EZ1900 Datasheet | SEMTECH

DESCRIPTION The EZ1900 is a high performance positive load current balancer designed for use in applications utilizing 2 regulators in parallel to achieve equal current sharing or identical current for each load. The regulator balance controller allows a flexible motherboard design to be made to cope with different processor configurations. The controller reads a logic level upgrade signal (denoted VCC2DET on the Intel P55C; similar on AMD, Cyrix and Power PC microprocessors) to control the output voltage of two linear low dropout voltage regulators to the CPU core and I/O planes. In single-voltage plane configurations (VCC2DET floating), both regulators are set to the same output voltage (usually 3.3 - 3.5V) and are configured in masterslave mode. For split plane processors (VCC2DET low), the outputs of the two regulators are switched - the core voltage will be set to a nominal 2.5V while the I/O voltage will remain at 3.3V. The actual output voltages can be adjusted by means of resistors. The EZ1900 programmable current balancer is available in the popular SO-8 surface mount package. Features - - - - - - Current balance controller for regulators in parallel Slave and non-slave voltage modes Slave or non-slave mode puter selected patible with 3 or 5 pin low drop regulators Remote sense operation SO-8 package APPLICATIONS - - - - Flexible upgrade from single voltage plane to split-plane processors Intel Pentium® Processor P54CS & P55C upgrades Power PC™ 603 & 604 upgrades AMD5K86™ upgrades ORDERING INFORMATION DEVICE EZ1900CS Note: (1) Add suffix ‘TR’ for tape and reel. (1) PACKAGE SO-8 PIN CONFIGURATION ABSOLUTE MAXIMUM RATINGS Parameter Input Voltage Supply Differential Amplifier Pin # 1 2 3 4 5 6 7 8 Legend Sel -IN +IN -V nc SOUT +V nc Description Non-slave mode, voltage select Negative error amplifier input Positive error amplifier input Power input, mon No Connection Sets VOUT of slave device Power input, positive No connection Slave Output Current (sink...