IEEE 802.3bt PD Interface with Forward/Flyback Controller Features: IEEE 802.3af/at/bt Powered Device (PD) with Forward/Flyback Controller Supports Up to 71.3W PDs 5-Event Classification Sensing Superior Surge Protection (100V Absolute Maximum) Wide Junction Temperature Range (–40°C to 125°C) >94% End-to-End Efficiency with LT4321 Ideal Bridge External Hot Swap N-Channel MOSFET for Lowest Power Dissipation and Highest System Efficiency No-Opto Flyback Operation Auxiliary Power Support as Low as 9V Easy Migration of LTPoE++® PDs to IEEE 802.3bt PDs Pin Compatible with LT4276A/B/C 28-Lead 4mm × 5mm QFN Package

40VIN, 2.5A Silent Switcher Module Regulator Features: Complete Step-Down Switch Mode Power Supply Low Noise Silent Switcher® Architecture Wide Input Voltage Range: 3.4V to 40V Wide Output Voltage Range: 0.97V to 18V Wide Temperature Range: –40°C to 150°C (H-Grade) 2.8A Continuous for 5VOUT, 12VIN, 2MHz at 105°C (H-Grade) 3.5A Peak FMEA Compliant Pinout Output Stays at or Below Regulation Voltage During Adjacent Pin Short or if a Pin Is Left Floating Selectable Switching Frequency: 200kHz to 3MHz External Synchronization Low Quiescent Current: 25µA (5VOUT) Programmable Soft-Start Tiny, Low Profile 6.25mm × 6.25mm × 2.22mm BGA Package

40V, 2.5A, Low IQ Synchronous Step-Up Silent Switcher with PassThru Features: Silent Switcher® Architecture Ultralow EMI Emissions Optional Spread Spectrum Frequency Modulation Integrated 40V, 2.5A Power Switches Wide Input/Output Voltage Range: 2.7V to 40V Low VIN Pin Quiescent Current: 0.3μA in Shutdown 4μA in Burst Mode® Operation 15μA in PassThru™ Operation 100% Duty Cycle Capability for Synchronous MOSFET Adjustable and Synchronizable: 300kHz to 3MHz Pulse-Skipping or Burst Mode Operation at Light Load Output Soft-Start and Power Good Monitor Internal Compensation Accurate 1V Enable Pin Threshold Small 16-Lead (3mm × 3mm) LQFN Package AEC-Q100 Qualified for Automotive Applications

Nanopower Buck-Boost DC/DC with Energy Harvesting Battery Charger Features: Dual Input, Single Output DC/DCs with Input Prioritizer Energy Harvesting Input: 3.0V to 19V Buck DC/DC Battery Input: Up to 4.2V Buck-Boost DC/DC 10mA Shunt Battery Charger with Programmable Float Voltages: 3.45V, 4.0V, 4.1V, 4.2V Low Battery Disconnect Ultra Low Quiescent Current: 950nA at no Load Integrated Supercapacitor Balancer Up to 50mA of Output Current Programmable DC/DC Output Voltage, Buck UVLO, and Buck-Boost Peak Input Current Integrated Low-Loss Full-Wave Bridge Rectifier Input Protective Shunt: Up to 25mA at VIN ≥ 20V 5mm × 5mm QFN-32 Package

Dual Ultrathin 2A or Single 4A Step-Down DC/DC Module Regulator Features: Complete Solution in <1cm2 Wide Input Voltage Range: 3.6V to 20V 1.5V to 12V Output Voltage Dual 2A (3A Peak) or Single 4A Output Current ±1.5% Maximum Total Output Voltage Regulation Error Over Load, Line and Temperature Current Mode Control, Fast Transient Response External Frequency Synchronization Multiphase Parallelable with Current Sharing Output Voltage Tracking and Soft-Start Capability Selectable Burst Mode® Operation Overvoltage Input and Overtemperature Protection Power Good Indicators 6.25mm × 6.25mm × 1.82mm LGA and 6.25mm × 6.25mm × 2.42mm BGA Packages

Four ADC, Two DAC, Low Power Codec with Audio DSPs Features: Programmable FastDSP audio processing engine Up to 768 kHz sample rate Biquad filters, limiters, volume controls, mixing 28-bit SigmaDSP audio processing core Visually programmable using SigmaStudio Up to 50 MIPS performance Low latency, 24-bit ADCs and DACs 96 dB SNR (signal through PGA and ADC with A-weighted filter) 105 dB combined SNR (signal through DAC and headphone with A-weighted filter) Serial port fSYNC frequency from 8 kHz to 768 kHz 5 μs group delay (fS = 768 kHz) analog in to analog out with FastDSP bypass (zero instructions) 4 single-ended analog inputs, configurable as microphone or line inputs 8 digital microphone inputs 2 analog differential audio outputs, configurable as either line output or headphone driver PLL supporting any input clock rate from 30 kHz to 27 MHz Full-duplex, 4-channel ASRCs 2, 16-channel serial audio ports supporting I2S, left justified, or up to TDM16 8 interpolators and 8 decimators with flexible routing Power supplies Analog AVDD at 1.8 V typical Digital I/O IOVDD at 1.1 V to 1.98 V Digital DVDD at 0.9 V typical Low power (11.079 mW for typical stereo ANC settings) I2C and SPI control interfaces, self boot from I2C EEPROM Flexible GPIO 42-ball, 0.35 mm pitch, 2.695 mm × 2.320 mm WLCSP

LDO Voltage Regulators 20V 200mA LDO 3.3Vo

Non-Isolated PoL Module DC DC Converter 1 Output 0.6 ~ 5.5V - - 3A 4V - 20V Input

PHASE LOCK LOOP;

PHASE LOCK LOOP;