High Power Step-Down Switching Regulator Controller Features: High Power 5V to 1.xV-3.xV Switching Controller: Can Exceed 10A Output Maximum Duty Cycle > 90% Permits 3.3V to 2.xV Conversion Using a Low Power 5V Supply All N-Channel External MOSFETs Fixed Frequency Operation—Small L Excellent Output Regulation: ±1% Over Line, Load and Temperature Variations High Efficiency: Over 95% Possible No Low Value Sense Resistor Needed Outputs Can Drive External FETs with Up to 10,000pF Gate Capacitance Quiescent Current: 350µA Typ, 1µA in Shutdown Fast Transient Response Adjustable or Fixed 3.3V Output Available in 8-Lead SO and 16-Lead GN and SO Packages

450mA, Low Noise Current Mode Step-Down DC/DC Converter Features: High Efficiency: Up to 93% Constant Frequency Adaptive Power™ Operation Input Voltage Range: 3V to 13.5V Internal 0.6 Power Switch (VIN = 10V) Low Dropout Operation: 100% Duty Cycle Low-Battery Detector Internal Power-On Reset Timer Current Mode Operation for Excellent Line and Load Transient Response Low Quiescent Current: 470µA Shutdown Mode Draws Only 15µA Supply Current ±1% Reference Accuracy Available in 16- and 20-Lead Narrow SSOP

High Efficiency Low Noise Synchronous Step-Down Switching Regulator Features: Dual N-Channel MOSFET Synchronous Drive Programmable Fixed Frequency Wide VIN Range: 3.5V to 36V Operation Low Minimum On-Time (≤300ns) for High Frequency, Low Duty Cycle Applications Very Low Dropout Operation: 99% Duty Cycle Low Standby Current Secondary Feedback Control Programmable Soft Start Remote Output Voltage Sense Logic Controlled Micropower Shutdown: IQ <25µA Foldback Current Limiting (Optional) Current Mode Operation for Excellent Line and Load Transient Response Output Voltages from 1.19V to 9V Available in 16-Lead Narrow SO and SSOP Packages

High Efficiency Low Noise Synchronous Step-Down Switching Regulator Features: Dual N-Channel MOSFET Synchronous Drive Programmable Fixed Frequency Wide VIN Range: 3.5V to 36V Operation Ultrahigh Efficiency Very Low Dropout Operation: 99% Duty Cycle Low Standby Current Secondary Feedback Control Programmable Soft Start Remote Output Voltage Sense Logic Controlled Micropower Shutdown: IQ <25µA Foldback Current Limiting (Optional) Current Mode Operation for Excellent Line and Load Transient Response Output Voltages from 1.19V to 9V Available in 16-Lead Narrow SO and SSOP Packages

High Efficiency Low Noise Synchronous Step-Down Switching Regulator Features: Dual N-Channel MOSFET Synchronous Drive Programmable Fixed Frequency Wide VIN Range: 3.5V to 36V Operation Ultrahigh Efficiency Very Low Dropout Operation: 99% Duty Cycle Low Standby Current Secondary Feedback Control Programmable Soft Start Remote Output Voltage Sense Logic Controlled Micropower Shutdown: IQ <25µA Foldback Current Limiting (Optional) Current Mode Operation for Excellent Line and Load Transient Response Output Voltages from 1.19V to 9V Available in 16-Lead Narrow SO and SSOP Packages

High Efficiency Low Noise Synchronous Step-Down Switching Regulators Features: Maintains Constant Frequency at Low Output Currents Programmable Fixed Frequency (PLL Lockable) Wide VIN Range: 3.5V to 36V Operation Low Minimum On-Time (≤300ns) for High Frequency, Low Duty Cycle Applications Dual N-Channel MOSFET Synchronous Drive Very Low Dropout Operation: 99% Duty Cycle Low Dropout, 0.5A Linear Regulator for CPU I/O or Low Noise Audio Supplies Built-In Power-On Reset Timer Programmable Soft Start Low-Battery Detector Remote Output Voltage Sense Foldback Current Limiting (Optional) Pin Selectable Output Voltage Logic Controlled Micropower Shutdown: IQ < 25µA Output Voltages from 1.19V to 9V Available in 24-Lead Narrow SSOP and 28-Lead SSOP Packages

Switching Voltage Regulators 150V Low Iq Synchronous Step-Down Controller

High Efficiency Low Noise Synchronous Step-Down Switching Regulators Features: Maintains Constant Frequency at Low Output Currents Programmable Fixed Frequency (PLL Lockable) Wide VIN Range: 3.5V to 36V Operation Low Minimum On-Time (≤300ns) for High Frequency, Low Duty Cycle Applications Dual N-Channel MOSFET Synchronous Drive Very Low Dropout Operation: 99% Duty Cycle Low Dropout, 0.5A Linear Regulator for CPU I/O or Low Noise Audio Supplies Built-In Power-On Reset Timer Programmable Soft Start Low-Battery Detector Remote Output Voltage Sense Foldback Current Limiting (Optional) Pin Selectable Output Voltage Logic Controlled Micropower Shutdown: IQ < 25µA Output Voltages from 1.19V to 9V Available in 24-Lead Narrow SSOP and 28-Lead SSOP Packages

Dual High Efficiency, Low Noise, Synchronous Step-Down Switching Regulators Features: Maintains Constant Frequency at Low Output Currents Dual N-Channel MOSFET Synchronous Drive Programmable Fixed Frequency (PLL Lockable) Wide VIN Range: 3.5V to 36V Operation Ultrahigh Efficiency Very Low Dropout Operation: 99% Duty Cycle Low Dropout, 0.5A Linear Regulator for VPP Generation or Low Noise Audio Supply Built-In Power-On Reset Timer Programmable Soft Start Low-Battery Detector Remote Output Voltage Sense Foldback Current Limiting (Optional) Pin Selectable Output Voltage Logic-Controlled Micropower Shutdown: IQ < 30µA Output Voltages from 1.19V to 9V Available in 28- and 36-Lead SSOP Packages

Dual High Efficiency, Low Noise, Synchronous Step-Down Switching Regulators Features: Maintains Constant Frequency at Low Output Currents Dual N-Channel MOSFET Synchronous Drive Programmable Fixed Frequency (PLL Lockable) Wide VIN Range: 3.5V to 36V Operation Ultrahigh Efficiency Very Low Dropout Operation: 99% Duty Cycle Low Dropout, 0.5A Linear Regulator for VPP Generation or Low Noise Audio Supply Built-In Power-On Reset Timer Programmable Soft Start Low-Battery Detector Remote Output Voltage Sense Foldback Current Limiting (Optional) Pin Selectable Output Voltage Logic-Controlled Micropower Shutdown: IQ < 30µA Output Voltages from 1.19V to 9V Available in 28- and 36-Lead SSOP Packages