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Analog Devices Inc./Maxim Integrated MAX6470TA28AD3+
- Part No.:
- MAX6470TA28AD3+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-WDFN Exposed Pad
- Datasheet:
-
MAX6470TA28AD3+.pdf
- Description:
- IC REG LIN POS ADJ 300MA 8TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,411
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Product details
Overview
MAX6470TA28AD3+ from Maxim Integrated is a 300mA low-dropout linear regulator with integrated microprocessor reset circuit, fixed 2.8V output, ±2.0% output voltage accuracy over temperature, 114mV dropout at 300mA load, and 150ms minimum reset timeout. It delivers stable power and reliable system initialization for portable battery-powered microprocessor systems.
For engineers reviewing the MAX6470TA28AD3+ datasheet, MAX6470TA28AD3+ pinout, MAX6470TA28AD3+ application, or MAX6470TA28AD3+ equivalent, this device supports critical low-power design requirements including shutdown current as low as 0.1µA (typ), reverse current protection, thermal/short-circuit protection, and precise reset assertion during brownout or startup.
Technical Context
The MAX6470TA28AD3+ integrates a precision LDO regulator core with a fully self-contained reset supervisor using a shared reference. Its reset threshold is -7.5% of nominal VOUT (i.e., 2.61V for 2.8V output), with a guaranteed 150ms minimum timeout period after recovery. The device uses an active-low SHDN input to disable regulation and reduce supply current to 0.1µA.
It operates across 2.5V–5.5V input range, supports 300mA continuous output, and features internal reverse-current blocking (0.01µA typ OUT→IN leakage). The regulator employs a PMOS pass transistor architecture enabling low dropout and no external compensation.
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 within microprocessor tolerance bands. |
| Max Output Current | 300mA guaranteed - sufficient to power mid-tier microcontrollers, RF transceivers, or sensor subsystems. |
| Dropout Voltage | 114mV at 300mA - enables operation down to VIN = 2.914V while maintaining regulated 2.8V output. |
| Supply Current | 82µA typical - minimizes quiescent drain in always-on battery backup or sleep-mode applications. |
| Shutdown Current | 0.1µA typical - reduces system standby power to nanoampere levels when disabled via SHDN. |
| Reset Timeout | 150ms minimum - provides adequate stabilization time for clock oscillators and memory before processor release. |
| Reset Threshold | -7.5% of VOUT (2.61V) - asserts RESET early enough to prevent invalid CPU execution during brownout. |
Pinout & Package
MAX6470TA28AD3+ is housed in an 8-pin TDFN-EP package (3mm × 3mm, 0.5mm pitch) with exposed paddle thermally connected to GND. Pin 1 is IN; Pin 2 is GND; Pin 3 is SHDN; Pin 4 is RESET; Pin 5 is SET; Pin 6 is OUT; Pins 7–8 are unused (NC); EP is internally tied to GND and must be soldered to PCB ground plane for thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN) | Regulator input | Accepts 2.5V–5.5V input; requires 0.1µF bypass to GND for stability and noise rejection. |
| 2 (GND) | Ground / thermal pad | 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 VIN for normal operation. |
| 4 (RESET) | Active-low reset output | Push-pull configuration; asserts low during power-up, brownout, or SHDN activation for ≥150ms. |
| 5 (SET) | Feedback reference input | Connected to GND for fixed 2.8V output; left floating or externally biased only if adjustable mode used. |
| 6 (OUT) | Regulated output | Delivers up to 300mA at 2.8V; requires ≥3.3µF low-ESR ceramic capacitor to GND for loop stability. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated microprocessor reset | Eliminates need for external supervisor IC; guarantees reset assertion during power-up, brownout, and shutdown. |
| Low-quiescent-current shutdown | 0.1µA shutdown current enables multi-year battery life in maintenance-free IoT endpoints. |
| Reverse current protection | 0.01µA max OUT→IN leakage prevents backfeeding into depleted batteries or isolated power domains. |
| Thermal & short-circuit protection | Auto-shutdown at 180°C junction temp with 20°C hysteresis; 450mA min current limit prevents damage under fault. |
| Input voltage range | 2.5V–5.5V operation supports single-cell Li-ion, 2–3 alkaline, or USB-powered designs without pre-regulation. |
Applications
| Handheld Instruments | Bluetooth Modules |
|---|---|
|
Use Scenario: Powering ARM Cortex-M based data loggers in field-deployed PDAs with coin-cell or LiPo backup. IC Role / Device Role / Timing Role: Primary 2.8V supply for MCU core and ADC, with synchronized reset assertion before firmware execution. Use Value: 82µA quiescent current extends battery runtime; 150ms reset timeout ensures crystal oscillator stabilization prior to boot. |
Use Scenario: Supplying 2.8V to Bluetooth 5.0 SoC (e.g., nRF52840) in wearables with aggressive sleep cycling. IC Role / Device Role / Timing Role: Regulator and reset source for radio subsystem; SHDN pin controlled by host MCU to gate power during deep sleep. Use Value: 0.1µA shutdown current eliminates parasitic drain; push-pull RESET directly drives SoC's nRESET pin without pull-up. |
| Notebook Subsystems | USB Peripheral Devices |
|
Use Scenario: Providing auxiliary 2.8V rail for embedded controller (EC) or touchpad ASIC in ultrabooks. IC Role / Device Role / Timing Role: Independent LDO with dedicated reset signaling to EC during main 3.3V rail sequencing. Use Value: -7.5% reset threshold detects marginal VDD drops before EC lockup; TDFN package saves space on dense motherboard layouts. |
Use Scenario: Powering USB-C audio adapters or HID dongles requiring clean 2.8V for DAC and USB PHY. IC Role / Device Role / Timing Role: Local regulation from 5V USB bus; RESET output coordinates USB enumeration timing with power-good status. Use Value: 114mV dropout allows full 2.8V delivery even as USB port voltage sags to 4.75V; reverse leakage protection isolates DAC from bus transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO-with-reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS74201RGWT | 200mA output, no integrated reset, requires external supervisor; 17µV RMS noise vs. 75µVRMS (MAX6477–84 only). | Lacks built-in reset - adds BOM cost and board area; suitable only where reset logic is already centralized. | Select when ultra-low noise is prioritized over integration and shutdown current. |
| ADM6315-28D3ARTZ-RL | Separate 2.8V reset monitor IC (no LDO); 1.6µA supply current; 200ms timeout; no shutdown or current capability. | Requires companion LDO (e.g., ADM7172); increases component count and power path complexity. | Choose only when discrete reset timing adjustment or higher accuracy (-2.5% threshold) is required. |
Compared with TPS74201RGWT and ADM6315-28D3ARTZ-RL, MAX6470TA28AD3+ uniquely combines 300mA LDO regulation, integrated -7.5% reset with 150ms timeout, and 0.1µA shutdown in a single 8-pin TDFN - reducing solution size, BOM count, and standby power in space-constrained portable designs.
Availability
MAX6470TA28AD3+ is available at Aetrix Electronics and suitable for handheld instruments, Bluetooth modules, notebook subsystems, and USB peripheral devices requiring stable component supply with long-term lifecycle support.
Supply support for MAX6470TA28AD3+ 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 in demanding environments.
The MAX6469–MAX6484 product line targets battery-powered portable electronics requiring tightly regulated voltage, ultra-low quiescent current, and deterministic power-on reset behavior - especially where PCB area and BOM simplification are critical.
FAQ
What is the output voltage tolerance of the MAX6470TA28AD3+ over temperature?
The MAX6470TA28AD3+ maintains ±2.0% output voltage accuracy across the full operating temperature range of -40°C to +85°C. This specification applies to fixed-output operation with SET tied to GND and ensures reliable operation for microprocessors and peripherals with tight supply voltage windows. The 2.8V nominal output remains within 2.744V to 2.856V under all specified conditions, as confirmed in the Electrical Characteristics table of the official datasheet.
Does the MAX6470TA28AD3+ include reverse current protection?
Yes, the MAX6470TA28AD3+ includes integrated reverse current protection that limits OUT-to-IN leakage to 0.01µA typical when VOUT > VIN. This feature prevents backfeeding into a depleted battery or isolated power domain, making it suitable for applications with backup capacitors or dual-supply configurations. The protection is implemented via internal circuitry that disables the pass transistor and parasitic paths when output voltage exceeds input voltage.
What is the function of the SET pin on the MAX6470TA28AD3+?
On the MAX6470TA28AD3+, the SET pin is configured for fixed-output operation and must be connected to GND to select the preset 2.8V output. It is not used for adjustment in this variant - unlike MAX6469/MAX6471 series members with adjustable capability. Leaving SET floating or applying bias will cause undefined regulation behavior. The device's dual-mode architecture automatically detects GND connection and engages internal feedback resistors to deliver the rated 2.8V output.
How does the reset timeout period work on the MAX6470TA28AD3+?
The MAX6470TA28AD3+ provides a fixed 150ms minimum reset timeout period (denoted by suffix "D3") after VOUT rises above the -7.5% reset threshold (2.61V). RESET remains asserted low for at least 150ms following recovery, ensuring clocks and memory stabilize before processor release. This timeout is factory-programmed and non-adjustable; it begins timing once VOUT crosses the threshold and is independent of input voltage slew rate or load transient behavior.
Can the MAX6470TA28AD3+ be used in thermal-limited PCB layouts?
Yes, the MAX6470TA28AD3+ supports thermal-limited layouts through its 8-pin TDFN-EP package with exposed paddle. When the EP is soldered to a ≥100mm² PCB ground plane, thermal resistance drops to 41°C/W (θJC), enabling continuous 300mA operation at ambient temperatures up to +70°C. Derating is required above +70°C per the datasheet's 24.4mW/°C derating factor. Avoid hand-soldering - reflow must follow JEDEC J-STD-020A profile due to UCSP-related thermal constraints in related variants (not applicable to MAX6470).
MAX6470TA28AD3+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-WDFN Exposed Pad
- Packaging:
- Bulk
- 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-EP (3x3)
MAX6470TA28AD3+ FAQ
1.How can I place an order for MAX6470TA28AD3+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6470TA28AD3+ 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 MAX6470TA28AD3+ reliable?
The price and inventory of MAX6470TA28AD3+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6470TA28AD3+ is usually 5 days.
3.What payment methods are accepted for MAX6470TA28AD3+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6470TA28AD3+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6470TA28AD3+?
MAX6470TA28AD3+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6470TA28AD3+ 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 MAX6470TA28AD3+?
For technical support, including MAX6470TA28AD3+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6470TA28AD3+ requirements.
6.How does Aetrix verify that MAX6470TA28AD3+ is sourced from the original manufacturer or authorized distributors?
All MAX6470TA28AD3+ 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 MAX6470TA28AD3+ meets industry standards.
7.What is the process for return or replacement of MAX6470TA28AD3+?
All MAX6470TA28AD3+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6470TA28AD3+, 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 MAX6470TA28AD3+ part is unused and in its original packaging.
Return procedure for MAX6470TA28AD3+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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