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Analog Devices Inc./Maxim Integrated MAX20344EAFC+
- Part No.:
- MAX20344EAFC+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 12-PowerUFQFN
- Datasheet:
-
MAX20344EAFC+.pdf
- Description:
- IC REG BUCK BST ADJ 1A 12FC2QFN
- Quantity:
- Payment:
- Shipping:
Inventory:140
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Product details
Overview
The MAX20344EAFC+ from Analog Devices is a high-efficiency, ultra-low quiescent current (3.5µA typ), 3.5W non-inverting buck-boost regulator in a 12-pin FC2QFN (2.50mm × 2.50mm, 0.5mm pitch) package, operating from –40°C to +125°C. It delivers regulated output from 2.5V to 5.5V with seamless buck/buck-boost/boost mode transitions, enabling stable power for optical PPG sensors and LPWAN radios under wide input voltage swings down to 1.9V startup.
For engineers reviewing the MAX20344EAFC+ datasheet, MAX20344EAFC+ pinout, MAX20344EAFC+ application, or MAX20344EAFC+ equivalent, key selection criteria include its 3.5µA quiescent current at light load, dynamic voltage scaling (DVS) support, FAST pin pretriggered transient response, I²C programmability, and extended industrial temperature range - all critical for battery-constrained, noise-sensitive IoT sensor nodes.
Technical Context
The MAX20344EAFC+ implements a proprietary multi-mode control algorithm that dynamically selects buck, buck-boost, or boost operation based on real-time VIN/VOUT ratio, eliminating subharmonics and discontinuities in output ripple. Its valley/zero-current detection (IVALLEY/IZERO) and adaptive peak current limiting (IPEAK) enable stable regulation across 1.9V–5.5V input while maintaining low-noise performance essential for photoplethysmography (PPG) LED drivers.
It supports two configuration modes: I²C-controlled (with SDA/SCL/INT pins) or single-pin-enabled (EN/PGOOD/INGOOD), both sharing identical core regulation architecture. The FAST pin provides hardware-triggered transient acceleration, and RSEL allows fixed-output voltage selection via external resistor - configurable per Table 3 in the datasheet without firmware dependency.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Quiescent Current | 3.5µA typical at 3.7V IN, 5V OUT - enables >10-year battery life in always-on wearable sensors |
| Output Power | 3.5W max (integrator enabled, BBstFETScale = 0) - sufficient for burst-mode LTE-M/NB-IoT radio transmission |
| Input Voltage Range | 1.9V startup, 1.8V–5.5V operating - extracts maximum energy from supercapacitors or depleted primary cells |
| Output Voltage Range | 2.5V–5.5V in 50mV steps - supports variable LED forward voltage or MCU core rail scaling |
| Operating Temp | –40°C to +125°C - qualified for under-hood automotive or industrial edge node deployment |
| Package | 12-pin FC2QFN, 2.50mm × 2.50mm, 0.5mm pitch - compact footprint with exposed thermal pad for high-power density |
| I²C Interface | 400–680kHz clock, slave address 0x02 - enables runtime DVS, fault monitoring, and status register reads |
Pinout & Package
MAX20344EAFC+ uses a 12-pin Flip-Chip QFN (FC2QFN) package measuring 2.50mm × 2.50mm with 0.5mm pitch and an exposed thermal pad. Pin assignment follows the I²C-controlled FC2QFN configuration per datasheet Figure 17.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CAP | Bypass capacitor connection | Requires 470nF ceramic to GND for internal LDO stability; decouples high-frequency switching noise |
| IN (Pins 3, 4) | Main input supply | Dual pins reduce IR drop and thermal resistance; bypass with ≥5µF effective capacitance near device |
| OUT (Pins 9, 10) | Regulated output | Dual pins lower output impedance; supports up to 3.5W continuous delivery into PPG LED or radio PA |
| HVLX / LVLX (Pins 5, 6, 7, 8) | High/Low-side switch node connections | Direct connection points to external inductor; layout symmetry minimizes EMI loop area |
| GND (Pin 12) | Power ground | Thermally enhanced pad beneath package; must be soldered to large PCB copper pour for θJA = 58.7°C/W |
| SCL / SDA / INT (Pins 1, 2, 11) | I²C interface and interrupt | Enable real-time telemetry (output voltage, fault flags) and dynamic DVS without MCU GPIO overhead |
Key Features
| Feature | Design Value |
|---|---|
| Seamless multi-mode transition | Eliminates output voltage glitches during VIN crossing VOUT - critical for noise-sensitive analog front-ends like PPG |
| Dynamic Voltage Scaling (DVS) | Reduces LED driver headroom in real time, cutting average power by up to 30% in optical sensing cycles |
| FAST pin pretrigger | Hardware-accelerated load transient response - settles within 15µs for 700mA step, avoiding brownout in radio TX bursts |
| Ultra-low 1.9V startup | Enables full utilization of supercapacitor discharge curve down to 1.9V - extends usable energy by ~18% vs. 2.3V-start competitors |
| Configurable integrator loop | Disable for faster settling (1.75W limit) or enable for higher power (3.5W) with guaranteed stability using standard 8µF output cap |
Applications
| Biometric Optical Sensing (PPG) | LPWAN Radio Supply (LTE-M/NB-IoT) |
|---|---|
Use Scenario: Wearable heart-rate monitor using green/red LEDs and ambient-light-cancelling photodiodes. IC Role / Device Role / Timing Role: Primary LED bias supply with DVS-synchronized voltage reduction during low-current sensing phases. Use Value: 3.5µA IQ and <150mV load transient undershoot preserve signal integrity at sub-100µA LED currents, enabling clinical-grade PPG SNR. | Use Scenario: Cellular IoT node transmitting short data bursts over LTE-M or NB-IoT networks powered by coin-cell or supercap. IC Role / Device Role / Timing Role: High-efficiency intermediate rail generator delivering 3.3V/5V to radio PA during 100–500ms TX windows. Use Value: 3.5W capability and 1.9V startup extract >92% of supercap energy, extending field-deployed node lifetime beyond 10 years. |
| Industrial Temperature Sensor Node | Low-Power Edge AI Inference Module |
Use Scenario: Wireless temperature probe in HVAC ducts or factory equipment enclosures with ambient temps up to +125°C. IC Role / Device Role / Timing Role: Main system power regulator for ultra-low-power MCU and precision ADC, operating continuously in harsh thermal environments. Use Value: –40°C to +125°C rating and 58.7°C/W θJA ensure reliable regulation without derating, even in sealed metal enclosures. | Use Scenario: TinyML accelerator module performing local inference on vibration or acoustic data before wireless upload. IC Role / Device Role / Timing Role: Adaptive supply for mixed-signal SoC with dynamic core voltage scaling between sleep (0.8V) and inference (1.2V) states. Use Value: I²C-controlled DVS reduces average SoC power by 22%, while FAST pin ensures glitch-free wake-up from deep sleep to full inference mode. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS63802DLAR | Higher 12µA IQ, 2.5V–5.5V input, 3.3V/5V fixed outputs only, no DVS or FAST pin | Lacks dynamic voltage scaling and hardware-accelerated transient response - unsuitable for PPG or burst-mode radios | Select when fixed-output simplicity outweighs ultra-low IQ and DVS needs |
| LTC3536EDHC#PBF | 5.5µA IQ, 1.8V–5.5V input, 2.5V–5.5V adjustable output, but no I²C interface or FAST pin | No digital control or hardware pretrigger - requires external circuitry for DVS or fast load response | Choose for analog-only designs where I²C telemetry and hardware acceleration are unnecessary |
Compared with TPS63802DLAR and LTC3536EDHC#PBF, the MAX20344EAFC+ uniquely combines sub-4µA quiescent current, I²C-programmable DVS, and a dedicated FAST pin - making it the only option capable of simultaneously meeting multi-year battery life, optical-sensor noise budgets, and LPWAN burst-power demands in a single 2.5mm × 2.5mm package.
Availability
MAX20344EAFC+ is available at Aetrix Electronics and suitable for biometric sensing, LPWAN radio modules, industrial temperature nodes, and edge AI inference systems requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for MAX20344EAFC+ 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 MAX20344EAFC+ belongs to the MAX20343/MAX20344 family of ultra-low IQ buck-boost regulators, designed specifically for energy-constrained, noise-sensitive applications such as optical biosensors and cellular IoT endpoints where every microamp and millivolt matters.
FAQ
What is the minimum input voltage required for MAX20344EAFC+ to start up?
The MAX20344EAFC+ requires a minimum input voltage of 1.9V to initiate startup, as specified in the Electrical Characteristics table. This ultra-low startup threshold allows the device to operate deep into the discharge curve of supercapacitors or primary batteries, maximizing usable energy. Below 1.9V, the internal charge pump cannot initialize, and the device remains in undervoltage lockout. The MAX20344EAFC+ maintains regulation down to 1.8V once running, supporting extended runtime in energy-harvesting or backup-power scenarios.
Does MAX20344EAFC+ support dynamic voltage scaling (DVS), and how is it implemented?
Yes, the MAX20344EAFC+ supports Dynamic Voltage Scaling (DVS) via its I²C interface. By writing to the VOUT_SET register (address 0x01), the output voltage can be adjusted in 50mV steps from 2.5V to 5.5V in real time - enabling precise headroom control for LEDs or MCUs. DVS reduces power dissipation during low-activity periods (e.g., PPG idle phase) and improves overall system efficiency. The MAX20344EAFC+ also supports hardware-triggered DVS via the FAST pin, which preconditions the control loop for rapid voltage transitions without software latency.
What is the function of the FAST pin on MAX20344EAFC+?
The FAST pin on the MAX20344EAFC+ is a hardware-accelerated load transient response control. When pulled high, it increases internal bias currents to reduce output voltage undershoot during sudden load steps (e.g., radio PA turn-on), achieving <15µs settling time for 700mA transients. When low, it reverts to ultra-low-quiescent-current mode (3.5µA). This dual-mode operation allows designers to trade off static power for dynamic performance only when needed - a key advantage for intermittent high-power applications like LPWAN transmission.
Can MAX20344EAFC+ be used without I²C communication?
Yes, the MAX20344EAFC+ is available in both I²C-controlled and single-pin-enabled variants. The MAX20344EAFC+ specifically is the I²C version (confirmed by "EAFC+" suffix and FC2QFN pinout including SDA/SCL/INT). However, if I²C is unused, the device defaults to factory-programmed settings: VOUT = 3.3V (or other fixed value per RSEL configuration), DVS disabled, and standard startup behavior. All safety features (PGOOD, UVLO, thermal shutdown) remain fully functional without I²C, making it viable for simple fixed-output applications with optional telemetry upgrade path.
What thermal performance can be expected from MAX20344EAFC+ in a standard 4-layer PCB?
On a standard 4-layer PCB with adequate copper pour, the MAX20344EAFC+ exhibits a junction-to-ambient thermal resistance (θJA) of 58.7°C/W, as documented in the Package Information section. At 3.5W output power and 25°C ambient, this results in a worst-case junction temperature rise of ~205°C - exceeding the 150°C absolute maximum. Therefore, derating is required: maximum continuous power is ~2.5W at 25°C ambient or ~1.75W at 85°C ambient. Use of the exposed thermal pad soldered to inner-layer copper planes and thermal vias is mandatory to achieve rated performance and reliability.
MAX20344EAFC+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 12-PowerUFQFN
- Packaging:
- Strip
- Product Status:
- Active
- Function:
- Step-Up/Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck-Boost
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 1.9V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 1A
- Frequency - Switching:
- 680kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-FC2QFN (2.5x2.5)
MAX20344EAFC+ FAQ
1.How can I place an order for MAX20344EAFC+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX20344EAFC+ 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 MAX20344EAFC+ reliable?
The price and inventory of MAX20344EAFC+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX20344EAFC+ is usually 5 days.
3.What payment methods are accepted for MAX20344EAFC+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX20344EAFC+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX20344EAFC+?
MAX20344EAFC+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX20344EAFC+ 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 MAX20344EAFC+?
For technical support, including MAX20344EAFC+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX20344EAFC+ requirements.
6.How does Aetrix verify that MAX20344EAFC+ is sourced from the original manufacturer or authorized distributors?
All MAX20344EAFC+ 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 MAX20344EAFC+ meets industry standards.
7.What is the process for return or replacement of MAX20344EAFC+?
All MAX20344EAFC+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX20344EAFC+, 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 MAX20344EAFC+ part is unused and in its original packaging.
Return procedure for MAX20344EAFC+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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