ISL8205M数据手册电源-板安装的直流转换器规格书PDF

描述 Description

The ISL8205M power module is a single channel synchronous step-down complete power supply, capable of delivering up to 5A of continuous current. Operating from a single 2. 6V to 5. 5V input power rail and integrating controller, power inductor and MOSFETs, the ISL8205M only requires a few external components to operate and is optimized for space constrained and portable battery operated applications. Based on current mode PWM control scheme, the ISL8205M provides a fast transient response and excellent loop stability as well as a very low duty cycle with an adjustable output voltage as low as 0. 6V and better than 1. 6% accuracy over line and load conditions. Operation frequency is selectable through an external resistor, with a 1. 8MHz default setting, or may be synchronized with an external clock signal up to 3. 5MHz. The ISL8205M also implements a selectable PFM mode to improve light-load efficiency and a 100% duty cycle LDO mode to extend battery life. A programmable soft-start reduces the inrush current required from the input supply while an automatic output discharge ensures a soft stop. Dedicated enable pin and power-good flag allow for easy system power rails sequencing. An array of protection features, including input Undervoltage Lockout (UVLO), over-temperature, overcurrent/short-circuit with hiccup mode, overvoltage and negative overcurrent, guarantees safe operations under abnormal operating conditions. The ISL8205M is available in a compact RoHS compliant 22 Ld 4. 5x7. 5x1. 85mm QFN package.

特性 Features

• 5A single channel complete power supply
• Integrates controller, MOSFETs and inductor
• Pin/function compatible with the 3A ISL8202M
• 2.6V to 5.5V input voltage range
• Adjustable output voltage range
• As low as 0.6V with ±1.6% accuracy over line/load/temperature
• Up to 95% efficiency
• Default 1.8MHz current mode control operations
• 680kHz to 3.5MHz resistor adjustable
• External synchronization up to 3.5MHz
• Selectable light-load efficiency mode
• 100% duty cycle LDO mode
• Programmable soft-start
• Soft-stop output discharge
• Dedicated enable pin and power-good flag
• UVLO, over-temperature, overcurrent, overvoltage and negative overcurrent protections
• Overcurrent/short-circuit hiccup mode
• 4.5mmx7.5mmx1.85mm 22 Ld QFN package