NCP1550
600 kHz PWM/PFM Step−Down DC−DC Controller
The NCP1550 is a monolithic micropower high frequency voltage mode s...
NCP1550
600 kHz PWM/PFM Step−Down DC−DC Controller
The NCP1550 is a monolithic micropower high frequency
voltage mode step−down controller IC, specially designed for battery operated hand−held electronic products. With appropriate external P−type
MOSFET, the device can provide up to 2.0 A loading current with high conversion efficiency. The device operates in Constant−Frequency PWM mode at normal operation, that ensures low output ripple noise, and which will automatically switch to PFM mode at low output loads for higher efficiency. Additionally, value−added features of Chip Enable to reduce IC Off−State current and integrated feedback resistor network, make it the best choice for portable applications. The device is designed to operate for
voltage regulation with minimum external components and board space. This device is available in a TSOP−5 package with six standard output
voltage options.
Features
High Efficiency 92%, Typical Low Quiescent Bias Current of 50 mA
(Typical at PFM Mode with No Load)
Output
Voltage Options from 1.8 V to 3.3 V
with High Accuracy $2.0%
Low Output
Voltage Ripple, 50 mV, Typical PWM Switching Frequency at 600 kHz Automatic PWM/PFM Switchover at Light Load Condition Very Low Dropout Operation, 100% Max. Duty Cycle Chip Enable Pin with On−Chip 150 nA Pullup Current Source Low Shutdown Current, 0.3 mA, Typical Input
Voltage Range from 2.45 V to 5.5 V Built−in Soft−Start Internal Under
voltage Lockout (UVLO) Protection Low ...