3A, Fast Transient Response, Low Noise, LDO Regulators Features: Optimized for Fast Transient Response Output Current: 3A Dropout Voltage: 340mV at 3A Low Noise: 40µVRMS (10Hz to 100kHz) 1mA Quiescent Current Wide Input Voltage Range: 2.7V to 20V No Protection Diodes Needed Controlled Quiescent Current in Dropout Fixed Output Voltages: 1.5V, 1.8V, 2.5V, 3.3V Adjustable Output from 1.21V to 20V <1µA Quiescent Current in Shutdown Stable with 10µF Output Capacitor Reverse Battery Protection No Reverse Current Thermal Limiting

3A, Fast Transient Response, Low Noise, LDO Regulators Features: Optimized for Fast Transient Response Output Current: 3A Dropout Voltage: 340mV at 3A Low Noise: 40µVRMS (10Hz to 100kHz) 1mA Quiescent Current Wide Input Voltage Range: 2.7V to 20V No Protection Diodes Needed Controlled Quiescent Current in Dropout Fixed Output Voltages: 1.5V, 1.8V, 2.5V, 3.3V Adjustable Output from 1.21V to 20V <1µA Quiescent Current in Shutdown Stable with 10µF Output Capacitor Reverse Battery Protection No Reverse Current Thermal Limiting

500mA, Low Noise, LDO Micropower Regulators Features: Low Noise: 20μVRMS (10Hz to 100kHz) Output Current: 500mA Low Quiescent Current: 30μA Wide Input Voltage Range: 1.8V to 20V Low Dropout Voltage: 300mV Very Low Shutdown Current: < 1μA No Protection Diodes Needed Fixed Output Voltages: 1.5V, 1.8V, 2.5V, 3V, 3.3V, 5V Adjustable Output from 1.22V to 20V Stable with 3.3μF Output Capacitor Stable with Aluminum, Tantalum or Ceramic Capacitors Reverse Battery Protection No Reverse Current Overcurrent and Overtemperature Protected 8-Lead SO and 12-Lead (4mm × 3mm) DFN 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

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-Channel Hot Swap Controller/Power Sequencer Features: Allows Safe Board Insertion and Removal from a Live Backplane Programmable Power Supply Sequencing Programmable Electronic Circuit Breaker User-Programmable Supply Voltage Power-Up and Power-Down Rate High Side Drivers for External N-Channel FETs Controls Supply Voltages from 1.2V to 12V Ensures Proper Power-Up Behavior Undervoltage Lockout Glitch Filter Protects Against Spurious RESET Signals 8- and 14-Pin SO Packages

Dual-Channel Hot Swap Controller/Power Sequencer Features: Allows Safe Board Insertion and Removal from a Live Backplane Programmable Power Supply Sequencing Programmable Electronic Circuit Breaker User-Programmable Supply Voltage Power-Up and Power-Down Rate High Side Drivers for External N-Channel FETs Controls Supply Voltages from 1.2V to 12V Ensures Proper Power-Up Behavior Undervoltage Lockout Glitch Filter Protects Against Spurious RESET Signals 8- and 14-Pin SO Packages