ACE723A 3A 1.5MHz 5.5V Synchronous Buck Converter Description The ACE723A is a high efficiency synchronous, buck DC/DC converter. Its input voltage range is from 2.6V to 6V and provides an adjustable regulated output voltage from 0.8V to 5.5V while delivering up to 3A of output current. The internal synchronous switches efficiency and eliminate the need for an external Schottky diode. The switching frequency is set by an external resistor or can be synchronized to an external clock. The 100% duty cycle provides low dropout operation extending battery life in portable systems. The ACE723A is operated in PFM/PWM auto-switch mode which enhance the efficiency at light-load. Features Adjustable Output Voltage, Vfb=0.8V Maximum output current is 3A Range of operation input voltage: Max 6V Standby current: 0.5mA (typ.) Line Regulation: 0.1%/V (typ.) Load Regulation: 10mV (typ.) High efficiency, up to 96% Environment Temperature: -20 OC~85 OC Application Power Management for 3G modem 3W LED driver from Li-ion battery LCD Monitor and LCD TV DVD Decode Board ADSL Modem Post Regulators for Switching Supplies Typical Application ACE723A VER 1.3 1 ACE723A 3A 1.5MHz 5.5V Synchronous Buck Converter Absolute Maximum Ratings Parameter Symbol Max Input voltage VIN 6 Unit V Operating Junction Temperature TJ 125 O Ambient Temperature TA -20 ~ 85 O Package Thermal Resistance DFN 2*2-8 Storage temperature O 25 TS - 40 ~ 150 ESD (HBM) >2000 C C C/W O C V Note: Exceed these limits to damage to the device. Exposure to absolute maximum rating conditions may affect device reliability. Packaging Type DFN2*2-8 EN 1 DFN3*3-10 8 COMP GND 2 7 FB LX 3 6 VDD PGND 4 5 PVDD EN 1 10 COMP GND 2 9 FB LX 3 8 VDD LX 4 7 PVDD PRND 5 6 PVDD Ordering information ACE723A XX + H Halogen - free Pb - free DN: DFN2*2-8 ON: DFN3*3-10 Recommended Work Conditions Item Min Input Voltage Range Operating Junction Temperature (TJ) -20 Max Unit 6 V +125 ℃ VER 1.3 2 ACE723A 3A 1.5MHz 5.5V Synchronous Buck Converter Electrical Characteristics (VDD=5V,TA=25℃) Parameter Symbol Conditions Min Input Voltage Range VDD 2.6 Feedback Voltage Vref 0.784 Feedback Leakage current Ifb Quiescent Current Iq Line Regulation Typ Max Units 5.5 V 0.8 0.816 V 0.1 0.4 uA Active, Vfb=0.78, No Switching 450 uA Shutdown 1 uA LnReg Vin=4V to 5.5V 0.1 %/V Load Regulation LdReg Iout=1 to 3A 0.02 %/A EA Transconductance Gm 600 us Switching Frequency Fsoc 1.35 MHz PMOS Rdson RdsonP 150 Ω NMOS Rdson RdsonN 130 Ω Peak Current Limit Llimit 3.8 A EN Shutdown Voltage Ven Ren =180K Vin-0.7V Vin Typical Performance Characteristics Efficiency vs. Output Current Load Regulation (Vout=1.0V) (Vout=1.0V) Output Current (mA) Output Current (mA) VER 1.3 3 ACE723A 3A 1.5MHz 5.5V Synchronous Buck Converter Efficiency vs. Output Current Load Regulation (Vout=3.3V) (Vout=3.3V) Output Current (mA) Quiescent Current vs. Input Voltage Input Voltage (V) Frequency vs. Temperature (VIN=5V) Temperature (℃) Output Current (mA) Current Limit vs. Input Voltage Input Voltage (V) Output Voltage vs. Temperature (VIN=5V) Temperature (℃) VER 1.3 4 ACE723A 3A 1.5MHz 5.5V Synchronous Buck Converter Power On & Soft Start Load Transient Response Detailed description ACE723A is a 3A synchronous buck, with frequency adjusted by Ren_. It can achieve conversion efficiency up to 95%. It also support 100% duty cycle which will maximize the battery usage. Only a inductor and a few R & C need for peripheral. The PCB size can be very small Please note that EN_ pin has to be pull high if one wants to shutdown the chip. And release it (with a Ren_ connected to GND) to have it work. One can also switch off ACE723A by connect enable signal with at least 1mA driving capability to VDD pin (pin 6 of DFN2x2 and pin 8 of DFN3x3 package). VER 1.3 5 ACE723A 3A 1.5MHz 5.5V Synchronous Buck Converter Packing Information DFN2*2-8 TOP VIEW BOTTOM VIEW Pin 1 dot by marking Pin #1 identification chamfer Side view Common Dimensions (mm) PKG. W:very very thin REF. MIN. NOM. MAX. A 0.70 0.75 0.80 A1 0.00 0.05 A3 0.2 REF. D 1.95 2.00 2.05 E 1.95 2.00 2.05 B 0.18 0.23 0.30 L 0.25 0.35 0.45 D2 1.05 1.20 1.30 E2 0.45 0.60 0.70 e 0.50 BSC VER 1.3 6 ACE723A 3A 1.5MHz 5.5V Synchronous Buck Converter Packing Information DFN3*3-10 Symbol A A1 A3 b D D2 E E2 e L Dimensions in millimeters MIN. MAX. 0.700 0.800 0.000 0.050 0.175 0.250 0.180 0.300 2.950 3.050 2.300 2.650 2.950 3.050 1.500 1.750 0.500 0.350 0.450 VER 1.3 7 ACE723A 3A 1.5MHz 5.5V Synchronous Buck Converter Notes ACE does not assume any responsibility for use as critical components in life support devices or systems without the express written approval of the president and general counsel of ACE Electronics Co., LTD. As sued herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and shoes failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user. 2. A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. ACE Technology Co., LTD. http://www.ace-ele.com/ VER 1.3 8