Buck converter AP1501
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AP1501 150KHz, 3A PWM BUCK DC/DC CONVERTER General Description The AP1501 is a fully integrated step-down DC/DC converter, with the ability to drive 3A load without the need of additional driver components. The AP1501 operates at a switching frequency of 150KHZ enabling the use of small size filter components. As a result, board space is reduced and BOM costs are lowered. Output voltage: 3.3V, 5V, 12V and adjustable output version Adjustable version output voltage range, 1.23V to 37V+4% 150KHZ +15% fixed switching frequency Voltage mode non-synchronous PWM control Thermal-shutdown and current-limit protection ON/OFF shutdown control input Operating voltage can be up to 40V Output load current: 3A Low power standby mode Built-in switching transistor on chip Lead Free packages: TO263-5L and TO220-5L(R) TO263-5L and TO220-5L(R): Available in “Green” Molding Compound (No Br, Sb) Lead Free Finish/RoHS Compliant (Note 1) The AP1501 has integrated the shutdown function that allows standby mode to be activated via an external logic signal input. The internal compensation facilitates feedback control for line and load regulation without the need of an external circuitry. The AP1501 has a built-in Thermal shutdown and Current Limit function to prevent damage from high operating temperature and high current operating to the output switch. Additional features include a guaranteed +/- 4% tolerance on the output voltage under specified input and output load conditions, and +/- 15% on oscillator frequency. The AP1501 offers both fixed and a Adjustable output voltages. For fixed outputs the AP1501 supports 3.3V, 5.0V and 12V. The package options available are standard 5-lead TO263 and TO220(R) packages. Simple High-efficiency step-down regulator On-card switching regulators Positive to negative converter Ordering Information AP1501 - XX XXX X - X Output version Lead Free L : Lead Free G : Green U : Tube 13 : Tape & Reel Device Lead-free Package Code Tube Part Number Suffix 13” Tape and Reel Quantity Part Number Suffix NA 800/Tape & Reel NA 800/Tape & Reel NA NA NA NA 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 http://www.diodes.com/datasheets/ap02001.pdf..

AP1501 150KHz, 3A PWM BUCK DC/DC CONVERTER ( Top View ) 5 SD 4 FB 3 Gnd 2 Output 1 VIN Metal Tab GND Description Operating voltage input Switching output Ground Output voltage feedback control ON/OFF shutdown

AP1501 150KHz, 3A PWM BUCK DC/DC CONVERTER VIN 200mV Current Source bias Frequency compensation Thermal Shutdown Absolute Maximum Ratings Symbol Machine Model ESD Protection Supply Voltage ON/OFF Pin input Voltage Output Voltage to Ground Power Dissipation Internally limited Storage Temperature Operating Junction Temperature Maximum Junction Temperature

AP1501 150KHz, 3A PWM BUCK DC/DC CONVERTER Recommended Operating Conditions Symbol Operating Voltage Operating Ambient Temperature Electrical Characteristics (All Output Voltage Versions) Unless otherwise specified, VIN = 12V for 3.3V, 5V, adjustable version and VIN = 24V for the 12V version. ILOAD = 0.5A Specifications with boldface type are for full operating temperature range, the other type are for TJ = 25ºC. Conditions VFB = 1.3V Feedback Bias Current (Adjustable version only) Saturation Voltage Max. Duty Cycle(ON) Min. Duty cycle(OFF) Current Limit Output Leakage Output = -1 Current...

AP1501 150KHz, 3A PWM BUCK DC/DC CONVERTER Electrical Characteristics Specifications with boldface type are for full operating temperature range, the other type are for TJ = 25ºC. Output Feedback 4.5V < VIN < 40V 1.193 0.2A < ILOAD < 3A 1.18 VOUT programmed for 3V Output Voltage Output Voltage Output Voltage

AP1501 150KHZ, 3A PWM BUCK DC/DC CONVERTER Typical Performance Characteristics Typical Performance Characteristics Normalized Output Voltage Switch Saturation Voltage Switch Current Limit SWITCH CURRENT LIMIT (A) SWITCH CURRENT(A) Shutdown Quiescent Current Operating Quiescent Current 200.0

AP1501 150KHz, 3A PWM BUCK DC/DC CONVERTER Typical Performance Characteristics ON/OFF Threshold Voltage Minimum Operating Supply Voltage 5.0 THRESHOLD VOLTAGE (V) ON/OFF Pin Current (Sinking) Feedback Pin Bias Current

AP1501 150KHz, 3A PWM BUCK DC/DC CONVERTER Typical Application Circuit (1) Fixed Type Circuit FB 12V DC Input (2) Adjustable Type Circuit R1 VFB = 1.23V R2 = 1K ~ 3K (3) Delay Start Circuit R2 5. Suggested DIODES Power Schottky: B340A or PDS340 series.

AP1501 150KHz, 3A PWM BUCK DC/DC CONVERTER Functional Description Pin Functions +VIN This is the positive input supply for the IC switching regulator. A suitable input bypass capacitor must be present at this pin to minimize voltage transients and to supply the switching currents needed by the regulator. Ground Circuit ground. Output Internal switch. The voltage at this pin switches between (+VIN – VSAT) and approximately – 0.5V, with a duty cycle of approximately VOUT / VIN. To minimize coupling to sensitive circuitry, the PC board copper area connected to this pin should be kept a...

AP1501 150KHz, 3A PWM BUCK DC/DC CONVERTER L : Lead Free G : Green ID code Xth week : 01~52 Year : "07" = 2007 "08" = 2008 L : Lead Free G : Green ID code Xth week : 01~52 Year : "07" = 2007 "08" = 2008

AP1501 150KHz, 3A PWM BUCK DC/DC CONVERTER Package Information (1) Package Type: TO263-5L

AP1501 150KHz, 3A PWM BUCK DC/DC CONVERTER Package Information (3) Package Type: TO220-5L(R) Mechanical drawing IMPORTANT NOTICE Diodes Incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other changes without further notice to any product herein. Diodes Incorporated does not assume any liability arising out of the application or use of any product described herein; neither does it convey any license under its patent rights, nor the rights of others. The user of products in such applications shall assume all risks of such use...