DIODES AP1510

AP1510
PWM CONTROL 3A STEP-DOWN CONVERTER
General Description
Features
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AP1510 consists of step-down switching regulator with PWM control.
These devices include a reference voltage source, oscillation circuit,
error amplifier, and internal PMOS.
Input voltage: 3.6V to 23V
Output voltage: 0.8V to VCC
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)
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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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
Lead-Free
S : SOP-8L
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)
Package
Code
Packaging
AP1510S
S
SOP-8L
Tube
Part Number
Quantity
Suffix
100
-U
13” Tape and Reel
Part Number
Quantity
Suffix
2500/Tape & Reel
Lead-free
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
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JANUARY 2007
© Diodes Incorporated
-13
AP1510
PWM CONTROL 3A STEP-DOWN CONVERTER
Pin Descriptions
Pin Assignments
8
Vss
7
Vss
OCSET 3
6
Output
VCC 4
5
Output
FB 1
EN 2
Name
FB
EN
AP1510
OCSET
VCC
Output
VSS
Pin
Description
1 Feedback pin.
Power-off pin
H: Normal operation
2
(Step-down operation)
L: Step-down operation stopped
(All circuits deactivated)
Add an external resistor to set
3
max output current.
4 IC power supply pin
Switch Pin. Connect external
inductor/diode here. Minimize
5, 6
trace area at this pin to reduce
EMI.
7, 8 GND Pin
Block Diagram
Output
Oscillation
Circuit
Reference Voltage
Source with Soft Start
Vcc
+
PWM-Switched
Control Circuit
FB
-
Thermal
Shutdown
VEN
EN
AP1510 Rev. 1
2 of 8
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100uA
Vss
OCSET
JANUARY 2007
© Diodes Incorporated
AP1510
PWM CONTROL 3A STEP-DOWN CONVERTER
Absolute Maximum Ratings
Symbol
VCC
VFB
VEN
VOUT
PD
TOPR
TSTG
Caution:
Parameter
VCC Pin Voltage
Feedback Pin Voltage
EN Pin Voltage
Switch Pin Voltage
Power Dissipation
Operating Temperature Range
Storage Temperature Range
Rating
VSS - 0.3 to VSS + 25
VSS - 0.3 to VCC
VSS - 0.3 to VIN + 0.3
VSS - 0.3 to VIN + 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 ( VIN = 12V, Ta = 25°C, unless otherwise specified )
Symbol
VIN
VFB
IFB
ISW
ISSS
Parameter
Input Voltage
Feedback Voltage
Feedback Bias Current
Switch Current
Current Consumption
During Power Off
∆VOUT
Line Regulation
/VOUT
∆VOUT
Load Regulation
/VOUT
fOSC Oscillation Frequency
Frequency of Current Limit
fOSC1
or Short Circuit Protect
VSH
EN Pin Input Voltage
VSL
ISH
EN Pin Input Leakage
Current
ISL
IOCSET OCSET Pin Bias Current
TSS
Soft-Start Time
RDSON Internal MOSFET Rdson
EFFI
θJA
Efficiency
Conditions
Min.
3.6
0.784
3.5
Typ.
0.8
0.1
-
Max.
23
0.816
0.5
-
Unit
V
V
µA
A
VEN = 0V
-
10
-
µA
VIN = 5V~23V, IOUT = 0.2A
-
1
2
%
IOUT = 0.1 to 3A
-
0.2
0.5
%
Measure waveform at SW pin
240
300
360
KHz
Measure waveform at SW pin
10
-
-
KHz
Evaluate oscillation at SW pin
Evaluate oscillation stop at SW pin
----VIN = 5V, VFB = 0V
VIN =12V, VFB = 0V
VIN = 12V, VOUT = 5V
IOUT = 3A
2.0
75
0.3
-
20
-10
90
2
110
70
0.8
105
5
150
100
-
91
-
-
65
-
-IOUT = 0.1A
IOUT = 0.1A
--
Thermal Resistance
Junction-to-Ambient
AP1510 Rev. 1
3 of 8
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V
µA
µA
µA
ms
mΩ
%
o
C/W
JANUARY 2007
© Diodes Incorporated
AP1510
PWM CONTROL 3A STEP-DOWN CONVERTER
Typical Application Circuit
Vcc
V IN
R OCSET C OCSET
3.9K
Option
C IN
CVcc
0.1uF
R EN
100K
22uH
CC
Optional
AP1510
RA
6.8K
+
FB
OCSET
470uF
VOUT =5V/3A
L1
Output
V SS
EN
D1
C
+
0.1uF
-
C OUT
470uF
RB
1.3K
CEN
0.1uF
Note: V OUT = V FB x (1+R A/R B)
R B=0.7K~5K ohm
Figure 1.
VOUT
L1 Value
VIN=12V, IMAX=3A
2.5V
3.3V
15uH
18uH
5V
22uH
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.
RDS(ON) Current Limiting
The current limit threshold is setting by the external resistor
connecting from VCC 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.
ILOAD × RDS(ON) = IOCSET × ROCSET
See above formula for setting the current limit value.
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 VCC rises above 3.5V.
AP1510 Rev. 1
4 of 8
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JANUARY 2007
© Diodes Incorporated
AP1510
PWM CONTROL 3A STEP-DOWN CONVERTER
AP1510 Vin vs. Frequency
(Vout=3.3V; Iout=0.2A)
350
345
340
335
330
325
320
315
310
305
300
FB (V)
Fosc (KHz)
Typical Performance Characteristics
0
5
10
15
Vin (V)
20
0.84
0.83
0.82
0.81
0.80
0.79
0.78
0.77
0.76
0.75
0.74
0
25
AP1510 Line Regulation
(Vout=3.3V; Iout=0.2A)
3.40
3.35
Vout (A)
Vout(V)
3.30
3.25
3.20
3.15
3.10
0
5
10
Vin(V)
15
20
AP1510 Vin vs. FB
(Vout=3.3V; Iout=0.2A)
25
5
10
15
20
Vin (V)
25
AP1510 Load Regulation
(Vin=12V)
5.10
5.09
5.08
5.07
5.06
5.05
5.04
5.03
5.02
5.01
5.00
0.0
1.0
2.0
3.0
4.0
Iout (A)
Efficiency (%)
AP1510 Efficiency
100
90
80
70
60
50
40
30
20
10
0
Vout:5.0V
Vout:3.3V
0.0
AP1510 Rev. 1
1.0
Iout (A)
2.0
3.0
5 of 8
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JANUARY 2007
© Diodes Incorporated
AP1510
PWM CONTROL 3A STEP-DOWN CONVERTER
Typical Performance Characteristics ( Continued )
AP1510 Vout Ripple
(Vin=12V; Vout=3.3V; Iout=3A)
AP1510 Vout Ripple
(Vin=12V; Vout=3.3V; Iout=0.1A)
Test Circuit
VCC
OUTPUT
FB
Oscillation
open
open
OCSET
A
EN
VCC
+
-
A
+
-
VSS
OUTPUT
VCC
OUTPUT
OCSET
EN
FB
VSS
FB
OCSET
EN
VSS
+
V
-
AP1510 Rev. 1
6 of 8
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JANUARY 2007
© Diodes Incorporated
AP1510
PWM CONTROL 3A STEP-DOWN CONVERTER
Marking Information
(1) SOP-8L
( Top View )
8
5
Logo
Part no.
AP1510
YY WW X
4
Device
Package
AP1510S
Package Information
~
1
ID code: internal
Xth week: 01~52
Year: "01" =2001
"02" =2002
Identification Code
SOP-8L
AP1510
( in mm )
0.254
0.08/0.25
5.79/6.20
3.70/4.10
Package Type: SOP-8L
Gauge Plane
Seating Plane
0.38/1.27
Detail "A"
7°~9°
0.20typ
1.75max.
1.30/1.50
0.35max. 45°
0.3/0.5
1.27typ
7°~9°
Detail "A"
3.70/4.10
4.80/5.30
AP1510 Rev. 1
7 of 8
www.diodes.com
JANUARY 2007
© Diodes Incorporated
AP1510
PWM CONTROL 3A STEP-DOWN CONVERTER
IMPORTANT NOTICE
Diodes Incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other changes without further
notice to any product herein. Diodes Incorporated does not assume any liability arising out of the application or use of any product described herein; neither
does it convey any license under its patent rights, nor the rights of others. The user of products in such applications shall assume all risks of such use and will
agree to hold Diodes Incorporated and all the companies whose products are represented on our website, harmless against all damages.
LIFE SUPPORT
Diodes Incorporated products are not authorized for use as critical components in life support devices or systems without the expressed written approval of the
President of Diodes Incorporated.
AP1510 Rev. 1
8 of 8
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JANUARY 2007
© Diodes Incorporated
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