SQ28903BAT

High-Efficiency, 6V, 3A 2.2MHz Synchronous Step-Down Regulator

SQ28903BAT High-Efficiency, 6V, 3A 2.2MHz Synchronous Step-Down Regulator Datasheet

Parameters
Features
Description

Part Number	SQ28903BAT
Vin_min (V)	2.8
Vin_max (V)	6
Io_max (A)	3
Channels	1
Vo_min (V)	0.6
Fsw (MHz)	2.2
Vref (V)	0.6
Vref Accuracy	±1%
Iq (uA)	38
Rdson1	65
Rdson2	25
Soft Start	0.5ms
Package	SOT583
Topology	Sync. Buck
Protection Mode	Hiccup SCP
Features / Special Function	PWM and PFM Operating Selectable
Temp Range	-40°C ~125°C

• 2.8V~6V Input Voltage Range

• Up to 3A Output Current Capability

• Low RDS(ON) for Internal Switches (Top/Bottom): 65mΩ/25mΩ

• Constant Frequency Peak Current Mode Control

• 38µA Quiescent Current (Typ.)

• 2.5µA Shutdown Current (Typ.)

• ±1% 0.6V Reference Over -40°C to +125°C

• 2.2MHz Switching Frequency

• Internal Soft-Start Limits Inrush Current

• Forced PWM or PFM Operation Selectable in Light Load

• 100% Duty Cycle Dropout Operation

• Spread Spectrum Clocking

• Power-Good Indicator

• Hiccup Mode for Short-Circuit Protection

• Compact SOT583 Package

• MSL Rating: MSL1

The SQ28903 is a high-efficiency 2.2MHz synchronous step-down converter that operates over an input voltage range of 2.8V to 6V, and can deliver an output current of up to 3A. It integrates very low RDS(ON) main and synchronous MOSFETs to minimize conduction loss. The 2.2MHz constant switching frequency reduces the required external inductor and capacitor values.

The SQ28903 utilizes a constant frequency peak current mode control architecture to achieve stable operation across a wide range of conditions. It also provides cycle-by-cycle current limit protection, output short-circuit protection, and overtemperature protection.

The SQ28903 is available in a space-saving, SOT583 package.