AP1516-33SA

AP1516 150KHz, 3A PWM Buck DC/DC Converter + 1A Ultra Low Drop Regulator Features * Channel 1: simple switch - Adjustable version output voltage range, 1.23V to 18V+4% & Fixed 3.3V version - 150KHz +20% fixed switching frequency - Voltage mode non-synchronous PWM control - ON/OFF shutdown control input - Operating voltage can be up to 20V - Output load current: 3A - Low power standby mode * Channel 2: ultra low drop regulator - Adjustable output voltage - 0.6V Maximum Dropout voltage at 1.0A Load current - Fast transient response - Good noise rejection * Channel 1 & Channel 2 - SOP-16L Pb-free package - Built-in switching transistor on chip - Thermal-shutdown and current-limit protection of each channel General Description The Channel 1 is a step-down DC/DC converter, and own the ability of driving a 3A load without additional transistor component. Due to reducing the number of external component, the board space can be saved easily. The external shutdown function can be controlled by logic level and then come into standby mode. The internal compensation makes feedback control have good line and load regulation without external design. Regarding protected function, thermal shutdown is to prevent over temperature operating from damage, and current limit is against over current operating of the output switch. If current limit function occurred and VFB is down to 0.5V below, the switching frequency will be reduced. The switching frequency of 150KHz thus allowing smaller sized filter components than what would be needed with lower frequency switching regulators. Other features include a guaranteed +4% tolerance on output voltage under specified input voltage and output load conditions, and +20% on the oscillator frequency. The channel 2 is a 1A regulator with extremely low dropout voltage. This product is specifically designed to provide well regulated supply for applications requiring 2.8V or lower voltages from 3.3V power supplies where high efficiency of a switcher can be achieved without the cost and complexity associated with switching regulator. Applications - PC Motherboard - LCD Monitor - Graphic Card - DVD-Video Player - NIC/Switch - Telecom Equipment - ADSL Modem - Printer and other Peripheral Equipment Pin Assignments ( Top View ) GND GND VOUT1 FB1 SD1 VIN2 VOUT2 VOUT2 1 2 3 4 5 6 7 8 16 15 14 13 Pin Descriptions Name GND GND Description Operating voltage input of channel 1 Channel 2 bias voltage Main power source of channel 2 Channel 1 switching output Channel 2 output Output1 voltage feedback control Output2 voltage feedback control Channel 1 ON/OFF shutdown Channel 2 output sense pin Ground VIN1 VB 12 VSENSE2 11 FB2 10 V OUT2 9 VOUT2 SOP-16L VIN1 VB VIN2 VOUT1 VOUT2 FB1 FB2 SD1 VSENSE2 GND This datasheet contains new product information. Anachip Corp. reserves the rights to modify the product specification without notice. No liability is assumed as a result of the use of this product. No rights under any patent accompany the sale of the product. Rev.1.1 May 23, 2005 1/10 AP1516 150KHz, 3A PWM Buck DC/DC Converter + 1A Ultra Low Drop Regulator Ordering Information AP1516 XX X X Output version Ch1: Blank : Adjustable -33 : 3.3V Package S: SOP-16L Packing Blank : Tube A : Taping Block Diagram SD VIN1 200mV Current Source bias 1.235V Reference 2.5V Regulator Start up 220mV + Comp _ Comp + Frequecy compensation FB1 Comp + VIN2 VB CURRENT LIMIT THERMAL SHUTDOWN + Anachip Corp. www.anachip.com.tw Rev.1.1 May 23, 2005 2/10 _ + _ + Amp _ Pre-driver 150kHz OSC. Thermal Limit 1.25V + _ 3A Switch VOUT1 GND VOUT2 VSENSE2 _ + FB2 AP1516 150KHz, 3A PWM Buck DC/DC Converter + 1A Ultra Low Drop Regulator Absolute Maximum Ratings Symbol VIN1, B VIN2 VSD VFB1 VOUT1 PD TST TOP VOP Parameter Supply Voltage Supply Voltage ON/OFF Pin Input Voltage Feedback Pin Voltage Output Voltage to Ground Power Dissipation Storage Temperature Operating Temperature Operating Voltage Rating +22 +14 -0.3 to +18 -0.3 to +18 -1 Internally limited -65 to +150 -40 to +125 +4.5 to +22 Unit V V V V V W o C o C V Electrical Characteristics (All Output Voltage Versions) Unless otherwise specified, VIN2=12V for 3.3V, ILOAD = 0.5A Sym. IB1 FOSC FSCP VSAT1 DC ICL1 IL IQ ISTBY VIL VIH IH IL θJC θJA Parameter Feedback Bias Current Oscillator Frequency Oscillator Frequency of Short Circuit Protect Saturation Voltage Max. Duty Cycle (ON) Min. Duty Cycle (OFF) Current Limit Output = 0 Output Leakage Output = -1 Current Quiescent Current Standby Quiescent Current ON/OFF Pin Logic Input Threshold Voltage ON/OFF Pin Logic Input Current ON/OFF Pin Input Current Thermal Resistance Conditions VFB1=1.3V (Adjustable version only) Min. Typ. -10 127 110 When current limit occurred and VFB1 < 0.5V, Ta=25 oC IOUT1=2A No outside circuit VFB1=0V force driver on VFB=0V force driver on VFB=12V force driver off Peak current No outside circuit VFB1=0V force driver on No outside circuit VFB1=12V force driver off VIN1=22V VFB1=12V force driver off ON/OFF pin=5V VIN1=22V Low (regulator ON) High (regulator OFF) VLOGIC=2.5V (OFF) VLOGIC=0.5V (ON) Junction to SOP-16L case 5 150 15 1.25 100 0 Max. -50 -100 173 173 25 1.4 1.5 Unit nA KHz KHz V % A 3.5 -200 -5 5 70 2.0 1.3 10 150 200 0.6 -0.01 -0.1 10 40 -1 o uA mA mA uA V uA C/W C/W Thermal Resistance with Junction to Copper Area of Approximately SOP-16L ambient 2 2 15 in + 15 in o Anachip Corp. www.anachip.com.tw Rev.1.1 May 23, 2005 3/10 AP1516 150KHz, 3A PWM Buck DC/DC Converter + 1A Ultra Low Drop Regulator Electrical Characteristics (Continued) Sym. VREF Test Condition o TJ=25 C,(VIN2-VOUT2)=0.5V, Reference Voltage IO=10mA VB =VIN2+1V IO2=10mA, VOUT2+0.5V