RT9645 Datasheet | Richtek

Description The RT9645 is a bo regulator which is pliant to ACPI specification for desktop/server power management and system application. The part features one switching regulator for DDR memory VDDQ power; a second PWM controller for GMCH core power, a LDO controller for FSB_ VTT termination, a LDO controller for 5VSB to 3VSB .. conversion; and a dual power control 5VDL for S0 and S3 system power. The part is generally operated to conform to ACPI specification. In S3 mode, only VDDQ and 3.3VSB regulators remain on while the FSB_ VTT regulator is off. In the transition from S3 to S0, an internal SS capacitor is attached for linear regulators to control its slew rate respectively to avoid inrush current induced. RT9645 supports both Intel VR11 and AMD K8 platform. There is extra control pin VTT_EN to enable FSB_VTT regulator at AMD K8 mode. This part also implements PWM1 (VDDQ) enabled by release P1 at AMD K8 application. This part is assemblyed in the tiny VQFN-24L 4x4 package. Features z z z z z Integrated 5 Channels Power Regulator DC/DC Buck PWM Regulator (Driver Included) DC/DC Buck PWM Controller Linear Regulator Controller for FSB_VTT Power 3.3VSB Linear Regulator Controller with 40m A Output Capability 5VDL Switch Control Conform to ACPI Specification, Supporting Power Management at S0, S3, and S5 State 300k Hz Fixed Frequency Oscillator Low-Side RDS(ON) Current Sensing for Precision Over-Current Detection Thermal Shutdown Small 24-Lead VQFN Package Ro HS pliant and 100% Lead (Pb)-Free z z z z z z z Applications z z Desktop System Power Server System Power Pin Configurations Ordering Information SB5V_DRV (TOP VIEW) SB3V_SEN VCC_DRV Package Type QV : VQFN-24L 4x4 Operating Temperature Range P : Pb Free with mercial Standard G : Green (Halogen Free with mercial Standard) Note : Richtek Pb-free and Green products are : S3 S5 SB3V_DRV VDD PWM2 SS2/EN2 P2 FB2 19 18 17 16 1 2 3 4 5 6 7 8 9 10 11 25 12 VTT_DRV VTT_SEN...