Multiple Power Supply Tracking Controller with Power Good Timeout Features: Flexible Power Supply Tracking Up and Down Power Supply Sequencing Supply Stability Is Not Affected Controls Three Supplies Without Series FETs Controls an Optional Fourth Supply with a Series FET Electronic Circuit Breaker Remote Sense Switch Compensates for Voltage Drop Across a Series FET Supply Shutdown Outputs FAULT Output Adjustable Power Good Timeout Available in Narrow 24-Lead SSOP and Tiny 24-Lead QFN Packages

Ultra-Low Power Supervisor with Power-Fail Output, Selectable Thresholds Features: 500nA Quiescent Current ±1.5% (Max) Accuracy over Temperature Integrated Precision Attenuators Eight Pin-Selectable Reset Thresholds Eight Pin-Selectable Power-Fail Thresholds Early Warning Power-Fail Output 200ms Reset Timeout Manual Reset Input Compact 8-Lead, 2mm × 2mm DFN and TSOT-23 (ThinSOT™) Packages

Congurable 4-Supply Monitors with Watchdog Timer Features: Simultaneously Monitors Four (LTC2938) or Six Supplies (LTC2939) Sixteen User-Selectable Combinations of 5V, 3.3V, 2.5V, 1.8V, 1.5V, 1.2V and/or ± Adjustable Voltage Thresholds Guaranteed Threshold Accuracy: ±1.5% Adjustable Reset and Watchdog Timeout Low Supply Current: 80μA Typical Power Supply Glitch Immunity Guaranteed RST for VCC > 1V High Temperature Operation to 125°C 12-Pin 4mm × 3mm DFN or 12-Lead MSOP (LTC2938) and 16-Lead MSOP Package (LTC2939)

3A, 4MHz, Monolithic Synchronous Step-Down Regulator Features: High Efficiency: Up to 95% 3A Output Current Low Quiescent Current: 64μA Low RDS(ON) Internal Switch: 77mΩ 2.25V to 5.5V Input Voltage Range Programmable Frequency: 300kHz to 4MHz ±2% Output Voltage Accuracy 0.8V Reference Allows Low Output Voltage Selectable Forced Continuous/Burst Mode® Operation with Adjustable Burst Clamp Synchronizable Switching Frequency Low Dropout Operation: 100% Duty Cycle Power Good Output Voltage Monitor Overtemperature Protected Available in 16-Lead Exposed Pad TSSOP and QFN Packages

3A, 4MHz, Monolithic Synchronous Step-Down Regulator Features: High Efficiency: Up to 95% 3A Output Current Low Quiescent Current: 64μA Low RDS(ON) Internal Switch: 77mΩ 2.25V to 5.5V Input Voltage Range Programmable Frequency: 300kHz to 4MHz ±2% Output Voltage Accuracy 0.8V Reference Allows Low Output Voltage Selectable Forced Continuous/Burst Mode® Operation with Adjustable Burst Clamp Synchronizable Switching Frequency Low Dropout Operation: 100% Duty Cycle Power Good Output Voltage Monitor Overtemperature Protected Available in 16-Lead Exposed Pad TSSOP and QFN Packages

3A, 4MHz, Monolithic Synchronous Step-Down Regulator Features: High Efficiency: Up to 95% 3A Output Current Low Quiescent Current: 64μA Low RDS(ON) Internal Switch: 77mΩ 2.25V to 5.5V Input Voltage Range Programmable Frequency: 300kHz to 4MHz ±2% Output Voltage Accuracy 0.8V Reference Allows Low Output Voltage Selectable Forced Continuous/Burst Mode® Operation with Adjustable Burst Clamp Synchronizable Switching Frequency Low Dropout Operation: 100% Duty Cycle Power Good Output Voltage Monitor Overtemperature Protected Available in 16-Lead Exposed Pad TSSOP and QFN Packages

2.5A, 4MHz, Monolithic Synchronous Step-Down Regulator Features: High Efficiency: Up to 95% 2.5A Output Current Low Quiescent Current: 62µA Low RDS(ON) Internal Switches: 85mΩ Programmable Frequency: 300kHz to 4MHz No Schottky Diode Required ±2% Output Voltage Accuracy 0.8V Reference Allows Low Output Voltage Selectable Forced Continuous/Burst Mode Operation with Adjustable Burst Clamp Synchronizable Switching Frequency Low Dropout Operation: 100% Duty Cycle Power Good Output Voltage Monitor Overtemperature Protection Available in 16-Lead Thermally Enhanced TSSOP and QFN Packages

2.5A, 4MHz, Monolithic Synchronous Step-Down Regulator Features: High Efficiency: Up to 95% 2.5A Output Current Low Quiescent Current: 62µA Low RDS(ON) Internal Switches: 85mΩ Programmable Frequency: 300kHz to 4MHz No Schottky Diode Required ±2% Output Voltage Accuracy 0.8V Reference Allows Low Output Voltage Selectable Forced Continuous/Burst Mode Operation with Adjustable Burst Clamp Synchronizable Switching Frequency Low Dropout Operation: 100% Duty Cycle Power Good Output Voltage Monitor Overtemperature Protection Available in 16-Lead Thermally Enhanced TSSOP and QFN Packages

PolyPhase Synchronous Boost Controller with Input/Output Protection Features: Input Supply Range: 4.5V to 65V (Up to 75V Surge) Reverse Input Protection to –40V Inrush Current Control, Overcurrent Protection and Output Disconnect for Boost Converter Input Voltage Surge Protection with Adjustable Clamp Voltage Onboard Ideal Diode Controller Low Quiescent Current: 55µA 2-Phase Operation Reduces Required Input and Output Capacitance and Noise Output Voltage Up to 60V Adjustable Gate Drive Level 5V to 10V (OPTI-DRIVE) for Logic-Level or Standard Threshold FETs No External Bootstrap Diodes Required 5mm × 9mm QFN-44 Package with High Voltage Pin Spacing

60V Low IQ, Triple Output, Buck/Buck/Boost Synchronous Controller with PassThru Features:Dual Buck Plus Single Boost Synchronous ControllersWide Bias Input Voltage Range: 4.5V to 60VOutputs Remain in Regulation Through Cold Crank Down to a 2.2V Input Supply VoltageBuck and Boost Output Voltages Up to 60VAdjustable Gate Drive Level 5V to 10V (OPTI-DRIVE)No External Bootstrap Diodes RequiredLow Operating IQ: 29μA (One Channel On)100% Duty Cycle for Boost Synchronous MOSFETPhase-Lockable Frequency (75kHz to 850kHz)Programmable Fixed Frequency (50kHz to 900kHz)Very Low Dropout Operation: 99% Duty Cycle (Bucks)Low Shutdown IQ: 3.6μAFixed or Adjustable Boost Output Voltage Saves IQSmall 38-Lead 5mm × 7mm QFN and TSSOP Packages