Lt3579 is an ideal choice for many local power supply designs. It can be easily configured as boost, SEPIC, negative output or flyback structure, and can generate 12V / 1.7A or – 12V / 1.2A output from a 5V input. In addition, the slave switch of lt3579 allows the device to be configured into a high voltage, high power charging pump topology, which has very high efficiency and requires fewer components than traditional circuits.
The switching frequency range of lt3579 can be set between 200kHz and 2.5MHz. The device can be internally timed and its clock oscillation frequency is set by a resistor connected between the RT pin and ground, or it can be synchronized to an external clock. A buffered version of the clock signal is discharged from the clkout pin and can be used to synchronize other compatible switching regulator ICs to the lt3579.
Lt3579 also has an innovative SHDN pin circuit, which can accept slowly changing input signals and provides an adjustable undervoltage locking function. In addition, the device integrates additional functions such as frequency turn back and soft start. Lt3579 adopts 20 pin tssop package and 20 pin 4mmx5mmqfn package.
6a, 42V combined power switch
Output short circuit protection
Wide input range: 2.5V to 16V, maximum transient voltage 40V
Lt3579-1: dual phase operation
Master / slave (3.4A / 2.6a) switch design
User configurable undervoltage blocking
It can be easily configured as a boost, SEPIC, negative output or flyback converter
Low vcesat switch: 250Mv at 5.5A (typical value)
Synchronized to external clock
Other switching regulators can be synchronized
The high gain SHDN pin can accept slowly varying input signals
20 pin tssop package and 20 pin 4mmx5mmqfn package
Local power supply
Vacuum fluorescent display (VFD) bias power supply
TFT-LCD bias power supply
Vehicle engine control unit (ECU) power supply
Editor in charge: GT