5A, 24V, 570kHz Step-Down Converter

RT8251

The RT8251 is a monolithic step-down switch mode converter with a built-in internal power MOSFET. It achieves 5A continuous output current over a wide input supply range with excellent load and line regulation. Current mode operation provides fast transient response and eases loop stabilization.
The RT8251 provides protection functions such as cycle-by-cycle current limiting and thermal shutdown. In shutdown mode, the regulator draws 25μA of supply current. Programmable soft-start minimizes the inrush supply current and the output overshoot at initial startup. The RT8251 requires a minimum number of external components. The RT8251 is available in WQFN-16L 3x3 and SOP-8 (Exposed Pad) packages.

Applications

Distributed Power Systems
Battery Charger
DSL Modems
Pre-regulator for Linear Regulators

Key Spec.

	RT8251
Status	NRND
Vin (min) (V)	4.75
Vin (max) (V)	24
Number of Outputs	1
Vout (min) (V)	0.8
Vout (max) (V)	15
Output Adj. Method	Resistor
Iout (max) (A)	5
Current Limit (typ) (A)	6.8
Freq (typ) (kHz)	570
Ext Sync	No
Ron_HS (typ) (mOhm)	70
Ron_LS (typ) (mOhm)	15
Iq (typ) (mA)	0.8
Features	Adjustable Soft-Start;Current Mode Control;Cycle-by-Cycle Current Limit;Enable Input;Force PWM;OCP;OTP;Stable with Ceramic Capacitor;UVP
Package Type	PSOP-8;WQFN3x3-16