Diodes AP1506 User Manual
Ap1506
AP1506
150KHz, 3A PWM BUCK DC/DC CONVERTER
AP1506
Document number: DS31015 Rev. 7 - 2
1 of 14
June 2010
© Diodes Incorporated
Description
The AP1506 series are monolithic IC designed for a step-
down DC/DC converter, and own the ability of driving a 3A
load without external transistor. Due to reducing the number
of external components, the board space can be saved easily.
The external shutdown function can be controlled by logic
level and then come into standby mode. The internal
compensation makes feedback control have good line and
load regulation without external design. Regarding protected
function, thermal shutdown is to prevent over temperature
operating from damage, and current limit is to prevent over
current operating of the output switch. If current limit function
occurred and V
FB
is down to 0.5V below, the switching
frequency will be reduced. The AP1506 series operate at a
switching frequency of 150KHz thus allowing smaller sized
filter components than what would be needed with lower
frequency switching regulators. Other features include a
guaranteed +4% tolerance on output voltage under specified
input voltage and output load conditions, and +15% on the
oscillator frequency. The output version included fixed 3.3V,
5V, 12V, and an adjustable type. The packages are available
in a standard 5-lead TO263 and TO220.
Features
• Output Voltage: 3.3V, 5V, 12V and Adjustable Output
Version
• Adjustable Version Output Voltage Range, 1.23V to
18V+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 22V
• Output Load Current: 3A
• Lead Free packages: TO263-5L and TO220-5L(R)
• TO263-5L and TO220-5L(R): Available in “Green”
Molding Compound (No Br, Sb)
• Low Power standby mode
• Built-in Switching Transistor On Chip
• Lead Free Finish/RoHS Compliant (Note 1)
Pin Assignments
( Top View )
1 V
IN
5 SD
4 FB
3 Gnd
2 Output
Metal Tab GND
TO263-5L
1 V
IN
5 SD
4 FB
3 Gnd
2 Output
( Top View )
TO220-5L/TO220-5L(R)
Applications
• Simple High-Efficiency Step-Down Regulator
• On-Card Switching Regulators
• Positive to Negative Converter
Notes: 1. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied. Please visit our website at