Step-Up/Step-Down Switched Capacitor DC/DC Converters with Low-Battery Comparator Features: 3.3V or 5V Output Voltages 2V to 10V Input Voltage Range Up to 50mA Output Current Only Three External Capacitors Required Soft Start Limits Inrush Current at Turn-On Low Operating Current: 60µA Low Shutdown Current: 10µA Shutdown Disconnects Load from VIN Short-Circuit and Overtemperature Protected 650kHz Switching Frequency Low-Battery Comparator Active in Shutdown Available in SO-8 Package

Step-Up/Step-Down Switched Capacitor DC/DC Converters with Low-Battery Comparator Features: 3.3V or 5V Output Voltages 2V to 10V Input Voltage Range Up to 50mA Output Current Only Three External Capacitors Required Soft Start Limits Inrush Current at Turn-On Low Operating Current: 60µA Low Shutdown Current: 10µA Shutdown Disconnects Load from VIN Short-Circuit and Overtemperature Protected 650kHz Switching Frequency Low-Battery Comparator Active in Shutdown Available in SO-8 Package

Low Noise, Switched Capacitor Regulated Voltage Inverters Features: Regulated Negative Voltage from a Single Positive Supply Low Output Ripple: Less Than 1mVP-P Typ High Charge Pump Frequency: 900kHz Typ Small Charge Pump Capacitors: 0.1µF Requires Only Four External Capacitors Fixed ±4.1V, ±2.5V, ±2V or Adjustable Output Shutdown Mode Drops Supply Current to <1µA High Output Current: Up to 20mA (Depending on VCC to VOUT Range) Output Regulation: 2.5% Over Line, Load and Temperature Available in 8-Lead MSOP, 8-Lead Narrow SO and 16-Lead Narrow SSOP

Low Noise, Switched Capacitor Regulated Voltage Inverters Features: Regulated Negative Voltage from a Single Positive Supply Low Output Ripple: Less Than 1mVP-P Typ High Charge Pump Frequency: 900kHz Typ Small Charge Pump Capacitors: 0.1µF Requires Only Four External Capacitors Fixed ±4.1V, ±2.5V, ±2V or Adjustable Output Shutdown Mode Drops Supply Current to <1µA High Output Current: Up to 20mA (Depending on VCC to VOUT Range) Output Regulation: 2.5% Over Line, Load and Temperature Available in 8-Lead MSOP, 8-Lead Narrow SO and 16-Lead Narrow SSOP

High Power Synchronous Switching Regulator Controller Features: High Power Buck Converter from 5V or 3.3V Input Adjustable Current Limit in S0-8 with Topside FET RDS(ON) Sensing No External Sense Resistor Required Hiccup Mode Current Limit Protection Adjustable, Fixed 1.9V, 2.5V, 2.8V and 3.3V Output All N-Channel MOSFET Synchronous Driver Excellent Output Regulation: ±2% over Line, Load and Temperature Variations High Efficiency: Over 95% Possible Fast Transient Response Fixed 300kHz Frequency Operation Internal Soft-Start Circuit Quiescent Current: 1mA; 45µA in Shutdown

Low Noise, Switched Capacitor-Regulated Voltage Inverters Features: Regulated Negative Voltage from a Single Positive Supply Low Output Ripple: Less Than 1mVP-P Typ High Charge Pump Frequency: 900kHz Typ Small Charge Pump Capacitors: 0.1µF Requires Only Four External Capacitors Fixed −4.1V or Adjustable Output Shutdown Mode Drops Supply Current to < 1µA High Output Current: Up to 10mA, VCC = 5V Output Regulation: 5% Available in SO-8 and 16-Lead SSOP

Low Noise, Switched Capacitor Regulated Voltage Inverters Features: Regulated Negative Voltage from a Single Positive Supply Low Output Ripple: Less Than 1mVP-P Typ High Charge Pump Frequency: 900kHz Typ Small Charge Pump Capacitors: 0.1µF Requires Only Four External Capacitors Fixed ±4.1V, ±2.5V, ±2V or Adjustable Output Shutdown Mode Drops Supply Current to <1µA High Output Current: Up to 20mA (Depending on VCC to VOUT Range) Output Regulation: 2.5% Over Line, Load and Temperature Available in 8-Lead MSOP, 8-Lead Narrow SO and 16-Lead Narrow SSOP

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