AP1511
PWM Control 5A Step-Down Converter
This datasheet contains new product information. Anachip Corp. reserves the rights to modify the product specification without notice. No liability is assumed as a result of the use of
this product. No rights under any patent accompany the sale of the product.
Rev. 1.5 Apr 10, 2006
1/5
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-16L Pb-Free Package.
Applications
-Microprocessor core supply
-Networking power supply
-LCD MNT, TV power supply
-Telecom power supply
General Description
AP1511 consists of step-down switching regulator
with PWM control. These devices include a reference
voltage source, oscillation circuit, error amplifier,
internal PMOS and etc.
AP1511 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-16L
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.
Pin Assignments
AP1511
1
2
3
15
14
13
12
11
10
9
8
7
6
5
4
16
(Top View)
SOP-16L
GND
GND
NC
NC
V
C
PVcc
Output
Output
GND
GND
FB
EN
OCSET
Vcc
Output
Output
Pin Descriptions
Pin
Name
Pin
No.
Description
GND
1 GND
pin
GND
2 GND
pin
FB 3
Feedback
pin
EN 4
H: Normal operation
L: Step-down operation stopped
OCSET
5
Add an external resistor to set max
output current.
Vcc 6
Signal
Vcc
Output
7 Switch
output
pin
Output
8 Switch
output
pin
Output
9 Switch
output
pin
Output
10 Switch
output
pin
PVcc
11 Power
Vcc
V
C
12 Voltage clamp pin
NC 13
Not
connected
NC 14
Not
connected
GND
15 GND
pin
GND
16 GND
pin
AP1511
PWM Control 5A Step-Down Converter
Anachip Corp.
www.anachip.com.tw Rev. 1.5 Apr 10, 2006
2/5
Ordering Information
AP 1511 X X
Package
Packing
S: SOP-16L
Blank : Tube
A : Taping
Block Diagram
Oscillation
Circuit
Reference Voltage
Source with Soft Start
PWM - Switched
Control Circuit
+
-
Vss
EN
Vccp
Output
100 uA
OCSET
FB
V
C
Vcc
CT
V
EN
Driver
Thermal
Shutdown
Absolute Maximum Ratings
Symbol
Parameter
Rating
Unit
V
CC
V
CC
Pin Voltage
V
SS
- 0.3 to V
SS
+ 25
V
V
FB
V
OUT
Pin Voltage
V
SS
- 0.3 to V
CC
V
V
EN
EN Pin Voltage
V
SS
- 0.3 to V
CC
+ 0.3
V
V
OUTPUT
Switch
Pin
Voltage
V
SS
- 0.3 to V
IN
+ 0.3
V
P
D
Power Dissipation
(Note)
Internally
limited
mW
T
OPR
Operating Temperature Range
-20 to +125
o
C
T
STG
Storage Temperature Range
-40 to +150
o
C
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.
Note: Due to the IC and SBD and Inductor were hot in high current, if you need to reduce the operation temperature that you must
increase the component space or thermal dissipation space.
AP1511
PWM Control 5A Step-Down Converter
Anachip Corp.
www.anachip.com.tw Rev. 1.5 Apr 10, 2006
3/5
Electrical Characteristics
(V
IN
= 12V, T
a
=25C, unless otherwise specified)
Symbol
Parameter
Conditions
Min.
Typ.
Max.
Unit
V
IN
Input
Voltage
--
3.6
-
23 V
V
FB
Feedback
Voltage
--
0.784
0.8 0.816
V
I
FB
Feedback
Bias
Current
I
OUT
=0.1A -
0.1
0.5
A
I
SW
Switch
Current
--
5.5
-
-
A
I
SSS
Current Consumption During
Power Off
V
EN
=0V -
10
-
A
V
OUT
/V
OUT
Line Regulation
V
IN
= 3.6V~23V
-
1
2
%
V
OUT
/V
OUT
Load Regulation
I
OUT
= 0 to 5A
-
0.5
1
%
f
OSC
Oscillation Frequency
Measure waveform at SW pin
240
300
360
KHz
f
OSC1
Frequency of Current Limit
or Short Circuit Protect
Measure waveform at SW pin
10
-
-
KHz
V
SH
Evaluate oscillation at SW pin
2.0
-
-
V
SL
Power-Off Pin Input Voltage
Evaluate oscillation stop at SW pin
-
-
0.8
V
I
SH
--
-
20
-
A
I
SL
Power-Off Pin Input Leakage
Current
--
- -10 - A
I
OCSET
OCSET Pin Bias Current
--
75
90
105
A
T
SS
Soft-Start
Time
--
0.3
2
5 ms
V
IN
=5V, V
FB
=0V -
70
100
R
DSON
Internal MOSFET Rdson
V
IN
=12V, V
FB
=0V -
50
70
m
EFFI Efficiency
V
IN
= 12V, V
OUT
= 5V
I
OUT
= 5A
- 90 - %
JA
Thermal Resistance
Junction-to-Ambient
-
50
-
o
C/W
Typical Application Circuit
AP1511
EN
C
C
D1
FB
OUTPUT
R
OCSET
OCSET
PVcc
Vcc
V
C
CVcc
C
EN
20K
0.1uF
R
EN
C
IN
C
OUT
Optional
V
SS
C
OCSET
V
IN
R
B
R
A
V
OUT
Note: V
OUT
= V
REF
x (1+R
A
/R
B
)
R
B
=1K~10K ohm
470uF
C
0.1uF
6.8K
1.3K
L1 15uH
0.1uF
680uF
3K
2.2
0.1uF
C
V
IN
=12V, I
MAX
=5A
V
OUT
2.5V 3.3V 5V
L1 Value
10uH 12uH 15uH
AP1511
PWM Control 5A Step-Down Converter
Anachip Corp.
www.anachip.com.tw Rev. 1.5 Apr 10, 2006
4/5
Typical Performance Characteristics
Efficiency (Vin=+5V)
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
0.0
1.0
2.0
3.0
4.0
5.0
6.0
Iout (A)
E
f
f
i
ci
e
n
c
y (
%
)
Vout:3.3V
Efficiency (Vin=+12V)
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
0.0
1.0
2.0
3.0
4.0
5.0
6.0
Iout (A)
E
f
f
i
ci
e
n
c
y (
%
)
Vout:3.3V
Vout:5.0V
Test Circuit
A
FB
VCC
VSS
EN
open
open
FB
VCC
VSS
EN
+
-
Osc
i
l
l
a
t
io
n
OUTPUT
OUTPUT
A
FB
VCC
VSS
EN
+
-
+
-
V
OUTPUT
OCSET
OCSET
OCSET
PVcc
PVcc
PVcc
Enable function test
Feedback function test
Operation function test
Function Description
PWM Control
The AP1511 consists of DC/DC converters that
employ a pulse-width modulation (PWM) system.
In converters of the AP1511, 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.
AP1511
PWM Control 5A Step-Down Converter
Anachip Corp.
www.anachip.com.tw Rev. 1.5 Apr 10, 2006
5/5
Marking Information
( Top View )
SOP-16L
1
9
8
AP1511
YY WW X
Logo
ID code: internal
Year: "01" = 2001
"02" = 2002
Xth week: 01~52
~
16
Part No.
Package Information
Package Type: SOP-16L
E
H
VIEW "A"
L
0.015x45
o
C
7
o
(4X)
VIEW "A"
A
A1
D
B
e
7
o
(4X)
y
A2
Dimensions In Millimeters
Dimensions In Inches
Symbol
Min.
Nom.
Max.
Min.
Nom.
Max.
A 1.40 1.60 1.75 0.055
0.063
0.069
A1
0.10 - 0.25
0.040 - 0.010
A2 1.30 1.45 1.50 0.051
0.057
0.059
B 0.33 0.41 0.51 0.013
0.016
0.020
C 0.19 0.20 0.25
0.0075
0.008
0.0098
D 9.80 9.90 10.00 0.386 0.390 0.394
E 3.80 3.90 4.00 0.150
0.154
0.157
e - 1.27 - - 0.050 -
H 5.80 6.00 6.20 0.228
0.236
0.244
L 0.38 0.71 1.27 0.015
0.028
0.050
0 - 8 0 - 8
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