RT9641C

Pinout




Description

The RT9641C, paired with either the RT9230 or RT9231 simplifies the implementation of ACPI-compliant designs in microprocessor and computer applications. The IC integrates two linear controllers and a low-current pass transistor, as well as the monitoring and control functions into a 16-pin SOIC package. One linear controller generates the 3.3V_DUAL voltage plane from an ATX power supply's 5VSB output during sleep states (S3,S4/S5), powering the PCI slots through an external pass transistor, as instructed by the status of the 3.3V_DUAL enable pin. An additional pass transistor is used to switch in the ATX 3.3V output for PCI operation during S0 and S1 (active) operating states. The second linear controller supplies the computer system's 2.5V/3.3V memory power through an external pass transistor in active states. During S3 state, an integrated pass transistor supplies the 2.5V/3.3V sleep-state power. A third controller powers up a 5V_DUAL plane by switching in the ATX 5V output in active states, or the ATX 5VSB in sleep states.
The RT9641C's operating mode (active-state outputs or sleep-state outputs) is selectable through two control pins: S3 and S5 Further control of the logic governing activation of different power modes is offered through two enabling pins: EN3VDL and EN5VDL. In active states, the 3.3V_DUAL linear regulator uses an external N-channel pass MOSFET to connect the output (V_OUT1) directly to the 3.3V input supplied by an ATX (or equivalent) power supply, while incurring minimal losses. In sleep state, the 3.3V_DUAL output is supplied from the ATX 5VSB through a NPN transistor, also external to the controller. Active state power delivery for the 2.5V/3.3V V_MEM output is done through an external NPN or a NMOS transistor. In sleep states, conduction on this output is transferred to an internal pass transistor. The 5V_DUAL output is powered through two external MOS transistors. In sleep states, a PMOS (or PNP) transistor conducts the current from the ATX 5VSB output, while in active states, current flow is transferred to a NMOS transistor connected to the ATX 5V output. Similar to the 3.3V_DUAL output, the operation of the 5V_DUAL output is dictated not only by the status of the S3 and S5 pins, but that of the EN5VDL pin as well.