NCP1501

Features:

Synchronous Rectification for Higher Efficiency in PWM Mode
Linear Mode Operation for Low Noise Output at Low Loads
Integrated MOSFETs and Feedback Circuits
Cycle-by-Cycle Peak Current Limit of 800 mA (typ)
Automatic Switching Between PWM and Linear Mode
Operating Frequency Range of 500 to 1000 kHz
Optimized for Ceramic Capacitors and Low Profile Inductors
Thermal Limit Protection
Built-in Slope Compensation for Current Mode PWM Converter
Fixed Output Voltages of 1.05 V, 1.35 V, 1.57 V, 1.8 V
Shutdown Current Consumption of 0.2 A
Internal Soft Start
Transistor Count: 3500
Pb-Free Package is Available


Application

Cellular Phones
PDAs
Pagers
Supplies for DSP Cores
Portable Applications


Pinout




Specifications

Rating	Symbol	Value	Unit
Maximum Voltage All Pins	Vmax	5.5	V
Maximum operating Voltage All Pins	Vmax	5.2	V
Thermal Resistance, Junction-to-Air	RJA	240	/W
Operating Ambient Temperature Range	TA	-30 to +85
ESD Withstand VoltageHuman Body Model (Note 1)                                            Machine Model (Note 2)	VESD	> 2500 > 100	V
Moisture Sensitivity	MSL	Level 1
Storage Temperature Range	Tstg	-55to+150
Junction Operating Temperature Range	TJ	-30to+125

Description

The NCP1501 is a dual mode regulator that operates either as a PWM Buck Converter or as a Low Drop Out Linear Regulator. If a synchronization signal is present, the NCP1501 operates as a current mode PWM converter with synchronous rectification. The synchronization signal allows the user to control the location of the spurious frequency noise generated by a PWM converter. Linear mode is active when a synchronization signal is not present. The NCP1501 configuration allows an efficient high power operation and low noise during system sleep modes.