NCP1530
600 mA PWM/PFM Step−Down Converter with External Synchronization Pin
The NCP1530 is a PWM/PFM non−synchronous s...
NCP1530
600 mA PWM/PFM Step−Down Converter with External Synchronization Pin
The NCP1530 is a PWM/PFM non−synchronous step−down
(Buck) DC−DC converter for usage in systems supplied from 1−cell Li−ion, or 2 or more cells Alkaline/NiCd/NiMH batteries. It can
operate in Constant−Frequency PWM mode or PWM/PFM mode in
which the controller will automatically switch to PFM mode
operation at low output loads to maintain high efficiency. The
switching frequency can also be synchronized to external clock between 600 kHz and 1.2 MHz. The maximum output current is up
to 600 mA. Applying an external synchronizing signal to SYN pin
can supersede the PFM operation. The NCP1530 consumes only 47 mA (typ) of supply current
(VOUT = 3.0 V, no switching) and can be forced to shutdown mode by bringing the enable input (EN) low. In shutdown mode, the
regulator is disabled and the shutdown supply current is reduced to 0.5 mA (typ). Other features include built−in undervoltage lockout, internal thermal shutdown, an externally programmable soft−start
time and output current limit protection. The NCP1530 operates
from a maximum input voltage of 5.0 V and is available in a space saving, low profile Micro8™ package.
Features
Pb−Free Package is Available High Conversion Efficiency, up to 92% at VIN = 4.3 V,
VOUT = 3.3 V, IOUT = 300 mA
Current−Mode PWM Control Automatic PWM/PFM Mode for Current Saving at Low Output Loads Internal Switching
Transistor Support 600 mA Output Current
(VIN = 5.0 V, V...