UPC1934 Datasheet | NEC

ESCRIPTION The µ PC1934 is an IC that controls a low-voltage input DC-DC converter. This IC is suitable for an operation with 3-V, 3.3-V input or a lithium ion secondary battery input, because the minimum operation 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 outputs (Each of the outputs can be used to control a step-down converter, a step-up converter and an inverted converter.) - Can control two output channels. ORDERING INFORMATION Part Number Package 16-pin plastic SSOP (5.72 mm (225)) 16-pin plastic TSSOP (5.72 mm (225)) µ PC1934GR-1JG µ PC1934GR-PJG 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. G13567EJ3V0DS00 (3rd edition) Date Published April 2000 NS CP (K) Printed in Japan The mark 5 shows major revised points. 1998 µ PC1934 BLOCK DIAGRAM Channel 2 VREF 16 DLY 15 IN2 14 II2 13 FB2 12 DTC2 11 MOS output Reference voltage section Timer latch for short-circuit protection section MOS input - + E/A2 - - + PWM2 OUT2 10 VCC 9 MOS output + Oscillation section - E/A1 + - - PWM1 MOS input 1 CT 2 RT 3 IN1 4 II1 5...