AP1507
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
-
TO252-5L packages
-
Low power standby mode
-
Built-in switching transistor on chip
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.
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
Metal Tab GND
Pin Descriptions
Name
V
IN
Output
GND
FB
SD
Description
Operating voltage input
Switching output
Ground
Output voltage feedback control
ON
/OFF Shutdown
TO252-5L
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
AP1507
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
LEAK
I
Q
I
STBY
V
IL
V
IH
I
H
I
L
Parameter
Feedback bias current
Oscillator frequency
Conditions
V
FB
=1.3V
(Adjustable version only)
Min.
Typ.
-10
127
110
5
150
15
1.4
100
0
Max.
-50
-100
173
173
25
1.6
1.7
Unit
nA
KHz
KHz
V
%
of When current limit occurred
and V
FB
< 0.5V, Ta=25
o
C
I
OUT
=3A
Saturation voltage
No outside circuit
V
FB
=0V force driver on
Max. Duty Cycle (ON)
V
FB
=0V force driver on
Min. Duty Cycle (OFF)
V
FB
=12V force driver off
Peak current
Current limit
No outside circuit
V
FB
=0V force driver on
Output No outside circuit
Output = 0V
leakage V
FB
=12V force driver off
current V
IN
=22V
Output = -1V
Quiescent Current
V
FB
=12V force driver off
Standby Quiescent
ON /OFF pin=5V
Current
V
IN
=22V
Low (regulator ON)
ON
/OFF pin logic input
High (regulator OFF)
threshold voltage
ON
/OFF pin logic input
current
Oscillator frequency
short circuit protect
3.6
4.5
5.5
6.5
-200
A
uA
mA
mA
uA
V
-5
5
70
-
2.0
1.3
10
150
200
0.6
-
-0.01
V
LOGIC
=2.5V (OFF)
-0.1
10
50
uA
o
Θ
JC
Θ
JA
ON
/OFF pin input current V
LOGIC
=0.5V (ON)
Junction to
Thermal Resistance
TO252-5L
case
Thermal Resistance
Junction to
With copper area of
TO252-5L
ambient
approximately 2cm
×
2cm
-1
C/W
C/W
o
Specifications with
boldface type
are for full operating temperature range, the other type are for T
J
=25ºC.
Anachip Corp.
www.anachip.com.tw
3/9
Rev.1.1 Oct 29, 2004
AP1507
150KHz, 3A PWM Buck DC/DC Converter
Typical Performance Characteristics
AP1507 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
AP1507 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)
AP1507 Saturation Voltage v.s. Temperature
(Vcc=12V,Vfb=0V,VSD=0)
1.6
1.5
AP1507 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)
AP1507 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
5/9
Rev.1.1 Oct 29, 2004
Power technology
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