LT1976B数据手册集成电路（IC）的DCDC开关稳压器规格书PDF

描述 Description

The LT®1976 is a 200kHz monolithic buck switching regulator that accepts input voltages up to 60V. A high efficiency 1.5A, 0.2 Ohm switch is included on the die along with all the necessary oscillator, control and logic circuitry. Current mode topology is used for fast transient response and good loop stability.
Innovative design techniques along with a new high voltage process achieve high efficiency over a wide input range. Efficiency is maintained over a wide output current range by employing Burst Mode operation at low currents, utilizing the output to bias the internal circuitry, and by using a supply boost capacitor to fully saturate the power switch. Patented circuitry maintains peak switch current over the full duty cycle range.* Shutdown reduces input supply current to less than 1µA. External synchronization can be implemented by driving the SYNC pin with logic-level inputs. A single capacitor from the CSS pin to the output provides a controlled output voltage ramp (soft-start). The device also has a power good flag with a programmable threshold and time-out and thermal shutdown protection.
The LT1976 is available in a 16-pin TSSOP package with Exposed Pad leadframe for low thermal resistance. The LT1977, a 500kHz increased switch frequency version of the LT1976, is also available. See the Applications Information section for selection criteria between the LT1976 and LT1977.
*Protected by U.S. Patents, including 6,498,466**See Burst Mode Operation section for conditions

特性 Features

·Wide Input Range: 3.3V to 60V
·1.5A Peak Switch Current
·Burst Mode® Operation: 100µA Quiescent Current**
·Low Shutdown Current: IQ < 1µA
·Power Good Flag with Programmable Threshold
·Load Dump Protection to 60V
·200kHz Switching Frequency
·Saturating Switch Design: 0.2 Ohm On-Resistance
·Peak Switch Current Maintained Over Full Duty Cycle Range*
·1.25V Feedback Reference Voltage
·Easily Synchronizable
·Soft-Start Capability
·Small 16-Pin Thermally Enhanced TSSOP Package

应用 Application

·High Voltage Power Conversion
·14V and 42V Automotive Systems
·Industrial Power Systems
·Distributed Power Systems
·Battery-Powered Systems

简介

LT1976B属于集成电路（IC）的DCDC开关稳压器。由制造生产的LT1976B稳压器 - DC-DC 开关稳压器DC-DC 开关稳压器 PMIC（电源管理集成电路）产品族中的产品是元器件级设备，用于需要稳定 DC 输入电压和/或将其转换为不同幅度的输出电压的应用。这些器件与称为“控制器”PMIC 的类似产品的区别在于集成了主开关元件，设备提供的电力会通过该元件。