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Analog Devices Inc./Maxim Integrated MAX6477BL18AD3
- Part No.:
- MAX6477BL18AD3
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 6-UFBGA, CSPBGA
- Datasheet:
-
MAX6477BL18AD3.pdf
- Description:
- IC REG LINEAR LDO WITH MPU RESET
- Quantity:
- Payment:
- Shipping:
Inventory:269
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Product details
Overview
MAX6477BL18AD3 from Maxim Integrated is a 300mA low-dropout linear regulator with integrated microprocessor reset circuit, fixed 1.8V output, −12.5% reset threshold accuracy, and 150ms minimum reset timeout. It features 75µVRMS output noise, ±2.0% output voltage accuracy over temperature, and 82µA quiescent current. Designed for battery-powered portable equipment requiring stable low-noise supply and reliable power-on reset.
For engineers reviewing the MAX6477BL18AD3 datasheet, MAX6477BL18AD3 pinout, MAX6477BL18AD3 application, or MAX6477BL18AD3 equivalent, this device delivers verified 300mA LDO regulation with factory-trimmed 1.8V output, UCSP package thermal performance, active-low push-pull or open-drain RESET, shutdown control, and remote sense capability - all in a 3×3mm chip-scale package.
Technical Context
The MAX6477BL18AD3 implements a precision bandgap-referenced LDO core with dual-mode feedback (fixed via internal resistors or adjustable via external SET resistor network), and shares the same reference for both regulation and reset monitoring. Its reset circuit asserts active-low RESET when VOUT falls below 87.5% of nominal (−12.5% tolerance) and holds RESET for ≥150ms after recovery.
This variant belongs to the MAX6477–MAX6484 subfamily featuring UCSP packaging, remote feedback (FB) pin instead of SET, and optimized 75µVRMS noise performance. It includes input reverse-current protection (0.01µA typ OUT→IN leakage), thermal shutdown at +180°C with 20°C hysteresis, and guaranteed 450mA current limit.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8V ±2.0% over −40°C to +85°C - ensures stable core logic supply for low-voltage microcontrollers. |
| Max Output Current | 300mA guaranteed - sufficient for single-core MCUs, Bluetooth baseband, or sensor hubs without external pass devices. |
| Dropout Voltage | 114mV at 300mA load - enables operation from 1.914V input, supporting single-cell Li-ion or 2-cell alkaline systems. |
| Quiescent Current | 82µA typical - extends battery life in always-on monitoring applications such as wearable health sensors. |
| Reset Threshold | −12.5% of VOUT (i.e., 1.575V for 1.8V output) - meets stringent microprocessor brownout detection requirements. |
| Reset Timeout | 150ms minimum - provides adequate stabilization time for clock oscillators and memory initialization before processor release. |
| Output Noise | 75µVRMS (10Hz–100kHz) - minimizes jitter in RF transceivers and ADC reference paths. |
| Package | 3×3mm UCSP (chip-scale package) - enables ultra-compact PCB layouts in space-constrained portable designs. |
Pinout & Package
MAX6477BL18AD3 is housed in a 6-bump UCSP (Ultra Compact Silicon Package) with exposed die pad thermally connected to GND. The package measures 3.0mm × 3.0mm × 0.6mm and is JEDEC J-STD-020A reflow compatible only - hand/wave soldering prohibited.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN | Regulator Input | Bypassed to GND with 0.1µF capacitor; accepts 2.5V–5.5V input; reverse-current protected. |
| GND | Ground / Thermal Pad | Primary electrical ground and main thermal path; must be soldered to large PCB copper area for thermal dissipation. |
| SHDN | Active-Low Shutdown Control | Pulled high to IN for normal operation; reduces supply current to 0.1µA (typ) when asserted low. |
| RESET | Active-Low Reset Output | Push-pull configuration; asserts low during power-up, brownout, or SHDN activation; holds for ≥150ms post-recovery. |
| FB | Feedback / Remote Sense Input | Connected directly to load VCC for precise remote voltage sensing; enables external NPN transistor for higher-current applications. |
| OUT | Regulated Output | Delivers 1.8V @ up to 300mA; bypassed with ≥3.3µF low-ESR capacitor; supports supercapacitor backup hold-up. |
Key Features
| Feature | Design Value |
|---|---|
| UCSP Packaging | 3×3mm footprint with thermal pad - reduces board area by >60% vs. SOT23-6 while maintaining thermal performance. |
| Remote Feedback (FB) | Enables direct connection to load point - eliminates IR drop errors in long PCB traces or flex cables. |
| Low-Noise Regulation | 75µVRMS output noise - preserves signal integrity in mixed-signal SoCs and RF front-ends. |
| Integrated Reset Supervision | Single-chip replacement for discrete reset IC + LDO - eliminates BOM count and layout complexity. |
| Reverse Current Protection | 0.01µA max OUT→IN leakage - prevents battery backfeed during hot-swap or backup-supply transitions. |
| Thermal & Short-Circuit Protection | Auto-recovering shutdown at +180°C with 20°C hysteresis - ensures robustness under sustained overload. |
Applications
| Handheld Medical Sensors | Bluetooth LE Wearables |
|---|---|
Use Scenario: Continuous ECG/PPG monitoring in coin-cell–powered patch sensors with real-time wireless telemetry. IC Role / Device Role / Timing Role: Primary 1.8V supply for ultra-low-power MCU and BLE radio; provides synchronized power-on reset and brownout detection. Use Value: 82µA quiescent current extends battery life beyond 6 months; 150ms reset timeout ensures reliable BLE stack initialization before RF transmission. |
Use Scenario: Compact earbud firmware update module requiring stable 1.8V core voltage and deterministic boot sequence. IC Role / Device Role / Timing Role: LDO regulator and reset supervisor for Nordic nRF52832; FB pin senses voltage at SoC VDD pin to compensate trace IR drop. Use Value: 75µVRMS noise prevents digital switching artifacts from coupling into analog microphone inputs; UCSP footprint fits within 8mm × 8mm earbud PCB. |
| Industrial IoT Edge Nodes | USB-Powered Test Instruments |
Use Scenario: Battery-backed environmental sensor node operating in −40°C to +85°C ambient with periodic LoRaWAN transmission. IC Role / Device Role / Timing Role: Main power rail regulator with supercapacitor hold-up support; RESET signals MCU on input dropout or thermal fault. Use Value: ±2.0% output accuracy over full temperature range maintains ADC reference stability; reverse-current protection isolates backup cap during main battery removal. |
Use Scenario: Portable oscilloscope probe interface powered solely from USB 5V bus with no external adapter. IC Role / Device Role / Timing Role: Generates clean 1.8V for FPGA configuration and ADC reference; SHDN enables host-controlled power gating. Use Value: 114mV dropout at 300mA allows operation down to 1.914V input - accommodates USB port voltage sag under load; UCSP thermal pad sustains continuous operation at 70°C ambient. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO-with-reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6477BL18AD2 | Same 1.8V output and UCSP package, but 20ms reset timeout (vs. 150ms) | Suitable for fast-boot MCUs where shorter reset hold time is acceptable | Select when system clock stabilization completes in <25ms; not suitable for crystal oscillators requiring longer startup. |
| TPS7A0518PDBVR | 1.8V LDO only (no integrated reset); 25µA IQ; SOT-23-5 package; no FB pin | Requires external reset IC (e.g., TPS3808G18) for supervision functionality | Choose if lowest quiescent current is critical and board space allows separate reset IC; lacks remote sense and reset timing integration. |
Compared with MAX6477BL18AD2 and TPS7A0518PDBVR, the MAX6477BL18AD3 uniquely combines factory-trimmed 1.8V regulation, 150ms reset timeout, remote FB sensing, and UCSP thermal efficiency - enabling single-chip power management in size- and reliability-critical portable designs without compromising on reset timing or noise performance.
Availability
MAX6477BL18AD3 is available at Aetrix Electronics and suitable for handheld medical sensors, Bluetooth LE wearables, industrial IoT edge nodes, and USB-powered test instruments requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6477BL18AD3 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 solutions for industrial, automotive, communications, and consumer applications.
The MAX6469–MAX6484 product line was designed specifically for battery-powered portable electronics needing integrated LDO regulation and microprocessor reset supervision in minimal footprint - targeting PDA, cellular phone, and digital camera power rails.
FAQ
What output voltage does the MAX6477BL18AD3 provide?
The MAX6477BL18AD3 provides a factory-trimmed fixed output voltage of 1.8V with ±2.0% accuracy over the full −40°C to +85°C operating temperature range. This voltage is set internally and requires no external resistors; connecting the FB pin to the load VCC enables precise remote sensing to compensate for PCB trace losses.
How does the reset function work on the MAX6477BL18AD3?
The MAX6477BL18AD3 asserts its active-low RESET output when the regulated output drops below 87.5% of nominal (1.575V for 1.8V output), and holds RESET low for a minimum of 150ms after VOUT recovers above threshold. RESET also activates during power-up, input undervoltage lockout (<2.25V), and when SHDN is pulled low - ensuring deterministic system initialization.
Can the MAX6477BL18AD3 be used with a backup supercapacitor?
Yes, the MAX6477BL18AD3 supports supercapacitor backup via its reverse-current protection and FB pin architecture. When the main IN supply is removed, OUT can be held up by an external supercapacitor; the device draws only 40µA (typ) from OUT to GND, and asserts RESET to place the system in low-power mode until the main supply returns and VOUT exceeds 1.575V.
What is the purpose of the FB pin on the MAX6477BL18AD3?
The FB (feedback) pin on the MAX6477BL18AD3 is used for remote voltage sensing - it connects directly to the load's VCC point rather than the regulator's OUT pin. This compensates for IR drop across PCB traces or connectors, ensuring the load receives precisely 1.8V. It also enables high-current expansion using an external NPN transistor, as documented in Figure 2 of the datasheet.
Is the MAX6477BL18AD3 RoHS-compliant and lead-free?
Yes, the MAX6477BL18AD3 is manufactured in a lead(Pb)-free and RoHS-compliant UCSP package. Per Maxim's ordering guide, lead-free versions are denoted by a "+T" suffix instead of "-T"; the standard MAX6477BL18AD3-T is lead-free and compliant with EU RoHS Directive 2011/65/EU and China RoHS.
MAX6477BL18AD3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 6-UFBGA, CSPBGA
- 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 (1.8V)
- Voltage - Output (Max):
- 5.5V
- Voltage Dropout (Max):
- -
- Current - Output:
- 300mA
- Current - Quiescent (Iq):
- 136 µA
- Current - Supply (Max):
- -
- PSRR:
- -
- Control Features:
- Enable, Reset
- 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:
- 6-UCSP (1.52x1.52)
MAX6477BL18AD3 FAQ
1.How can I place an order for MAX6477BL18AD3 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6477BL18AD3 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 MAX6477BL18AD3 reliable?
The price and inventory of MAX6477BL18AD3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6477BL18AD3 is usually 5 days.
3.What payment methods are accepted for MAX6477BL18AD3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6477BL18AD3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6477BL18AD3?
MAX6477BL18AD3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6477BL18AD3 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 MAX6477BL18AD3?
For technical support, including MAX6477BL18AD3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6477BL18AD3 requirements.
6.How does Aetrix verify that MAX6477BL18AD3 is sourced from the original manufacturer or authorized distributors?
All MAX6477BL18AD3 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 MAX6477BL18AD3 meets industry standards.
7.What is the process for return or replacement of MAX6477BL18AD3?
All MAX6477BL18AD3 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6477BL18AD3, 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 MAX6477BL18AD3 part is unused and in its original packaging.
Return procedure for MAX6477BL18AD3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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