器件名称:
ADT7221
功能描述:
power supply chip with 5V regulated output
文件大小:
118.02KB 共6页
简 介:
ADT7221 General Description The ADT7221 is a power supply chip with 5V regulated output. It is composed of one PWM controller and one LDO regulator. It provides the pure and excellent regulated output voltage. 1 A50 2 3 6 5 4 Package outline of the ADT7221 Features Input voltage range : 7V to 15V Regulated output voltage : 5V 350mA output load current available Externally composed LDO pass transistor 500kHz fixed frequency internal oscillator Over voltage protection Applications DC-DC Converter for 5V output CCD Camera module Navigation & Portable Devices PWM controller with built-in compensation components Small outline SOT-26 package (2.9mm x 1.6mm body) Typical Application Circuit VIN (12V) C2 VIN DRV Q1 A50 GND OUT C3 OUT PWM FB (ADT7221) L1 U1 C1 * This specifications are subject to be changed without notice Jun. 16. 2008 / Rev. 0.1 1/6 http://www.ad-tech.co.kr ADT7221 Part List Component U1*1 Q1 L1 C1 C2 C3 Description Composite type with a PNP transistor and schottky barrier diode PNP transistor Output filter inductor Output filter capacitor Bypass capacitor Load capacitor for LDO IC Chip transistor Chip inductor Tantalum capacitor Tantalum capacitor Tantalum capacitor Type FP103 MMBT589LT1 47uH/590mA 47uF/10V 10uF/25V 1uF/10V Value *1 : For cost down , it is possible to use discrete component with a PNP transistor and a schottky barrier diode. In this case, you make use the discrete components with proper electrical specification. Ta……