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Analog Devices Inc./Maxim Integrated MAX6474TA33BD3-T
- Part No.:
- MAX6474TA33BD3-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-WDFN Exposed Pad
- Datasheet:
-
MAX6474TA33BD3-T.pdf
- Description:
- IC REG LINEAR LDO WITH MPU RESET
- Quantity:
- Payment:
- Shipping:
Inventory:5,000
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Product details
Overview
MAX6474TA33BD3-T from Maxim Integrated is a 300mA low-dropout linear regulator with integrated microprocessor reset circuit, fixed 3.3V output, -12.5% reset threshold accuracy, and 150ms minimum reset timeout. It features active-low shutdown (SHDN), manual reset input (MR), and operates from 2.5V to 5.5V input. Designed for battery-powered portable electronics requiring reliable power sequencing and brownout protection.
For engineers reviewing the MAX6474TA33BD3-T datasheet, MAX6474TA33BD3-T pinout, MAX6474TA33BD3-T application, or MAX6474TA33BD3-T equivalent, this device delivers verified 3.3V regulation with ±2.0% output accuracy over temperature, 114mV dropout at 300mA, 82µA quiescent current, and integrated MR/RESET supervision - critical for handheld instruments, Bluetooth modules, and USB devices where supply stability and controlled startup are mandatory.
Technical Context
The MAX6474TA33BD3-T implements a dual-function LDO core with an independent reset supervisor sharing the same voltage reference. Its regulator uses a PMOS pass transistor enabling low dropout and reverse current blocking, while the reset circuit monitors VOUT against a -12.5% threshold and asserts active-low RESET for ≥150ms after recovery. The MR pin provides asynchronous reset assertion even when VOUT is in specification.
This variant belongs to the MAX6471–MAX6474 subfamily: it includes SHDN and MR pins (pins 3 and 5 respectively), uses fixed-output configuration (SET tied to GND), and is packaged in 8-pin TDFN-EP. It does not support remote sense (no FB pin) or adjustable output, distinguishing it from MAX6475/MAX6476 variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed +3.3V - eliminates external feedback resistors and ensures stable rail for 3.3V microcontrollers and peripherals. |
| Max Output Current | 300mA guaranteed - sufficient to power baseband processors, RF transceivers, or multiple logic ICs in portable systems. |
| Dropout Voltage | 114mV at 300mA - enables operation down to VIN = 3.414V, extending battery runtime in single-cell Li-ion or 3× alkaline applications. |
| Supply Current | 82µA typical - minimizes standby drain; drops to 0.1µA in shutdown mode for ultra-low-power sleep states. |
| Reset Threshold | -12.5% of VOUT (i.e., 2.8875V) - tight tolerance ensures early detection of brownout before µP malfunction occurs. |
| Reset Timeout | 150ms minimum - satisfies boot timing requirements of ARM Cortex-M and similar embedded processors. |
| Operating Temp | -40°C to +85°C - qualified for industrial and extended-temperature consumer environments including automotive infotainment accessories. |
Pinout & Package
MAX6474TA33BD3-T is housed in an 8-pin TDFN-EP (3mm × 3mm, 0.5mm pitch) package with exposed thermal pad (EP) internally connected to GND. The EP must be soldered to a PCB ground plane for thermal management and electrical stability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN) | Regulator Input | Accepts 2.5V–5.5V supply; requires 0.1µF ceramic bypass to GND for stability and noise rejection. |
| 2 (GND) | Ground / Thermal Pad Anchor | Primary return path and thermal conduction node; must connect to large copper area for junction temperature control. |
| 3 (SHDN) | Active-Low Shutdown Control | Pulling low disables regulator output and reduces supply current to ≤1µA; internal pullup absent - external bias required if unused. |
| 4 (RESET) | Active-Low Reset Output | Push-pull configuration; asserts low during power-up, brownout, or MR activation; holds low for ≥150ms post-recovery. |
| 5 (MR) | Active-Low Manual Reset Input | Asserts RESET asynchronously while pulled low; internal 40kΩ pullup to VOUT - enables momentary switch-to-ground implementation without external components. |
| 6 (SET) | Feedback Reference Select | Tied to GND for fixed 3.3V operation; floating or externally biased only for adjustable mode (not used in this variant). |
| 7,8 (OUT) | Regulated Output | Delivers 3.3V @ up to 300mA; requires ≥3.3µF low-ESR ceramic capacitor at output for transient response and stability. |
| EP | Exposed Thermal Pad | Internally connected to GND; mandatory connection to PCB ground plane for thermal dissipation and EMI reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Microprocessor Reset | Eliminates need for discrete supervisor IC; guarantees synchronized power-on reset and brownout recovery with programmable 150ms hold time. |
| Manual Reset Input (MR) | Enables hardware-initiated system reset without cycling power - essential for field service, test modes, and watchdog recovery in embedded firmware. |
| Reverse Current Protection | 0.01µA typical OUT→IN leakage prevents backup battery discharge or unintended backfeeding when main supply is removed. |
| Thermal & Short-Circuit Protection | Shuts down at +180°C junction temp with 20°C hysteresis; survives indefinite output short to GND without damage. |
| Low Dropout Architecture | PMOS-based design achieves 114mV dropout at full 300mA load - maximizes usable battery voltage range in space-constrained portable designs. |
Applications
| Handheld Instruments | Bluetooth Modules |
|---|---|
Use Scenario: Powering ARM-based data loggers with LCD, SD card, and sensor interfaces in field-deployed PDAs. IC Role / Device Role: Primary 3.3V supply regulator with integrated reset supervision ensuring deterministic boot after battery insertion or low-voltage recovery. Use Value: 82µA quiescent current extends shelf life; MR pin allows technician-triggered calibration reset without power cycle. |
Use Scenario: Supplying baseband controller and BLE radio in compact wireless earbud charging cases. IC Role / Device Role: Single-chip 3.3V LDO + reset generator eliminating discrete supervisor and reducing BOM count by two components. Use Value: 150ms reset timeout meets Nordic nRF52832 boot timing; TDFN-EP package fits <5mm² board area constraints. |
| USB Peripheral Devices | Notebook Subsystems |
Use Scenario: Regulating bus-powered USB audio adapters with FPGA logic and DACs. IC Role / Device Role: Stable 3.3V rail generator with brownout detection preventing USB enumeration failure during host port voltage sag. Use Value: -12.5% reset threshold triggers before USB spec's 4.75V min, avoiding communication lockup during transient dips. |
Use Scenario: Powering embedded controller (EC) and keyboard backlight driver in ultrabook lid assemblies. IC Role / Device Role: Secondary LDO supplying always-on domain with manual reset capability for EC firmware updates. Use Value: SHDN pin enables dynamic power gating during sleep; MR supports hot-key initiated EC reset without main CPU involvement. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO-with-reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS76333QDBVRQ1 | 300mA LDO with 3.3V fixed output and active-low reset, but no MR pin; 120ms reset timeout; AEC-Q100 qualified. | Suitable for automotive body electronics where MR is unnecessary but qualification is mandatory. | Select when automotive qualification outweighs need for manual reset functionality. |
| ADM6315-33D3ARTZ-RL | Standalone reset supervisor (no LDO); 3.3V supply monitor with 140ms timeout; 1.6µA quiescent current. | Requires external LDO; lower IQ but adds component count and board area. | Select when system already includes a high-performance LDO and only reset supervision is needed. |
Compared with TPS76333QDBVRQ1 and ADM6315-33D3ARTZ-RL, MAX6474TA33BD3-T uniquely integrates MR functionality and matches 3.3V/300mA/150ms requirements in a single TDFN package - reducing solution size and enabling field-serviceable reset without redesign.
Availability
MAX6474TA33BD3-T is available at Aetrix Electronics and suitable for handheld instruments, Bluetooth modules, USB peripheral devices, notebook subsystems, and portable medical sensors requiring stable component supply across production lifecycles.
Supply support for MAX6474TA33BD3-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 MAX6469–MAX6484 family was engineered specifically for battery-powered portable equipment needing combined LDO regulation and microprocessor reset in minimal footprint - targeting PDA, USB, and wireless module designers.
FAQ
What is the function of the MR pin on the MAX6474TA33BD3-T?
The MR (Manual Reset) pin on the MAX6474TA33BD3-T is an active-low input that forces the RESET output low when asserted, regardless of VOUT status. It remains asserted for the full 150ms reset timeout period after MR returns high. The pin features a 40kΩ internal pullup to VOUT, enabling direct connection to a normally-open switch for field-service reset without external components. This behavior is confirmed in the MAX6474TA33BD3-T's pin description and functional diagram.
Does the MAX6474TA33BD3-T support adjustable output voltage?
No, the MAX6474TA33BD3-T does not support adjustable output voltage. It is configured for fixed 3.3V output via internal resistor dividers, with the SET pin intended to be tied to GND. Adjustable operation requires variants like MAX6475/MAX6476 with FB pin and external feedback network - a distinction explicitly stated in the "Detailed Description" and pin function tables for MAX6474TA33BD3-T.
What is the maximum input voltage rating for the MAX6474TA33BD3-T?
The MAX6474TA33BD3-T has an absolute maximum input voltage rating of +7V on the IN pin, as specified in the Absolute Maximum Ratings table. However, its operational input voltage range is limited to 2.5V to 5.5V per the Electrical Characteristics section - exceeding 5.5V may cause undefined behavior or damage despite the higher absolute limit. This 2.5V–5.5V window ensures proper LDO regulation and reset circuit accuracy.
How does the MAX6474TA33BD3-T handle reverse current flow from OUT to IN?
The MAX6474TA33BD3-T incorporates reverse current protection that limits OUT-to-IN leakage to 0.01µA typical when VOUT > VIN. This prevents backup batteries or supercapacitors connected at OUT from discharging into a removed or depleted main supply. The protection is implemented via internal circuitry that disables the pass transistor and parasitic diode path - a feature validated in the "Reverse Leakage Protection" section and confirmed by measured leakage data in the Electrical Characteristics table.
Is the RESET output of the MAX6474TA33BD3-T push-pull or open-drain?
According to the Ordering Information table and Pin Descriptions, the MAX6474TA33BD3-T features a push-pull RESET output. This is indicated by the "A" suffix in the reset threshold code (the "A" in "BD3" denotes -7.5% or -12.5% threshold, and the device family documentation confirms push-pull configuration for all "A"-suffixed parts unless otherwise specified). Push-pull operation means RESET actively drives high when deasserted, eliminating the need for an external pullup resistor.
MAX6474TA33BD3-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 (3.3V)
- Voltage - Output (Max):
- 5.5V
- Voltage Dropout (Max):
- 0.18V @ 300mA
- Current - Output:
- 300mA
- Current - Quiescent (Iq):
- 136 µA
- Current - Supply (Max):
- 96 µA
- PSRR:
- -
- Control Features:
- Manual Reset, 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)
MAX6474TA33BD3-T FAQ
1.How can I place an order for MAX6474TA33BD3-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6474TA33BD3-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 MAX6474TA33BD3-T reliable?
The price and inventory of MAX6474TA33BD3-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6474TA33BD3-T is usually 5 days.
3.What payment methods are accepted for MAX6474TA33BD3-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6474TA33BD3-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6474TA33BD3-T?
MAX6474TA33BD3-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6474TA33BD3-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 MAX6474TA33BD3-T?
For technical support, including MAX6474TA33BD3-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6474TA33BD3-T requirements.
6.How does Aetrix verify that MAX6474TA33BD3-T is sourced from the original manufacturer or authorized distributors?
All MAX6474TA33BD3-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 MAX6474TA33BD3-T meets industry standards.
7.What is the process for return or replacement of MAX6474TA33BD3-T?
All MAX6474TA33BD3-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6474TA33BD3-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 MAX6474TA33BD3-T part is unused and in its original packaging.
Return procedure for MAX6474TA33BD3-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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