16 15 14 13
No Pin Name
Pin to connect a current sense resister
Error amplifier output pin. Connect a phase compensation circuit between this pin and GND.
When voltage level of this pin is High, switchinf is turned off. When this pin turns Low, the capacitor connected between
SS/HICCUP and GND discharges voltage.
Bootstrap capacity connection pin. This pin becomes a GATE drive power supply of an external NchMOSFET. Connect a
bypath capacitor between CBOOT and SW.
An external the upper MOSFET gate drive pin.
Pin to connect with switching node. The source of NchMOSFET connects to this pin.
An external the lower MOSFET gate drive pin.
Power supply pin for an external the lower MOS-FET gate drive.
Ground pin. Each reference voltage is based on the voltage of the ground pin.
Power supply pin. This pin is monitored by UVLO function. When the voltage of this pin becomes 7.8V or more by UVLO
function, The IC starts and the soft start function operates.
Reference current pin for current detection. The sink current of about 20μA flows to this pin. When a resistance is
connected between this pin and VIN outside and the voltage applied to the SW pin is lower than the voltage of the terminal
side of the resistance, the upper NchMOSFET is off by operating the current limiter comparator. This operation is reset
with respect to each PWM pulse.
Pin to connect a capacitor for soft start. A capacitor for soft start is charged by using the voltage of about 5μA.This pin
ends the soft start period by using the voltage of about 1.1V and the frequency fold back function becomes active.
Output voltage correction rate pin.
Pin to connect a current sense resister. Overcurrent protector limit function operates when the voltage of the both ends of
external sense resistance exceed 46mV. When you do not use this function, make sure to connect the pin of the external
sense resistance to GND.
Error amplifier reverse input pin. By operating the converter, the voltage of this pin becomes 0.7V. The voltage in which
the output voltage is divided by an external resistance is applied to this pin. Also, the oscillation frequency becomes
one-tenth when the voltage of this pin becomes 0.4V or less after soft start function.