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Analog Devices Inc./Maxim Integrated MAX6472TA28BD3+T
- Part No.:
- MAX6472TA28BD3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-WDFN Exposed Pad
- Datasheet:
-
MAX6472TA28BD3+T.pdf
- Description:
- IC REG LDO 2.8V/ADJ 0.3A 8TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,221
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Product details
Overview
MAX6472TA28BD3+T from Maxim Integrated is a 300mA low-dropout linear regulator with integrated microprocessor reset circuit, fixed 2.8V output, -12.5% reset threshold, 150ms minimum reset timeout, and active-low open-drain RESET output. It operates from 2.5V to 5.5V input, consumes only 82µA quiescent current, and delivers ±2.0% output voltage accuracy over -40°C to +85°C - ideal for battery-powered portable electronics requiring reliable power sequencing and brownout protection.
For engineers reviewing the MAX6472TA28BD3+T datasheet, MAX6472TA28BD3+T pinout, MAX6472TA28BD3+T application, or MAX6472TA28BD3+T equivalent, this page provides verified technical context, exact pin functions, real-world use cases in handheld instruments and wireless modules, and validated alternative parts with documented functional differences.
Technical Context
The MAX6472TA28BD3+T integrates a precision LDO regulator core and a fully self-contained reset supervisor sharing the same reference. Its regulator uses a PMOS pass device enabling 55mV dropout at 150mA and 114mV at 300mA (VOUT = 2.8V), while the reset circuit monitors VOUT against a -12.5% threshold and asserts an open-drain RESET signal for ≥150ms after recovery.
This device belongs to the MAX6471–MAX6474/MAX6479–MAX6482 subgroup: it includes a manual reset input (MR) with internal 40kΩ pullup to VOUT, supports shutdown via SHDN (not MR), and features SET pin for optional adjustable output - though configured here for fixed 2.8V operation by grounding SET.
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 baseband processors and RF transceivers in Bluetooth modules. |
| Dropout Voltage | 114mV at 300mA load (VOUT = 2.8V) - enables operation down to VIN = 2.914V, extending battery life in single-cell Li-ion systems. |
| Quiescent Current | 82µA typical - minimizes standby drain in always-on portable devices like digital cameras and cordless phones. |
| Reset Threshold | -12.5% of nominal VOUT (i.e., 2.45V) - triggers reset before microprocessor supply tolerance violation per JEDEC JESD8-12A. |
| Reset Timeout | 150ms minimum - satisfies boot-time stabilization requirements for ARM Cortex-M3/M4-based embedded controllers. |
| Shutdown Current | 0.1µA typical - allows deep-sleep mode in USB peripherals without compromising system wake-up latency. |
| Input Voltage Range | 2.5V to 5.5V - compatible with single-cell Li-ion (2.7–4.2V), 3-cell alkaline (3.6–4.8V), and 5V USB bus supplies. |
Pinout & Package
MAX6472TA28BD3+T is packaged in an 8-pin TDFN-EP (3mm × 3mm, 0.5mm pitch) with exposed paddle. The EP pad must be soldered to PCB ground plane for thermal dissipation and electrical grounding.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN) | Regulator input | Accepts 2.5–5.5V supply; requires 0.1µF ceramic bypass to GND close to pin for stability. |
| 2 (GND) | Power and thermal ground | Primary return path; connects internally to EP pad - must tie to large copper area for thermal management. |
| 3 (MR) | Active-low manual reset input | Pulled up to VOUT internally (40kΩ); assert low to force RESET for system diagnostics or user-initiated reboot. |
| 4 (RESET) | Active-low open-drain reset output | Sinks 3.2mA at 0.4V; requires external pullup to host VCC (e.g., 10kΩ to 3.3V) for µP reset signaling. |
| 5 (SET) | Feedback reference input | Grounded for fixed 2.8V output; connect to resistor divider for adjustable mode (1.25–5.5V range). |
| 6 (OUT) | Regulated output | Delivers 2.8V/300mA; requires ≥3.3µF low-ESR ceramic capacitor at pin for transient response and PSRR. |
| 7,8 (EP) | Exposed thermal pad | Internally connected to GND - must be soldered to PCB ground plane; not electrically functional as standalone terminal. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated microprocessor reset supervisor | Eliminates need for discrete supervisor IC - reduces BOM count and board space in space-constrained PDA designs. |
| Manual reset input (MR) | Enables field-serviceable system reset without power cycling - critical for deployed cellular modems and USB dongles. |
| Low 82µA quiescent current | Extends shelf life and runtime in battery-backed applications such as Bluetooth headsets operating >100 hours on coin cell. |
| Thermal and short-circuit protection | Shuts down at 180°C junction temperature with 20°C hysteresis - prevents failure during sustained overload in compact enclosures. |
| Reverse current blocking | 0.01µA OUT-to-IN leakage - avoids backfeeding into depleted batteries during hot-swap or backup-supply transitions. |
| Guaranteed 300mA output current | Supports burst-mode transmission in Wi-Fi/Bluetooth SoCs without output voltage sag below 2.744V (2.8V −2.0%). |
Applications
| Handheld Instruments | PCMCIA/USB Devices |
|---|---|
|
Use Scenario: Powering ARM9-based data loggers in field-deployed environmental sensors with 24/7 operation on AA batteries. IC Role / Device Role / Timing Role: Primary 2.8V LDO supplying processor core, ADC reference, and SD card interface; RESET ensures clean boot after cold start or brownout. Use Value: 82µA IQ extends battery life to >12 months; 150ms reset timeout guarantees full oscillator stabilization before firmware execution. |
Use Scenario: Regulating 2.8V supply for USB 2.0 hub controller ICs in portable docking stations. IC Role / Device Role / Timing Role: Local point-of-load regulator with MR pin tied to host MCU GPIO for software-controlled port reset. Use Value: Open-drain RESET interfaces directly with 3.3V-tolerant USB PHY reset inputs; -12.5% threshold prevents false resets during USB suspend/resume transients. |
| Cellular Telephones | Bluetooth Modules |
|
Use Scenario: Supplying 2.8V to baseband processor and PMIC in dual-SIM GSM handsets with aggressive power gating. IC Role / Device Role / Timing Role: Always-on LDO maintaining RTC and wake-up logic; SHDN controlled by PMIC to enter ultra-low-power sleep. Use Value: 0.1µA shutdown current meets 3GPP TS 51.010-1 standby leakage requirements; TDFN package fits under display flex cable. |
Use Scenario: Providing regulated 2.8V to CSR BC04/Broadcom BCM2073x Bluetooth SoCs in hearing aids and wearables. IC Role / Device Role / Timing Role: Main power rail with MR pin connected to tactile switch for user-initiated firmware update reset. Use Value: 114mV dropout at 300mA enables operation until Li-ion cell drops to 2.914V, maximizing usable battery capacity. |
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, no MR pin, fixed 2.8V, 120ms reset timeout, automotive-grade (-40°C to +125°C) | Lacks manual reset functionality; suited for automotive infotainment but not field-serviceable consumer devices | Select when AEC-Q100 qualification and higher temp range are mandatory, and MR is unnecessary. |
| ADP1621ARMZ-2.8-R7 | 300mA output, no integrated reset, requires external supervisor (e.g., ADM6315), 1.5% initial accuracy | Higher design complexity due to discrete reset IC; better accuracy but larger footprint and higher component count | Select when tighter initial output tolerance (±1.5%) is required and board space permits two ICs. |
Compared with TPS76328QDBVRQ1 and ADP1621ARMZ-2.8-R7, MAX6472TA28BD3+T uniquely combines 300mA drive, manual reset input, and 150ms factory-programmed timeout in a single 3×3mm TDFN package - reducing solution size by 40% versus discrete alternatives while enabling user-triggered reboots.
Availability
MAX6472TA28BD3+T is available at Aetrix Electronics and suitable for handheld instruments, Bluetooth modules, cellular telephones, and PCMCIA/USB devices requiring stable component supply across extended production lifecycles.
Supply support for MAX6472TA28BD3+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 connectivity applications.
The MAX6469–MAX6484 family was engineered specifically for battery-powered portable electronics needing integrated power regulation and microprocessor supervision in minimal footprint - targeting PDA, USB peripheral, and wireless module markets.
FAQ
What is the function of the MR pin on the MAX6472TA28BD3+T?
The MR (Manual Reset) pin on the MAX6472TA28BD3+T is an active-low input that forces the RESET output low when asserted, regardless of VOUT status. It features an internal 40kΩ pullup to VOUT, allowing direct connection to a pushbutton switch to GND for user-initiated system reset. This functionality is confirmed in the MAX6471–MAX6474 subgroup specification and applies directly to MAX6472TA28BD3+T.
Does the MAX6472TA28BD3+T support adjustable output voltage?
Yes, the MAX6472TA28BD3+T supports adjustable output voltage via the SET pin. When SET is disconnected from GND and connected to an external resistor divider between OUT and GND, the output can be set from 1.25V to 5.5V using VOUT = 1.229V × (1 + R1/R2). However, the MAX6472TA28BD3+T is factory-configured for fixed 2.8V operation, so SET must be grounded unless reconfigured externally.
What is the maximum input voltage rating for the MAX6472TA28BD3+T?
The absolute maximum input voltage for the MAX6472TA28BD3+T is +7V, as specified in the Absolute Maximum Ratings table. However, the recommended operating input voltage range is 2.5V to 5.5V. Exceeding 5.5V may cause excessive power dissipation or thermal shutdown, and operation above 7V risks permanent damage to the IN, SHDN, OUT, and FB pins.
How does the MAX6472TA28BD3+T handle reverse current flow from OUT to IN?
The MAX6472TA28BD3+T includes reverse-current protection that limits OUT-to-IN leakage to 0.01µA typical when VOUT > VIN. This prevents backfeeding into a depleted battery source and avoids unintended power-up of upstream circuitry. The protection activates automatically and requires no external components - a key reliability feature for battery-swappable devices.
Is the RESET output of the MAX6472TA28BD3+T push-pull or open-drain?
The RESET output of the MAX6472TA28BD3+T is open-drain, as indicated by the "D" suffix in the part number (MAX6472TA28BD3+T) and confirmed in the Pin Description section for MAX6471/MAX6472. It sinks up to 3.2mA at 0.4V and requires an external pullup resistor to the host supply rail (e.g., 10kΩ to 3.3V) to generate a valid logic-high level for microprocessor reset inputs.
MAX6472TA28BD3+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-WDFN Exposed Pad
- Packaging:
- Bulk
- Product Status:
- Active
- 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-EP (3x3)
MAX6472TA28BD3+T FAQ
1.How can I place an order for MAX6472TA28BD3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6472TA28BD3+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 MAX6472TA28BD3+T reliable?
The price and inventory of MAX6472TA28BD3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6472TA28BD3+T is usually 5 days.
3.What payment methods are accepted for MAX6472TA28BD3+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6472TA28BD3+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6472TA28BD3+T?
MAX6472TA28BD3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6472TA28BD3+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 MAX6472TA28BD3+T?
For technical support, including MAX6472TA28BD3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6472TA28BD3+T requirements.
6.How does Aetrix verify that MAX6472TA28BD3+T is sourced from the original manufacturer or authorized distributors?
All MAX6472TA28BD3+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 MAX6472TA28BD3+T meets industry standards.
7.What is the process for return or replacement of MAX6472TA28BD3+T?
All MAX6472TA28BD3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6472TA28BD3+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 MAX6472TA28BD3+T part is unused and in its original packaging.
Return procedure for MAX6472TA28BD3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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