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Analog Devices Inc./Maxim Integrated MAX6469UT28AD1-T
- Part No.:
- MAX6469UT28AD1-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SOT-23-6
- Datasheet:
-
MAX6469UT28AD1-T.pdf
- Description:
- IC REG LINEAR LDO WITH MPU RESET
- Quantity:
- Payment:
- Shipping:
Inventory:5,000
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Product details
Overview
The MAX6469UT28AD1-T from Maxim Integrated is a 300mA low-dropout linear regulator with integrated microprocessor reset circuit, preset 2.8V output, active-low push-pull RESET, -7.5% reset threshold, and 2.5ms minimum reset timeout. It operates from 2.5V to 5.5V input, delivers ±2.0% output accuracy over temperature, and consumes only 82µA quiescent current - ideal for battery-powered portable systems requiring reliable power sequencing and brownout protection.
For engineers reviewing the MAX6469UT28AD1-T datasheet, MAX6469UT28AD1-T pinout, MAX6469UT28AD1-T application, or MAX6469UT28AD1-T equivalent, this device serves as a compact, single-chip solution for powering microprocessors in space-constrained, low-power embedded designs where supply stability, fast startup, and deterministic reset timing are critical.
Technical Context
The MAX6469UT28AD1-T integrates a precision LDO regulator core with a fully self-contained reset supervisor using a shared voltage reference. Its regulator features dual-mode feedback (via SET pin) but operates in fixed-output mode when SET is grounded - confirmed for this part number by its "UT" prefix (SOT23-6 package) and "28" suffix (2.8V output). The reset circuit asserts active-low RESET during VIN undervoltage lockout (2.47V typ), VOUT dropout below –7.5% of 2.8V (i.e., 2.596V), and shutdown activation.
This variant includes active-low SHDN control (not MR or FB), push-pull RESET output, and reverse current protection (0.01µA OUT→IN leakage). It guarantees 300mA output with 55mV dropout at 150mA and 114mV at 300mA under 2.8V output conditions - enabling stable operation near battery end-of-life in handheld instruments and wireless modules.
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 without external feedback components. |
| Max Output Current | 300mA guaranteed - sufficient to power mid-tier ARM Cortex-M MCUs, Bluetooth SoCs, or sensor hubs without thermal derating in SOT23-6. |
| Dropout Voltage | 114mV at 300mA load - enables regulation down to ~2.686V input, supporting single-cell Li-ion (2.7–4.2V) or triple-alkaline (3.0–4.5V) operation. |
| Quiescent Current | 82µA typical - extends battery life in always-on monitoring applications; drops to 0.1µA in shutdown mode. |
| Reset Threshold | –7.5% of 2.8V = 2.596V (min assertion) - aligns with standard µP supply tolerance requirements and eliminates need for external supervisor IC. |
| Reset Timeout | 2.5ms minimum - provides sufficient hold-off for clock oscillator stabilization and processor internal reset completion before release. |
| Input Voltage Range | 2.5V to 5.5V - compatible with common battery chemistries and intermediate rail supplies in portable electronics. |
Pinout & Package
MAX6469UT28AD1-T is housed in a 6-pin SOT23-6 package with exposed pad not present (TDFN variants use EP; SOT23 does not). Pin 1 is IN, Pin 2 is GND, Pin 3 is SHDN, Pin 4 is RESET, Pin 5 is SET, Pin 6 is OUT. All pins are surface-mount compatible with standard reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN) | Regulator input supply | Accepts 2.5–5.5V input; requires 0.1µF ceramic bypass to GND for stability and noise rejection. |
| 2 (GND) | Power and thermal ground | Primary return path; must be connected to large PCB copper area to dissipate heat and minimize ground bounce. |
| 3 (SHDN) | Active-low shutdown control | Pulling low disables regulator and reduces supply current to 0.1µA; connect to VIN for normal operation. |
| 4 (RESET) | Active-low push-pull reset output | Drives µP reset pin directly; asserts low during power-up, brownout, or SHDN activation; no external pullup required. |
| 5 (SET) | Feedback configuration selector | Grounded for fixed 2.8V output; floating or externally biased for adjustable mode - unused here per part number decoding. |
| 6 (OUT) | Regulated output | Delivers 2.8V @ up to 300mA; requires ≥3.3µF low-ESR ceramic capacitor to GND for transient response and stability. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated reset supervisor | Eliminates discrete supervisor IC and associated BOM cost; uses same reference as LDO for matched temperature drift and accuracy. |
| Low 82µA quiescent current | Enables >1-year battery life in coin-cell–powered devices drawing <10µA average system current. |
| Reverse current protection | 0.01µA max OUT→IN leakage prevents backup capacitor or battery from back-feeding into depleted main supply. |
| Thermal and short-circuit protection | Shuts down at 180°C junction temp with 20°C hysteresis; survives indefinite output short to GND without damage. |
| Guaranteed 300mA output | Validated across full temperature range and input voltage span - removes design margin uncertainty in production validation. |
Applications
| Handheld Medical Instruments | USB-Powered Sensor Modules |
|---|---|
|
Use Scenario: Portable blood glucose meters powered by single AAA alkaline cells (3.0–4.5V), requiring stable 2.8V supply for ADC, display driver, and BLE radio during intermittent measurement cycles. IC Role / Device Role / Timing Role: Primary power regulator and system reset sequencer - ensures µC resets cleanly after battery insertion and holds reset until 2.8V stabilizes within ±2% and clock is ready. Use Value: 2.5ms reset timeout matches typical crystal oscillator start time; 114mV dropout allows operation down to 2.686V, extending usable battery life by ~18% versus higher-dropout alternatives. |
Use Scenario: Industrial temperature/humidity sensor node connected via USB-C port, drawing burst current from 5V bus while maintaining isolated 2.8V logic rail for low-power MCU and analog front-end. IC Role / Device Role / Timing Role: Local LDO with integrated reset - decouples sensor subsystem from host USB voltage ripple and asserts RESET if VBUS dips below 4.5V or local 2.8V sags due to load transients. Use Value: 82µA IQ minimizes standby drain on USB suspend power budget; push-pull RESET drives host-compatible reset signaling without pullup resistor. |
| Bluetooth Audio Accessories | PCMCIA Memory Cards |
|
Use Scenario: True wireless stereo (TWS) earbud charging case with embedded MCU managing battery charging, status LEDs, and Bluetooth pairing - powered by 3.7V Li-ion cell. IC Role / Device Role / Timing Role: Secondary regulated rail generator - supplies clean 2.8V to Bluetooth SoC during RF transmission bursts, with RESET ensuring firmware reload if voltage collapses during high-current charge pulses. Use Value: 55mV dropout at 150mA enables stable 2.8V delivery even as cell voltage drops to 2.75V; SHDN pin allows MCU to disable rail during deep sleep, cutting system IQ to sub-µA levels. |
Use Scenario: CompactFlash or SDIO memory card with embedded controller requiring precise 2.8V I/O supply and deterministic power-on reset sequence compliant with PCMCIA specification. IC Role / Device Role / Timing Role: Dedicated I/O voltage regulator and compliance reset generator - meets JEDEC JESD84-B51 requirement for 2.8V ±5% supply and 10ms–100ms reset pulse width. Use Value: Fixed 2.8V output eliminates external resistor network; ±2.0% accuracy over temperature satisfies Class A memory timing margins; 2.5ms timeout is programmable to meet exact spec via part number selection. |
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 200mA, no integrated reset - requires external supervisor (e.g., TPS3808G01) for reset functionality. | Lacks monolithic reset integration; suitable only where board space permits two ICs and timing coordination is handled externally. | Select only if lower cost outweighs added complexity and footprint; verify external supervisor reset threshold matches 2.8V ±7.5%. |
| NCP302LSQ28T2G | 300mA output, 150mV dropout at 300mA, open-drain RESET (requires pullup), -12.5% reset threshold (3.08V → 2.695V trip). | Higher dropout limits usable input range; open-drain RESET adds component count; -12.5% threshold may assert too early in marginal 2.8V systems. | Prefer only if system tolerates earlier reset assertion and can accommodate external pullup; confirm thermal performance in SOT23-6 layout. |
Compared with TPS76328QDBVRQ1 and NCP302LSQ28T2G, the MAX6469UT28AD1-T uniquely combines 300mA drive, ultra-low IQ, monolithic reset with push-pull output, and precise –7.5% threshold - delivering higher integration, tighter voltage margining, and simpler layout in battery-critical portable designs.
Availability
MAX6469UT28AD1-T is available at Aetrix Electronics and suitable for handheld medical instruments, USB-powered sensor modules, Bluetooth audio accessories, and PCMCIA memory cards requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX6469UT28AD1-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 industrial, automotive, and consumer applications.
The MAX6469–MAX6484 product line was designed specifically for battery-powered portable electronics needing integrated power regulation and microprocessor supervision in minimal footprint - emphasizing ultra-low quiescent current, accurate reset thresholds, and robust protection features.
FAQ
What output voltage does the MAX6469UT28AD1-T deliver?
The MAX6469UT28AD1-T delivers a fixed 2.8V output with ±2.0% accuracy over the full –40°C to +85°C operating temperature range. This value is factory-trimmed and does not require external resistors - the "28" in the part number explicitly denotes the 2.8V output voltage setting per Maxim's ordering guide.
Does the MAX6469UT28AD1-T include a shutdown function?
Yes, the MAX6469UT28AD1-T includes an active-low SHDN pin (Pin 3). When pulled low, it disables the regulator and reduces total supply current to 0.1µA (typical), making it suitable for ultra-low-power sleep modes. During normal operation, SHDN must be tied to VIN or a logic-high voltage ≥0.7×VIN.
What type of RESET output does the MAX6469UT28AD1-T provide?
The MAX6469UT28AD1-T provides an active-low push-pull RESET output (Pin 4). It actively drives low during reset conditions and actively drives high when deasserted - eliminating the need for an external pullup resistor and ensuring fast, deterministic reset signal edges for microprocessor interfaces.
What is the reset timeout period for the MAX6469UT28AD1-T?
The MAX6469UT28AD1-T has a 2.5ms minimum reset timeout period, indicated by the "D1" suffix in the part number. This duration begins after VOUT rises above the –7.5% threshold (2.596V) and ensures the microprocessor remains held in reset long enough for internal clocks and peripherals to stabilize before execution resumes.
Is the MAX6469UT28AD1-T compatible with lead-free soldering processes?
Yes, the MAX6469UT28AD1-T is offered in RoHS-compliant, lead(Pb)-free packaging. It supports standard lead-free reflow profiles per JEDEC J-STD-020, with peak temperature up to +260°C. The SOT23-6 package is qualified for both IR/convection reflow and hand-soldering methods.
MAX6469UT28AD1-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-6
- 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:
- SOT-23-6
MAX6469UT28AD1-T FAQ
1.How can I place an order for MAX6469UT28AD1-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6469UT28AD1-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 MAX6469UT28AD1-T reliable?
The price and inventory of MAX6469UT28AD1-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6469UT28AD1-T is usually 5 days.
3.What payment methods are accepted for MAX6469UT28AD1-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6469UT28AD1-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6469UT28AD1-T?
MAX6469UT28AD1-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6469UT28AD1-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 MAX6469UT28AD1-T?
For technical support, including MAX6469UT28AD1-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6469UT28AD1-T requirements.
6.How does Aetrix verify that MAX6469UT28AD1-T is sourced from the original manufacturer or authorized distributors?
All MAX6469UT28AD1-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 MAX6469UT28AD1-T meets industry standards.
7.What is the process for return or replacement of MAX6469UT28AD1-T?
All MAX6469UT28AD1-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6469UT28AD1-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 MAX6469UT28AD1-T part is unused and in its original packaging.
Return procedure for MAX6469UT28AD1-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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