SY21081B1ABC

High Efficiency, Fast Response, 2.0A, 18V Input Synchronous Step Down Regulator

SY21081B1ABC High Efficiency, Fast Response, 2.0A, 18V Input Synchronous Step Down Regulator Datasheet

Parameters
Features
Description

Part Number	SY21081B1ABC
Vin_min (V)	4.5
Vin_max (V)	18
Vo_min (V)	0.6
Io_max (A)	2
Vref Accuracy	±1.5%
Fsw (MHz)	1.4
Iq (uA)
Package	SOT23-6
Protection Mode	Hic-cup SCP
Features / Special Function

Low R_DS(ON) for Internal Switches (Top/Bottom): 130mΩ/105mΩ
4.5~18V Input Voltage Range
2A Output Current Capability
1.4MHz Switching Frequency Minimize the External Components
Stable with 10µF C_OUT and 1.0µH Inductor
Instant PWM Architecture to Achieve Fast Transient Responses
Internal Soft-start Limits the Inrush Current
Forced PWM Operation
Cycle-by-cycle Peak/Valley Current Limitation
Hic-cup Mode Output Short Circuit Protection
Thermal Shutdown with Auto Recovery
Compact Package SOT23-6

The SY21081B1 is a high efficiency, synchronous step-down DC/DC converter capable of delivering 2A load current. The SY21081B1 operates over a wide input voltage range from 4.5V to 18V and integrates main switch and synchronous switch with very low R_DS(ON) to minimize the conduction loss.

The SY21081B1 adopts the instant PWM architecture to achieve fast transient responses for high step down applications. In addition, it operates at pseudo-constant frequency of 1.4MHz to minimize the size of inductor and capacitor.