AP5100WG-7 Diodes Incorporated

AP5100 1.2A STEP-DOWN CONVERTER with 1.4MHz SWITCHING FREQUENCY Description Pin Assignments The AP5100 is a current mode step-down converter with a ( Top View ) built-in power MOSFET to enable smallest solution size power conversion. 1 BST 6 SW With the low series resistance power switch it enables a constant output current of up to 1.2A over a wide input supply 2 5 IN GND range. The load and line regulation has excellent response time over the operating input voltage and temperature range. 3 74 EN FB The AP5100 is self protected, through a cycle-by-cycle current limiting algorithm and an on chip thermal protection. SOT26 The AP5100 will provide the voltage conversion with a low count of widely available standard external components. The AP5100 is available in SOT26 package. Features Applications V 4.75V to 24V IN Distributed Power Systems Load current of up to 1.2A Battery Charger Internal Power MOSFET Pre-Regulator for Linear Regulators Stable with Low ESR Ceramic Output Capacitors WLED Drivers Up to 90% Efficiency 0.1A Shutdown Mode Fixed 1.4MHz Frequency Thermal Shutdown Cycle-by-Cycle Over Current Protection Resistor divider adjustable Output: 0.81V to 15V SOT26: 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 AP5100 1.2A STEP-DOWN CONVERTER with 1.4MHz SWITCHING FREQUENCY Typical Application Circuit (cont.) 5 1 V IN BST IN C3 L1 C1 22nF 10F 3.3H V 6 OUT R3 25V SW AP5100 3.3V 100kohm D1 R1 C6 B230A 49.9kohm 100pF C2 4 3 OFF ON EN GND FB 22F R2 6.3V 16.2kohm Figure 3. 1.4MHz, 3.3V Output at 1A Step-Down Converter 5 1 IN BST V IN C3 L1 6V -12V C1 10nF 10H D1 6 R3 10F AP5100 SW C2 25V 100Kohm 1N5819HW-7 LED1 10F - Vout -Vout 16V LED 2 4 3 ON OFF EN GND FB R2 R4 LED 3 40 ohm 200Kohm - Vout 1% 1% -Vout Figure 4. White LED Driver Application 2 of 12 April 2012 AP5100 Diodes Incorporated www.diodes.com Document number: DS32130 Rev. 3 - 2