Diodes AP5002 User Manual
AP5002
PWM CONTROL 2A STEP-DOWN CONVERTER
Features
• Input voltage: 3.6V to 20V
• Output voltage: 0.8V to V
• Duty ratio: up to 100% PWM control
• Oscillation frequency: 500KHz typical
• Soft-start Current Limit, Enable function
• Thermal Shutdown function
• Built-in internal SW P-channel MOS
• Low ESR output capacitor (MLCC, multi-layer ceramic
capacitor) support
• Efficiency 90%
• SOP-8L: Available in “Green” Molding Compound
(No Br, Sb)
• Lead Free Finish / RoHS Compliant (Note 1)
CC
Applications
• PC Motherboard
• LCD Monitor
• Graphic Card
• DVD-Video Player
• Telecom Equipment
• ADSL Modem
• Printer and other Peripheral Equipment
• Microprocessor core supply
• Networking power supply
General Description
AP5002 consists of step-down switching regulator with
PWM control. These devices include a reference voltage source,
oscillation circuit, error amplifier, internal PMOS.
AP5002 provides low-ripple power, high efficiency, and excellent
transient characteristics. The PWM control circuit is able to vary
the duty ratio linearly up to 100%. 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 500KHz to 50KHz. Also, an internal compensation
block is built in to minimum 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-package, providing such outstanding features as
low current consumption. Since this converter can accommodate
an input voltage up to 22V, it is also suitable for the operation via
an AC adapter.
Ordering Information
AP5002 S G - 13
Package
S : SOP-8L
Device
AP5002SG-13 S SOP-8L 2500/Tape & Reel -13
Notes: 1. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied. Please visit our website at
http://www.diodes.com/products/lead_free.html
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
AP5002 Rev. 8 1 of 10 FEBRUARY 2009
Package
Code
Packaging
(Note 2)
.
.
www.diodes.com © Diodes Incorporated
Green
G : Green
Packing
13 : Tape & Reel
13” Tape and Reel
Quantity Part Number Suffix
(
AP5002
PWM CONTROL 2A STEP-DOWN CONVERTER
Pin Assignments
( Top View )
1
FB
2
EN
Comp
CC
V
AP5002
3
4
SOP-8L
Block Diagram
Vcc
8
7
6
5
Vss
Vss
Output
Output
Output
Pin Descriptions
Name Pin Description
FB 1 Feedback pin
Power-off pin
H: Normal operation
EN 2
Comp 3 Compensation pin
VCC 4 IC power supply pin
Output
VSS
Oscillation
Circuit
(Step-down operation)
L: Step-down operation stopped
All circuits deactivated)
Switch Pin. Connect external
5、6
inductor/diode here. Minimize trace
area at this pin to reduce EMI.
7、8
GND Pin
Reference Voltage Source
+
FB
-
Vss
Thermal
Shutdown
EN
PWM-Switched
Control Circuit
V
EN
100uA
Comp
AP5002 Rev. 8 2 of 10 FEBRUARY 2009
www.diodes.com © Diodes Incorporated
AP5002
PWM CONTROL 2A STEP-DOWN CONVERTER
Absolute Maximum Ratings
Symbol Parameter Rating Unit
ESD HBM Human Body Model ES D Protection
5
ESD MM Machine Model ESD Protection 200 V
VCC VCC Pin Voltage VSS - 0.3 to VSS + 22 V
VFB Feedback Pin Voltage VSS - 0.3 to VCC V
VEN EN Pin Voltage VSS - 0.3 to VIN V
V
Switch Pin Voltage VSS- 0.3 to VIN V
OUTPUT
PD Power Dissipation 1000 mW
TJ Operating Junction Temperature Range -20 to +125
T
Storage Temperature Range -65 to +150
ST
Caution: The absolute maximum ratings are rated values exceeding which the product could suffer physical damage. These values must therefore not be
exceeded under any conditions.
Recommended Operating Conditions
Symbol Parameter Min Max Unit
VIN Input Voltage 3.6 20 V
I
Output Current 0 2 A
OUT
TA Operating Ambient Temperature -20 85 oC
AP5002 Rev. 8 3 of 10 FEBRUARY 2009
www.diodes.com © Diodes Incorporated
KV
o
C
o
C
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