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Analog Devices Inc./Maxim Integrated MAX77505AEFB+
- Part No.:
- MAX77505AEFB+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 10-UFQFN
- Datasheet:
-
MAX77505AEFB+.pdf
- Description:
- IC REG BUCK ADJ 3A 10FC2QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,506
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Product details
Overview
MAX77505AEFB+ from Analog Devices is a 2.5V–16V input, 4.6A peak switching current, ultra-low quiescent current (800nA typ) hysteretic buck converter in a 10-lead FC2QFN (2.0mm × 2.0mm × 0.55mm) package. It delivers configurable output voltages from 0.8V to 5.5V via external RSEL resistor, features open-drain POKB, cycle-by-cycle current limiting, and thermal shutdown-optimized for battery-powered IoT devices like asset trackers and smart door locks requiring multi-year standby life.
For engineers reviewing the MAX77505AEFB+ datasheet, MAX77505AEFB+ pinout, MAX77505AEFB+ application, or MAX77505AEFB+ equivalent, key selection criteria include its 70nA shutdown current, 2MHz CCM switching frequency, 95% peak efficiency at 3.3V out, ±2% output voltage accuracy, and integrated active discharge (120Ω) on disable-critical for low-power system sequencing and fast wake-up response.
Technical Context
The MAX77505AEFB+ employs a current-mode hysteretic control architecture with pseudo-fixed inductor ripple, enabling ~2MHz switching in continuous conduction mode (CCM) while dynamically adjusting frequency in discontinuous conduction mode (DCM) to maintain regulation across ultra-light loads. Its internal synchronous MOSFETs feature 50mΩ high-side and 45mΩ low-side RDS(ON), supporting up to 3A continuous output current with 4.6A peak switch current limit.
Startup includes soft-start with 1.6ms delay and reduced current limit (25% of ILIM), while power-down engages an active discharge path (120Ω between OUTS and AGND). The device uses analog SEL pin voltage division to select one of 30 preset output voltages, and monitors VOUT via OUTS pin with ±2% accuracy and 1.2–4.5% over-regulation hysteresis depending on VOUT range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 16V - supports single Li+ to 4-cell alkaline battery inputs without external regulators. |
| Output Voltage Range | 0.8V to 5.5V - set by 1% RSEL resistor; enables precise rail generation for MCU cores, sensors, and RF ICs. |
| Quiescent Current | 800nA typ - sustains >10-year battery life in always-on sensor nodes with microamp-level sleep current. |
| Peak Switch Current Limit | 4.6A - ensures robust transient handling and inductor saturation margin for 3A continuous loads. |
| Switching Frequency | 2.0MHz (CCM) - allows use of compact 1.5µH inductors and minimizes EMI filtering requirements. |
| Output Voltage Accuracy | ±2% - guarantees stable supply for precision analog circuits and low-voltage logic without post-regulation. |
| Shutdown Current | 70nA - enables true zero-power off-state for tamper-detection or emergency cutoff modes. |
Pinout & Package
Package: 10-lead FC2QFN (2.0mm × 2.0mm × 0.55mm, 0.5mm pitch), thermally enhanced with exposed PGND pad.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PGND (Pin 1) | Power Ground | Main return path for high-current LX switching loop; must be connected to low-impedance PCB ground plane. |
| LX (Pin 2) | Switch Node | Connects to inductor; experiences full VIN-to-VOUT swing at 2MHz-requires short, wide trace to minimize EMI. |
| IN (Pin 3) | Input Power Supply | Accepts 2.5V–16V; bypassed with 10µF X7R ceramic capacitor placed adjacent to pin for high-frequency decoupling. |
| BST (Pin 4) | Bootstrap Supply | Drives high-side MOSFET gate; requires 0.22µF X7R capacitor between BST and LX for proper gate bias. |
| EN (Pin 5) | Enable Input | Active-high logic control (VIH = 1.2V); initiates soft-start and disables output with active discharge when pulled low. |
| SEL (Pin 6) | Voltage Selection | Analog input referenced to AGND; sets VOUT via 1% resistor (e.g., 200Ω → 0.8V, 100kΩ → 3.1V). |
| POKB (Pin 7) | Inverted Power-OK | Open-drain output (10kΩ pullup required); asserts low when VOUT is within ±7% of target (90–93% rising, 85–88% falling). |
| AGND (Pin 8) | Analog Ground | Reference for SEL, OUTS, VL, and POKB; must be star-connected to PGND at single point near IC. |
| VL (Pin 9) | LDO Bypass | Internal LDO output; bypassed with 2.2µF X7R capacitor to AGND to stabilize internal bias circuitry. |
| OUTS (Pin 10) | Output Voltage Sense | High-impedance feedback node; connects directly to VOUT via Kelvin trace for accurate regulation and load-step response. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-Low IQ (800nA) | Enables >10-year battery life in asset trackers with daily 10-second transmission bursts and 23h 59min sleep. |
| Configurable VOUT (0.8V–5.5V) | Eliminates need for external DAC or digital interface-single resistor selects exact rail for SoC core, I/O, or sensor supply. |
| Integrated Active Discharge (120Ω) | Drains output capacitors in <50ms after EN deassertion-prevents residual voltage from interfering with system reset or state retention. |
| Hiccup-Mode Overcurrent Protection | Enters 15ms fault holdoff after 16 consecutive current-limit events-prevents thermal runaway during sustained short-circuit conditions. |
| Thermal Shutdown with 20°C Hysteresis | Latches off at 150°C and auto-resets only after cooling to 130°C-ensures safe recovery without manual intervention in sealed enclosures. |
Applications
| Asset Tracking Devices | Smart Door Locks |
|---|---|
Use Scenario: GPS/GSM module powered by 2–3 cell Li+ battery, transmitting location every 6 hours with 5-second active window. IC Role / Device Role / Timing Role: Primary step-down regulator delivering 3.3V to MCU and radio; manages deep-sleep current budget and fast wake-up sequencing. Use Value: 800nA IQ extends 1000mAh battery life from 1.2 years to >7 years; POKB signal synchronizes MCU boot with stable VOUT. |
Use Scenario: Battery-powered electronic deadbolt using 4 alkaline cells, operating motor and BLE radio for user authentication. IC Role / Device Role / Timing Role: Main power converter supplying 3.0V to motor driver and 1.8V to BLE SoC; handles 3A motor surge with 4.6A ILIM headroom. Use Value: 2MHz switching avoids audible noise in quiet residential environments; active discharge prevents false lock/unlock due to floating VOUT. |
| Wearable Health Monitors | Smart Utility Meters |
Use Scenario: Optical heart-rate sensor worn 24/7, sampling biometrics every 30 seconds and transmitting data hourly via Bluetooth LE. IC Role / Device Role / Timing Role: Dual-rail generator (1.2V for sensor ASIC, 3.3V for BLE transceiver); regulates against battery voltage decay from 4.2V to 2.8V. Use Value: ±2% VOUT accuracy maintains ADC reference stability across temperature; 70nA shutdown current preserves charge during firmware updates. |
Use Scenario: AMI meter with NB-IoT modem, operating on lithium-thionyl chloride battery with 15-year design life and monthly data uploads. IC Role / Device Role / Timing Role: Primary DC-DC stage stepping down 3.6V battery to 1.8V for microcontroller and 3.3V for RF front-end. Use Value: 95% peak efficiency at 3.3V/10mA reduces self-heating in hermetically sealed meter housing; UVLO prevents brownout resets during cold-weather battery voltage sag. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62840DLCR | Lower IQ (300nA), but max input 5.5V and 2A output; no POKB or active discharge; 2.5mm × 2.5mm QFN-12. | Suitable for single-cell Li+ systems only; lacks UVLO and hiccup protection needed for multi-cell alkaline operation. | Select if IQ is paramount and input stays ≤5.5V; avoid for 4-cell alkaline or industrial-grade fault coverage. |
| MP2152GQZ-P | Higher IQ (2.5µA), 6A ILIM, 2.2MHz fixed-frequency PWM; no RSEL programming-requires external feedback resistors. | Better for high-transient apps (e.g., motor drivers), but 2.5µA IQ cuts battery life by 3× vs. MAX77505AEFB+ in long-idle scenarios. | Choose for cost-sensitive designs needing higher current and PWM predictability; not for nanoPower standby-critical systems. |
Compared with TPS62840DLCR and MP2152GQZ-P, the MAX77505AEFB+ uniquely balances ultra-low IQ (800nA), 16V input tolerance, resistor-programmable VOUT, and integrated protections-making it the only option qualified for 4-cell alkaline-powered asset trackers requiring >5-year battery life and robust fault handling.
Availability
MAX77505AEFB+ is available at Aetrix Electronics and suitable for IoT sensor nodes, smart access control systems, and wearable medical monitors requiring stable component supply across multi-year production cycles and battery-life-critical designs.
Supply support for MAX77505AEFB+ 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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets since 1965.
The MAX77505AEFB+ belongs to Analog Devices' nanoPower™ DC-DC converter family, engineered specifically for ultra-low-power battery-operated edge devices where multi-year operation and minimal quiescent draw are non-negotiable design constraints.
FAQ
What is the maximum continuous output current supported by the MAX77505AEFB+?
The MAX77505AEFB+ supports up to 3A continuous output current under typical thermal conditions (TA = 70°C, four-layer board). Its 4.6A peak switch current limit provides headroom for transient loads, but sustained operation above 3A requires careful thermal design and PCB copper area optimization per JEDEC JESD51-7 guidelines.
How does the MAX77505AEFB+ achieve 800nA quiescent current while maintaining regulation?
The MAX77505AEFB+ achieves 800nA IQ through Analog Devices' nanoPower Technology™, which combines ultra-low-leakage internal bias circuits, adaptive low-power mode (waking every 20ms to check VOUT), and hysteretic control that eliminates error amplifier and oscillator overhead. Regulation is maintained by monitoring OUTS voltage against VOUT_HYS thresholds and initiating brief LX switching only when necessary.
Can the MAX77505AEFB+ be used with a 4-cell alkaline battery input?
Yes-the MAX77505AEFB+ is explicitly rated for 2.5V–16V input, covering the full 6.4V (fresh) to 4.0V (end-of-life) range of 4-cell alkaline batteries. Its 2.45V UVLO rising threshold ensures reliable startup even as battery voltage declines, and its 70nA shutdown current prevents drain during storage.
What is the function of the OUTS pin on the MAX77505AEFB+?
The OUTS pin on the MAX77505AEFB+ is the high-impedance output voltage sensing input. It connects directly to the regulated VOUT rail (preferably via Kelvin trace) to provide feedback for regulation accuracy. Unlike traditional FB pins, OUTS enables precise monitoring without loading the output, contributing to ±2% output voltage accuracy across load and temperature.
Does the MAX77505AEFB+ require external compensation components?
No-the MAX77505AEFB+ uses internal current-mode hysteretic control with built-in compensation, eliminating the need for external RC networks or type-II/type-III compensators. This simplifies layout, reduces BOM count, and ensures stable operation with standard 1.5µH inductors and 10–22µF ceramic output capacitors as specified in the datasheet.
MAX77505AEFB+ 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:
- 3A
- 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+ FAQ
1.How can I place an order for MAX77505AEFB+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX77505AEFB+ 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+ reliable?
The price and inventory of MAX77505AEFB+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX77505AEFB+ is usually 5 days.
3.What payment methods are accepted for MAX77505AEFB+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX77505AEFB+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX77505AEFB+?
MAX77505AEFB+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX77505AEFB+ 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+?
For technical support, including MAX77505AEFB+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX77505AEFB+ requirements.
6.How does Aetrix verify that MAX77505AEFB+ is sourced from the original manufacturer or authorized distributors?
All MAX77505AEFB+ 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+ meets industry standards.
7.What is the process for return or replacement of MAX77505AEFB+?
All MAX77505AEFB+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX77505AEFB+, 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+ part is unused and in its original packaging.
Return procedure for MAX77505AEFB+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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