Synchronous Regulator Controller for N- or P-Channel MOSFETs Features: Ultrahigh Efficiency: Over 95% Possible Drives N-Channel MOSFET for High Current or P-Channel MOSFET for Low Dropout Pin Selectable Burst Mode Operation 1% Output Accuracy (LTC1266A) Pin Selectable Phase of Topside Driver for Boost or Step-Down Operation Wide VIN Range: 3.5V to 20V On-Chip Low-Battery Detector High Efficiency Maintained Over Large Current Range Low 170µA Standby Current at Light Loads Current Mode Operation for Excellent Line and Load Transient Response Logic Controlled Micropower Shutdown: IQ < 40µA Short-Circuit Protection Synchronous Switching with Nonoverlaping Gate Drives Available in 16-Pin Narrow SO Package

Micropower Temperature, Power Supply and Differential Voltage Monitor Features: Complete Ambient Temperature Sensor Onboard System Power Supply Monitor 10-Bit Resolution Rail-to-Rail Common-Mode Differential Voltage Input Available in 8-Pin SO and PDIP 0.2µA Supply Current When Idle 700µA Supply Current When Sampling at Maximum Rate Single Supply Voltage: 4.5V to 6V 3-Wire Half-Duplex Serial I/O Communicates with Most MPU Serial Ports and All MPU Parallel I/O Ports

Micropower Temperature, Power Supply and Differential Voltage Monitor Features: Complete Ambient Temperature Sensor Onboard System Power Supply Monitor 10-Bit Resolution Rail-to-Rail Common-Mode Differential Voltage Input Available in 8-Pin SO and PDIP 0.2µA Supply Current When Idle 700µA Supply Current When Sampling at Maximum Rate Single Supply Voltage: 4.5V to 6V 3-Wire Half-Duplex Serial I/O Communicates with Most MPU Serial Ports and All MPU Parallel I/O Ports

Micropower Temperature, Power Supply and Differential Voltage Monitor Features: Complete Ambient Temperature Sensor Onboard System Power Supply Monitor 10-Bit Resolution Rail-to-Rail Common-Mode Differential Voltage Input Available in 8-Pin SO and PDIP 0.2µA Supply Current When Idle 700µA Supply Current When Sampling at Maximum Rate Single Supply Voltage: 4.5V to 6V 3-Wire Half-Duplex Serial I/O Communicates with Most MPU Serial Ports and All MPU Parallel I/O Ports

Micropower Precision Triple Supply Monitor Features: Simultaneously Monitors Three Supplies LTC1326: 5V, 3.3V and ADJ LTC1326-2.5: 2.5V, 3.3V and ADJ Guaranteed Threshold Accuracy: ±0.75% Low Supply Current: 20µA Internal Reset Time Delay: 200ms Manual Push-Button Reset Input Active Low and Active High Reset Outputs Active Low “Soft” Reset Output Power Supply Glitch Immunity Guaranteed RESET for VCC3 ≥ 1V or VCC5 ≥ 1V or VCC25 ≥ 1V 8-Pin SO and MSOP Packages

Micropower Precision Triple Supply Monitor Features: Simultaneously Monitors Three Supplies LTC1326: 5V, 3.3V and ADJ LTC1326-2.5: 2.5V, 3.3V and ADJ Guaranteed Threshold Accuracy: ±0.75% Low Supply Current: 20µA Internal Reset Time Delay: 200ms Manual Push-Button Reset Input Active Low and Active High Reset Outputs Active Low “Soft” Reset Output Power Supply Glitch Immunity Guaranteed RESET for VCC3 ≥ 1V or VCC5 ≥ 1V or VCC25 ≥ 1V 8-Pin SO and MSOP Packages

Micropower Precision Triple Supply Monitor Features: Simultaneously Monitors Three Supplies LTC1326: 5V, 3.3V and ADJ LTC1326-2.5: 2.5V, 3.3V and ADJ Guaranteed Threshold Accuracy: ±0.75% Low Supply Current: 20µA Internal Reset Time Delay: 200ms Manual Push-Button Reset Input Active Low and Active High Reset Outputs Active Low “Soft” Reset Output Power Supply Glitch Immunity Guaranteed RESET for VCC3 ≥ 1V or VCC5 ≥ 1V or VCC25 ≥ 1V 8-Pin SO and MSOP Packages

Micropower, Regulated Charge Pump DC/DC Converters Features: 5V Output Current: 100mA (VIN ≥ 3V) 3.3V Output Current: 80mA (VIN ≥ 2.5V) Ultralow Power: 20µA Quiescent Current Regulated Output Voltage: 3.3V ±4%, 5V ±4%, ADJ VIN Range: 2V to 5.5V 800kHz Switching Frequency No Inductors Very Low Shutdown Current: <2µA Shutdown Disconnects Load from VIN PowerGood/Undervoltage Output Adjustable Soft-Start Time Short-Circuit/Thermal Protection Available in 8-Pin MSOP

Micropower, Regulated Charge Pump DC/DC Converters Features: 5V Output Current: 100mA (VIN ≥ 3V) 3.3V Output Current: 80mA (VIN ≥ 2.5V) Ultralow Power: 20µA Quiescent Current Regulated Output Voltage: 3.3V ±4%, 5V ±4%, ADJ VIN Range: 2V to 5.5V 800kHz Switching Frequency No Inductors Very Low Shutdown Current: <2µA Shutdown Disconnects Load from VIN PowerGood/Undervoltage Output Adjustable Soft-Start Time Short-Circuit/Thermal Protection Available in 8-Pin MSOP

5-Bit Programmable Synchronous Switching Regulator Controller for Pentium III Processor Features: 5-Bit Digitally Programmable 1.3V to 3.5V Fixed Output Voltage, VRM 8.4 Compliant Fast Transient Response: 0% to 100% Duty Cycle Phase Lead Compensation for Remote Sensing Overtemperature Protection Flags for Power Good and Overvoltage Fault 19A Output Current Capability from a 5V Supply Dual N-Channel MOSFET Synchronous Driver Initial Output Accuracy: ±1.5% Excellent Output Accuracy: ±2% Typ Over Line, Load and Temperature Variations High Efficiency: Over 95% Possible Adjustable Current Limit Without External Sense Resistors Available in 2O-Lead SSOP and SW Packages