AP1509
150kHz, 2A PWM BUCK DC-DC CONVERTER
Description
Pin Assignments
The AP1509 series are monolithic ICs designed for a step-down
DC-DC converter and have the ability of driving a 2A load without an
additional transistor, which saves board space.
(Top View)
The external shutdown function can be controlled by logic level and
VIN
1
Output
2
8
GND
7
GND
then go into standby mode. The internal compensation makes
feedback control have good line and load regulation without external
AP1509
design. Regarding protected function, thermal shutdown prevents
FB
3
6
GND
SD
4
5
GND
overtemperature operating from damage, and current limit works
against overcurrent operating of the output switch. If current limit
function occurs, and VFB is below 0.5V, the switching frequency is
SOP-8L
reduced. The AP1509 series operates at a switching frequency of
150kHz thus allowing smaller-sized filter components than what is
required 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 chips are available in a
standard 8-lead SO-8 package.
Features
Applications
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Output Voltage: 3.3V, 5V, 12V, and Adjustable Output Version
Adjustable Version Output Voltage Range of 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 up to 22V
Output Load Current: 2A
Low Power Standby Mode
Built-in Switching Transistor On Chip
Totally Lead-Free & Fully RoHS Compliant (Note 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
For automotive applications requiring specific change
control (i.e. parts qualified to AEC-Q100/101/200, PPAP
capable, and manufactured in IATF 16949 certified facilities),
please contact us or your local Diodes representative.
https://www.diodes.com/quality/product-definitions/
Notes:
Simple High-Efficiency Step-Down Regulator
On-Card Switching Regulators
Positive to Negative Converter
1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS), 2011/65/EU (RoHS 2) & 2015/863/EU (RoHS 3) compliant.
2. See https://www.diodes.com/quality/lead-free/ for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green" and
Lead-free.
3. Halogen- and Antimony-free "Green” products are defined as those which contain
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