LT1573 Datasheet | Linear Technology

LT1573 Low Dropout PNP Regulator Driver Features s s DESCRIPTIO s s s s s s s Low Cost Solution for High Current, Low Dropout Regulators Fast Transient Response Needs Much Less Bulk Capacitance Latching Overload Protection Minimizes Heat Sink Size Precision Output Voltage (1%) Single Supply Operation: VIN = 2.8V to 10V Small Surface Mount Package Capable of Very Low Dropout Voltage (<0.2V) Fixed or Adjustable Outputs Shutdown The LT ®1573 is a regulator driver IC designed to provide a low cost solution for applications requiring high current, low dropout and fast transient response. When bined with an external PNP power transistor, this device provides load current up to 5A with dropout voltages as low as 0.35V. The LT1573 circuitry is designed for extremely fast transient response. This greatly reduces bulk storage capacitance when the regulator is used in applications with fast, high current load transients. To keep cost and plexity low, the LT1573 uses a new time-delayed latching overcurrent protection technique that requires no external current sense resistor. Base drive is limited for instantaneous protection, and a time-delayed latch protects the regulator from continuous short circuits. The LT1573 is available as an adjustable regulator with an output range of 1.27V to 6.8V and with fixed output voltages of 2.5V, 2.8V and 3.3V. Output accuracy is better than 1% to meet the critical regulation requirement of fast microprocessors. A special 8-pin, fused-lead surface mount package is used to minimize regulator footprint and provide adequate heat sinking. U APPLICATIO S s s s s s s 3.3V to 2.5V Regulators Microprocessor Power Sources Post Regulator for Switching Supplies High Efficiency Linear Regulators Ultralow Dropout Regulators Low Voltage Linear Regulators , LTC and LT are registered trademarks of Linear Technology Corporation. TYPICAL APPLICATIO CC 100p F FB LATCH P VOUT VIN DRIVE RC 1k + CTIME GND VIN 5V LT1573 SHDN RD 24Ω RB...