AP1510
PWM CONTROL 3A STEP-DOWN CONVERTER
Features
•
•
•
•
•
•
•
•
•
Input voltage: 3.6V to 23V
Output voltage: 0.8V to V
CC
Duty ratio: 0% to 100% PWM control
Oscillation frequency: 300KHz typ.
Soft-start, Current Limit, Enable function
Thermal Shutdown function
Built-in internal SW P-channel MOS
SOP-8L
Pb-Free
Package
Lead Free Finish/RoHS Compliant (Note 1)
General Description
AP1510 consists of step-down switching regulator with PWM control.
These devices include a reference voltage source, oscillation circuit,
error amplifier, and internal PMOS.
AP1510 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 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 300KHz to 30KHz. 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 23V, it is also suitable for the operation via an AC
adapter.
Applications
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•
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Cellular Phones
PC Motherboard
LCD Monitor
Graphic Card
DVD-Video Player
Telecom Equipment
ADSL Modem
Printer and other Peripheral Equipment
Microprocessor core supply
Networking power supply
Ordering Information
A P 1 5 10 X X X
Package
S : SOP-8L
Lead-Free
L : Lead-Free
Packing
-U : Tube
-13 : Taping
Note:
1. RoHS revision 13.2.2003. Glass and High Temperature Solder Exemptions Applied, see
EU Directive Annex Notes 5 and 7.
Device
(Note 2)
AP1510S
Lead-free
Package
Code
S
Packaging
SOP-8L
Tube
Part Number
Quantity
Suffix
100
-U
13” Tape and Reel
Part Number
Quantity
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.
AP1510 Rev. 1
1 of 8
www.diodes.com
JANUARY 2007
©
Diodes Incorporated
AP1510
PWM CONTROL 3A STEP-DOWN CONVERTER
Absolute Maximum Ratings
Symbol
V
CC
V
FB
V
EN
V
OUT
P
D
T
OPR
T
STG
Caution:
Parameter
V
CC
Pin Voltage
Feedback Pin Voltage
EN Pin Voltage
Switch Pin Voltage
Power Dissipation
Operating Temperature Range
Storage Temperature Range
Rating
V
SS
- 0.3 to V
SS
+ 25
V
SS
- 0.3 to V
CC
V
SS
- 0.3 to V
IN
+ 0.3
V
SS
- 0.3 to V
IN
+ 0.3
Internally limited
-20 to +125
-40 to +150
Unit
V
V
V
V
mW
o
C
o
C
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.
Electrical Characteristics
( V
IN
= 12V, T
a
= 25
°C
, unless otherwise specified )
Symbol
V
IN
V
FB
I
FB
I
SW
I
SSS
Parameter
Input Voltage
Feedback Voltage
Feedback Bias Current
Switch Current
Current Consumption
During Power Off
Conditions
--
I
OUT
= 0.1A
I
OUT
= 0.1A
--
V
EN
= 0V
V
IN
= 5V~23V, I
OUT
= 0.2A
I
OUT
= 0.1 to 3A
Measure waveform at SW pin
Measure waveform at SW pin
Evaluate oscillation at SW pin
Evaluate oscillation stop at SW pin
--
--
--
--
V
IN
= 5V, V
FB
= 0V
V
IN
=12V, V
FB
= 0V
V
IN
= 12V, V
OUT
= 5V
I
OUT
= 3A
Min.
3.6
0.784
-
3.5
-
-
-
240
10
2.0
-
-
-
75
0.3
-
-
-
-
Typ.
-
0.8
0.1
-
10
1
0.2
300
-
-
-
20
-10
90
2
110
70
91
65
Max.
23
0.816
0.5
-
-
2
0.5
360
-
-
0.8
-
-
105
5
150
100
-
-
o
Unit
V
V
µA
A
µA
%
%
KHz
KHz
V
µA
µA
µA
ms
mΩ
%
C/W
∆V
OUT
Line Regulation
/V
OUT
∆V
OUT
Load Regulation
/V
OUT
f
OSC
Oscillation Frequency
Frequency of Current Limit
f
OSC1
or Short Circuit Protect
V
SH
EN Pin Input Voltage
V
SL
I
SH
EN Pin Input Leakage
Current
I
SL
I
OCSET
OCSET Pin Bias Current
T
SS
Soft-Start Time
R
DSON
Internal MOSFET Rdson
EFFI
θ
JA
Efficiency
Thermal Resistance
Junction-to-Ambient
AP1510 Rev. 1
3 of 8
www.diodes.com
JANUARY 2007
©
Diodes Incorporated
AP1510
PWM CONTROL 3A STEP-DOWN CONVERTER
Typical Application Circuit
V
OUT
=5V/3A
R
A
6.8K
V
IN
R
OCSET
C
OCSET
3.9K
Option
C
IN
470uF
CVcc
0.1uF
R
EN
100K
C
EN
0.1uF
Vcc
Output
L1
22uH
C
C
Optional
AP1510
OCSET
EN
V
SS
FB
+
C
+
C
OUT
470uF
-
-
0.1uF
D1
R
B
1.3K
Note: V
OUT
= V
FB
x (1+R
A
/R
B
)
R
B
=0.7K~5K ohm
Figure 1.
V
IN
=12V, I
MAX
=3A
2.5V
3.3V
15uH
18uH
5V
22uH
V
OUT
L1 Value
Function Description
PWM Control
The AP1510 consists of DC/DC converters that employ a
pulse-width modulation (PWM) system.
In converters of the AP1510, the pulse width varies in a range
from 0 to 100%, according to the load current. The ripple voltage
produced by the switching can easily be removed through a filter
because the switching frequency remains constant. Therefore,
these converters provide a low-ripple power over broad ranges of
input voltage and load current.
Under Voltage Lockout
The under voltage lockout circuit of the AP1510 assures that the
high-side MOSFET driver outputs remain in the off state
whenever the supply voltage drops below 3.3V. Normal operation
resumes once V
CC
rises above 3.5V.
R
DS(ON)
Current Limiting
The current limit threshold is setting by the external resistor
connecting from V
CC
supply to OCSET. The internal 100uA sink
current crossing the resistor sets the voltage at pin of OCSET.
When the PWM voltage is less than the voltage at OCSET, an
over-current condition is triggered.
I
LOAD
×
R
DS(ON)
=
I
OCSET
×
R
OCSET
See above formula for setting the current limit value.
AP1510 Rev. 1
4 of 8
www.diodes.com
JANUARY 2007
©
Diodes Incorporated
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