SG1577A

The SG1577A is a high-efficiency, voltage-mode, dual-channel, synchronous DC/DC PWM controller for two independent outputs. The two channels are operated out of phase. The internal reference voltage is trimmed to 0.7V±1.5%. It is connected to the error amplifier’s positive terminal for voltage feedback regulation. The soft-start circuit ensures the output voltage can be gradually and smoothly increased from zero to its final regulated value. The soft-start pin can also be used for chip-enable function. When two soft-start pins are grounded, the chip is disabled and the total operation current can be reduced to under 0.7mA. The fixed-frequency is programmable from 60kHz to 340kHz. The Over-Current Protection (OCP) level can be programmed by an external current sense resistor. It has two integrated sets of internal MOSFET drivers. SG1577A is available in a 20-pin SOP package.

• Fairchild 1,000 piece Budgetary Pricing. *
• If there is no sample button displayed at the top of the page, please contact one of the Fairchild distributors or your local sales office to obtain samples.
• Top mark packaging information for product SG1577A is available. **

Product	Product Status	Eco Status	*Pricing	Package Type	Leads	Packing Method	Package Drawing	**Package Marking Convention	RoHS IPC1752	RoHS/REACH/JIG Certificate of Compliance
SG1577ASY	Full Production	Green as of Sep 2009	$1.04	SOIC-Wide	20	TAPE REEL		Line 1:$Y (Fairchild logo) &Z (Asm. Plant Code) &2 (2-Digit Date Code) &K Line 2:SG1577A Line 3:SYA