Diodes AP2014-A User Manual
AP2014/A
SYNCHRON O US PWM CONTROLL E R
Features
• Synchronous Controller in 8-Pin Package
• Operating with single 5V or 12V supply voltage
• Internal 200KHz Oscillator (400KHz for AP2014A)
• Soft-Start Function
• Fixed Frequency Voltage Mode
• 500mA Peak Output Drive Capability
• Protects the output when control FET is shorted
• Lead Free Package SOP-8L
• SOP-8L: Available in “Green” Molding Compound
(No Br, Sb)
• Lead Free Finish/ RoHS Compliant (Note 1)
Applications
• Graphic Card
• Hard Disk Drive
• DDR memory source sink Vtt application
• Low cost on-board DC to DC such as 5V to 3.3V, 2.5V or 1.8V
Ordering Information
AP 2014/A S X - 13
General Description
The AP2014 controller IC is designed to provide a low cost
synchronous Buck regulator for on-board DC to DC converter
applications. With today’s ASIC products requiring supply voltages
at 1.8V and lower, when the output current is as much as 3A and
the input voltage is at either 3.3V or 5V, traditional linear regulator
simply incurs too much loss within itself. The AP2014 together with
dual N-channel MOSFETs provide a low cost solution for such
applications. This device features an internal 200KHz oscillator
(400KHz for "A" version), under-voltage lockout for both Vcc and
Vc supplies, an external programmable soft-start function as well
as output under-voltage detection that latches off the device when
an output short is detected.
Package PackingLead Free
S : SOP-8L
L : Lead Free
G : Green
13 : Tape & Reel
Device
AP2014SL-13 S SOP-8L 2500/Tape & Reel -13
Lead-free
Package
Code
Packaging
(Note 2)
Quantity Part Number Suffix
AP2014SG-13 S SOP-8L 2500/Tape & Reel -13
AP2014ASL-13 S SOP-8L 2500/Tape & Reel -13
Lead-free
AP2014ASG-13 S SOP-8L 2500/Tape & Reel -13
Notes: 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
.
13” Tape and Reel
AP2014/A Rev. 5 1 of 14 FEBRUARY 2009
www.diodes.com © Diodes Incorporated
Pin Assignment
( Top View )
AP2014/A
SYNCHRON O US PWM CONTROLL E R
1
FB
VCC
LDrv
GND
2
3
4
SOP-8L
8
7
6
5
SS
Comp
Vc
HDrv
Pin Descriptions
Pin Name Pin No. Description
FB 1
Vcc 2
LDrv 3 Output driver for the s ynchronous power MOSFET.
GND 4
HDrv 5 Output driv er for the high side power MOS F ET.
Vc 6
Comp 7
SS 8
This pin is connected directly to the output of the switching regulator via resistor
divider to provide feedback to the Error amplifier.
This pin provides biasing for the internal blocks of the IC as well as power for the
low side driver. A minimum of 1uF, high frequency capacitor must be connected
from this pin to ground to provide peak drive current capability.
This pin serves as the ground pin and must be connected directly to the ground
plane. A high frequency capacitor (0.1 to 1u F) must be connecte d from V5 and
V12 pins to this pin for noise free operation.
This pin is connected to a voltage that must be at least 4V higher than the bus
voltage of the switcher (assuming 5V threshold MOSFET) and powers the high
side output driver. A minimum of 1uF, high frequency capacitor must be
connected from this pin to ground to provide peak drive current capability.
Compensation pin of the error amplifier. An external resistor and capacitor
network is typically connected from this pin to ground to provide loop
compensation.
This pin provides soft-start for the switching regulator. An internal current source
charges an external capacitor that is connected from this pin to ground which
ramps up the output of the switching regulator, preventing it from overshooting as
well as limi ting the inpu t current. T he converter c an be shutdown by pulling thi s
pin below 0.5V.
AP2014/A Rev. 5 2 of 14 FEBRUARY 2009
www.diodes.com © Diodes Incorporated
Block Diagram
3V
AP2014/A
SYNCHRON O US PWM CONTROLL E R
Vc
6
Comp
SS
Fb
Ct
0.2V
+
-
0.2V
+
-
FbLo Comp
-
+
Oscillator
Error Comp
+
-
POR
Bias
Generator
S
Q
R
Reset Dom
3V
1.25V
POR
4
GND
HDrv
5
2
Vcc
3
LDrv
20uA
8
POR
1.25V
1
7
64uA
Max
25K
25K
0.5V
Error Amp
+
-
Vcc
4.0V
Vc
3.5V
AP2014/A Rev. 5 3 of 14 FEBRUARY 2009
www.diodes.com © Diodes Incorporated
T ypical Application Circuit
(1)
R3
8.2
C5
0.47u
1
2
3
45
C4
0.1u
U1
FB
SS
Vcc
Comp
LDrv
GND HDrv
Vc
AP2014
8
7
6
C6
10nF
22k
R6
Vc=12V
C20
100p
AP2014/A
SYNCHRON O US PWM CONTROLL E R
VIN=5V
C3
1u
Q1
Q2
C8
470u
L1
5.6u/9.0
C11
0.1u
R1
820
R2
3.3K
C12
470u
Vout +1.5V/7.0A
C13
470u
C17
0.1u
(2)
D2
1N4148
C3
100u
C5
0.47u
R3
8.2
D1
1N4148
C4
0.1u
U1
1
FB
Vcc
LDrv
GND
SS
Comp
Vc
HDrv
2
3
4 5
AP2014
8
7
6
C6
10nF
R6
6.8k
C1
0.1uF
C20
100p
Option
Q1
Q2
C8
470u
L1
5.6u/9A
VIN=12V
C11
0.1u
R1
820
R2
3.3K
C12
470u
Vout +1.5V/7.0A
C13
C17
470u
0.1u
Single Supply 12V Input
AP2014/A Rev. 5 4 of 14 FEBRUARY 2009
www.diodes.com © Diodes Incorporated
T ypical Application Circuit (Continued)
(3)
D2
1N4148
D1
1N4148
C1
0.1uF
AP2014/A
SYNCHRON O US PWM CONTROLL E R
VIN=12V
C8
C11
470u
0.1u
(4)
C3
100u
C5
0.47u
D2
1N4148
R3
8.2
R3
8.2
C4
0.1u
U1
1
FB
Vcc
LDrv
GND
RZD
1.2K
SS
Comp
Vc
HDrv
1N4148
C4
0.1u
2
3
4 5
AP2014
8
7
6
C6
10nF
R6
39k
C20
100p
Single Supply 12V Input
D1
C1
0.1uF
Q1
Q2
L1
10uH/6A
C8
470u
R1
10K
R2
3K
VIN=24V
C11
0.1u
R1
10K
Vout +5V/5.0A
C13
470u
C17
0.1u
U1
ZD
6.2V
C3
100u
R3
8.2
C5
0.47u
1
FB
2
Vcc
3
LDrv
4 5
GND
AP2014
SS
Comp
Vc
HDrv
8
7
6
C6
10nF
R6
47k
C20
100p
Q1-1
Q1-2
L1
10uH/6A
R2
3.3K
Vout +5V/4.0A
C13
C17
0.1u
470u
IZD(≧15mA)=(VIN-VD2-VZD)/RZD
Single Supply 24V Input
AP2014/A Rev. 5 5 of 14 FEBRUARY 2009
www.diodes.com © Diodes Incorporated
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