3A, 36V, 500kHz Synchronous Step-Down Converter

RT7272A

The RT7272A is a high efficiency, current mode synchronous step-down DC-DC converter that can deliver up to 3A output current over a wide input voltage range from 4.5V to 36V. The RT7272A integrates a 150mΩ On-Resistance of high-side MOSFET and an 80mΩ On-Resistance of low-side MOSFET to achieve high conversion efficiency up to 95%. The current mode control architecture supports fast transient response and simple compensation circuit.
A cycle-by-cycle current limit function provides protection against shorted output and an internal soft-start eliminates input current surge during start-up. The RT7272A provides complete protection functions such as input under-voltage lockout, output under-voltage protection, over-current protection and over-temperature protection.
The RT7272A is available in the thermal enhanced SOP-8 (Exposed Pad) package.

Applications

Distributed Power Systems
Pre-Regulator for Linear Regulators
Notebook Computers
Point of Load Regulator in Distributed Power System
Digital Set-Top Boxes
Personal Digital Recorders
Broadband Communications
Flat Panel TVs and Monitors
Vehicle Electronics

Key Spec.

	RT7272A
Status	Active
Vin (min) (V)	4.5
Vin (max) (V)	36
Number of Outputs	1
Vout (min) (V)	0.8
Vout (max) (V)	30
Output Adj. Method	Resistor
Iout (max) (A)	3
Current Limit (typ) (A)	5.5
Freq (typ) (kHz)	500
Ext Sync	No
Ron_HS (typ) (mOhm)	150
Ron_LS (typ) (mOhm)	80
Iq (typ) (mA)	0.9
Features	Adjustable Current Limit;Current Mode Control;Cycle-by-Cycle Current Limit;Enable Input;Force PWM;OCP;OTP;Stable with Ceramic Capacitor;UVP
Package Type	PSOP-8