SS6563

SS6563 Versatile DC/DC Converter FEATURES Operates from 3V to 30V input voltage Internal 2A peak current switch. Continuous output current of 1.5A Bootstrapped driver. High-side current sense capability. High efficiency (up to 90%). Internal ±2% reference. Low quiescent current at 1.6mA. Operating frequency from 100Hz to 100KHz. DESCRIPTION The SS6563 is a monolithic control circuit that provides the primary functions required for DC to DC converters and high-side-sensed constant current sources. The device consists of an internal temperature compensated reference, comparator, controlled duty-cycle oscillator with an active current-sense circuit, bootstrapped driver, and high-current output switch. This device is specifically designed to construct a constant current source for battery chargers with a minimum number of external components. A bootstrapped driver can drive the NPN output switch to saturation for higher efficiency and less heat dissipation. The SS6563 can deliver 1.5A continuous current without requiring a heat sink. APPLICATIONS Constant Current Source for Battery Chargers. Saver for Cellular phones. Step-Down DC/DC Converter Module. TYPICAL APPLICATION CIRCUIT D3 R1 470 D2 1N4148 C3 1N4148 L1 300µH D1 1N5819 R2 390K C2 1000pF RB RA 1K 3K + C4 470µF 5V/1A When VIN>15V make R1=1K + 1µF 8 1 2 3 4 BOOST IS DC DE CF GND VIN 8V~25V + RS 0.22 7 6 VCC C1 100µF 5 FB SS6563 R3 2.2M Line Regulation Load Regulation Short Circuit Current VIN = 10V~20V @ IO=...