5V to 12V Single Synchronous Buck PWM Controller with Reference Input

RT8109

The RT8109 is a single-phase synchronous buck PWM DC-DC controller designed to drive two N-MOSFETs. It provides a highly accurate, programmable output voltage precisely regulated to low voltage requirement with an internal 0.6V ±1% reference.
The RT8109 uses a single feedback loop voltage mode PWM control for fast transient response. The high driving capability makes it suitable for large output current applications. An oscillator with fixed frequency 300kHz reduces the component size of the external inductor and capacitor for saving PCB board area and cost.
The RT8109 supports both tracking and stand-alone loop control modes. Standalone mode is simple and tracking mode provides better flexibility. The RT8109 also integrates complete protection functions such as OCP, OVP, UVP into WDFN-10L 3x3 package.

Applications

Mother Boards and Desktop Servers
Graphic Cards
Switching Power Supply
Generic DC/DC Power Regulator

Key Spec.

	RT8109
Status	NRND
Vs (typ) (V)	12
Vin (min) (V)	3.3
Vin (max) (V)	12
Vout (min) (V)	0.6
Vout (max) (V)	5
Output Adj. Method	Resistor
Accuracy (+/- %)	1
Freq (typ) (kHz)	300
Freq (min) (kHz)	250
Freq (max) (kHz)	350
Iq (typ) (mA)	2.5
Ext Sync	No
Features	Built-in Bootstrap Switch;Force PWM;OCP;OVP;Power Good;SCP;UVP;Voltage Mode Control
Package Type	WDFN3x3-10

Features

Single IC Supply Voltage ( 5V to 12V).
Drive Two N-MOSFETs
Fixed Operating Frequency at 300kHz
Voltage Mode PWM Control with External Feedback Loop Compensation
Over Current Protection by Sensing MOSFET R_DS(ON)
Dual Mode Regulation Control
♦ Standalone Mode (FB regulating to close to internal reference 0.6V)
♦ Tracking Mode (FB following PI input)
Power Good Indication
On/Off Control
Full 0 to 90% Duty Cycle
RoHS Compliant and Halgen Free

Datasheet

DS8109-03.pdf

Datasheet

DS8109-03.pdf