ACE710 0.9V startup, 0.6A 3.3V/5V Synchronous Boost DC/DC Converter Description ACE710 is a high-efficiency, synchronous step-up switching regulators optimized for battery-powered applications. It supports up to 0.6A load current and allows the use of small, low cost inductors and MLCC capacitors. The ACE710 starts up as low as 0.9V input voltage and it has true-shutoff function (shut off output to zero voltage when EN pulled low) and real output short-circuit protection. These features make it ideal for USB interface power supply. Given its high efficiency, the ACE710 device is ideal for small portable applications powered by battery. It consumes as low as 40uA (3V input /3.3V output) at zero load. And its current consumption is less than 1uA in shutdown mode. Features Fixed output voltage: 2.1, 3.3V, 5V Capable of Delivering 0.6A output current High Efficiency: Up to 92% Compatible with MLCC capacitor 1.8MHz Switching Frequency Low dropout 100% Duty operation 0.6V Reference for Low Output voltages True Shutoff and Short-Circuit Protection Logic Control Shutdown (IQ<1uA) Thermal shutdown and UVLO Application MID / Tablet PC Portable Power Bank Smartphone OTG Toy Other portable device Absolute Maximum Ratings Parameter Max Unit Max Input Voltage 5.5 V Max Operating Junction Temperature(TJ) 125 O C Ambient Temperature(TA ) -40~85 O C Maximum Power Dissipation 400 Storage Temperature(Ts) -55~150 ESD (HBM) >2000 mW O C V Note: Exceed these limits to damage to the device. Exposure to absolute maximum rating conditions may affect device reliability. VER 1.3 1 ACE710 0.9V startup, 0.6A 3.3V/5V Synchronous Boost DC/DC Converter Packaging Type SOT-23-5 5 1 SOT-23-5 Description 4 2 3 1 VOUT 2 GND 3 EN 4 VIN 5 SW Function Output voltage pin, with 22uF ceramic capacitor closely connected to GND Ground Enable pin for the IC. Drive the pin to high to enable the part, and low to disable Supply voltage, with 4.7uF ceramic capacitor connected to GND To connect inductor to VIN Ordering information ACE710 XX XX + H Halogen - free Pb - free BN : SOT-23-5 Output Voltage: 2.1V / 3.3V / 5.0V Block Diagram VER 1.3 2 ACE710 0.9V startup, 0.6A 3.3V/5V Synchronous Boost DC/DC Converter Recommended work conditions Parameter Input Voltage Range Max Unit 5 V Operating Junction Temperature(TJ) -40~85 O C Electrical Characteristics O Vin=5V, TA=25 C Symbol Parameter VIN Input Voltage Range Vstart Startup Voltage Iout = 0 A Vout Fixed Output Voltage Iout=100mA, Vout/Vout_set Iq Quiescent Current Irev Reverse current, Vout to Vin Fsoc Switching Frequency 1.8 RDS(ON) P PMOS RDS(ON) 150 300 mΩ RDS(ON) N NMOS RDS(ON) 150 300 mΩ Llimit Peak Current Limit 1.5 2 A Lswlk SW Leakage Current 10 uA Lenlk EN Leakage Current 1 uA Vh_en EN Input High Voltage Vl_en EN Input Low Voltage TSD Thermal Shut Down Test Conditions Min Typ Max 0.9 Unit 5 V 0.9 1.0 V 1 1.03 % Active, Vout=5.5V, No Switching 40 60 uA Shutdown 1 10 uA 5 uA 0.97 EN=0 1.2 SW=5V, EN=0 MHz 0.6 V 0.3 150 V O C Typical Application Circuit VER 1.3 3 ACE710 0.9V startup, 0.6A 3.3V/5V Synchronous Boost DC/DC Converter Typical Performance Characteristics O Tested under TA=25 C, L=6.8uH, unless otherwise specified VER 1.3 4 ACE710 0.9V startup, 0.6A 3.3V/5V Synchronous Boost DC/DC Converter Typical Performance Characteristics O Tested under TA=25 C, L=6.8uH, unless otherwise specified Detailed description General description The ACE710 is a high-efficiency, Boost DC/DC converter, with input current limit at 1.5A. It integrates an 150mΩ high side MOSFET and an 150 mΩ low side MOSFET. It employs PWM/PFM auto-switch control mode. Short circuit protection ACE710 employs a “Hiccup” mode of short-circuit protection, which enables output voltage auto recover when short-circuit is removed. VER 1.3 5 ACE710 0.9V startup, 0.6A 3.3V/5V Synchronous Boost DC/DC Converter True shut off function ACE710 offers a true shut off function, which means it can really shut off output (make output voltage to zero) when EN is pull low (chip turns off). Normally, there is a schottky diode (or MOSFET body diode) existed between SW and Vout for a normal boost converter, and thus, when EN is pull low, though the chip is turned off, the Vin is connected to Vout thru inductor and schottky diode. So we still can detect a voltage at Vout terminal. ACE710, with its proprietary design skill, can truly shut down the output when chip is turned off. Design Procedure Setting Output Voltages Output voltages are set by external resistors. The FB_ threshold is 0.6V. RTOP = RBOTTOM[(VOUT / 0.6) - 1] Capacitor Selection A 22uF ceramic capacitor is demanded on output terminal, while 4.7uF is good enough for input. Higher values, lower cost ceramic capacitors are now becoming available in smaller case sizes. Their high ripple current, high voltage rating and low ESR make them ideal for switching regulator applications. Using ceramic capacitors can achieve very low output ripple and small circuit size. When choosing the input and output ceramic capacitors, choose the X5R or X7R dielectric formulations. These dielectrics have the best temperature and voltage characteristics of all the ceramics for a given value and size. Application Information Layout is critical to achieve clean and stable operation. The switching power stage requires particular attention. Follow these guidelines for good PC board layout: 1. Place 22uF output capacitors as close to the IC VOUT and GND pins as possible 2. Connect input and output capacitors to the same power ground node with a star ground configuration then to IC ground. 3. Keep the high-current paths as short and wide as possible. Keep the path of switching current short. Avoid vias in the switching paths. 4. If possible, connect VIN, SW, and GND separately to a large copper area to help cool the IC to further improve efficiency and long-term reliability. 5. Ensure all feedback connections are short and direct. Place the feedback resistors as close to the IC as possible. 6. Route high-speed switching nodes away from sensitive analog areas VER 1.3 6 ACE710 0.9V startup, 0.6A 3.3V/5V Synchronous Boost DC/DC Converter Packing Information SOT-23-5 VER 1.3 7 ACE710 0.9V startup, 0.6A 3.3V/5V Synchronous Boost DC/DC 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