AP1507
150KHz, 3A PWM Buck DC/DC 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.1.1 Oct 29, 2004
1/9
Features
- Output voltage: 3.3V, 5V, 12V and adjustable
output version
- Adjustable version output voltage range, 1.23V to
18V+4%
- 150KHz +15% fixed switching frequency
- Voltage mode non-synchronous PWM control
- Thermal-shutdown and current-limit protection
- ON /OFF shutdown control input
- Operating voltage can be up to 22V
- Output load current: 3A
- TO252-5L packages
- Low power standby mode
- Built-in switching transistor on chip
Applications
- Simple High-efficiency step-down regulator
- On-card switching regulators
- Positive to negative converter
General Description
The AP1507 series are monolithic IC designed for a
step-down DC/DC converter, and own the ability of
driving a 3A load without external transistor. Due to
reducing the number of external component, the
board space can be saved easily. The external
shutdown function can be controlled by logic level
and then come into standby mode. The internal
compensation makes feedback control have good
line and load regulation without external design.
Regarding protected function, thermal shutdown is
to prevent over temperature operating from damage,
and current limit is against over current operating of
the output switch. If current limit function occurred
and V
FB
is down to 0.5V below, the switching
frequency will be reduced. The AP1507 series
operates at a switching frequency of 150KHz thus
allowing smaller sized filter components than what
would be needed with lower frequency switching
regulators. Other features include a guaranteed
+4% tolerance on output voltage under specified
input voltage and output load conditions, and +15%
on the oscillator frequency. The output version
included fixed 3.3V, 5V, 12V, and an adjustable
type. The package is available in a 5-lead TO-252.
Pin Assignments
( Top View )
TO252-5L
5 SD
4 FB
3 Gnd
2 Output
Metal Tab GND
1 V
IN
Pin Descriptions
Name
Description
V
IN
Operating voltage input
Output Switching
output
GND Ground
FB
Output voltage feedback control
SD
ON
/OFF Shutdown
AP1507
150KHz, 3A PWM Buck DC/DC Converter
Anachip Corp.
www.anachip.com.tw
Rev.1.1 Oct 29, 2004
2/9
Ordering Information
Package
D5: TO252-5L
Output version
AP1507 XX X X X
Packing
Blank : Tube
A : Taping
Blank : Adjustable
-33 : 3.3V
-50 : 5.0V
-12 : 12V
Lead Free
Blank : Normal
L : Lead Free Package
Block Diagram
Current
Source
bias
1.235V
Reference
2.5V
Regulator
150kHz
OSC.
Start
up
+
+
_
+
_
Thermal
Shutdown
Pre-driver
Comp
Comp
Gnd
Output
V
IN
SD
FB
220mV
200mV
3A
Switch
+
_
_
Amp
Comp
Frequecy
compen-
sation
AP1507
150KHz, 3A PWM Buck DC/DC Converter
Anachip Corp.
www.anachip.com.tw Rev.1.1 Oct 29, 2004
3/9
Absolute Maximum Ratings
Symbol
Parameter
Rating
Unit
V
CC
Supply
Voltage
+24
V
V
SD
ON
/OFF Pin input voltage
-0.3 to +18
V
V
FB
Feedback Pin voltage
-0.3 to +18
V
V
OUT
Output voltage to Ground
-1
V
P
D
Power
dissipation
Internally limited
W
T
ST
Storage temperature
-65 to +150
o
C
T
OP
Operating temperature
-40 to +125
o
C
V
OP
Operating voltage
+4.5 to +22
V
Electrical Characteristics (All Output Voltage Versions)
Unless otherwise specified, V
IN
=12V for 3.3V, 5V, adjustable version and V
IN
=18V for the 12V version. I
LOAD
= 0.5A
Symbol
Parameter
Conditions
Min.
Typ.
Max.
Unit
-50
I
FB
Feedback bias current
V
FB
=1.3V
(Adjustable version only)
-10
-100
nA
127 150 173
F
OSC
Oscillator
frequency
110 173
KHz
F
SCP
Oscillator frequency of
short circuit protect
When current limit occurred
and V
FB
< 0.5V, Ta=25
o
C
5 15 25
KHz
1.6
V
SAT
Saturation
voltage
I
OUT
=3A
No outside circuit
V
FB
=0V force driver on
1.4
1.7
V
Max. Duty Cycle (ON)
V
FB
=0V force driver on
100
DC
Min. Duty Cycle (OFF)
V
FB
=12V force driver off
0
%
5.5
I
CL
Current
limit
Peak current
No outside circuit
V
FB
=0V force driver on
3.6 4.5
6.5
A
Output = 0V
No outside circuit
V
FB
=12V force driver off
-200
uA
I
LEAK
Output = -1V
Output
leakage
current V
IN
=22V
-5
mA
I
Q
Quiescent
Current
V
FB
=12V force driver off
5
10
mA
150
I
STBY
Standby Quiescent
Current
ON /OFF pin=5V
V
IN
=22V
70
200
uA
V
IL
Low (regulator ON)
-
0.6
V
IH
ON
/OFF pin logic input
threshold voltage
High (regulator OFF)
2.0
1.3
-
V
I
H
ON
/OFF pin logic input
current
V
LOGIC
=2.5V (OFF)
-0.01
I
L
ON
/OFF pin input current V
LOGIC
=0.5V (ON)
-0.1
-1
uA
JC
Thermal Resistance
TO252-5L
Junction to
case
10
o
C/W
JA
Thermal Resistance
With copper area of
approximately 2cm 2cm
TO252-5L
Junction to
ambient
50
o
C/W
Specifications with boldface type are for full operating temperature range, the other type are for T
J
=25C.
AP1507
150KHz, 3A PWM Buck DC/DC Converter
Anachip Corp.
www.anachip.com.tw Rev.1.1 Oct 29, 2004
4/9
Electrical Characteristics (Continued)
Symbol
Parameter
Conditions
Typ.
Limit
Unit
FB
V
Output
Feedback
5V < V
IN
< 22V
0.2A < I
LOAD
< 3A
V
OUT
programmed for
3V
1.23
1.193/
1.18
1.267/
1.28
V
V
MIN
V
MAX
AP1507-ADJ
Efficiency V
IN
= 12V, I
LOAD
=3A
74
%
OUT
V
Output voltage
5.5V < V
IN
< 22V
0.2A < I
LOAD
< 3A
3.3
3.168/
3.135
3.432/
3.465
V
V
MIN
V
MAX
AP1507-3.3V
Efficiency V
IN
= 12V, I
LOAD
=3A
75
%
OUT
V
Output voltage
8V < V
IN
< 22V
0.2A < I
LOAD
< 3A
5
4.8/4.75
5.2/5.25
V
V
MIN
V
MAX
AP1507-5V
Efficiency V
IN
= 12V, I
LOAD
=3A
80
%
OUT
V
Output voltage
15V < V
IN
< 22V
0.2A < I
LOAD
< 3A
12
11.52/11.4
12.48/12.6
V
V
MIN
V
MAX
AP1507-12V
Efficiency V
IN
= 16V, I
LOAD
= 3A
89
%
Specifications with boldface type are for full operating temperature range, the other type are for T
J
=25C.
AP1507
150KHz, 3A PWM Buck DC/DC Converter
Anachip Corp.
www.anachip.com.tw Rev.1.1 Oct 29, 2004
5/9
Typical Performance Characteristics
AP1507 Efficiency v.s. Temperature
(Vin=12V,Vout=5V,Io=3A)
72
73
74
75
76
77
78
79
80
81
82
83
-50 -30 -10 10 30 50 70 90 110 130 150
Temperature (TA) (C)
Efficiency (%)
AP1507 Efficiency v.s. Temperature
(Vin=12V,Vout=3.3V,Io=3A)
70
71
72
73
74
75
76
77
78
-50 -30 -10 10 30 50 70 90 110 130 150
Temperature (TA) (C)
Efficie
n
cy (%)
AP1507 Saturation Voltage v.s. Temperature
(Vcc=12V,Vfb=0V,VSD=0)
0.7
0.8
0.9
1
1.1
1.2
1.3
1.4
1.5
1.6
-50
-25
0
25
50
75
100
125
Temperature (TA)(C)
S
a
turati
on V
o
l
t
age (V
)
3A
2A
1A
0.5A
AP1507 Switch Current Limit v.s. Temperature
(Vcc=12V,Vfb=0V)
3
3.5
4
4.5
5
5.5
-50
-30
-10
10
30
50
70
90
Temperature (TA) (C)
Swi
t
ch Current Li
mi
t (A)
AP1507 Supply Current v.s. Temperature
(Vcc=12V , No Load ,Von/off =0V(Switch ON) ,Von/off =5V(Switch OFF))
5
6
7
8
9
10
11
12
13
14
15
-50 -30 -10 10
30
50
70
90 110 130 150
Temperature (TA) (C)
Suppl
y Current
(mA)
Switch ON
30
35
40
45
50
55
60
-50 -30 -10 10
30
50
70
90 110 130 150
Temperature (TA) (C)
Suppl
y Current
(uA)
Switch OFF
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