AP1509
150KHz, 2A 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: 2A
-
SOP-8L packages
-
Low power standby mode
-
Built-in switching transistor on chip
General Description
The AP1509 series are monolithic IC designed for a
step-down DC/DC converter, and own the ability of
driving a 2A load without additional transistor
component. 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 AP1509 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 packages are
available in a standard 8-lead SOP-8 package.
Applications
-
Simple High-efficiency step-down regulator
-
On-card switching regulators
-
Positive to negative converter
Pin Assignments
(Top View)
V
IN
Output
FB
SD
1
2
3
4
8
7
6
5
SOP-8L
GND
GND
GND
GND
Pin Descriptions
Name
V
IN
Output
GND
FB
SD
Description
Operating voltage input
Switching output
Ground
Output voltage feedback control
ON/OFF Shutdown
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. 0.1 Nov 27, 2003
1/8
AP1509
150KHz, 2A 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
o
C
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
B
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
Conditions
V
FB
=1.3V
(Adjustable version only)
Min.
127
110
5
Typ.
-10
150
15
1.25
100
0
Max.
-50
-100
173
173
25
1.4
1.5
Unit
nA
KHz
KHz
V
%
A
of When current limit occurred
and V
FB
< 0.5V, Ta=25
o
C
I
OUT
=2A
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 = 0
leakage
V
FB
=12V force driver off
Output = -1 current
V
IN
=22V
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
threshold voltage
High (regulator OFF)
ON/OFF pin logic input
V
LOGIC
=2.5V (OFF)
current
ON/OFF pin input current V
LOGIC
=0.5V (ON)
Junction to
Thermal Resistance
SOP-8L
case
Thermal Resistance
Junction to
SOP-8L
With copper area of
ambient
approximately 3 in
2
Oscillator frequency
short circuit protect
3
-200
-5
5
70
-
2.0
1.3
10
150
200
0.6
-
-0.01
-0.1
15
70
-1
o
uA
mA
mA
uA
V
uA
C/W
C/W
o
Anachip Corp.
www.anachip.com.tw
Rev.0.1 Nov 27, 2003
3/8
AP1509
150KHz, 2A PWM Buck DC/DC Converter
Typical Performance Characteristics
AP1509 Efficiency v.s. Temperature
(Vin=12V,Vout=5V,Io=2A)
86
85
84
83
82
81
80
79
78
77
76
75
-50 -30 -10 10 30 50 70 90 110 130 150
AP1509 Efficiency v.s. Temperature
(Vin=12V,Vout=3.3V,Io=2A)
81
80
79
Efficiency (%)
Efficiency (%)
78
77
76
75
74
73
-50 -30 -10 10
30
50
70
90 110 130 150
Temperature (TA) (°C)
Temperature (TA) (°C)
AP1509 Saturation Voltage v.s. Temperature
(Vcc=12V,Vfb=0V,VSD=0)
1.4
1.3
AP1509 Switch Current Limit v.s. Temperature
(Vcc=12V,Vfb=0V)
5.5
Switch Current Limit (A)
Saturation Voltage (V)
1.2
1.1
1
0.9
0.8
0.7
-50
-25
0
25
1A
0.5A
5
4.5
4
3.5
3
-50
-30
-10
10
30
50
70
90
2A
50
75
100
125
Temperature (TA) (°C)
Temperature (TA) (°C)
AP1509 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
Rev.0.1 Nov 27, 2003
5/8
Microcontroller MCU
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