RT7258

8A, 24V, 600kHz Step-Down Converter with Synchronous Gate Driver

The RT7258 is a synchronous step-down DC/DC converter with an integrated high side internal power MOSFET and a gate driver for a low side external power MOSFET. It can deliver up to 8A output current from a 4.5V to 24V input supply. The RT7258's current mode architecture allows the transient response to be optimized over a wider input voltage and load range. Cycle-by-cycle current limit provides protection against shorted outputs and soft-start eliminates input current surge during start-up. The RT7258 is synchronizable to an external clock with frequency ranging from 300kHz to 1.5MHz.
The RT7258 is available in WDFN-14L 4x3 and SOP-8 (Exposed Pad) packages.

Applications

Point of Load Regulator in Distributed Power System
Digital Set top Boxes
Personal Digital Recorders
Broadband Communications
Flat Panel TVs and Monitors

Key Spec.
	RT7258
Status	Active
Vin (min) (V)	4.5
Vin (max) (V)	24
Number of Outputs	1
Vout (min) (V)	0.808
Vout (max) (V)	15
Output Adj. Method	Resistor
Iout (max) (A)	8
Current Limit (typ) (A)	13
Freq (typ) (kHz)	600
Freq (min) (kHz)	300
Freq (max) (kHz)	1500
Ext Sync	Yes
Ron_HS (typ) (mOhm)	45
Iq (typ) (mA)	0.9
Features	Built-in Bootstrap Switch;Current Mode Control;Cycle-by-Cycle Current Limit;Enable Input;External Synchronization;Force PWM;Internal Compensation;OCP;OTP;Power Good;Stable with Ceramic Capacitor;UVP
Package Type	PSOP-8;WDFN4x3-14

Features

4.5V to 24V Input Voltage Range
8A Output Current
45mΩ Internal High Side N-MOSFET
Current Mode Control
600kHz Switching Frequency
Adjustable Output from 0.808V to 15V
Up to 95% Efficiency
Internal Compensation
Stable with Ceramic Capacitors
Synchronous External Clock : 300kHz to 1.5MHz
Cycle-by-Cycle Current Limit
Input Under Voltage Lockout
Output Under Voltage Protection
Power Good Indicator
Thermal Shutdown Protection
RoHS Compliant and Halogen Free

Datasheet
Title	Last Update	Download
8A, 24V, 600kHz Step-Down Converter with Synchronous Gate Driver	2013/09/12

Technical Documents
Title	Item Type	Last Update	Download
Richtek Product Selection Guide [Jan., 2024]	Selection Guide	2024/01/18
Richtek Featured Product Tree [Aug., 2023]	Selection Guide	2023/08/07

Videos
Title	Last Update	Views
How to estimate control loop bandwidth from the transient response time?	2017/03/30	2209

Reference Design
Title	Last Update	Download
Richtek Load Transient Tool	2022/07/25

Part Number	Package Type	Package Qty.	Free Sample	Buy From Authorized Distributor
RT7258GQW	WDFN4x3-14	1500	Request	Buy from Distributor
RT7258GSP	PSOP-8	2500	Request	Buy from Distributor

Please confirm with our distributor or sales representative for actual stock status.