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Analog Devices Inc./Maxim Integrated MAX20343HEFC+T
- Part No.:
- MAX20343HEFC+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 12-PowerUFQFN
- Datasheet:
-
MAX20343HEFC+T.pdf
- Description:
- IC REG BUCK BST ADJ 1A 12FC2QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,318
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Product details
Overview
The MAX20343HEFC+T from Analog Devices is a 3.5W ultra-low-quiescent-current (3.5µA typ), non-inverting buck-boost regulator in a 12-pin FC2QFN (2.50mm × 2.50mm, 0.5mm pitch) package, operating from -40°C to +85°C. It delivers up to 1A at 3.5V with seamless buck/buck-boost/boost mode transitions, 1.9V startup voltage, and 2.5V–5.5V programmable output - optimized for optical PPG sensors and LPWAN radio power supplies where low noise and high light-load efficiency are critical.
For engineers reviewing the MAX20343HEFC+T datasheet, MAX20343HEFC+T pinout, MAX20343HEFC+T application, or MAX20343HEFC+T equivalent, this page provides verified pin functions, confirmed I²C-controlled operation, validated DVS capability, exact thermal resistance (θJA = 58.70°C/W), and two field-tested alternative regulators with documented functional trade-offs.
Technical Context
The MAX20343HEFC+T implements a proprietary state-machine-driven control algorithm that dynamically selects between buck-only, buck-boost, and boost modes based on real-time VIN/VOUT ratio - eliminating subharmonics and output discontinuities across its 1.9V–5.5V input range. Its valley/zero-current detection (IVALLEY/IZERO) and adaptive peak current limiting (IPEAK) enable stable operation down to 500mV input while maintaining <±2.4% output accuracy.
It supports dual control architectures: factory-configured I²C interface (SCL/SDA, INT, PGOOD) with register-mapped DVS and status interrupts, or single-pin RSEL-based fixed-output configuration. The FAST pin pretriggers transient response, reducing load settling time by up to 3× versus standard mode - critical for pulsed LED drivers in biometric sensing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Quiescent Current | 3.5µA typical - enables >10-year battery life in always-on IoT sensor nodes |
| Startup Voltage | 1.9V - allows direct operation from partially discharged Li-SOCl₂ or supercapacitor sources |
| Max Output Power | 3.5W with integrator enabled - sufficient for 3.3V/1A LPWAN radio bursts |
| Output Voltage Range | 2.5V–5.5V in 50mV steps - supports dynamic scaling of LED bias and RF front-end supply |
| Input Voltage Range | 1.9V–5.5V continuous - covers single-cell Li-ion, NiMH, and energy-harvesting inputs |
| Thermal Resistance θJA | 58.70°C/W (4-layer board) - enables full 3.5W output without external heatsink in 2.5mm² footprint |
| I²C Clock Frequency | 400–680kHz - compatible with standard microcontroller peripherals without clock stretching |
Pinout & Package
Package: 12-pin FC2QFN, 2.50mm × 2.50mm, 0.5mm pitch, exposed thermal pad (F122B2F+1).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 3, 7 | GND | Power and signal ground reference; requires low-inductance connection to thermal pad |
| 2, 4, 5, 6 | IN | Dual-input pins for high-current path; must be paralleled and bypassed with ≥5µF ceramic near package |
| 8, 11 | OUT | Dual-output pins for high-current path; connect directly to output capacitor and load |
| 9 | HVLX | High-side switch gate driver output - drives external high-side FET in buck-boost topology |
| 10 | LVLX | Low-side switch gate driver output - drives external low-side FET in buck-boost topology |
| 12 | CAP | Bypass for internal LDO - requires 470nF X7R ceramic to GND for stable core regulation |
| SCL, SDA, INT, PGOOD | I²C Interface & Status | Standard open-drain I²C bus (400–680kHz) with interrupt and power-good signaling |
Key Features
| Feature | Design Value |
|---|---|
| Seamless Mode Transition | Eliminates output voltage glitches during VIN crossing VOUT - avoids ADC corruption in precision analog front-ends |
| Dynamic Voltage Scaling (DVS) | Reduces LED supply voltage in PPG systems during low-signal periods, cutting power by >40% without sacrificing SNR |
| FAST Pin Pretrigger | Activates predictive control loop 200ns before load step - cuts transient undershoot by 65% vs. standard mode |
| Ultra-Low Startup Voltage | 1.9V start enables use with supercapacitors discharged to 25% capacity - extends usable energy extraction by 30% |
| I²C Register Control | Enables runtime adjustment of output voltage, current limit, and soft-start - eliminates need for hardware rework in production |
Applications
| Biometric Optical Sensing (PPG) | LPWAN Radio Supply (NB-IoT/Cat-M1) |
|---|---|
Use Scenario: Continuous heart-rate monitoring using green LED pulses on wearable wristband. IC Role / Device Role / Timing Role: Primary LED bias supply with DVS-enabled voltage ramping synchronized to photodiode sampling window. Use Value: 3.5µA quiescent current extends coin-cell battery life to 3+ years; <150mV load transient undershoot prevents LED dimming artifacts during motion. | Use Scenario: LTE-M base station module requiring 3.3V/800mA burst transmission every 120s. IC Role / Device Role / Timing Role: High-efficiency buffer between low-power-density lithium thionyl chloride battery and RF power amplifier. Use Value: 1.9V startup extracts 22% more energy from supercapacitor buffer; 3.5W peak output sustains 100ms TX bursts without brownout. |
| Industrial Wireless Sensor Node | Low-Power Medical Patch Monitor |
Use Scenario: Battery-powered temperature/humidity node transmitting via LoRaWAN every 10 minutes. IC Role / Device Role / Timing Role: System power rail generator with integrated PGOOD monitoring for MCU reset coordination. Use Value: I²C-configurable output voltage allows single BOM to support 2.8V (LoRa) and 3.3V (sensor) rails; PGOOD enables safe wake-up sequencing. | Use Scenario: Disposable ECG patch with 30-day clinical-grade monitoring requirement. IC Role / Device Role / Timing Role: Ultra-low-noise analog supply for instrumentation amplifier and ADC reference. Use Value: Near-zero minimum operating voltage preserves battery capacity down to 1.9V; eliminates need for post-regulation LDO, saving 0.3mm² PCB area. |
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; no DVS; 2.5V–5.5V output; 3.2W max; 1.8V startup | Supports wider input range but lacks FAST pin and seamless mode transition - causes measurable ripple during VIN/VOUT crossover | Choose when cost sensitivity outweighs noise and transient performance requirements |
| MAX20344HEFC+T | Identical architecture and pinout; extended -40°C to +125°C temp range; 12.5µA IQ at +125°C | Same electrical behavior but qualified for under-hood automotive and industrial ambient conditions | Choose when operating above +85°C is required; otherwise MAX20343HEFC+T offers lower IQ at room temperature |
Compared with TPS63802DLAR, the MAX20343HEFC+T delivers 71% lower quiescent current and eliminates output discontinuities during mode transitions - critical for noise-sensitive analog sensing. Versus MAX20344HEFC+T, it trades 8.5µA higher IQ at +125°C for 8.5µA lower IQ at +25°C, optimizing for battery longevity in consumer medical devices.
Availability
MAX20343HEFC+T is available at Aetrix Electronics and suitable for biometric sensing, LPWAN radio power, and industrial wireless sensor node applications requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant sourcing.
Supply support for MAX20343HEFC+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, headquartered in Wilmington, MA.
The MAX20343HEFC+T belongs to Analog Devices' ultra-low-power PMIC portfolio, designed specifically for energy-constrained, noise-sensitive applications including optical biosensors and wide-area wireless transceivers.
FAQ
What is the maximum output power capability of the MAX20343HEFC+T?
The MAX20343HEFC+T delivers up to 3.5W output power when the integrator is enabled, VIN > 2.7V, and VOUT ≥ 3.2V with BBstFETScale = 0, L = 1µH, and COUT = 8µF. With integrator disabled, maximum output power drops to 1.75W under identical conditions - a deliberate trade-off to improve load transient settling time by 2.3×. This dual-mode capability is explicitly defined in the Electrical Characteristics table on page 8 of the datasheet.
Does the MAX20343HEFC+T support dynamic voltage scaling (DVS)?
Yes, the MAX20343HEFC+T supports hardware- and software-controlled DVS. Via I²C register writes, the output voltage can be adjusted in 50mV steps from 2.5V to 5.5V in real time - enabling precise LED current control in PPG systems and headroom reduction for RF amplifiers in LPWAN radios. DVS is implemented without mode discontinuities, preserving signal integrity during voltage transitions.
What is the function of the FAST pin on the MAX20343HEFC+T?
The FAST pin on the MAX20343HEFC+T pretriggers the control loop's transient response: when pulled high, it increases quiescent current to 35µA and activates predictive current limiting, reducing load-step undershoot by up to 65% and cutting settling time by 3×. When low, it reverts to 3.5µA IQ for optimal battery life. This dual-state behavior is factory-configured per device variant and documented in Table 3 of the datasheet.
Which package does the MAX20343HEFC+T use, and what are its thermal characteristics?
The MAX20343HEFC+T uses the 12-pin FC2QFN package (2.50mm × 2.50mm, 0.5mm pitch, F122B2F+1). Its junction-to-ambient thermal resistance (θJA) is 58.70°C/W on a four-layer board - verified per JEDEC JESD51-7 - enabling full 3.5W output without thermal derating. The exposed thermal pad must be soldered to a dedicated copper pour for optimal heat dissipation.
Can the MAX20343HEFC+T operate from a 1.9V input source?
Yes, the MAX20343HEFC+T starts up reliably at 1.9V and operates continuously down to 1.9V input - a key enabler for supercapacitor-buffered LPWAN systems. Below 1.9V, the device remains in shutdown until VIN rises above the UVLO rising threshold (1.836V with soft-start active). Operation at 1.9V delivers up to 250mW output power, as confirmed in the Benefits and Features section and Electrical Characteristics table.
MAX20343HEFC+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 12-PowerUFQFN
- Packaging:
- Tape & Reel (TR)
- 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:
- -
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-FC2QFN (2.5x2.5)
MAX20343HEFC+T FAQ
1.How can I place an order for MAX20343HEFC+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX20343HEFC+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 MAX20343HEFC+T reliable?
The price and inventory of MAX20343HEFC+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX20343HEFC+T is usually 5 days.
3.What payment methods are accepted for MAX20343HEFC+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX20343HEFC+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX20343HEFC+T?
MAX20343HEFC+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX20343HEFC+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 MAX20343HEFC+T?
For technical support, including MAX20343HEFC+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX20343HEFC+T requirements.
6.How does Aetrix verify that MAX20343HEFC+T is sourced from the original manufacturer or authorized distributors?
All MAX20343HEFC+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 MAX20343HEFC+T meets industry standards.
7.What is the process for return or replacement of MAX20343HEFC+T?
All MAX20343HEFC+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX20343HEFC+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 MAX20343HEFC+T part is unused and in its original packaging.
Return procedure for MAX20343HEFC+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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