AP1512A-33K5L-13 Diodes Incorporated

AP1512/A 50KHz, 2A/3A PWM BUCK DC/DC CONVERTER General Description Features Output voltage: 3.3V, 5V, 12V and adjustable output The AP1512/A is a monolithic IC designed for use as a version step-down DC/DC converter with the ability of driving a 2A (3A for AP1512A) load without additional transistor components. The Adjustable version output voltage range, 1.23V to board space is reduced since AP1512/A requires few external 37V+4% components. The external shutdown function is controlled by 50KHz +15% fixed switching frequency logic level and can be put into standby mode. The internal Voltage mode non-synchronous PWM control compensation ensures feedback control has good line and load Thermal-shutdown and current-limit protection regulation without external design. Both an integrated Thermal ON/OFF shutdown control input shutdown and Current Limit function are provided to prevent Operating voltage can be up to 60V damage from exceeding temperature operation and against Output load current: 2A (for AP1512) exceeding the current operating of the output switch. The 3A (for AP1512A) AP1512/A operates at a switching frequency of 50KHz thus Low power standby mode allowing smaller sized filter components than what would be Built-in switching transistor on chip needed with lower frequency switching regulators. Other features Lead Free Finish/ RoHS Compliant (Note 1) include a guaranteed +4% tolerance on output voltage under specified input voltage and output load conditions, and +15% tolerance on the oscillator frequency. The AP1512/A offers fixed output voltages of 3.3V, 5V, 12V, plus Adjustable. The package is available in a standard 5-lead TO263 package. Applications Simple High-efficiency step-down regulator On-card switching regulators Positive to negative converter Ordering Information AP1512 X - XX XX X X Output Version Package Lead Free Packing Part Number L : Lead Free Blank : Adjustable K5 : TO263-5L Blank : 2A -U : Tube A : 3A 33 : 3.3V -13 : Tape & Reel 50 : 5.0V 12 : 12V Tube 13 Tape and Reel Package Packaging Device Part Number Part Number Code (Note 2) Quantity Quantity Suffix Suffix Lead-free AP1512X-XXK5 K5 TO263-5L 50 -U 800/Tape & Reel -13 Notes: 1. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied, see EU Directive 2002/95/EC Annex Notes. 2. Pad layout as shown on Diodes Inc. suggested pad layout document AP02001, which can be found on our website at AP1512/A 50KHz, 2A/3A PWM BUCK DC/DC CONVERTER Pin Descriptions Pin Assignments ( Top View ) Name Description V Operating voltage input 5 SD IN 4 FB Output Switching output 3 GND GND Ground 2 Output 1 V FB Output voltage feedback control IN Metal Tab GND SD ON/OFF Shutdown TO263-5L Block Diagram SD V IN 200mV 220mV Current 2.5V 1.235V Start Source up Regulator Reference bias + Comp Comp + Frequecy + 2A compen- Amp Switch Comp Pre-driver FB sation + (3A for AP1512A) Output 50KHz Thermal OSC. Limit Gnd AP1512/A Rev. 4 2 of 12 MAY 2008 www.diodes.com Diodes Incorporated