Single-Ended 8-Channel/Differential 4-Channel Analog Multiplexer with SMBus Interface Features: Micropower Operation: Supply Current = 20µA Max 2-Wire SMBus Interface Single 2.7V to ±5V Supply Operation Expandable to 32 Single or 16 Differential Channels Guaranteed Break-Before-Make Low RON: 35Ω Single Ended/70Ω Differential Low Charge Injection: 20pC Max Low Leakage: ±5nA Max Available in 16-Lead SO and GN Packages

PolyPhase, High Efficiency, Synchronous Step-Down Switching Regulator Features: Dual Controller Operates from One to Twelve Phases Reduces Required Input Capacitance and Power Supply Induced Noise Current Mode Control Ensures Current Sharing Phase-Lockable Fixed Frequency: 150kHz to 300kHz 1.8MHz Effective Switching Frequency True Remote Sensing Differential Amplifier OPTI-LOOP™ Compensation Reduces COUT ±1% Output Voltage Accuracy Power Good Output Voltage Monitor (LTC1629-PG) Wide VIN Range: 4V to 36V Operation Very Low Dropout Operation: 99% Duty Cycle Adjustable Soft-Start Current Ramping Internal Current Foldback Plus Shutdown Timer Overvoltage Soft-Latch Eliminates Nuisance Trips Micropower Shutdown Available in 28-Lead SSOP Package

PolyPhase, Synchronous Step-Down Switching Regulator Features: Reduces Required Input Capacitance and Power Supply Induced Noise True Remote Sensing Differential Amplifier 0.6V, ±1% Voltage Reference Accuracy PolyPhase Controller Operates from Two to Twelve Phases Current Mode Control Ensures Current Sharing Phase-Lockable Fixed Frequency: 150kHz to 300kHz 1.8MHz Effective Switching Frequency Capability OPTI-LOOP® Compensation Reduces COUT Power Good Output Voltage Monitor Wide VIN Range: 4V to 36V Operation Very Low Dropout Operation: 99% Duty Cycle Adjustable Soft-Start Current Ramping Internal Current Foldback Plus Shutdown Timer Overvoltage Soft-Latch Eliminates Nuisance Trips Micropower Shutdown Available in 28-Lead SSOP Package

Hot Swap Controller Features: Adjustable Undervoltage and Overvoltage Protection Foldback Current Limit Adjustable Current Limit Time-Out VCC: 2.97V to 16.5V Normal Operation, Protected Against Surges to 33V Single Channel NFET Driver Latch Off or Automatic Retry on Current Fault Driver for SCR Crowbar on Overvoltage Adjustable Reset Timer Reference Output with Uncommitted Comparator 16-Pin SSOP Package

PCI-Bus Hot Swap Controller Features: Allows Safe Board Insertion and Removal from a Live PCI Slot Works on either a Motherboard (LTC1643AH) or CompactPCI™ Card (LTC1643AL/LTC1643AL-1) Controls –12V, 3.3V, 5V, 12V Supplies Programmable Foldback Current Limit with Circuit Breaker User-Programmable Supply Voltage Power-Up Rate High Side Drive for External N-Channels MOSFETs –12V and 12V On-Chip Switches Fault and Power-Good Outputs Available in a Narrow 16-Lead SSOP Package

Dual Hot Swap Controllers Features: Allows Safe Board Insertion and Removal from a Live Backplane Programmable Electronic Circuit Breaker FAULT Output Indication Programmable Supply Voltage Power-Up Rate High Side Drive for External MOSFET Switches Controls Supply Voltages from 2.7V to 16.5V Undervoltage Lockout

Low Glitch 16-Bit Voltage Output DAC Features: 16-Bit Monotonic Over Temperature Low Glitch Impulse: 2nV-s Low Noise: 30nV/rtHz Buffered Rail-to-Rail Voltage Output Low Power: 50mW from ±5V Supplies Unipolar or Bipolar Output (0V to VREF or ±VREF) 4-Quadrant Multiplying Capability Asynchronous Clear to User-Defined Voltage Power-On Reset Three-Wire SPI and MICROWIRE™ Compatible Serial Interface Schmitt Trigger On CLK Input Allows Direct Optocoupler Interface 16-Pin Narrow SO Package

16-Bit Rail-to-Rail Micropower DACs in SO-8 Package Features: 16-Bit Monotonicity Over Temperature Deglitched Rail-to-Rail Voltage Output SO-8 Package ICC(TYP): 600µA Internal Reference: 2.048V (LTC1655) 1.25V (LTC1655L) Maximum DNL Error: ±1LSB Settling Time: 20µS to ±1LSB 750kHz Max Update Rate Power-On Reset to Zero Volt 3-Wire Cascadable Serial Interface Low Cost Pin Compatible Upgrade for LTC1451 12-Bit DAC Family

16-Bit Rail-to-Rail Micropower DACs in SO-8 Package Features: 16-Bit Monotonicity Over Temperature Deglitched Rail-to-Rail Voltage Output SO-8 Package ICC(TYP): 600µA Internal Reference: 2.048V (LTC1655) 1.25V (LTC1655L) Maximum DNL Error: ±1LSB Settling Time: 20µS to ±1LSB 750kHz Max Update Rate Power-On Reset to Zero Volt 3-Wire Cascadable Serial Interface Low Cost Pin Compatible Upgrade for LTC1451 12-Bit DAC Family

Parallel 16-Bit Rail-to-Rail Micropower DAC Features: 16-Bit Monotonic Over Temperature Deglitched Rail-to-Rail Voltage Output: 8nV•s ICC: 650µA Typ Maximum DNL Error: ±1LSB Settling Time: 20µs to ±1LSB Built-In Reference: 2.048V (LTC1657) 1.25V (LTC1657L) Internal Power-On Reset to Zero Volts Asynchronous CLR Pin Output Buffer Configurable for Gain of 1 or 2 Parallel 16-Bit or 2-Byte Double Buffered Interface Narrow 28-Lead SSOP Package Multiplying Capability

Micropower Quad 10-Bit DAC Features: Tiny: 4 DACs in the Board Space of an SO-8 Micropower: 59µA per DAC Plus 1µA Sleep Mode for Extended Battery Life Wide 2.7V to 5.5V Supply Range Rail-to-Rail Voltage Outputs Drive 1000pF Reference Range Includes Supply for Ratiometric 0V to VCC Output Reference Input Impedance is Code-Independent —Eliminates External Reference Buffer Individually Addressable DACs Differential Nonlinearity: ≤ ±0.75LSB Max Pin-Compatible Octal Version Available (LTC1660)

Micropower Quad 10-Bit DAC Features: Tiny: 4 DACs in the Board Space of an SO-8 Micropower: 59µA per DAC Plus 1µA Sleep Mode for Extended Battery Life Wide 2.7V to 5.5V Supply Range Rail-to-Rail Voltage Outputs Drive 1000pF Reference Range Includes Supply for Ratiometric 0V to VCC Output Reference Input Impedance is Code-Independent —Eliminates External Reference Buffer Individually Addressable DACs Differential Nonlinearity: ≤ ±0.75LSB Max Pin-Compatible Octal Version Available (LTC1660)

Micropower Octal 8-Bit DACs Features: Tiny: 8 DACs in the Board Space of an SO-8 Micropower: 56µA per DAC Plus 1µA Sleep Mode for Extended Battery Life Pin Compatible 8-Bit LTC1665 and 10-Bit LTC1660 Wide 2.7V to 5.5V Supply Range Rail-to-Rail Voltage Outputs Drive 1000pF Reference Range Includes Supply for Ratiometric 0V-to-VCC Output Reference Input Impedance is Constant—Eliminates External Buffer

Doubler Charge Pumps with Low Noise Linear Regulator Features: Low Output Noise: 60µVRMS (100kHz BW) Adjustable or Fixed Boosted Output Adjustable Output Voltage Range: 2.5V to 5.5V Fixed Output Voltages: 3.3V, 5V Wide Input Voltage Range: 1.8V to 4.4V Uses Small Ceramic Capacitors No Inductors Required Output Current up to 50mA 550kHz Switching Frequency Low Operating Current: 150µA Low Shutdown Current: 1µA Internal Thermal Shutdown and Current Limiting Available in 8-Pin MSOP and SO Packages

100Mbps RS485 Hot Swapable Quad Drivers Features: Ultrahigh Speed: 100Mbps Guaranteed Propagation Delay: 8ns ±4ns Over Temperature Low Channel-to-Channel Skew: 500ps Typ Hot Swap™ Capable 50Mbps Operation with VDD = 3V Low tPLH/tPHL Skew: 500ps Typ Driver Outputs Maintain High Impedance in Three-State or with Power Off Short-Circuit Protected: 3mA Typ Output Current for an Indefinite Short Thermal Shutdown Protected Single 5V or 3V Supply Pin Compatible with LTC486/LTC487

100Mbps RS485 Hot Swapable Quad Drivers Features: Ultrahigh Speed: 100Mbps Guaranteed Propagation Delay: 8ns ±4ns Over Temperature Low Channel-to-Channel Skew: 500ps Typ Hot Swap™ Capable 50Mbps Operation with VDD = 3V Low tPLH/tPHL Skew: 500ps Typ Driver Outputs Maintain High Impedance in Three-State or with Power Off Short-Circuit Protected: 3mA Typ Output Current for an Indefinite Short Thermal Shutdown Protected Single 5V or 3V Supply Pin Compatible with LTC486/LTC487

Differential Driver and Receiver Pair with Fail-Safe Receiver Output Features: No Damage or Latchup to ±15kV ESD (Human Body Model), IEC1000-4-2 Level 4 (±8kV) Contact and Level 3 (±8kV) Air Discharge Guaranteed High Receiver Output State for Floating, Shorted or Terminated Inputs with No Signal Present Drives Low Cost Residential Telephone Wires ICC = 600µA Max with No Load Single 5V Supply –7V to 12V Common Mode Range Permits ±7V Ground Difference Between Devices on the Data Line Power-Up/Down Glitch-Free Driver Outputs Permit Live Insertion or Removal of Transceiver Driver Maintains High Impedance with the Power Off Up to 32 Transceivers on the Bus Pin Compatible with the SN75179 and LTC490 Available in SO, MSOP and PDIP Packages

Differential Driver and Receiver Pair with Fail-Safe Receiver Output Features: No Damage or Latchup to ±15kV ESD (Human Body Model), IEC1000-4-2 Level 4 (±8kV) Contact and Level 3 (±8kV) Air Discharge Guaranteed High Receiver Output State for Floating, Shorted or Terminated Inputs with No Signal Present Drives Low Cost Residential Telephone Wires ICC = 600µA Max with No Load Single 5V Supply –7V to 12V Common Mode Range Permits ±7V Ground Difference Between Devices on the Data Line Power-Up/Down Glitch-Free Driver Outputs Permit Live Insertion or Removal of Transceiver Driver Maintains High Impedance with the Power Off Up to 32 Transceivers on the Bus Pin Compatible with the SN75179 and LTC490 Available in SO, MSOP and PDIP Packages

SMBus/IC Fan Speed Controller in SOT-23 Features: Complete SMBus/I²C™ Brushless DC Fan Speed Control System in a 5-Pin SOT-23 package 0.75Ω PMOS Linear Regulator with 180mA Output Current Rating 0V to 4.922V Output Voltage Range Controlled by a 6-Bit DAC Simple 2-Wire SMBus/I²C Interface 250ms Internal Timer Ensures Fan Start-Up Current Limit and Thermal Shutdown Fault Status Indication via SMBus Host Readback

Isolated Secondary Synchronous Rectifier Controller Features: High Efficiency Over Wide Load Current Range ±0.8% Output Voltage Accuracy Dual N-Channel MOSFET Synchronous Drivers Pulse Transformer Synchronization Optocoupler Feedback Driver Programmable Current Limit Protection ±5% Margin Output Voltage Adjustment Adjustable Overvoltage Fault Protection Power Good Flag Auxiliary 3.3V Logic Supply Available in 16-Lead SSOP and SO Packages