LM1770TMFX/NOPB

Frequency - Switching:	100kHz ~ 1MHz
Base Part Number:	LM1770
Supplier Device Package:	SOT-23-5
Package / Case:	SC-74A, SOT-753
Operating Temperature:	-40°C ~ 125°C (TJ)
Control Features:	--
Serial Interfaces:	--
Clock Sync:	No
Synchronous Rectifier:	Yes
Duty Cycle (Max):	--
Series:	--
Voltage - Supply (Vcc/Vdd):	2.8 V ~ 5.5 V
Output Phases:	1
Number of Outputs:	1
Topology:	Buck
Output Configuration:	Positive
Function:	Step-Down
Output Type:	Transistor Driver
Part Status:	Active
Packaging:	Tape & Reel (TR)

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The LM1770TMFX/NOPB is a monolithic integrated circuit designed for a wide range of DC DC switching controllers applications. This product combines the control, power control and protection functions with a single chip, thus providing a reliable and cost-effective way to optimize power conversion performance.

The LM1770TMFX/NOPB comprises power switches with selectable logic levels and an overvoltage protection circuit. It allows for a wide range of control signals from a variety of logic levels, minimizing logic losses and increasing efficiency. The controller also allows for variable frequency operation and is highly efficient. The LM1770TMFX/NOPB can be used for step-up (boost), step-down (buck), or inverting (flyback) converters, and can be used in applications such as power supplies, motor drives, battery chargers, or automotive applications.

The core of the LM1770TMFX/NOPB is a PWM (Pulse Width Modulation) based closed loop control system. This consists of an error amplifier, a reference source, a comparator, and a hysteresis circuit. The controller operates on a fixed frequency, which may be pre-defined, or may be selectable via external pins. The controller provides a transfer function between the input and output, which is further modified by external components. In addition, the LM1770TMFX/NOPB provides for a very simple protection system which monitors the output voltage and current levels and shuts down when these levels become excessive.

The LM1770TMFX/NOPB also provides for a wide variety of user-definable parameters via external pins. These include adjustable loop response, output voltage, current and frequency margins, among others. This allows users to tailor the control characteristics to suit their particular application requirements.

The LM1770TMFX/NOPB is an ideal solution for a variety of DC DC switching controllers applications. The low switching frequency and high efficiency of the controller make it an ideal choice for a wide variety of power conversion applications. The convenient selectable logic levels, open loop protection system and wide range of adjustable parameters make it an ideal choice for a wide variety of applications.

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