Dual Channel, Configurable, IsolatedDigital Input Features: Dual channel, configurable, isolated digital input Programmable trip threshold On-chip debounce filter On-chip data and power Isolation Application circuit monitors wide voltage range 10 V dc to 300 V dc 8 V rms to 240 V rms ac (with 10 ms + pickup) Negative dc protected Programmable wetting current Pulse up to 50 mA Constant current up to 6.3 mA Safety and regulatory approvals UL recognition 3750 V rms for 1 minute per UL 1577 CSA Component Acceptance Notice #5A (pending) CSA 61010-1: 300 V rms VDE certificate of conformity (pending) DIN V VDE V 0884-11 (VDE V 0884-11):2017-1 VIORM = 565 V peak EMC robust solution supports relay protection system level requirements ADC samples available for system diagnostics Internal SAR ADC with PGA Single 3.3 V Supply Integrated isoPower, isolated dc-to-dc converter Interfaces SPI DOUTx output reflects state of digital input IRQ interrupt pin Operating temperature: −40°C to +125°C 20-lead, LGA package with 6.8 mm creepage

High Performance Polyphase Energy Measurement IC Features: 7 high performance analog-to-digital converters (ADCs) 101 dB signal-to-noise ratio (SNR) 10,000:1 dynamic range Wide input range: ±1 V, 0.707 V rms full scale Differential inputs ±25 ppm/°C maximum channel temperature drift (including ADC, internal VREF, and PGA drift) enabling Class 0.2 meters with standard external components Power quality measurements Line frequency: 1 measurement per phase Zero crossing detection, zero-crossing timeout Phase angle measurements Supports current transformers (CTs) and Rogowski coil (di/dt) sensors Multiple range phase/gain compensation for CTs Digital integrator for Rogowski coils Flexible waveform buffer Able to resample waveform to ensure 64 points per line cycle for ease of external harmonic analysis Events can trigger waveform storage Simplifies data collection for IEC 61000-4-7 harmonic analysis Advanced metrology feature set Total active power, volt-amperes reactive (VAR), volt-amperes (VA), watthour, VAR-hour, and VA-hour Fundamental VAR and VAR-hour Current and voltage rms per phase (xIRMS, xVRMS) Supports active energy standards: IEC 62053-21, IEC 62053-22; EN50470-3; OIML R46, ANSI C12.20 Supports reactive energy standards: IEC 62053-23, IEC 62053-4 High speed communication port 10 MHz serial peripheral interface (SPI)

User Defined Fault Protection and Detection, 0.8 pC QINJ, 8:1 Multiplexer Features: User defined secondary supplies set overvoltage level Overvoltage protection up to −55 V and +55 V Power-off protection up to −55 V and +55 V Overvoltage detection on source pins Minimum secondary supply level: 4.5 V single-supply Interrupt flags indicate fault status Low charge injection (QINJ): 0.8 pC Low drain/source on capacitance: 19 pF Latch-up immune under any circumstance Known state without digital inputs present VSS to VDD analog signal range ±5 V to ±22 V dual-supply operation 8V to 44 V single-supply operation Fully specified at ±15 V, ±20 V, +12 V, and +36 V 

0.4 CMOS, Dual DPDT Switch in WLCSP/LFCSP/TSSOP Features: 1.8 V to 5.5 V operation Ultralow on resistance 0.4 Ω typical 0.6 Ω maximum at 5 V supply Excellent audio performance, ultralow distortion 0.07 Ω typical 0.14 Ω maximum RON flatness High current carrying capability 400 mA continuous 600 mA peak current at 5 V Automotive temperature range: −40°C to +125°C Rail-to-rail switching operation Typical power consumption (<0.1 μW)

0 Hz/dc to 14 GHz, Single-Pole, Four-Throw MEMS Switch with Integrated Driver Features: Fully operational down to 0 Hz/dc On resistance: 2.9 Ω (maximum) Off leakage: 0.5 nA (maximum) −3 dB bandwidth 11 GHz (typical) for RF1, RF4 14 GHz (typical) for RF2, RF3 RF performance characteristics Insertion loss: 0.26 dB (typical) at 2.5 GHz Isolation: 24 dB (typical) at 2.5 GHz IIP3: 69 dBm (typical) RF power: 36 dBm (maximum) Actuation lifetime: 1 billion cycles (minimum) Hermetically sealed switch contacts On switching time: 75 μs (maximum) Integrated driver removes the need for an external driver Supply voltage: 3.0 V to 3.6 V CMOS-/LVTTL-compatible Parallel and SPI interface Independently controllable switches Switch is in an open state with no power supply present Requirement to avoid floating nodes on all RFx pins (see the Floating Node section in data sheet) 24-lead, 5 mm × 4 mm × 0.95 mm, LFCSP Operating temperature range: 0°C to 85°C

SPI Interface, 1.5 RON, 15 V/+12 V, Quad SPST Switch, Mux Configurable Features: SPI interface with error detection Includes CRC, invalid read/write address, and SCLK count error detection Supports burst mode and daisy-chain mode Industry-standard SPI Mode 0 and Mode 3 interface compatible Guaranteed break-before-make switching allowing external wiring of switches to deliver multiplexer configurations 1.5 typical on resistance at 25°C 0.3 typical on resistance flatness at 25°C 0.1 typical on resistance match between channels at 25°C VSS to VDD analog signal range Fully specified at ±15 V, ±5 V, and +12 V 1.8 V logic compatibility with 2.7 V ≤ VL ≤ 3.3 V 24-lead LFCSP

24 V to 220 V Precision Operational Amplifier Features: Wide range of operating voltages Dual-supply: ±12 V to ±110 V Asymmetrical supply operation: 24 V to 220 V Wide input common-mode voltage range: 3 V from rails High common-mode rejection ratio: 160 dB typical High AOL: 170 dB typical High slew rate 74 V/μs typical 24 V/μs typical with external input clamping diodes Low input bias current: 2 pA maximum Low input offset voltage: 1 mV maximum Low input offset voltage drift: 2 μV/°C maximum Low input voltage noise: 8 nV/√Hz typical at 10 kHz Wide small signal bandwidth: 10 MHz typical Resistor adjustable quiescent current: 0.6 mA to 3 mA (VS = ±110 V) Unity-gain stable Thermal monitoring Small footprint: 12-lead, 7 mm × 7 mm LFCSP compliant with IEC 61010-1 spacing Shutdown mode

Very Low Noise, Differential Amplifier and 5MHz Lowpass Filter Features: Programmable Differential Gain via Two External Resistors Adjustable Output Common Mode Voltage Operates and Specified with 3V, 5V, ±5V Supplies 0.5dB Ripple 4th Order Lowpass Filter with 5MHz Cutoff 82dB S/N with 3V Supply and 2VP-P Output Low Distortion, 2VP-P, 800Ω Load 1MHz: 93dBc 2nd, 96dBc 3rd Fully Differential Inputs and Outputs Compatible with Popular Differential Amplifier Pinouts Available in an SO-8 Package

Low IQ Synchronous Step-Down Controller Features: Wide Output Voltage Range: 0.8V ≤ VOUT ≤ 10V Low Operating IQ: 80µA OPTI-LOOP® Compensation Minimizes COUT ±1% Output Voltage Accuracy Wide VIN Range: 4V to 36V Operation Phase-Lockable Fixed Frequency 140kHz to 650kHz Dual N-Channel MOSFET Synchronous Drive Very Low Dropout Operation: 99% Duty Cycle Adjustable Output Voltage Soft-Start or Tracking Output Current Foldback Limiting Output Overvoltage Protection Low Shutdown IQ: 10µA Selectable Continuous, Pulse-Skipping or Burst Mode® Operation at Light Loads Small 16-Lead Narrow SSOP or 3mm × 5mm DFN Package

Single Switch Synchronous Forward Controller Features: Synchronous Rectifier Control for High Efficiency Programmable Volt-Second Clamp Output Power Levels from 25W to 500W Low Current Start-Up (LT1952: 460µA; VIN On/Off = 14.25V/8.75V) (LT1952-1: 400µA; VIN On/Off = 7.75V/6.5V) True PWM Soft-Start Low Stress Short Circuit Protection Precision 107mV Current Limit Threshold Adjustable Delay for Synchronous Timing Accurate Shutdown Threshold with Programmable Hysteresis Programmable Slope Compensation Programmable Leading Edge Blanking Programmable Frequency (100kHz to 500kHz) Synchronizable to an External Clock up to 1.5 • fOSC Internal 1.23V Reference 2.5V External Reference Current Mode Control Small 16-Pin SSOP Package