General Description
The SY21282 high efficiency synchronous step-up
regulator operates using adaptive constant off-time
and current mode control, and supports a wide
input voltage range from 3V to 9V. It integrates
switches with low RDS(ON) to minimize conduction
loss.
The SY21282 features cycle-by-cycle peak current
limit, output short-circuit protection, and true
shutdown. It also provides enable control and
power-good indicator for system power sequencing.
The 1MHz pseudo-constant frequency reduces the
output voltage ripple and permits smaller external
capacitors and inductor.
The SY21282 is available in a compact QFN3×3-
16 package

Features
● 3V to 9V Input Voltage Range
● 6A (Min.) Main MOSFET Current Limit
● 7 µA Shutdown Current (Max.)
● 600 µA Quiescent Current (Typ.)
● Programmable Output Current Limit
● Low RDS(ON) for Internal N-Channel
MOSFET: 80mΩ Main, 40mΩ Rectifier,
40mΩ Disconnection
● Synchronous Rectification for High
Efficiency
● Pseudoconstant 1MHz Frequency
● Enable Control
● Input Voltage UVLO
● Output Overvoltage Protection
● Overtemperature Protection
● Output Short-Circuit Protection
● Power-Good Indicator
● True Shutdown Function
● RoHS-Compliant and Halogen-Free
● Compact QFN3mm×3mm-16 Package

Applications
● Power Bank
● High Power Application
● SSD