AP5004 PWM CONTROL 2.5A STEP-DOWN CONVERTER Description Pin Assignments The AP5004 is a step-down switching regulator with PWM (Top View ) control and includes a reference voltage source, oscillation circuit, error amplifier, and an internal NMOS. 1 8 EN GND AP5004 provides low-ripple power, high efficiency, and FB 2 7 GND excellent transient characteristics. The PWM control circuit is AP5004 3 6 Vboost Vcc able to vary the duty ratio linearly from 0% up to 90%. An Output 4 5 Vcc enable function, an over-current protect function, and a short circuit protect function are built inside, and when OCP or SCP happens, the operation frequency will be reduced from SOP-8L 300 KHz to 50 KHz. Also, an internal compensation block has been designed in to minimize the external component count. Applications With built-in power NMOS, a step-down switching regulator can easily be built by adding a coil, capacitors, and a diode. Microprocessor Core Supply Networking Power Supply The combination of high efficiency, low standby current, high LCD MNT, TV Power Supply input voltage (32V), and high output current (2.5A)in a small Telecom Power Supply SOP-8L package gives the AP5004 an unprecedented advantage in any high power system applications. Features Input Voltage: 10V to 32V Adjustable Output Voltage from 0.8V to 6V Duty Ratio: 0% to 90% PWM control Oscillation Frequency: 300KHz typical Short Circuit Protect Frequency:50 KHz 2uA Maximum Standby Current Current Limit, Enable Function Thermal Shutdown Function Built-in Internal SW N-channel MOS SOP-8L: Available in Green Molding Compound (No Br, Sb) Lead Free Finish/ RoHS Compliant (Note 1) Notes: 1. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied. Please visit our website at AP5004 PWM CONTROL 2.5A STEP-DOWN CONVERTER Typical Application Circuit C7 0.1uF U1 VOUT = 5V L1-(WURTH 744132) 33uH 3 4 1 2 VIN Vboost Output 5 2 VCC FB C1 R1 AP5004 685ohm 100pF 6 7 VCC GND R5 C4 C5 D1 100K 1 8 GND EN B340 0.1uF 470uF/16V R2 130ohm C2 C3 220uF/63V 0.1uF C6 0.1uF x (1+R1/R2) Note : V = V OUT FB R = 100 ~ 300 ohm B Notes: 2. Suggested DIODES Power Schottky P/N: PDS540 or B540C. Pin Descriptions Pin Name Pin Description H: Normal operation EN 1 L: Step-down operation stopped FB 2 Feedback pin V 3 High-side gate driver boost pin boost Output 4 Switch output pin 56 V V CC CC 78 GND GND pin 2 of 11 August 2010 AP5004 Diodes Incorporated www.diodes.com Document number: DS31444 Rev. 5 - 2