CR2032 battery.LM15721.5A500KHz switching power supply circuit

LM1572 is a 500kHz frequency step-down switching pulse width modulation voltage stabilizing circuit. It can drive a 1.5A load, occupies a small PCB space, has excellent current response characteristics and a wide operating voltage range. It is a U.S. National Semiconductor The company uses advanced analog bipolar CMOS and DMOS processing techniques to provide higher efficiency at higher switching frequencies. The built-in 150mΩ field effect power transistor can provide greater power in a smaller package. The LM1572 has programmable soft-start and frequency feedback circuitry to protect against surge currents, enabling sequential TTL-compatible cut-off functions. The standby state has a pull-up current of 2.3mA, and the power consumption in the cut-off state is only 26uA. The LM1572 is available in a TSSOp-16 package with adjustable or fixed outputs of 5.0V and 3.3V. The adjustable form can achieve continuous adjustment from 2.42V to 5.0V. Its main features are as follows:
Key Features: 500kHz switching clock and small package form. Built-in 150Ω field effect power MOSFET. Can drive 1.5A current load. Current control mode. Programmable soft start function. Built-in slope compensation function. Compatible with TTL circuits. Fixed 5V and 3.3V or adjustable output. The power consumption in the closed state is only 26uA. Cycle-by-cycle current suppression function. Short circuit and over temperature protection circuit. TSSOp-16 package form. LM1572 Data Sheet LM1572 Typical Application Circuit 1 LM1572 Typical Application Circuit 2 LM1572 Internal Block Diagram Technical Zone Isolated power supply design requires the development of the best topology. The heat dissipation problem of large power consumption and inefficient voltage regulator cannot be ignored. The power module cannot be ignored! Related knowledge about switching power supply. Can’t the switching power supply pass EMC? PCB drawing board engineers have an unshirkable responsibility! USBOTGVbus power supply block diagram and application solution