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Analog Devices Inc./Maxim Integrated MAX6478BL28BD3
- Part No.:
- MAX6478BL28BD3
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 6-UFBGA, CSPBGA
- Datasheet:
-
MAX6478BL28BD3.pdf
- Description:
- IC REG LINEAR 6UCSP
- Quantity:
- Payment:
- Shipping:
Inventory:453
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Product details
Overview
MAX6478BL28BD3 from Maxim Integrated is a 300mA low-dropout linear regulator with integrated microprocessor reset circuit, delivering a fixed +2.8V output, -12.5% reset threshold accuracy, and 150ms minimum reset timeout. It features 82µA quiescent current, 137mV dropout at 300mA load, and operates across -40°C to +85°C - optimized for battery-powered portable systems requiring reliable power sequencing and brownout protection.
For engineers reviewing the MAX6478BL28BD3 datasheet, MAX6478BL28BD3 pinout, MAX6478BL28BD3 application, or MAX6478BL28BD3 equivalent, key selection criteria include its UCSP-6 (3×3mm) package, active-low open-drain RESET output, shutdown capability (0.1µA), ±2.5% output voltage accuracy over temperature, and compatibility with remote sense configurations in higher-current designs.
Technical Context
The MAX6478BL28BD3 implements a dual-mode LDO core with internal feedback for fixed +2.8V output and a dedicated supervisor circuit sharing the same reference. Its reset logic monitors VOUT against a -12.5% threshold and holds RESET low for ≥150ms after recovery, eliminating external supervisors in microprocessor power-up validation.
This device belongs to the MAX6477–MAX6484 UCSP-series subset featuring 75µVRMS output noise (at VOUT = 3.0V), thermal shutdown at +180°C with 20°C hysteresis, and reverse current protection limiting OUT-to-IN leakage to 0.01µA - critical for battery backup integrity and system-level fault containment.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | +2.8V fixed, ±2.5% accuracy over -40°C to +85°C - ensures stable core logic supply under thermal stress. |
| Dropout Voltage | 137mV at 300mA load - enables operation down to VIN = 2.937V, extending battery runtime in single-cell Li-ion or 3×alkaline systems. |
| Quiescent Current | 82µA typical - minimizes standby drain in always-on portable instrumentation and wireless modules. |
| Reset Threshold | -12.5% of nominal VOUT (i.e., 2.45V) - provides tighter supply monitoring than -7.5% variants for high-reliability MCU boot sequences. |
| Reset Timeout | 150ms minimum - guarantees sufficient hold-off time for clock oscillator stabilization and memory initialization before processor release. |
| Shutdown Current | 0.1µA typical - supports ultra-low-power sleep modes without external disconnect switches. |
| Package | 3×3mm UCSP-6 (chip-scale) - enables compact PCB layouts in space-constrained handheld devices and USB peripherals. |
Pinout & Package
The MAX6478BL28BD3 is housed in a 3×3mm, 6-bump UCSP™ package with exposed paddle (internally connected to GND). Thermal performance is optimized by soldering the EP pad directly to the PCB ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN (Bump A1) | Regulator input | Accepts 2.5V–5.5V input; requires 0.1µF bypass capacitor to GND for stability and transient response. |
| GND (Bump A2) | Power and thermal ground | Serves as primary return path and heatsink; must be connected to large copper area for thermal dissipation. |
| SHDN (Bump A3) | Active-low shutdown control | Pulling low disables regulator and reduces supply current to 0.1µA; connect to VIN for normal operation. |
| RESET (Bump C3) | Active-low open-drain reset output | Asserts low during power-up, brownout, or shutdown; requires external pullup for µP reset signaling. |
| SET (Bump C2) | Feedback configuration pin | Connected to GND to select fixed +2.8V output; floating or externally biased for adjustable mode (not used in this variant). |
| OUT (Bump C1) | 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 reset supervisor | Eliminates need for discrete supervisor IC while ensuring synchronized power-good assertion with regulated output stability. |
| UCSP-6 low-noise packaging | 75µVRMS output noise (typ) at 3.0V - meets stringent analog/RF supply requirements without added filtering components. |
| Reverse current protection | 0.01µA max OUT-to-IN leakage - prevents battery backfeed and preserves backup power integrity during main supply removal. |
| Thermal shutdown with hysteresis | Triggers at +180°C and re-enables only after 20°C cooldown - enables safe fault recovery without latch-up in thermally constrained enclosures. |
| Guaranteed 300mA output | Validated across full temperature range and input voltage span - supports consistent performance in varying environmental conditions. |
Applications
| Handheld Medical Instruments | USB-C Powered Peripherals |
|---|---|
Use Scenario: Portable blood glucose meters and pulse oximeters operating from single-cell lithium batteries with strict low-power and signal integrity requirements. IC Role / Device Role / Timing Role: Primary 2.8V power rail generator and system reset coordinator during cold start and battery swap events. Use Value: 82µA quiescent current extends battery life beyond 6 months in standby; 150ms reset timeout ensures ADC reference and sensor bias circuits stabilize before measurement initiation. | Use Scenario: Compact USB audio adapters and HID devices drawing power exclusively from USB-C VBUS (5V) with no external adapter. IC Role / Device Role / Timing Role: Step-down LDO and power-valid supervisor for 2.8V digital logic and interface ICs. Use Value: 137mV dropout enables >95% efficiency at 300mA load; open-drain RESET interfaces directly with USB controller's reset input for plug-and-play enumeration reliability. |
| Bluetooth LE Sensor Nodes | Industrial Handheld Scanners |
Use Scenario: Battery-operated BLE temperature/humidity sensors deployed in warehouses with intermittent connectivity and long sleep cycles. IC Role / Device Role / Timing Role: Always-on 2.8V supply for RF transceiver and MCU, with precise reset timing aligned to crystal startup. Use Value: ±2.5% output accuracy maintains RF PA bias stability across temperature; 0.1µA shutdown current enables multi-year operation on CR2032 coin cells. | Use Scenario: Ruggedized barcode scanners using 3×AA alkaline batteries and requiring robust brownout immunity during motor actuation. IC Role / Device Role / Timing Role: Main system regulator and watchdog-enabling reset source during voltage sag induced by motor commutation. Use Value: -12.5% reset threshold prevents spurious resets during brief 100ms dips; thermal shutdown protects against sustained overload during continuous scanning. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO-with-reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6478BL28BD4 | Same package, output, and reset threshold, but 1200ms reset timeout instead of 150ms. | Suitable for systems requiring longer reset hold-off, e.g., FPGA configuration or multi-stage bootloaders. | Select MAX6478BL28BD4 only if extended reset duration is explicitly required; otherwise MAX6478BL28BD3 provides optimal timing for standard µP boot. |
| TPS799285DRVR | 200mA LDO with 3.8µA IQ and no integrated reset; requires external supervisor (e.g., TPS3808G18) for reset functionality. | Applicable where lower quiescent current outweighs integration benefits, and board space allows discrete supervision. | Choose TPS799285DRVR only when ultra-low IQ dominates design priority and reset timing can be independently managed. |
Compared with MAX6478BL28BD4 and TPS799285DRVR, the MAX6478BL28BD3 uniquely balances integrated reset timing (150ms), low-noise UCSP packaging, and 300mA drive in a single 3×3mm footprint - making it optimal for space- and reliability-critical portable electronics where discrete supervision adds cost and layout risk.
Availability
MAX6478BL28BD3 is available at Aetrix Electronics and suitable for handheld medical instruments, USB-C powered peripherals, Bluetooth LE sensor nodes, and industrial handheld scanners requiring stable component supply, long-term lifecycle support, and guaranteed parametric compliance.
Supply support for MAX6478BL28BD3 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 and mixed-signal ICs for power management, sensing, and communication in demanding environments.
The MAX6469–MAX6484 product line was engineered specifically for battery-powered portable equipment needing tightly integrated power regulation and microprocessor supervision in minimal footprint - addressing challenges in PDA, cellular, and wireless module power architecture.
FAQ
What is the exact output voltage tolerance of the MAX6478BL28BD3 over temperature?
The MAX6478BL28BD3 guarantees ±2.5% output voltage accuracy across the full -40°C to +85°C operating range. This specification applies specifically to the MAX6477–MAX6484 UCSP-series variants and reflects measured deviation from the nominal +2.8V output under all load and thermal conditions within datasheet limits.
Does the MAX6478BL28BD3 support remote voltage sensing?
No, the MAX6478BL28BD3 does not support remote sensing. It uses the SET pin for fixed-output configuration (tied to GND) and lacks an FB pin. Remote sense capability is exclusive to MAX6475/MAX6476/MAX6483/MAX6484 variants, which feature a dedicated FB terminal for external feedback placement.
What is the maximum input voltage the MAX6478BL28BD3 can tolerate?
The MAX6478BL28BD3 has an absolute maximum input voltage rating of +7V, but its functional operating range is specified from +2.5V to +5.5V. Operation above +5.5V violates the recommended conditions and may compromise long-term reliability or parametric performance, even if within absolute ratings.
How does the RESET output behave during shutdown of the MAX6478BL28BD3?
When SHDN is pulled low, the MAX6478BL28BD3 asserts RESET active-low and maintains it throughout shutdown. The RESET signal remains asserted until both SHDN is deasserted *and* VOUT rises above the -12.5% reset threshold (2.45V) for ≥150ms - ensuring clean power sequencing during wake-up transitions.
Is the UCSP-6 package of the MAX6478BL28BD3 compatible with standard reflow profiles?
Yes, but only JEDEC J-STD-020A-compliant IR/convection reflow profiles are permitted for the MAX6478BL28BD3 UCSP-6 package. Pre-heating is mandatory, and hand soldering or wave soldering is strictly prohibited due to thermal sensitivity of the chip-scale construction.
MAX6478BL28BD3 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 (2.8V)
- Voltage - Output (Max):
- 5.5V
- Voltage Dropout (Max):
- 0.21V @ 300mA
- 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)
MAX6478BL28BD3 FAQ
1.How can I place an order for MAX6478BL28BD3 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6478BL28BD3 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 MAX6478BL28BD3 reliable?
The price and inventory of MAX6478BL28BD3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6478BL28BD3 is usually 5 days.
3.What payment methods are accepted for MAX6478BL28BD3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6478BL28BD3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6478BL28BD3?
MAX6478BL28BD3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6478BL28BD3 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 MAX6478BL28BD3?
For technical support, including MAX6478BL28BD3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6478BL28BD3 requirements.
6.How does Aetrix verify that MAX6478BL28BD3 is sourced from the original manufacturer or authorized distributors?
All MAX6478BL28BD3 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 MAX6478BL28BD3 meets industry standards.
7.What is the process for return or replacement of MAX6478BL28BD3?
All MAX6478BL28BD3 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6478BL28BD3, 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 MAX6478BL28BD3 part is unused and in its original packaging.
Return procedure for MAX6478BL28BD3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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