A7406A
AiT Semiconductor Inc.
DC-DC CONVERTER BUCK (STEP-DOWN)
40V, 600mA ASYNCHRONOUS
www.ait-ic.com
DETAILED INFORMATION
The A7406A is a 1.8MHz, non-synchronous, step-down switching regulator with integrated internal high side
MOSFET. It provides internally compensated single 0.6A high efficient output. It features wide input voltage
range, internal soft-start control, and precision current limit. Low operational quiescent current feature is suit
for battery powered applications.
PWM Control
At heavy load or moderate load condition, the A7406A operates in a fixed frequency, peak current control
mode to regulate the output voltage. A PWM cycle is initiated by the internal clock. The power MOSFET is
turned on and remains on until its current reaches the value set by COMP voltage. When the power switch is
off, it remains off for at least 100ns before the next cycle starts. If, in one PWM period, the current in the power
MOSFET does not reach COMP set current value, the power MOSFET remains on, saving a turn-off
operation. At light load condition, the A7406A operates in pulse skipping mode to improve light load efficiency.
Internal Regulator
Most of the internal circuitry is powered on by the 2.6V internal regulator.
When VIN is higher than 4.0V, the output of the regulator is in full regulation.
When VIN is lower, the output degrades.
Under Voltage Lockout (UVLO)
VIN Under voltage lockout (UVLO) is implemented to protect the chip from operating at insufficient supply
voltage.
Thermal Shutdown
Thermal shutdown is implemented to prevent the chip from thermally running away. When the temperature is
higher than its upper threshold, the A7406A will shut down. When the temperature is lower than its lower
threshold, the chip is enabled again.
REV1.0
- MAR 2018 RELEASED -
- 7 -
AITSEMI [ AiT Semiconductor ]
