- Current - Supply (Max):
- 96 µA
- PSRR:
- -
- Control Features:
- Reset, Shutdown
- Protection Features:
- Over Current, Over Temperature, Reverse Polarity, Short Circuit
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-TDFN (3x3)
MAX6469TA28AD3+T FAQ
1.How can I place an order for MAX6469TA28AD3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6469TA28AD3+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 MAX6469TA28AD3+T reliable?
The price and inventory of MAX6469TA28AD3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6469TA28AD3+T is usually 5 days.
3.What payment methods are accepted for MAX6469TA28AD3+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6469TA28AD3+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6469TA28AD3+T?
MAX6469TA28AD3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6469TA28AD3+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 MAX6469TA28AD3+T?
For technical support, including MAX6469TA28AD3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6469TA28AD3+T requirements.
6.How does Aetrix verify that MAX6469TA28AD3+T is sourced from the original manufacturer or authorized distributors?
All MAX6469TA28AD3+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 MAX6469TA28AD3+T meets industry standards.
7.What is the process for return or replacement of MAX6469TA28AD3+T?
All MAX6469TA28AD3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6469TA28AD3+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 MAX6469TA28AD3+T part is unused and in its original packaging.
Return procedure for MAX6469TA28AD3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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