描述 Description

The uP1591 is a cost effective, dual synchronous buckcontroller with 5V/3.3V 100mA LDOs for notebook systempower supply solution. The synchronous buck controlleradopts the proprietary RCOTTM technology that providesfast transient response, easy setting and high noiseimmunity. The uP1591 supports 260-kHz VCLK signal thatdrives an external charge pump. Each buck controller hasindividual enable/disable control input for system powersequence. Each LDO is capable of delivering 100mAoutput current. This device supports a VCLK signal outputthat drives an external charge pump circuit.

Other features include internal soft-start, soft-dischargeoutput at disable state, power OK indication, individualcurrent limit setting, and diode emulation mode operationat light load. This part provides comprehensive protections,including over voltage protection, under voltage protection,over current protection, input voltage UVLO and thermalshutdown.

The uP1591 is available in the space saving WQFN3x3-20L package.

特性 Features

·Wide Input Voltage Range: 5V to 26V.
·Two Synchronous Buck Controllers
·RCOTTM (Robust Constant On-Time) Control.
·Internal Bootstrap Switch.
·300kHz/355kHz (Ch1/Ch2) Switching Frequency in CCM.
·Diode Emulation Mode Operation at Light Load.
·Individual Enable/Disable Control.
·Individual Current Limit Setting.
·4500ppm/°C RDS(ON) Current Sensing.
·Internal Soft-Start.
·Output Discharge at Disable State.

·5V/3.3V LDOs with 100mA Output Current Capability.
·VCLK Output for Charge Pump.
·Power OK Indicator.
·Protections: OVP/UVP/OCP/UVLO/Thermal Shutdown.
·WQFN3x3 - 20L Package.
·RoHS Compliant and Halogen Free.

應(yīng)用 Application

·Notebook Computers.
·5V/3.3V System Power Supplies.
·3-4 Cell Li-Ion Battery-Power Devices.