描述 Description

The uP1586 is a dual synchronous buck controller with5V/3.3V 100mA LDOs for notebook system power supplysolution.

The uP1586 supports high efficiency, fast transientresponse and provides a combined POK signal. Theultrasonic mode maintains the switching frequency aboveaudio frequency, which eliminates noise in audioapplications. The proprietary RCOTTM technology providesfast transient response and high noise immunity.

The uP1586 has internal soft-start to control the inrushcurrent. Other features include overcurrent protection,overvoltage protection, power-up sequencing, power OKoutput, and thermal shutdown. The uP1586 is availablein the space saving package VQFN4x4-24L, specified from-40°C to 85°C.

特性 Features

? Wide Input Voltage Range: 6V to 26V
? Two Synchronous Buck Controllers
? Dual Fixed 5V/3.3V Outputs or Adjustable from 2V to 5.5V
? Selectable PWM, DEM and USM in Light Load
? Internal Soft-start and Soft-Discharge
? RCOTTM (Robust Constant On-Time) Control Architecture
? 4500ppm/OC RDS(ON) Current Sensing

? 100mA 5V/3.3V LDO with Switches
? Secondary FB Input Maintains Charge Pump Voltage (uP1586R)
? 2V ± 1% Reference Voltage Output
? Power OK Indicator
? OVP/UVP/OCP/OTP
? VQFN4x4-24L
? RoHS Compliant and Halogen Free

應用 Application

? Notebook and Subnotebook System Power Supplies
? 3-4 Cell Li-Ion Battery-Power Devices
? Dual Output Supplies for DSP, Memory, Logic and Microprocessor