LTC1909-8 - LTC1909-8是Wide Operating Range, No Rsense Step-Down DC/DC Controller with SMBus Programming

LTC1909-8是LINEAR凌力尔特公司的一款数字可编程的降压型稳压器产品，LTC1909-8是LTC1909-8是Wide Operating Range, No Rsense Step-Down DC/DC Controller with SMBus Programming，本站介绍了LTC1909-8的封装应用图解、特点和优点、功能等，并给出了与LTC1909-8相关的LINEAR元器件型号供参考。

LTC1909-8 - LTC1909-8是Wide Operating Range, No Rsense Step-Down DC/DC Controller with SMBus Programming - 数字可编程的降压型稳压器 - 电源管理 - 凌力尔特

LTC1909-8 - Wide Operating Range, No Rsense Step-Down DC/DC Controller with SMBus Programming

LTC1909-8 - Wide Operating Range, No Rsense Step-Down DC/DC Controller with SMBus Programming - Linear Technology（凌力尔特）

功能描述

The LTC1909-8 is a synchronous step-down switching regulator controller with a digitally programmable output voltage. The output voltage is selected from one of two 5-bit settings programmed into internal registers via a 2-wire SMBus/I2C interface. The interface features safeguards against invalid output voltages and allows the microprocessor to turn the regulator on and off. Valley current control delivers very low duty cycles without requiring a sense resistor. Operating frequency is selected by an external resistor and is compensated for variations in VIN and VOUT.

Discontinuous mode operation provides high efficiency operation at light loads. A forced continuous control pin reduces noise and RF interference and can assist secondary winding regulation by disabling discontinuous mode operation when the main output is lightly loaded.

Fault protection is provided by internal foldback current limiting, an output overvoltage comparator and optional short-circuit shutdown timer.

The LTC1909-8 is available in the 28-lead SSOP package.

特点

SMBus/I2C? Programmable Output Voltage: 1.3V to 3.5V

No Sense Resistor Required

2% to 90% Duty Cycle at 200kHz

tON(MIN) </= 100ns

True Current Mode Control

Stable with Ceramic COUT

Power Good Output Voltage Monitor and 50μs Timer

Wide VIN Range: 4V to 36V (Abs Max)

Precision Resistor Divider and Reference Provide ±1.35% Output Voltage Accuracy Over Temperature