PolyPhase Synchronous Boost Controller with PassThru Features: 2-Phase Operation Reduces Required Input and Output Capacitance and Power Supply Induced Noise Synchronous Operation for Highest Efficiency and Reduced Heat Dissipation Wide VIN Range: 4.5V to 38V (40V Abs Max) and Operates Down to 2.5V After Start-Up Output Voltage Up to 60V ±1% 1.200V Reference Voltage RSENSE or Inductor DCR Current Sensing 100% Duty Cycle Capability for Synchronous MOSFET Low Quiescent Current: 135μA Phase-Lockable Frequency (75kHz to 850kHz) Programmable Fixed Frequency (50kHz to 900kHz) Power Good Output Voltage Monitor Low Shutdown Current, IQ < 8μA Internal LDO Powers Gate Drive from VBIAS or EXTVCC Thermally Enhanced Low Profile 28-Pin 4mm × 5mm QFN Package and Narrow SSOP Package 

High Efficiency, Synchronous, 4-Switch Buck-Boost Controller Features: Single Inductor Architecture Allows VIN Above, Below or Equal to the Regulated VOUT Programmable Input or Output Current Wide VIN Range: 4V to 38V 1% Output Voltage Accuracy: 0.8V < VOUT < 38V Synchronous Rectification: Up to 98% Efficiency Current Mode Control Phase-Lockable Fixed Frequency: 200kHz to 600kHz No Reverse Current During Start-Up Power Good Output Voltage Monitor Internal 5.5V LDO Quad N-Channel MOSFET Synchronous Drive VOUT Disconnected from VIN During Shutdown True Soft-Start and VOUT Short Protection, Even in Boost Mode Available in 28-Lead QFN (4mm × 5mm) and 28-Lead SSOP Packages

Adjustable Frequency Current Mode Flyback/Boost/SEPIC DC/DC Controller Features: VIN and VOUT Limited Only by External Components 4.5V Undervoltage Lockout Threshold Adjustable Slope Compensation Adjustable Overcurrent Protection with Automatic Restart Adjustable Operating Frequency (70kHz to 700kHz) With One External Resistor Synchronizable to an External Clock ±1.5% Reference Accuracy Only 100mV Current Sense Voltage Drop RUN Pin with Precision Threshold and Adjustable Hysteresis Programmable Soft-Start with One External Capacitor Low Quiescent Current: 360μA Small 10-Lead MSOP and 3mm × 3mm DFN

No RSENSE, Low EMI, Synchronous DC/DC Controller Features: No Current Sense Resistor Required Selectable Spread Spectrum Frequency Modulation for Low Noise Operation Constant Frequency Current Mode Operation for Excellent Line and Load Transient Response True PLL for Frequency Locking or Adjustment (Frequency Range: 250kHz to 750kHz) Wide VIN Range: 2.75V to 9.8V Wide VOUT Range: 0.6V to VIN 0.6V ±1.5% Reference Low Dropout Operation: 100% Duty Cycle Selectable Burst Mode®/Pulse-Skipping/Forced Continuous Operation Auxiliary Winding Regulation Internal Soft-Start Circuitry Output Overvoltage Protection Micropower Shutdown: IQ = 9µA Tiny Thermally Enhanced Leadless (3mm × 3mm) DFN and 10-lead MSOP Packages

RS232/RS485 Multiprotocol Transceivers with Integrated Termination Features: One RS485 and Two RS232 Transceivers 3V to 5.5V Supply Voltage 20Mbps RS485 and 500kbps RS232 Automatic Selection of Integrated RS485 (120Ω) and RS232 (5kΩ) Termination Resistors Half-/Full-Duplex RS485 Switching High ESD: ±26kV (LTC2870), ±16kV (LTC2871) Logic Loopback Mode 1.7V to 5.5V Logic Interface Supports Up to 256 RS485 Nodes RS485 Receiver Failsafe Eliminates UART Lockup H-Grade Available (–40°C to 125°C) Available in 28-Pin 4mm × 5mm QFN and TSSOP (LTC2870), and 38-Pin 5mm × 7mm QFN and TSSOP (LTC2871)

RS232/RS485 Multiprotocol Transceivers with Integrated Termination Features: One RS485 and Two RS232 Transceivers 3V to 5.5V Supply Voltage 20Mbps RS485 and 500kbps RS232 Automatic Selection of Integrated RS485 (120Ω) and RS232 (5kΩ) Termination Resistors Half-/Full-Duplex RS485 Switching High ESD: ±26kV (LTC2870), ±16kV (LTC2871) Logic Loopback Mode 1.7V to 5.5V Logic Interface Supports Up to 256 RS485 Nodes RS485 Receiver Failsafe Eliminates UART Lockup Available in 28-Pin 4mm × 5mm QFN and TSSOP (LTC2870), and 38-Pin 5mm × 7mm QFN and TSSOP (LTC2871)

RS232/RS485 Multiprotocol Transceivers with Integrated Termination Features: One RS485 and Two RS232 Transceivers 3V to 5.5V Supply Voltage 20Mbps RS485 and 500kbps RS232 Automatic Selection of Integrated RS485 (120Ω) and RS232 (5kΩ) Termination Resistors Half-/Full-Duplex RS485 Switching High ESD: ±26kV (LTC2870), ±16kV (LTC2871) Logic Loopback Mode 1.7V to 5.5V Logic Interface Supports Up to 256 RS485 Nodes RS485 Receiver Failsafe Eliminates UART Lockup Available in 28-Pin 4mm × 5mm QFN and TSSOP (LTC2870), and 38-Pin 5mm × 7mm QFN and TSSOP (LTC2871)

Single-Bus RS485/RS232 Multiprotocol Transceiver with Switchable Termination Features: One RS485 or One RS232 Transceiver 3V to 5.5V Supply Voltage Up to 20Mbps RS485 Slew-Controlled RS232 Operation: Selectable 1Mbps or 250kbps Automatic Selection of Integrated RS485 (120Ω) and RS232 (5kΩ) Termination Resistors High ESD: ±26kV HBM Logic Loopback Mode 1.7V to 5.5V Logic Interface Supports Up to 256 RS485 Nodes RS485 Receiver Failsafe Eliminates UART Lockup H-Grade Available (–40°C to 125°C) Available in 24-Pin 4mm × 5mm QFN Package

Quad IO-Link Master Hot Swap Controller and PHY Features:IO-Link® Compatible (COM1/COM2/COM3)8V to 34V OperationHot Swap™ Controller Protected Supply OutputsDiscrete Power MOSFETs for Ruggedness and FlexibilityConfigurable 100mA (4-Port), 200mA (2-Port), or 400mA (1-Port) CQ Drive CapabilityAutomatic Wake-Up Pulse GenerationAutomatic Cable SensingCQ Pins Protected to ±50VConfigurable L+ Current Limit with FoldbackShort Circuit, Input UV/OV and Thermal ProtectionOptional Interrupt and Auto-Retry after Faults2.9V to 5.5V Logic Supply for Flexible Digital InterfaceNo Damage or Latchup to ±8kV HBM ESD38-Lead (5mm × 7mm) QFN and TSSOP Packages

60V Rugged PROFIBUS RS485 Transceivers Features: PROFIBUS IEC 61158-2 Compliant Protected from Overvoltage Line Faults to ±60V ±52kV ESD Interface Pins, ±15kV All Other Pins ±2kV (Level 4) IEC61000-4-4 Fast Transient Burst ±25V Working Common Mode Range 20Mbps Maximum Baud Rate 1.65V to 5.5V Logic Supply Pin for Flexible Digital Interfacing (LTC2877) 5V Supply Can Operate Down to 3V for Low Power, Low Swing Applications Fully Balanced Differential Receiver Thresholds with 240mV Hysteresis for Superior Noise Tolerance and Low Duty Cycle Distortion Receiver Failsafe for Open, Shorted and Terminated Conditions Wide Operating Temperature Range: –40°C to 125°C Available in Small DFN and MSOP Packages

60V Rugged PROFIBUS RS485 Transceivers Features: PROFIBUS IEC 61158-2 Compliant Protected from Overvoltage Line Faults to ±60V ±52kV ESD Interface Pins, ±15kV All Other Pins ±2kV (Level 4) IEC61000-4-4 Fast Transient Burst ±25V Working Common Mode Range 20Mbps Maximum Baud Rate 1.65V to 5.5V Logic Supply Pin for Flexible Digital Interfacing (LTC2877) 5V Supply Can Operate Down to 3V for Low Power, Low Swing Applications Fully Balanced Differential Receiver Thresholds with 240mV Hysteresis for Superior Noise Tolerance and Low Duty Cycle Distortion Receiver Failsafe for Open, Shorted and Terminated Conditions Wide Operating Temperature Range: –40°C to 125°C Available in Small DFN and MSOP Packages

60V Rugged PROFIBUS RS485 Transceivers Features: PROFIBUS IEC 61158-2 Compliant Protected from Overvoltage Line Faults to ±60V ±52kV ESD Interface Pins, ±15kV All Other Pins ±2kV (Level 4) IEC61000-4-4 Fast Transient Burst ±25V Working Common Mode Range 20Mbps Maximum Baud Rate 1.65V to 5.5V Logic Supply Pin for Flexible Digital Interfacing (LTC2877) 5V Supply Can Operate Down to 3V for Low Power, Low Swing Applications Fully Balanced Differential Receiver Thresholds with 240mV Hysteresis for Superior Noise Tolerance and Low Duty Cycle Distortion Receiver Failsafe for Open, Shorted and Terminated Conditions Wide Operating Temperature Range: –40°C to 125°C Available in Small DFN and MSOP Packages

60V Rugged PROFIBUS RS485 Transceivers Features:PROFIBUS IEC 61158-2 CompliantProtected from Overvoltage Line Faults to ±60V±52kV ESD Interface Pins, ±15kV All Other Pins±2kV (Level 4) IEC61000-4-4 Fast Transient Burst±25V Working Common Mode Range20Mbps Maximum Baud Rate1.65V to 5.5V Logic Supply Pin for Flexible Digital Interfacing (LTC2877)5V Supply Can Operate Down to 3V for Low Power, Low Swing ApplicationsFully Balanced Differential Receiver Thresholds with240mV Hysteresis for Superior Noise Tolerance andLow Duty Cycle DistortionReceiver Failsafe for Open, Shorted and Terminated ConditionsWide Operating Temperature Range: –40°C to 125°CAvailable in Small DFN and MSOP Packages

60V Rugged PROFIBUS RS485 Transceivers Features:PROFIBUS IEC 61158-2 CompliantProtected from Overvoltage Line Faults to ±60V±52kV ESD Interface Pins, ±15kV All Other Pins±2kV (Level 4) IEC61000-4-4 Fast Transient Burst±25V Working Common Mode Range20Mbps Maximum Baud Rate1.65V to 5.5V Logic Supply Pin for Flexible Digital Interfacing (LTC2877)5V Supply Can Operate Down to 3V for Low Power, Low Swing ApplicationsFully Balanced Differential Receiver Thresholds with240mV Hysteresis for Superior Noise Tolerance andLow Duty Cycle DistortionReceiver Failsafe for Open, Shorted and Terminated ConditionsWide Operating Temperature Range: –40°C to 125°CAvailable in Small DFN and MSOP Packages

Programmable Quad Supply Monitor with Adjustable Reset Timer Features: Simultaneously Monitors Four Supplies 16 User Selectable Combinations of 5V, 3.3V, 3V, 2.5V, 1.8V, 1.5V and/or ±Adjustable Voltage Thresholds Guaranteed Threshold Accuracy: ±1.5% of Monitored Voltage Over Temperature Low Supply Current: 43µA Typ Adjustable Reset Time Small MSOP and 3mm × 3mm DFN Packages Manual Reset Pin Open-Drain RST Output (LTC2900-1) Push-Pull RST Output (LTC2900-2) Power Supply Glitch Immunity Guaranteed RST for VCC ≥ 1V

Programmable Quad Supply Monitor with Adjustable Reset and Watchdog Timers Features: Simultaneously Monitors Four Supplies 16 User Selectable Combinations of 5V, 3.3V, 3V, 2.5V, 1.8V, 1.5V and/or ±Adj Voltage Thresholds Guaranteed Threshold Accuracy: ±1.5% of Monitored Voltage Over Temperature Selectable Supply Tolerance: 5% and 10% Below Monitored Voltage (LTC2901-3/LTC2901-4) Low Supply Current: 43µA Typ Adjustable Reset Time Adjustable Watchdog Time Open-Drain RST Output (LTC2901-1/LTC2901-3) Push-Pull RST Output (LTC2901-2/LTC2901-4) Individual Nondelayed Monitor Output for Each Supply Power Supply Glitch Immunity Guaranteed RST for VCC ≥ 1V 16-Lead Narrow SSOP Package

Programmable Quad Supply Monitor with Adjustable Reset and Watchdog Timers Features: Simultaneously Monitors Four Supplies 16 User Selectable Combinations of 5V, 3.3V, 3V, 2.5V, 1.8V, 1.5V and/or ±Adj Voltage Thresholds Guaranteed Threshold Accuracy: ±1.5% of Monitored Voltage Over Temperature Selectable Supply Tolerance: 5% and 10% Below Monitored Voltage (LTC2901-3/LTC2901-4) Low Supply Current: 43µA Typ Adjustable Reset Time Adjustable Watchdog Time Open-Drain RST Output (LTC2901-1/LTC2901-3) Push-Pull RST Output (LTC2901-2/LTC2901-4) Individual Nondelayed Monitor Output for Each Supply Power Supply Glitch Immunity Guaranteed RST for VCC ≥ 1V 16-Lead Narrow SSOP Package

Programmable Quad Supply Monitor with Adjustable Reset and Watchdog Timers Features: Simultaneously Monitors Four Supplies 16 User Selectable Combinations of 5V, 3.3V, 3V, 2.5V, 1.8V, 1.5V and/or ±Adj Voltage Thresholds Guaranteed Threshold Accuracy: ±1.5% of Monitored Voltage Over Temperature Selectable Supply Tolerance: 5% and 10% Below Monitored Voltage (LTC2901-3/LTC2901-4) Low Supply Current: 43µA Typ Adjustable Reset Time Adjustable Watchdog Time Open-Drain RST Output (LTC2901-1/LTC2901-3) Push-Pull RST Output (LTC2901-2/LTC2901-4) Individual Nondelayed Monitor Output for Each Supply Power Supply Glitch Immunity Guaranteed RST for VCC ≥ 1V 16-Lead Narrow SSOP Package

Programmable Quad Supply Monitor with Adjustable Reset Timer and Supply Tolerance Features: Simultaneously Monitors Four Supplies 16 User Selectable Combinations of 5V, 3.3V, 3V, 2.5V, 1.8V, 1.5V and/or ±Adjustable Voltage Thresholds Guaranteed Threshold Accuracy: ±1.5% of Monitored Voltage Over Temperature Selectable Supply Tolerance: 5%, 7.5%, 10%, 12.5% Below Monitored Voltage Low Supply Current: 43µA Typ Adjustable Reset Time RESET Disable Pin for Margining Applications Open-Drain RST Output (LTC2902-1) Push-Pull RST Output (LTC2902-2) Individual Nondelayed Monitor Outputs for Each Supply Power Supply Glitch Immunity Guaranteed RESET for VCC ≥ 1V

Precision Quad Supply Monitor in 6-Lead SOT-23 Features: Ultralow Voltage Reset: VCC = 0.5V Guaranteed Monitor Four Inputs Simultaneously 3.3V, 2.5V, 1.8V, ADJ (LTC2903-A1) 5V, 3.3V, 2.5V, 1.8V (LTC2903-B1) 5V, 3.3V, 1.8V, –5.2V (LTC2903-C1) 3.3V, ADJ, ADJ, ADJ (LTC2903-D1) 5V, ADJ, ADJ, ADJ (LTC2903-E1) Guaranteed Threshold Accuracy: ±1.5% of Monitored Voltage over Temperature 10% (A1, B1, C1) and 5% (D1, E1) Undervoltage Monitoring Low Supply Current: 20µA Typical 200ms Reset Time Delay Active Low Open-Drain RST Output Power Supply Glitch Immunity Low Profile (1mm) SOT-23 (ThinSOT™) Package