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Analog Devices Inc./Maxim Integrated MAX6481BL25BD3+T
- Part No.:
- MAX6481BL25BD3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 6-UFBGA, CSPBGA
- Datasheet:
-
MAX6481BL25BD3+T.pdf
- Description:
- IC REG LIN POS ADJ 300MA 6UCSP
- Quantity:
- Payment:
- Shipping:
Inventory:3,865
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Product details
Overview
The MAX6481BL25BD3+T from Maxim Integrated is a 300mA low-dropout linear regulator with integrated microprocessor reset circuit, fixed 2.5V output voltage, -12.5% reset threshold accuracy, and 150ms (min) reset timeout period. It delivers ±2.0% output voltage accuracy over -40°C to +85°C, features 82µA quiescent current, and supports shutdown mode with 0.1µA supply current. Designed for battery-powered portable equipment including Bluetooth modules and digital cameras.
For engineers reviewing the MAX6481BL25BD3+T datasheet, MAX6481BL25BD3+T pinout, MAX6481BL25BD3+T application, or MAX6481BL25BD3+T equivalent, this device offers verified LDO performance with integrated reset supervision, precise voltage regulation, low-noise operation, and thermal/short-circuit protection - critical for space-constrained, low-power embedded systems requiring reliable power sequencing and brownout detection.
Technical Context
The MAX6481BL25BD3+T belongs to the MAX6469–MAX6484 family of fully integrated LDOs combining regulation and reset supervision in a single die. Its regulator core operates from 2.5V to 5.5V input, delivering 2.5V at up to 300mA with dropout as low as 114mV at full load. The reset circuit uses the same internal reference as the regulator and asserts active-low RESET when VOUT falls below 87.5% of nominal (i.e., 2.1875V), holding assertion for ≥150ms after recovery.
This variant includes SHDN (active-low shutdown) but no MR (manual reset) or FB (remote sense) pins - confirmed by its pin configuration matching MAX6473/MAX6474/MAX6481/MAX6482. It uses a 6-pin SOT23-6 package with IN, GND, SHDN, RESET, SET, and OUT terminals, where SET is tied to GND for fixed 2.5V operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.5V ±2.0% over -40°C to +85°C - ensures stable core logic supply for microcontrollers and sensors. |
| Max Output Current | 300mA guaranteed - sufficient to power mid-tier MCUs, RF transceivers, or camera ISPs without external pass devices. |
| Dropout Voltage | 114mV at 300mA - enables operation from single-cell Li-ion (3.0V min) or triple-alkaline (4.5V) sources with margin. |
| Quiescent Current | 82µA typical - extends battery life in always-on monitoring applications such as wireless sensor nodes. |
| Reset Threshold | -12.5% of VOUT (2.1875V) with ±2.5% tolerance - meets JEDEC JESD8-12A requirements for 2.5V logic supplies. |
| Reset Timeout | 150ms minimum - satisfies boot-time stabilization requirements for ARM Cortex-M and similar processors. |
| Shutdown Current | 0.1µA typical - enables ultra-low-power sleep states in portable instrumentation and wearables. |
Pinout & Package
Package: 6-pin SOT23-6 (JEDEC MO-178AA), 2.9mm × 1.6mm × 1.1mm body, exposed pad not present (non-TDFN/UCSP variant).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN) | Regulator input | Accepts 2.5V–5.5V unregulated input; requires 0.1µF ceramic bypass to GND for stability. |
| 2 (GND) | Power and thermal ground | Primary return path and heatsink; must connect to large PCB copper area for thermal dissipation. |
| 3 (SHDN) | Active-low shutdown control | Pull low to disable regulator and reduce supply current to 0.1µA; tie to IN for normal operation. |
| 4 (RESET) | Active-low push-pull reset output | Asserts low during power-up, brownout, or shutdown; holds for ≥150ms after VOUT recovers. |
| 5 (SET) | Feedback select input | Tied to GND internally or externally to enable fixed 2.5V output; open or floating disables regulation. |
| 6 (OUT) | Regulated output | Delivers 2.5V at up to 300mA; requires ≥3.3µF low-ESR ceramic capacitor to GND for transient response. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated reset supervisor | Eliminates need for external supervisor IC while ensuring processor reset occurs before clock stabilization. |
| Low dropout voltage | 55mV at 150mA enables use with marginal input sources like aging batteries or low-headroom DC-DC outputs. |
| Thermal and short-circuit protection | Shuts down at 180°C junction temperature with 20°C hysteresis - prevents damage during sustained overload. |
| Reverse current blocking | 0.01µA typical OUT-to-IN leakage prevents backup capacitor discharge into depleted battery sources. |
| Input undervoltage lockout | 2.25V UVLO threshold prevents erratic startup when input rises slowly or from weak sources. |
Applications
| Bluetooth Module Power | Digital Camera Core Supply |
|---|---|
Use Scenario: Powers baseband processor and RF transceiver in compact Bluetooth audio accessories with single-cell Li-ion battery. IC Role / Device Role / Timing Role: Provides clean, regulated 2.5V supply and asserts RESET until VOUT stabilizes post-battery insertion or wake-up. Use Value: Enables deterministic boot sequence and eliminates external reset IC, reducing BOM count and PCB area by 30%. |
Use Scenario: Supplies image signal processor (ISP) and memory interface in ultra-thin digital cameras operating from dual alkaline cells. IC Role / Device Role / Timing Role: Delivers low-noise 2.5V rail with <75µVRMS noise and guarantees 150ms reset hold time for ISP firmware initialization. Use Value: Prevents corrupted frame capture during power ramp-up and sustains operation down to 2.7V input via 114mV dropout. |
| Notebook Subsystem Rail | PCMCIA Card Regulation |
Use Scenario: Generates auxiliary 2.5V rail for embedded controller (EC) and touchpad interface in fanless notebook designs. IC Role / Device Role / Timing Role: Regulates from 3.3V system rail with minimal heat generation; SHDN controlled by EC for dynamic power gating. Use Value: Reduces idle power by 99.9% in suspend mode (0.1µA shutdown current) and maintains thermal safety under continuous 200mA load. |
Use Scenario: Powers USB-to-PCMCIA bridge controllers in legacy expansion cards requiring tight voltage tolerance. IC Role / Device Role / Timing Role: Supplies 2.5V ±2.0% with line/load regulation better than 0.2%, and monitors VOUT for hot-plug detection. Use Value: Ensures compliance with PCMCIA 2.01 specification for supply stability during card insertion/removal events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO-with-reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS76325DBVR | 250mA max output, 120mV dropout at 250mA, no integrated reset, requires external supervisor. | Lacks built-in reset functionality - adds component count and timing uncertainty in boot sequencing. | Select when cost sensitivity outweighs integration benefit and board space allows discrete reset IC. |
| ADM6315-25ARTZ-RL7 | Standalone reset IC only (no regulation), 2.5V threshold, 200ms timeout, 1.6µA supply current. | Cannot replace MAX6481BL25BD3+T alone - must pair with separate LDO (e.g., ADM7172). | Choose when existing LDO design needs added reset supervision without changing regulator footprint. |
Compared with TPS76325DBVR and ADM6315-25ARTZ-RL7, the MAX6481BL25BD3+T uniquely integrates regulation and reset in one 6-pin SOT23 package, eliminating layout complexity, reducing total solution size by >40%, and guaranteeing synchronized timing between power delivery and reset assertion - critical for fail-safe embedded boot.
Availability
MAX6481BL25BD3+T is available at Aetrix Electronics and suitable for Bluetooth modules, digital cameras, notebook subsystems, and PCMCIA cards requiring stable component supply with guaranteed long-term availability and RoHS-compliant packaging.
Supply support for MAX6481BL25BD3+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 and mixed-signal ICs for power management, sensing, and communication applications.
The MAX6469–MAX6484 product line was designed specifically for battery-powered portable electronics needing combined LDO regulation and microprocessor reset supervision in minimal footprint - targeting handheld instruments, wireless modules, and compact computing devices.
FAQ
What is the exact output voltage tolerance of the MAX6481BL25BD3+T over temperature?
The MAX6481BL25BD3+T guarantees ±2.0% output voltage accuracy across the full -40°C to +85°C operating range. This is specified in the Electrical Characteristics table for fixed-output devices MAX6477–MAX6484 under conditions of 2mA ≤ IOUT ≤ 300mA. At +25°C, the tighter ±1.1% tolerance applies. The 2.5V nominal output therefore remains within 2.45V–2.55V over temperature.
Does the MAX6481BL25BD3+T include manual reset (MR) capability?
No, the MAX6481BL25BD3+T does not include a manual reset (MR) input. Its pinout matches the MAX6481/MAX6482 variant group, which features SHDN and RESET but no MR terminal. Manual reset is only present on MAX6471–MAX6474 and MAX6479–MAX6482 variants. The MAX6481BL25BD3+T relies solely on power-on reset, brownout detection, and shutdown-triggered reset.
What is the minimum input voltage required for the MAX6481BL25BD3+T to regulate 2.5V output at 300mA?
The minimum input voltage is determined by dropout: at 300mA load, the MAX6481BL25BD3+T requires VIN ≥ VOUT + ∆VDO = 2.5V + 114mV = 2.614V. However, the Absolute Maximum Ratings specify a minimum VIN of 2.5V, and the Electrical Characteristics confirm operation down to 2.5V input with reduced output current capability. For guaranteed 300mA regulation, VIN must be ≥2.614V.
Can the MAX6481BL25BD3+T be used with an external NPN transistor for higher current?
No, the MAX6481BL25BD3+T does not support remote feedback or external pass transistors. It lacks an FB (feedback) pin - that functionality is exclusive to MAX6475/MAX6476/MAX6483/MAX6484 variants. The MAX6481BL25BD3+T uses internal feedback and is rated for 300mA maximum output without external augmentation.
What package type is used for the MAX6481BL25BD3+T and is it RoHS-compliant?
The MAX6481BL25BD3+T uses a 6-pin SOT23-6 package (JEDEC MO-178AA). Per Maxim's Ordering Information, the "+T" suffix denotes lead(Pb)-free/RoHS-compliant construction. The device meets RoHS Directive 2011/65/EU and is compatible with standard reflow soldering profiles per JEDEC J-STD-020.
MAX6481BL25BD3+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 6-UFBGA, CSPBGA
- Packaging:
- Tape & Reel (TR)
- 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 (2.5V)
- Voltage - Output (Max):
- 5.5V
- Voltage Dropout (Max):
- 0.25V @ 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:
- 6-UCSP (1.52x1.52)
MAX6481BL25BD3+T FAQ
1.How can I place an order for MAX6481BL25BD3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6481BL25BD3+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 MAX6481BL25BD3+T reliable?
The price and inventory of MAX6481BL25BD3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6481BL25BD3+T is usually 5 days.
3.What payment methods are accepted for MAX6481BL25BD3+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6481BL25BD3+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6481BL25BD3+T?
MAX6481BL25BD3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6481BL25BD3+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 MAX6481BL25BD3+T?
For technical support, including MAX6481BL25BD3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6481BL25BD3+T requirements.
6.How does Aetrix verify that MAX6481BL25BD3+T is sourced from the original manufacturer or authorized distributors?
All MAX6481BL25BD3+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 MAX6481BL25BD3+T meets industry standards.
7.What is the process for return or replacement of MAX6481BL25BD3+T?
All MAX6481BL25BD3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6481BL25BD3+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 MAX6481BL25BD3+T part is unused and in its original packaging.
Return procedure for MAX6481BL25BD3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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