UPC1933 Datasheet | NEC

ESCRIPTION The µ PC1933 is an IC that controls a low-voltage input DC-DC converter. This IC is suitable for an operation with3-V, 3.3-V input or a lithium ion secondary battery input, because the minimum operating supply voltage is 2.5 V. Because of its wide operating voltage range, it can also be used to control DC-DC converters that use an AC adapter for input. Features - Low supply voltage: 2.5 V (MIN.) - Operating voltage range: 2.5 to 20 V (breakdown voltage: 30 V) - Timer latch circuit for short-circuit protection. - Ceramic capacitor with low capacitance (0.1 µ F) can be used for short-circuit protection. - Open drain output (1 cannel: This output can be used to control a step-down converter, a step-up converter.) - Dead time is internally fixed to 85 %. - Soft start function (with a circuit to convert the timer latch circuit.) ORDERING INFORMATION Part Number Package 8-pin plastic SOP (5.72 mm (225)) µ PC1933GR The information in this document is subject to change without notice. Before using this document, please confirm that this is the latest version. Not all devices/types available in every country. Please check with local NEC representative for availability and additional information. Document No. G13690EJ3V0DS00 (3rd edition) Date Published April 2000 NS CP (K) Printed in Japan The mark 5 shows major revised points. 1998 µ PC1933 BLOCK DIAGRAM FB 8 RT 7 GND 6 OUT 5 Oscillation section MOS input - + Internal fixed voltage Soft start select switch Timer latch for short-circuit protection section DTC (Internal fixed) Reference voltage section E/A PWM MOS output - + + 1 II 2 DLY 3 VCC 4 VREF Data Sheet G13690EJ3V0DS00 µ PC1933 PIN CONFIGURATION (Top...