AP1506
150KHz, 3A PWM Buck DC/DC Converter
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
-
TO220-5L, TO263-5L and PDIP-8 packages
-
Low power standby mode
-
Built-in switching transistor on chip
General Description
The AP1506 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 to prevent 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 AP1506
series operate 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 packages are available in a
standard 5-lead TO-220, a 5-lead TO-263 or 8-lead
PDIP.
Applications
-
Simple High-efficiency step-down regulator
-
On-card switching regulators
-
Positive to negative converter
Pin Assignments
( Top View )
5 SD
4 FB
3 GND
2 Output
1 V
IN
(Top View)
V
IN
Output
FB
SD
1
2
3
4
8
7
6
5
PDIP-8L
5 SD
4 FB
3 GND
2 Output
1 V
IN
TO220-5L
GND
GND
GND
GND
Pin Descriptions
Pin
Name
V
IN
Output
GND
FB
SD
Pin #
Description
TO
PDIP
1
1
Operating voltage input
2
2
Switching output
3
5~8 Ground
Output voltage feedback
4
3
control
5
4
ON /OFF Shutdown
Metal Tab GND
TO263-5L
( Top View )
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.1.3 Oct 24, 2005
1/13
AP1506
150KHz, 3A PWM Buck DC/DC Converter
Absolute Maximum Ratings
Symbol
V
CC
V
SD
V
FB
V
OUT
P
D
T
ST
T
OP
V
OP
Parameter
Supply Voltage
ON
/OFF Pin Input Voltage
Feedback Pin Voltage
Output Voltage to Ground
Power Dissipation
Storage Temperature
Operating Temperature
Operating Voltage
Rating
+24
-0.3 to +18
-0.3 to +18
-1
Internally limited
-65 to +150
-40 to +125
+4.5 to +22
Unit
V
V
V
V
W
o
C
o
C
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
I
FB
F
OSC
F
SCP
V
SAT
DC
I
CL
I
L
I
Q
I
STBY
V
IL
V
IH
I
H
I
L
θ
JC
θ
JA
Parameter
Feedback Bias Current
Oscillator Frequency
Oscillator Frequency of
Short Circuit Protect
Saturation Voltage
Max. Duty Cycle (ON)
Min. Duty Cycle (OFF)
Current Limit
Output
Leakage
Output =-1V Current
Quiescent Current
Standby Quiescent
Current
Output = 0V
Conditions
V
FB
=1.3V
(Adjustable version only)
Min.
Typ.
-10
127
110
When current limit occurred
and V
FB
< 0.5V, Ta=25
o
C
I
OUT
=3A
No outside circuit
V
FB
=0V force driver on
V
FB
=0V force driver on
V
FB
=12V force driver off
Peak current
No outside circuit
V
FB
=0 force driver on
No outside circuit
V
FB
=12 force driver off
V
IN
=22V
V
FB
=12 force driver off
10
150
30
1.4
100
0
Max.
-50
-100
173
173
50
1.6
Unit
nA
KHz
KHz
V
%
1.7
5.5
3.6
4.5
6.5
-200
A
uA
mA
mA
uA
V
-5
5
70
-
2.0
1.3
ON
/OFF pin=5V
V
IN
=22V
ON
/OFF Pin Logic Input Low (regulator ON)
High (regulator OFF)
Threshold Voltage
ON
/OFF Pin Logic
Input Current
ON
/OFF Pin Input
Current
10
150
200
0.6
-
-0.01
V
LOGIC
=2.5V (OFF)
V
LOGIC
=0.5V (ON)
TO220-5L
TO263-5L
PDIP-8L
TO220-5L with copper area
TO263-5L of approximately
3 in
2
PDIP-8L
-0.1
2.5
3.5
12
28
23
35
uA
-1
o
Thermal Resistance
Junction to Case
Thermal Resistance
Junction to Ambient
C/W
o
C/W
Specifications with
boldface type
are for full operating temperature range, the other type are for T
J
=25ºC.
Anachip Corp.
www.anachip.com.tw
3/13
Rev.1.3 Oct 24, 2005
AP1506
150KHz, 3A PWM Buck DC/DC Converter
Typical Performance Characteristics
AP1506 Efficiency v.s. Temperature
(Vin=12V,Vout=5V,Io=3A)
83
82
81
80
79
78
77
76
75
74
73
72
-50 -30 -10 10
30
50
70
90 110 130 150
AP1506 Efficiency v.s. Temperature
(Vin=12V,Vout=3.3V,Io=3A)
78
77
76
Efficiency (%)
Efficiency (%)
75
74
73
72
71
70
-50 -30 -10 10
30
50
70
90 110 130 150
Temperature (TA) (°C)
Temperature (TA) (°C)
AP1506 Saturation Voltage v.s. Temperature
(Vcc=12V,Vfb=0V,VSD=0)
1.6
1.5
AP1506 Switch Current Limit v.s. Temperature
(Vcc=12V,Vfb=0V)
5.5
Saturation Voltage (V)
1.4
1.3
1.2
1.1
1
0.9
0.8
0.7
-50
-25
0
25
1A
0.5A
3A
2A
Switch Current Limit (A)
5
4.5
4
3.5
3
-50
-30
-10
10
30
50
70
90
50
75
100
125
Temperature (TA) (°C)
Temperature (TA) (°C)
AP1506 Supply Current v.s. Temperature
(Vcc=12V , No Load ,Von/off =0V(Switch ON) ,Von/off =5V(Switch OFF))
15
14
13
12
11
10
9
8
7
6
5
60
Supply Current (mA)
Supply Current (uA)
55
50
45
40
35
30
-50 -30 -10 10
30
50
70
90 110 130 150
Switch OFF
Switch ON
-50 -30 -10 10
30
50
70
90 110 130 150
Temperature (TA) (°C)
Temperature (TA) (°C)
Anachip Corp.
www.anachip.com.tw
5/13
Rev.1.3 Oct 24, 2005
PCB Design
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