SY21113B1ADC

High Efficiency, 3.0A, 18V Input Synchronous Step Down Regulator

SY21113B1ADC High Efficiency, 3.0A, 18V Input Synchronous Step Down Regulator Datasheet

Parameters
Features
Description

Part Number	SY21113B1ADC
Vin_min (V)	4.5
Vin_max (V)	18
Vo_min (V)	0.6
Io_max (A)	3
Vref Accuracy	±1.5%
Fsw (MHz)	1.4
Iq (uA)
Package	TSOT23-6
Protection Mode	Hic-cup SCP
Features / Special Function	Auto-Discharge

Low R_DS(ON) for Internal Switches (Top/Bottom): 80mΩ/40mΩ
4.5~18V Input Voltage Range
3A Output Current Capability
1.4MHz Switching Frequency Minimize the External Components
Stable with 10µF C_OUT and 0.68µH 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
Output Auto Discharge Function
Compact Package: TSOT23-6

The SY21113B1 is a high efficiency, 1.4MHz synchronous step-down DC/DC regulator capable of delivering up to 3A load current. It can operate over a wide input voltage range from 4.5V to 18V and integrate main switch and synchronous switch with very low R_DS(ON) to minimize the conduction loss.

The SY21113B1 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 the inductor and the capacitor.