HIP5020

Features:

• High Efficiency - Above 95%
• Integrated N-Channel Synchronous Rectifier and Upper MOSFETs - 75mW Each
• Wide Input Voltage and Load Range
        - 4.5VDC to 18VDC (5 to 12 NiCd Battery Cells)
        - Up to 3.5ADC
• Automatically Switches Regulation Mode
        - Current Mode Control for Excellent Performance at High Load Currents
        - Hysteretic Control for High Efficiency at Light Load Currents
• Flexible and Easy to Use
        - Ready-to-Use Example Applications
        - Custom Optimization with Small Components
        - Design and Simulation Software Available
• Integrated, Low-Loss Current Sensing
• Over-Current Protection
• Adaptive Dead-Time - Eliminates Shoot-Through
• 100kHz to 1MHz PWM Switching Frequency
• Thermally Enhanced SOIC Package


Application

• Notebook Computers
• Portable Telecommunications
• Portable Instruments


Pinout




Specifications

Input Voltage, V_IN . . . . . . . . . . . . . . . . . . . . . . . . . .-0.3V to +20.0V
Supply Voltage, V_CC . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to +20.0V
Shutdown Voltage . . . . . . . . . . . . . . . . . . . . . . . .-0.3V to V_CC+0.3V
Voltage on PGND. . . . . . . . . . . . . . . . . . . . . . -2V to +2V (Transient)


Description

The HIP5020 is a high-efficiency, buck converter controller with synchronous rectification and integral power MOSFETs. Integrated current sensing eliminates the external resistor and saves power. The HIP5020 controller combines two methods of regulation: Current mode control for outstanding regulation response to large signal load transients, and Hysteretic mode control for high efficiency at low output currents.

The HIP5020 controller offers a high degree of flexibility. Small components set the switching frequency, the soft-start interval and the load current boundary between Run and Hysteretic modes. These adjustments enable the designer to best optimize the trade-offs of cost, efficiency and size.

The example application guide section illustrates these trade-offs with component and vendor suggestions for three circuit designs. These designs are suitable for use without modification. However, the block diagram, detailed description and HIP5020 component specifications enable further optimization to meet specific requirements.