2x ANPEC APW7088 Two – Phase Buck PWM Controller IC Chip

    The APW7088, two-phase PWM control IC, provides a precision voltage regulation system for advanced graphic microprocessors in graphics card applications. The Supply Voltage integration of power MOSFET drivers into the controller IC reduces the number of external parts for a cost and space saving power management solution. The APW7088 uses a voltage-mode PWM architecture, operating with fixed-frequency, to provides excellent load transient response. The device uses the voltage across the DCRs of the inductors for current sensing. Load line voltage positioning (DROOP), channel-current balance and over-current protection are accomplished through continuous inductor DCR current sensing. The MODE pin programs single- or two- phase operation. When IC operates in two-phase mode normally, it can transfer two-phase mode to single phase mode at liberty. Nevertheless, once operates in single-phase mode, the operation mode is latched. It is required to toggle SS or 5VCC pin to reset the IC. Such feature of the MODE pin makes the APW7088 ideally suitable for dual power input applications, such as PCIE interfaced graphic cards. This control IC‘ s protection features include a set of sophisticated over temperature, over-voltage, under- voltage, and over-current protections. Over-voltage re- sults in the converter turning the lower MOSFETs on to clamp the rising output voltage and protects the microprocessor. The over-current protection level is set through external resistors. The device also provides a power-on-reset function and a programmable soft-start to prevent wrong operation and limit the input surge V OUT current during power-on or start-up. The APW7088 is available in a QFN4x4-24 package.

24 PIN