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Analog Devices Inc./Maxim Integrated MAX77324EWTAD+
- Part No.:
- MAX77324EWTAD+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 6-WFBGA, WLBGA
- Datasheet:
-
MAX77324EWTAD+.pdf
- Description:
- IC REG BUCK PWM 1.5A 6WLP
- Quantity:
- Payment:
- Shipping:
Inventory:3,346
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Product details
Overview
MAX77324EWTAD+ from Analog Devices is a single-channel synchronous step-down (buck) converter delivering up to 1.5A output current, operating from 2.5V–4.8V input (Li⁺ battery compatible), with adjustable 0.6V–2.0V output voltage (±2% accuracy), 40µA quiescent current in SKIP mode, and 93% peak efficiency at 3.8VIN/1.8VOUT. It is optimized for space-constrained portable and wearable devices requiring high light-load efficiency.
For engineers reviewing the MAX77324EWTAD+ datasheet, MAX77324EWTAD+ pinout, MAX77324EWTAD+ application, or MAX77324EWTAD+ equivalent, key selection criteria include its automatic SKIP/PWM mode transition, 2MHz nominal switching frequency, 1.22mm × 0.85mm 6-bump WLP package, integrated active output discharge, and cycle-by-cycle overcurrent protection.
Technical Context
The MAX77324EWTAD+ employs Maxim's proprietary Quick-PWM™ constant-on-time control architecture, enabling immediate load transient response and pseudo-constant switching frequency across wide VIN/VOUT ratios. Its internal high-side PMOS (100mΩ RDS(ON)) and low-side NMOS (50mΩ RDS(ON)) eliminate external diodes and enable synchronous rectification.
It features automatic mode transition between SKIP (for <100mA loads, 40µA IQ) and PWM (2MHz fixed-frequency, 10mVPP ripple), with dedicated EN pin (1.2V logic-high threshold), soft-start (2.34mV/µs FB slew rate), and built-in protections including UVLO (2.65V rising), thermal shutdown (165°C), and active LX-to-PGND discharge (100Ω).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 1.5A continuous - supports core voltage rail for microcontrollers and sensors in compact battery-powered systems. |
| Input Voltage Range | 2.5V to 4.8V - fully covers single-cell Li⁺ battery discharge profile (3.0V–4.2V typical) with margin. |
| Output Voltage Range | 0.6V to 2.0V, ±2% accuracy - enables precise core supply for low-voltage SoCs and RF ICs via external resistor divider. |
| Quiescent Current | 40µA in SKIP mode - extends battery life in always-on sensor nodes and wearables during standby. |
| Switching Frequency | 2MHz nominal - allows use of tiny 0603 0.47µH inductor, minimizing solution footprint to 6.89mm². |
| Package | 1.22mm × 0.85mm, 6-bump WLP - ultra-miniature footprint compatible with high-density PCB layouts in wearables and IoT edge nodes. |
| Protections | UVLO, thermal shutdown (165°C), cycle-by-cycle OCP, active output discharge - ensures robust operation under fault conditions without external circuitry. |
Pinout & Package
MAX77324EWTAD+ uses a 1.22mm × 0.85mm, 0.4mm pitch, 6-bump wafer-level package (WLP, package code W60H1+1). Bumps are arranged in a 2×3 grid (A1–B3) on the bottom side.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 IN | Power Input | Bypassed to PGND with 10µF ceramic capacitor; handles 2.5V–4.8V input with ≤5.5V absolute max rating. |
| A2 LX | Switching Node | Connects to inductor; integrates high-side PMOS and low-side NMOS; clamped internally to PGND and VIN. |
| A3 PGND | Power Ground | High-current return path for inductor and MOSFETs; must be connected to AGND on PCB via low-inductance route. |
| B1 EN | Enable Input | Active-high logic input (1.2V min high, 0.4V max low); includes 500kΩ internal pulldown; controls startup/shutdown sequence. |
| B2 AGND | Analog Ground | Reference for feedback and internal bias circuits; must be tied to PGND on PCB to avoid noise coupling. |
| B3 FB | Feedback Input | Senses output voltage via external resistor divider; regulates VOUT to 0.6V reference with ±2% accuracy over temperature. |
Key Features
| Feature | Design Value |
|---|---|
| Automatic SKIP/PWM mode transition | Reduces quiescent current to 40µA at light loads while maintaining 2MHz PWM stability under full load - eliminates manual mode selection. |
| Integrated active output discharge | 100Ω internal resistor from LX to PGND discharges output capacitor when disabled - prevents residual voltage hold-up in power sequencing. |
| Quick-PWM™ control scheme | Delivers <30mV load transient deviation (0→750mA in 6µs) and <30mV line transient deviation (3.4V→2.9V in 25µs) - critical for real-time sensor and MCU applications. |
| On-resistance current sensing | Eliminates external sense resistors by using internal MOSFET RDS(ON) - improves efficiency and reduces BOM count and board area. |
| Ultra-small total solution size | 6.89mm² footprint using 0603 0.47µH inductor and standard 0402/0603 capacitors - enables integration into sub-10mm² wearable modules. |
Applications
| Wearable Health Monitor | Smart Bluetooth Earbud |
|---|---|
Use Scenario: Continuous ECG/PPG sensing with ultra-low-power MCU and analog front-end, powered by coin-cell or small Li⁺ battery. IC Role / Device Role / Timing Role: Primary core voltage regulator supplying 0.9V/1.0V to ARM Cortex-M4F MCU and ADC, dynamically adjusting mode based on sensor activity. Use Value: 40µA quiescent current in SKIP mode extends battery runtime >7 days; 2MHz switching avoids audible noise in audio-sensitive environments. | Use Scenario: Dual-core Bluetooth LE SoC with integrated DSP and RF transceiver operating from single 3.7V Li⁺ cell. IC Role / Device Role / Timing Role: Buck converter generating stable 1.1V digital core rail and 1.8V I/O rail (via second stage), with fast transient response to burst-mode radio transmission. Use Value: 30mV load transient deviation ensures clean supply during TX bursts; 6.89mm² solution fits within tight earbud cavity constraints. |
| Industrial Wireless Sensor Node | Compact IoT Gateway Module |
Use Scenario: LoRaWAN or NB-IoT node with ultra-low-duty-cycle operation, sleeping for hours between sensor reads and transmissions. IC Role / Device Role / Timing Role: Main power regulator for MCU, RF transceiver, and environmental sensors; enabled only during active periods via host-controlled EN signal. Use Value: 1µA shutdown current minimizes leakage during deep sleep; UVLO and thermal shutdown ensure reliability in unattended outdoor deployments. | Use Scenario: Edge AI inference module (e.g., Cortex-M7 + NPU) in smart home hub, requiring multiple tightly regulated rails in minimal volume. IC Role / Device Role / Timing Role: Secondary buck supplying 1.2V core voltage to AI accelerator, complementing primary PMIC; synchronized via EN to match processing workload. Use Value: ±2% output accuracy maintains timing margins for high-speed interfaces; 100Ω active discharge enables safe hot-swap and rail sequencing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX77324GEWTAD+ | Fixed PWM-only operation (no SKIP mode); identical package, pinout, and electrical specs except IQ = 100µA (typ) in no-load PWM vs. 40µA in SKIP. | Lacks light-load efficiency optimization; suitable only where constant-frequency operation is mandatory (e.g., EMI-sensitive RF sections). | Select MAX77324GEWTAD+ only if deterministic 2MHz switching is required; otherwise MAX77324EWTAD+ delivers superior battery life. |
| TI TPS628651RQYR | 1.2A output, 1.8V–5.5V input, 0.6V–3.3V output, 2.5MHz switching, 25µA IQ; 1.2mm × 0.8mm 6-pin WSON package (different pinout). | Lower current rating and incompatible pin mapping; requires PCB redesign and new layout validation. | Consider only for new designs where 25µA IQ is critical and 1.2A suffices; not a drop-in replacement due to pinout and control differences. |
Compared with MAX77324GEWTAD+, MAX77324EWTAD+ provides 60% lower quiescent current at light loads without sacrificing transient performance or protection features; versus TPS628651RQYR, it offers higher current capability and proven integration in space-constrained wearables but requires attention to EN logic thresholds and feedback divider design.
Availability
MAX77324EWTAD+ is available at Aetrix Electronics and suitable for wearable health monitors, Bluetooth earbuds, industrial wireless sensor nodes, and compact IoT gateway modules requiring stable component supply and long-term lifecycle support.
Supply support for MAX77324EWTAD+ 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, headquartered in Wilmington, MA.
The MAX77324 product line is designed specifically for ultra-compact, battery-powered portable electronics requiring high efficiency at both light and full load, with emphasis on minimal solution size and robust protection in constrained form factors.
FAQ
What is the maximum output current supported by the MAX77324EWTAD+?
The MAX77324EWTAD+ supports up to 1.5A of continuous output current. This is validated across the full operating temperature range (-40°C to +85°C) and input voltage range (2.5V to 4.8V). Peak current limit is specified at 3.00A (typical), ensuring reliable regulation even under transient overload conditions. The device maintains this rating using its integrated 100mΩ high-side PMOS and 50mΩ low-side NMOS switches.
Does the MAX77324EWTAD+ require external components to set the output voltage?
Yes, the MAX77324EWTAD+ requires an external resistor divider connected between VOUT, FB, and AGND to set the output voltage from 0.6V to 2.0V. For example, to achieve 1.2V output, use RTOP = 30.1kΩ and RBOT = 30.1kΩ (1% tolerance recommended). A 220pF capacitor (CTOP) is also recommended across RTOP for stability. No external compensation network is needed due to the internal Quick-PWM™ control loop.
How does the SKIP mode improve efficiency in the MAX77324EWTAD+?
SKIP mode in the MAX77324EWTAD+ reduces switching activity at light loads (<100mA), lowering quiescent current to 40µA - a 60% reduction versus its PWM-only variant. This directly extends battery life in standby or sensor-readout phases. During SKIP, pulse frequency drops while maintaining regulation, and the device automatically resumes 2MHz PWM operation as load increases, ensuring seamless transition without output disturbance.
What protection features are integrated into the MAX77324EWTAD+?
The MAX77324EWTAD+ integrates undervoltage lockout (UVLO), soft-start, active output discharge (100Ω LX-to-PGND), cycle-by-cycle overcurrent protection (OCP), and thermal shutdown (165°C with 15°C hysteresis). These functions operate autonomously without external components. For instance, during short-circuit events, the device enters hiccup mode (8µs retry delay after 8 consecutive current-limit cycles), preventing thermal runaway and enabling safe recovery.
Can the MAX77324EWTAD+ start up into a pre-biased output?
Yes, the MAX77324EWTAD+ supports pre-bias startup. If the output voltage is already present and below the target VOUT, the device ramps up monotonically at the programmed FB slew rate (2.34mV/µs typical) without reverse current flow. If the pre-bias exceeds the target, no switching occurs during soft-start - protecting downstream circuitry. This behavior is inherent to the internal control architecture and requires no external configuration.
MAX77324EWTAD+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 6-WFBGA, WLBGA
- Packaging:
- Strip
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- PWM
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.5V
- Voltage - Input (Max):
- 4.8V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 2V
- Current - Output:
- 1.5A
- Frequency - Switching:
- 2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-WLP (1.22x0.85)
MAX77324EWTAD+ FAQ
1.How can I place an order for MAX77324EWTAD+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX77324EWTAD+ 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 MAX77324EWTAD+ reliable?
The price and inventory of MAX77324EWTAD+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX77324EWTAD+ is usually 5 days.
3.What payment methods are accepted for MAX77324EWTAD+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX77324EWTAD+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX77324EWTAD+?
MAX77324EWTAD+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX77324EWTAD+ 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 MAX77324EWTAD+?
For technical support, including MAX77324EWTAD+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX77324EWTAD+ requirements.
6.How does Aetrix verify that MAX77324EWTAD+ is sourced from the original manufacturer or authorized distributors?
All MAX77324EWTAD+ 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 MAX77324EWTAD+ meets industry standards.
7.What is the process for return or replacement of MAX77324EWTAD+?
All MAX77324EWTAD+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX77324EWTAD+, 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 MAX77324EWTAD+ part is unused and in its original packaging.
Return procedure for MAX77324EWTAD+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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