DIODES AP1513

AP1513
PWM CONTROL 2A STEP-DOWN CONVERTER
General Description
Features
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AP1513 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 18V
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: Available in “Green” Molding Compound
Lead Free Finish/RoHS Compliant for Lead Free and
“Green” products (Note 1)
AP1513 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 18V, it is also suitable for the operation via
an AC adapter.
Applications
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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
AP1513 X X X
Note:
Lead-Free
Packing
S : SOP-8L
L : Lead-Free
G : Green
- U : Tube
-13 : Taping
1. RoHS revision 13.2.2003. Glass and High Temperature Solder Exemptions Applied, see EU Directive Annex Notes 5 and 7.
Device
(Note 2)
AP1513S
Note:
Package
Tube/Bulk
Package
Packaging Quantity Part Number
Code
Suffix
S
SOP-8L
100
-U
13” Tape and Reel
Quantity
Part Number
Suffix
2500/Tape & Reel
-13
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.
AP1513 Rev. 1
1 of 8
www.diodes.com
JANUARY 2007
© Diodes Incorporated
AP1513
PWM CONTROL 2A STEP-DOWN CONVERTER
Pin Assignments
Pin Descriptions
(Top View)
FB 1
8 Vss
2
7 Vss
EN
Pin
Pin
Description
Name No.
FB
1 Feedback pin
Power-off pin
H: Normal operation
EN
2
(Step-down operation)
L: Step-down operation stopped
(All circuits deactivated)
Add an external resistor to set max
OCSET 3
output current
VCC
4 IC power supply pin
Switch Pin. Connect external
Output 5, 6 inductor/diode here. Minimize trace
area at this pin to reduce EMI
VSS
7, 8 GND Pin
AP1513
OCSET 3
6
Output
VCC 4
5
Output
Block Diagram
Output
Oscillation
Circuit
Reference Voltage
Source with Soft Start
V CC
PWM-Switched
Control Circuit
+
_
FB
Thermal
Shutdown
VEN
EN
AP1513 Rev. 1
2 of 8
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100uA
Vss
OCSET
JANUARY 2007
© Diodes Incorporated
AP1513
PWM CONTROL 2A STEP-DOWN CONVERTER
Absolute Maximum Ratings
Symbol
Parameter
Rating
Unit
VSS - 0.3 to VSS + 20
V
VSS - 0.3 to VCC
V
VCC
VCC Pin Voltage
VFB
Feedback Pin Voltage
VEN
EN Pin Voltage
VSS - 0.3 to VIN + 0.3
V
VOUT
Switch Pin Voltage
VSS - 0.3 to VIN + 0.3
V
PD
Power Dissipation
Internally limited
mW
TJ
Junction Temperature Range
TSTG
Caution:
Storage Temperature Range
ISSS
∆VOUT
/VOUT
∆VOUT
/VOUT
fOSC
fOSC1
VSH
VSL
ISH
ISL
o
-40 to +150
o
C
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
Symbol
VIN
VFB
IFB
ISW
-40 to +125
( VIN = 12V, TA = 25°C, unless otherwise specified )
Parameter
Input Voltage
Feedback Voltage
Feedback Bias Current
Switch Current
Current Consumption During
Power Off
Conditions
-IOUT = 0.1A
IOUT = 0.1A
--
Min.
3.6
0.784
2.5
Typ.
0.8
0.1
-
Max.
18
0.816
0.5
-
Unit
V
V
µA
A
VEN = 0V
-
10
-
µA
Line Regulation
VIN = 5V~18V
-
1
2
%
Load Regulation
IOUT = 0.1 to 2A
-
0.2
0.5
%
Oscillation Frequency
Frequency of Current Limit or
Short Circuit Protect
Measure waveform at SW pin
240
300
400
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=2A
2.0
75
0.3
-
20
-10
90
2
110
70
0.8
105
5
150
100
-
92
-
-
65
-
EN Pin Input Voltage
IOCSET
TSS
EN Pin Input Leakage
Current
OCSET Pin Bias Current
Soft-Start Time
RDSON
Internal MOSFET Rdson
EFFI
Efficiency
θJA
Thermal Resistance
Junction-to-Ambient
AP1513 Rev. 1
3 of 8
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V
µA
µA
µA
ms
mΩ
%
o
C/W
JANUARY 2007
© Diodes Incorporated
AP1513
PWM CONTROL 2A STEP-DOWN CONVERTER
Typical Application Circuit
Output
ROCSET COCSET
3K
Option
CIN
CVcc
0.1uF
33uH
AP1513
+
FB
VSS
EN
REN
100K
RA
6.8K
CC
Optional
OCSET
470uF
VOUT=5V/2A
L1
Vcc
VIN
-
C
+
0.1uF
-
COUT
470uF
RB
1.3K
D1
CEN
0.1uF
Note: VOUT = VFB x (1+RA/RB)
RB=0.7K~5K ohm
Figure 1.
VIN = 12V, IMAX = 2A
2.5V
3.3V
22uH
27uH
VOUT
L1 Value
5V
33uH
Typical Performance Characteristics
AP1513 Vin vs. Frequency
(Vout=3.3V; Iout=0.2A)
350
345
335
FB (V)
Fosc (KHz)
340
330
325
320
315
310
0
AP1513 Rev. 1
2
4
6
8 10 12
Vin (V)
14
16
18
20
4 of 8
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AP1513 Vin vs. FB
(Vout=3.3V; Iout=0.2A)
0.84
0.83
0.82
0.81
0.80
0.79
0.78
0.77
0.76
0.75
0.74
0
2
4
6
8
10
12 14
Vin (V)
16 18
20
JANUARY 2007
© Diodes Incorporated
AP1513
PWM CONTROL 2A STEP-DOWN CONVERTER
Typical Performance Characteristics
( Continued )
AP1513 Line Regulation
(Vout=3.3V; Iout=0.2A)
3.40
3.30
Vout (V)
Vout (V)
3.35
3.25
3.20
3.15
3.10
0
2
4
6
8
10 12 14 16 18 20
Vin (V)
AP1513 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
0.5
1.0
1.5
Iout (A)
2.0
2.5
Efficiency (%)
AP1513 Efficiency
100
90
80
70
60
50
40
30
20
10
0
Vout:5.0V
Vout:3.3V
0.0
0.5
1.0
1.5
2.0
Iout (A)
AP1513 Vout Ripple
( Vin = 12V; Vout = 3.3V; Iout = 0.1A )
AP1513 Rev. 1
5 of 8
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AP1513 Vout Ripple
( Vin = 12V; Vout = 3.3V; Iout = 2A )
JANUARY 2007
© Diodes Incorporated
AP1513
PWM CONTROL 2A STEP-DOWN CONVERTER
Test Circuit
1K
A
VCC
OUTPUT
FB
open
OCSET
EN
+
-
VCC
OUTPUT
VCC
OUTPUT
FB
1K
-
VSS
OCSET
EN
VSS
Feedback function test
33K
FB
6.8K
OCSET
EN
A
+
Enable function test
3K
Oscillation
open
+
VSS
-
V
1.2K
Operation function test
Function Description
PWM Control
The AP1513 consists of DC/DC converters that employ a
pulse-width modulation (PWM) system.
In converters of the AP1513, 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 the pin of OCSET.
When the PWM voltage is less than the voltage at OCSET, an
over-current condition is triggered.
Under Voltage Lockout
The under voltage lockout circuit of the AP1513 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.
See above formula for setting the current limit value.
AP1513 Rev. 1
ILOAD × RDS(ON) = IOCSET × ROCSET
6 of 8
www.diodes.com
JANUARY 2007
© Diodes Incorporated
AP1513
PWM CONTROL 2A STEP-DOWN CONVERTER
Marking Information
(1) SOP-8L
( Top View )
8
5
Logo
Part no.
Blank : Lead Free Package
G
: Green Package
AP1513
YY WW X X
4
~
1
Internal code
Xth week: 01~52
Year: "01" =2001
"02" =2002
Device
Package
Identification Code
AP1513S
SOP-8L
AP1513
Package Information
( 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
AP1513 Rev. 1
7 of 8
www.diodes.com
JANUARY 2007
© Diodes Incorporated
AP1513
PWM CONTROL 2A 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.
AP1513 Rev. 1
8 of 8
www.diodes.com
JANUARY 2007
© Diodes Incorporated
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