LTC1909-8 - LTC1909-8是Wide Operating Range, No Rsense Step-Down DC/DC Controller with SMBus Programming
LTC1909-8是Linear公司的一款数字可编程的降压型稳压器产品，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相关的凌力尔特元器件型号供参考。
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 Adjustable Switching Frequency and Current Limit Forced Continuous Control Pin Programmable Soft-Start Output Overvoltage Protection Optional Short-Circuit Shutdown Timer Available in a 28-Lead SSOP Package应用
Power Supplies for DSPs, ASICs, FPGAs and CPUs Voltage Margining以下列出了不同封装及包装形式的具体型号,并标出了直接在linear官网上订货的价格（美元）
| 器件型号 | 封装 | 温度 | 价格 (以 1 ~ 99 片为批量) | 价格 (以 1000 片为批量) |
| LTC1909-8EG | SSOP-28 | E | $5.98 | $5.05 |
| LTC1909-8EG#PBF | SSOP-28 | E | $5.98 | $5.05 |
| LTC1909-8EG#TR | SSOP-28 | E | | $5.15 |
| LTC1909-8EG#TRPBF | SSOP-28 | E | | $5.15 |
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