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Analog Devices Inc./Maxim Integrated MAX77505AEFB+T
- Part No.:
- MAX77505AEFB+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 10-UFQFN
- Datasheet:
-
MAX77505AEFB+T.pdf
- Description:
- IC REG BUCK ADJ 4.6A 10FC2QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,167
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Product details
Overview
MAX77505AEFB+T from Analog Devices is a 16V-input, 4.6A switching current, ultra-low quiescent current (800nA typ) hysteretic buck converter in a 10-pin FC2QFN (2.0mm × 2.0mm × 0.55mm) package. It delivers configurable output voltages from 0.8V to 5.5V via external RSEL resistor, supports 2.5V–16V input range, and integrates cycle-by-cycle current limiting, thermal shutdown, and open-drain POKB for use in battery-powered asset trackers and smart door locks.
For engineers reviewing the MAX77505AEFB+T datasheet, MAX77505AEFB+T pinout, MAX77505AEFB+T application, or MAX77505AEFB+T equivalent, key selection criteria include its 70nA shutdown current, 2MHz typical switching frequency in CCM, 95% peak efficiency at 7.6VIN/3.3VOUT, and nanoPower Technology-enabled operation across wide load ranges - critical for long-idle IoT endpoints.
Technical Context
The MAX77505AEFB+T employs a current-mode hysteretic control architecture with pseudo-fixed inductor ripple current, enabling ~2MHz switching in continuous conduction mode (CCM) at 7.6VIN/3.3VOUT. Its internal high-side MOSFET has 50mΩ RDS(ON), low-side MOSFET has 45mΩ RDS(ON), and peak current limit is factory-trimmed to 4.6A (typ).
It features adaptive low-power mode entry based on output voltage over-regulation hysteresis (VOUT_HYS), waking every 20ms to monitor VOUT; exits immediately if VOUT drops 10mV below hysteresis threshold. The integrated active discharge circuit (120Ω typ) connects OUTS to AGND during disable/UVLO events.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 16V - supports single Li+ up to 4-cell alkaline or 3S Li-ion stacks without external pre-regulation. |
| Output Voltage Range | 0.8V to 5.5V - set by 1% RSEL resistor between SEL and AGND; 30 preset values per datasheet Table 1. |
| Quiescent Current | 800nA (typ) - enables multi-year battery life in always-on sensor nodes with microamp-level average loads. |
| Switching Current Limit | 4.6A (typ) - peak current limit for high-side MOSFET; protects against overload and short-circuit faults. |
| Efficiency | 95% peak at 7.6VIN/3.3VOUT - maintains high conversion efficiency even at light loads due to hysteretic control. |
| Shutdown Current | 70nA (typ) - ensures negligible battery drain during deep sleep or system power-off states. |
| Switching Frequency | 2.0MHz (typ, CCM) - enables use of compact 1.5µH inductors and small ceramic capacitors for space-constrained designs. |
| Thermal Shutdown | 150°C (typ) with 20°C hysteresis - latches off output until junction cools to ~130°C; requires EN toggle or power cycle to resume. |
Pinout & Package
MAX77505AEFB+T is housed in a 10-lead FC2QFN package (2.0mm × 2.0mm × 0.55mm, 0.5mm pitch), optimized for thermal performance (θJA = 83.01°C/W on 4-layer FR-4 board) and high-density PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PGND | Power Ground | Main return path for high-current LX switching loop; must be connected to low-impedance ground plane under IC. |
| LX | Buck Switch Node | Connection point for external inductor; experiences fast 0V–VIN transitions; requires short, wide trace to minimize EMI. |
| IN | Input Power Supply | Primary DC input (2.5V–16V); bypassed to PGND with ≥10µF X7R ceramic capacitor placed adjacent to pin. |
| BST | Bootstrap Supply | Supplies gate drive for high-side MOSFET; requires 0.22µF X7R capacitor between BST and LX. |
| EN | Enable Control Input | Active-high logic input (VIH ≥ 1.2V); initiates soft-start and disables output with active discharge when pulled low. |
| SEL | Output Voltage Selection | Analog input referenced to AGND; resistance value sets target VOUT per Table 1 (e.g., 200Ω → 0.8V). |
| POKB | Inverted Power-OK Output | Open-drain digital output (requires 10kΩ pull-up); asserts low when VOUT is within ±2% of target; falls at 90–93% VOUT. |
| AGND | Analog Ground | Reference for SEL, OUTS, VL, and POKB; must be tied to PGND at single point near IC to avoid noise coupling. |
| VL | LDO Bypass Output | Internal LDO output for analog bias; bypassed to AGND with 2.2µF X7R capacitor to stabilize internal reference. |
| OUTS | Output Voltage Sense Input | High-impedance feedback node; connects directly to VOUT net; used for regulation and active discharge control. |
Key Features
| Feature | Design Value |
|---|---|
| nanoPower Technology™ | Enables 800nA quiescent current and 70nA shutdown current - extends battery life in infrequently active IoT devices. |
| Hysteretic Current-Mode Control | Delivers ~2MHz fixed-frequency-like operation in CCM while maintaining high light-load efficiency without external compensation. |
| Configurable Output Voltage | 30 preset VOUT options (0.8V–5.5V) selected via single 1% RSEL resistor - eliminates need for external feedback divider network. |
| Integrated Active Discharge | 120Ω (typ) discharge path from OUTS to AGND engages automatically during disable/UVLO - prevents unsafe VOUT hold-up. |
| Comprehensive Protection Suite | Includes cycle-by-cycle ILIM (4.6A), UVLO (2.45V rise / 2.375V fall), thermal shutdown (150°C), and hiccup-mode fault recovery. |
| FC2QFN Thermal Performance | Low-profile 2mm × 2mm package with exposed thermal pad (connected to PGND) achieves θJC = 38.24°C/W for reliable 3A continuous operation. |
Applications
| Asset Tracking Devices | Smart Door Locks |
|---|---|
|
Use Scenario: GPS/GNSS + cellular modem intermittently active for location reporting every few hours; MCU and sensors remain in deep sleep most of time. IC Role / Device Role: Primary step-down regulator supplying 3.3V to MCU, radio, and sensors from 3.7V Li-ion or 6V alkaline stack. Use Value: 800nA IQ and 70nA shutdown current enable >5-year battery life; POKB provides reliable power-good signaling to MCU before wake-up. |
Use Scenario: Battery-powered electronic lock with motor driver, BLE SoC, and tamper detection; operates on four AA alkalines. IC Role / Device Role: Main power rail generator delivering stable 3.0V or 3.3V to BLE controller and motor driver IC from 4×1.5V (6V) input. Use Value: 2.5V–16V input range accommodates full alkaline discharge curve (6V → 4.2V); 4.6A ILIM supports brief motor surge currents. |
| Wearable Health Monitors | Smart Meters (Battery Backup) |
|
Use Scenario: Optical heart-rate sensor and ARM Cortex-M0+ MCU worn continuously; data transmitted hourly via BLE. IC Role / Device Role: Efficient 1.8V supply for sensor analog front-end and 3.3V rail for MCU/radio, derived from coin cell or thin-film battery. Use Value: Low IQ preserves capacity during 99% idle time; 0.8V–5.5V output flexibility supports dual-rail architectures without extra regulators. |
Use Scenario: AMI smart meter with primary AC-DC supply and lithium-thionyl-chloride backup battery for outage memory retention. IC Role / Device Role: Backup power manager converting 3.6V battery to regulated 3.3V for RTC, SRAM, and communication interface during grid failure. Use Value: Ultra-low shutdown current prevents backup battery depletion over 10+ year deployments; thermal shutdown guards against enclosure overheating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62840DRVR | 2.7V–6.5V input, 1.8A max output, 100nA IQ, 2.5MHz fixed-frequency PWM control. | Lower input voltage ceiling; unsuitable for 4-cell alkaline or 3S Li-ion; better for single Li+ | Select TPS62840DRVR only when input stays ≤6.5V and peak load <1.8A; lacks RSEL-based VOUT programming. |
| MP2152GQZ-P | 2.5V–5.5V input, 2A output, 25µA IQ, 2MHz constant-on-time control, 10-pin QFN (3mm × 3mm). | Narrower VIN range; higher IQ limits battery life in ultra-low-power apps; larger footprint than FC2QFN. | Choose MP2152GQZ-P if cost sensitivity outweighs size/IQ requirements and input never exceeds 5.5V. |
Compared with TPS62840DRVR and MP2152GQZ-P, the MAX77505AEFB+T uniquely combines 16V input support, 4.6A current capability, sub-µA quiescent current, and resistor-programmable output in a 2mm × 2mm package - making it the only viable option for compact, long-life, wide-input industrial IoT nodes.
Availability
MAX77505AEFB+T is available at Aetrix Electronics and suitable for asset tracking, smart door locks, and wearable health monitors requiring stable component supply, long-term lifecycle assurance, and consistent parametric performance across production batches.
Supply support for MAX77505AEFB+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
Analog Devices, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The MAX77505AEFB+T belongs to Analog Devices' nanoPower™ DC-DC converter family, engineered specifically for ultra-low-power, battery-operated edge devices where multi-year runtime and minimal standby loss are mandatory design requirements.
FAQ
What is the maximum input voltage rating for the MAX77505AEFB+T?
The MAX77505AEFB+T has an absolute maximum input voltage rating of +17.6V relative to PGND, with recommended operating range of 2.5V to 16V. Exceeding 16V during normal operation risks violating the device's safe operating area; sustained operation above 17.6V may cause permanent damage per Absolute Maximum Ratings table.
How does the MAX77505AEFB+T achieve its 800nA quiescent current?
The MAX77505AEFB+T achieves 800nA typical quiescent current using Analog Devices' nanoPower Technology™, which integrates ultra-low-leakage bias circuits, adaptive gate drive, and intelligent low-power mode entry triggered by output voltage hysteresis. This allows the control logic to shut down entirely between switching cycles during light loads while maintaining regulation.
Can the MAX77505AEFB+T be used with a 4-cell alkaline battery input?
Yes - the MAX77505AEFB+T supports input voltages from 2.5V to 16V, fully covering the 6.0V (fresh) to ~4.2V (end-of-life) range of four series alkaline cells. Its 2.45V UVLO rising threshold ensures reliable startup even as battery voltage declines, making it ideal for long-duration alkaline-powered devices like door locks.
What is the function of the OUTS pin on the MAX77505AEFB+T?
The OUTS pin on the MAX77505AEFB+T is the high-impedance output voltage sensing input. It connects directly to the VOUT net for regulation feedback and also serves as the connection point for the internal 120Ω active discharge resistor during shutdown or UVLO events - ensuring rapid, controlled VOUT ramp-down.
Does the MAX77505AEFB+T require an external bootstrap capacitor?
Yes - the MAX77505AEFB+T requires a 0.22µF X7R ceramic capacitor connected between the BST and LX pins. This bootstrap capacitor supplies the gate drive voltage for the high-side MOSFET; omitting it or using insufficient capacitance causes erratic switching or complete failure to regulate.
MAX77505AEFB+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 10-UFQFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.5V
- Voltage - Input (Max):
- 16V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 4.6A (Switch)
- Frequency - Switching:
- 2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-FC2QFN (2x2)
MAX77505AEFB+T FAQ
1.How can I place an order for MAX77505AEFB+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX77505AEFB+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 MAX77505AEFB+T reliable?
The price and inventory of MAX77505AEFB+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX77505AEFB+T is usually 5 days.
3.What payment methods are accepted for MAX77505AEFB+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX77505AEFB+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX77505AEFB+T?
MAX77505AEFB+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX77505AEFB+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 MAX77505AEFB+T?
For technical support, including MAX77505AEFB+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX77505AEFB+T requirements.
6.How does Aetrix verify that MAX77505AEFB+T is sourced from the original manufacturer or authorized distributors?
All MAX77505AEFB+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 MAX77505AEFB+T meets industry standards.
7.What is the process for return or replacement of MAX77505AEFB+T?
All MAX77505AEFB+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX77505AEFB+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 MAX77505AEFB+T part is unused and in its original packaging.
Return procedure for MAX77505AEFB+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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