AP1534 Datasheet, PDF (1/8 Pages) Diodes Incorporated – PWM CONTROL 2A STEP-DOWN CONVERTER

AP1534
PWM CONTROL 2A STEP-DOWN CONVERTER
Features
General Description
• Input voltage: 4.4V to 18V
• Output voltage: 0.8V to VCC.
• Duty ratio: 0% to 99% PWM control
• Oscillation frequency: 300KHz typ.
• Current limit, Enable function
• Thermal Shutdown function
• Built-in internal SW P-channel MOS
• SOP-8L: Available in “Green” Molding Compound
(no Br, Sb)
• Lead Free Finish/RoHS Compliant (Note 1)
AP1534 consists of step-down switching regulator with PWM
control. These devices include a reference voltage source,
oscillation circuit, error amplifier, internal PMOS.
AP1534 provides low-ripple power, high efficiency, and excellent
transient characteristics. The PWM control circuit is able to vary
the duty ratio linearly from 0 up to 99%. This converter also
contains an error amplifier circuit as well as a soft-start circuit that
prevents overshoot at startup. An enable function, an over
current protect function and a short circuit protect function are built
inside, and when OCP or SCP happens, the operation frequency
will be reduced from 300KHz to 50KHz. Also, an internal
compensation block is built in to minimize external component
count.
With the addition of an internal P-channel Power MOS, a coil,
capacitors, and a diode connected externally, these ICs can
function as step-down switching regulators. They serve as ideal
power supply units for portable devices when coupled with the
SOP-8L mini-packages, providing such outstanding features as
low current consumption. Since this converter can accommodate
an input voltage up to 18V, it is also suitable for the operation via
an AC adapter.
Applications
• PC Motherboard
• LCD Monitor
• Graphic Card
• DVD-Video Player
• Telecom Equipment
• ADSL Modem
• Printer and other Peripheral Equipment
• Microprocessor Core Supply
Ordering Information
AP1534 X X X
Package
Lead Free
Packing
S : SOP-8L
G : Green
-U : Tube
-13 : Tape & Reel
Note: 1. RoHS revision 13.2.2003. Glass and High Temperature Solder Exemptions Applied, see EU Directive Annex Notes 5 and 7.
Device
Package
Code
AP1534S
S
Packaging
(Note 2)
SOP-8L
Tube
Quantity ^{Part Number}
Suffix
100
-U
13” Tape and Reel
Quantity
Part Number
Suffix
2500/Tape & Reel
-13
Note: 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.
AP1534 Rev. 2
1 of 8
www.diodes.com
DECEMBER 2007
© Diodes Incorporated