AP1509SG-U [DIODES]
2A SWITCHING REGULATOR, 173kHz SWITCHING FREQ-MAX, PDSO8, GREEN, SOP-8;
| 型号： | AP1509SG-U |
| 厂家： | 
DIODES INCORPORATED |
| 描述： | 2A SWITCHING REGULATOR, 173kHz SWITCHING FREQ-MAX, PDSO8, GREEN, SOP-8 开关 光电二极管 |
| 文件： | 总12页 (文件大小：191K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
AP1509
150KHz, 2A PWM BUCK DC/DC CONVERTER
General Description
Features
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. It saves board space. The external
shutdown function can be controlled by logic level and then come
into standby mode. The internal compensation makes feedback
control having 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 occurs and VFB is down below 0.5V, the
switching frequency will be reduced. The AP1509 series operates
at a switching frequency of 150KHz thus allow 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 chips are available in a standard 8-lead
SOP-8 package.
•
•
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
SOP-8L: Available in “Green” Molding Compound (No
Br, Sb)
Lead Free Finish/RoHS Compliant for Lead Free and
“Green” products (Note 1)
•
Applications
•
•
•
Simple High-Efficiency Step-Down Regulator
On-Card Switching Regulators
Positive to Negative Converter
Ordering Information
XX X X X
AP1509
Package
Packing
Output version
Lead Free
L: Lead Free
G: Green
Blank: Adjustable S: SOP-8L
33 : 3.3V
50 : 5.0V
-U : Tube
-13: Taping
12 : 12V
Tube
-13” Tape and Reel
Package Packaging
Device
Part Number
Part Number
Code
(Note 1)
Quantity
Quantity
Suffix
Suffix
AP1509-XXS
S
SOP-8L
100
-U
2500/Tape & Reel
-13
Note: 1. Pad layout as shown on Diodes Inc. suggested pad layout document AP02001, which can be found on our website at
http://www.diodes.com/datasheets/ap02001.pdf.
AP1509 Rev. 1
1 of 12
DECEMBER 2006
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© Diodes Incorporated
AP1509
150KHz, 2A PWM BUCK DC/DC CONVERTER
Pin Descriptions
Pin Assignments
(Top View)
Name
Description
VIN
Output
FB
GND
GND
GND
GND
1
2
3
4
8
7
6
5
VIN
Output
GND
FB
Operating voltage input
Switching output
Ground
Output voltage feedback control
ON/OFF Shutdown
SD
SD
SOP-8L
Block Diagram
SD
VIN
200mV
220mV
Current
Source
bias
1.235V
Reference
2.5V
Regulator
Start
up
+
Comp
_
_
Comp
+
Frequecy
compen-
sation
+
_
Amp
2A
Switch
_
Comp
+
Pre-driver
FB
Output
Gnd
150kHz
OSC.
Thermal
Shutdown
AP1509 Rev. 1
2 of 12
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DECEMBER 2006
© Diodes Incorporated
AP1509
150KHz, 2A PWM BUCK DC/DC CONVERTER
Absolute Maximum Ratings
Symbol
VCC
Parameter
Rating
+24
Unit
V
Supply Voltage
VSD
ON/OFF Pin Input Voltage
Feedback Pin Voltage
Output Voltage to Ground
Power Dissipation
-0.3 to +18
-0.3 to +18
-1
V
VFB
V
VOUT
PD
V
Internally Limited
-65 to +150
-40 to +125
+4.5 to +22
W
oC
oC
V
TST
Storage Temperature
Operating Temperature
Operating Voltage
TOP
VOP
AP1509 Rev. 1
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AP1509
150KHz, 2A PWM BUCK DC/DC CONVERTER
Electrical Characteristics (All Output Voltage Versions)
Unless otherwise specified, VIN = 12V for 3.3V, 5V, adjustable version and VIN = 18V for the 12V version. ILOAD = 0.5A
Specifications with boldface type are for full operating temperature range, the other type are for TJ = 25ºC.
Symbol
Parameter
Conditions
FB = 1.3V
(Adjustable version only)
Min.
Typ.
-10
Max.
-50
-100
173
173
Unit
V
IFB
Feedback Bias Current
nA
127
110
150
FOSC
FSCP
Oscillator Frequency
KHz
KHz
Oscillator Frequency of
Short Circuit Protect
When current limit occurred
and VFB < 0.5V, Ta = 25 oC
10
30
50
1.4
1.5
I
OUT = 2A
No outside circuit
FB = 0V force driver on
VSAT
DC
ICL
Saturation Voltage
1.25
V
%
A
V
Max. Duty Cycle (ON)
Min. Duty Cycle (OFF)
VFB = 0V force driver on
VFB = 12V force driver off
Peak current
100
0
Current Limit
No outside circuit
3
VFB = 0V force driver on
Output
Output = 0
No outside circuit
VFB = 12V force driver off
-200
uA
IL
Leakage
Current
Output = -1
VIN = 22V
-5
5
mA
mA
IQ
ISTBY
VIL
Quiescent Current
Standby Quiescent
Current
VFB = 12V force driver off
ON/OFF pin = 5V
VIN = 22V
10
150
200
0.6
70
uA
Low (regulator ON)
-
ON/OFF Pin Logic Input
Threshold Voltage
1.3
V
VIH
High (regulator OFF)
VLOGIC = 2.5V (OFF)
2.0
-
ON/OFF Pin Logic Input
Current
ON/OFF Pin Input
Current
IH
IL
-0.01
-1
uA
VLOGIC = 0.5V (ON)
-0.1
15
Junction to
case
ΘJC
Thermal Resistance
SOP-8L
SOP-8L
oC/W
oC/W
Thermal Resistance
with a copper area of
approximately 3 in2
Junction to
ambient
ΘJA
70
AP1509 Rev. 1
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AP1509
150KHz, 2A PWM BUCK DC/DC CONVERTER
Electrical Characteristics (Continued)
Specifications with boldface type are for full operating temperature range, the other type are for TJ = 25ºC.
Symbol
VFB
Parameter
Conditions
VMin
Typ.
VMax
Unit
4.5V < VIN < 22V
0.2A < ILOAD < 2A
OUT programmed for 1.18
Output
Feedback
1.193
1.267
1.28
1.23
V
V
AP1509-ADJ
3V
η
Efficiency
VIN = 12V, ILOAD=2A
76
76
3.3
78
5
%
V
4.75V < VIN < 22V
0.2A < ILOAD < 2A
3.168
3.135
3.432
3.465
VOUT
Output Voltage
Efficiency
AP1509-3.3V
AP1509-5V
AP1509-12V
η
VIN = 12V, ILOAD = 2A
78
%
V
7V < VIN < 22V
0.2A < ILOAD < 2A
4.8
4.75
5.2
5.25
VOUT
Output Voltage
Efficiency
η
VIN = 12V, ILOAD = 2A
83
83
12
90
%
V
15V < VIN < 22V
0.2A < ILOAD < 2A
11.52
11.4
12.48
12.6
VOUT
Output Voltage
Efficiency
η
VIN = 15V, ILOAD = 2A
90
%
AP1509 Rev. 1
5 of 12
DECEMBER 2006
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AP1509
150KHz, 2A PWM BUCK DC/DC CONVERTER
Typical Application Circuit
(1) Fixed Type Circuit
FB
12V
DC Input
3
3.3V/2A
L1
47uH
Output
Output Load
AP1509
-33
1
4
2
Inductor
V
in
5
6
7
8
GNDGNDGNDGND
SD
Co
Capacitor
C
D1
Schottky Diode
in
Capacitor
(2) Adjustable Type Circuit
R2 1K
R1 1K
FB
3
12V
DC Input
L1
39uH
2.5V/2A
Output Load
Output
1
4
2
8
AP1509
Vin
Inductor
5
6
7
D1
Schottky
Diode
SD GndGndGnd Gnd
Cin
Capacitor
Co
Capacitor
R1
Vout = VFB ×(1 +
)
R2
VFB = 1.23V
R2 = 1K ~ 3K
(3) Delay Start Circuit
R2 1K
Vin
R1 1K
FB
3
12V
DC Input
L1
39uH
2.5V/2A
Output Load
Output
1
4
2
AP1509
Inductor
CDELAY
0.1uF
5
6
7
8
D1
Schottky
Diode
Co
Capacitor
SD
GndGndGnd Gnd
RDELAY
10K
Cin
Capacitor
AP1509 Rev. 1
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DECEMBER 2006
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AP1509
150KHz, 2A PWM BUCK DC/DC CONVERTER
Typical Performance Characteristics
AP1509 Efficiency vs. Temperature (Vin=12V,
Vout=5V, Io=2A)
AP1509 Efficiency vs. Temperature (Vin=12V,
Vout=3.3V, Io=2A)
86
81
80
79
78
77
76
75
74
85
84
83
82
81
80
79
78
77
76
73
75
-50 -30 -10 10 30 50 70 90 110 130 150
-50 -30 -10 10 30 50 70 90 110 130 150
Temperature (T ) (°C)
A
Temperature (TA) (°C)
AP1509 Saturation Voltage vs. Temperature
(Vcc=12V, Vfb=0V, VSD=0)
AP1509 Switch Current Limit vs. Temperature
(Vcc = 12V, Vfb = 0V)
1.4
1.3
5.5
5
1.2
2A
1.1
4.5
4
1A
1
0.9
0.5A
3.5
3
0.8
0.7
-50
-30
-10
10
30
50
70
90
-50
-25
0
25
50
75
100
125
Temperature (TA)ꢀ(°C)
Temperature (TA) (°C)
AP1509 Supply Current vs. 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
55
50
45
40
35
30
Switch OFF
Switch ON
-50 -30 -10 10 30 50 70 90 110 130 150
Temperature (TA) (°C)
-50 -30 -10 10 30 50 70 90 110 130 150
Temperature (TA) (°C)
AP1509 Rev. 1
7 of 12
DECEMBER 2006
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© Diodes Incorporated
AP1509
150KHz, 2A PWM BUCK DC/DC CONVERTER
Typical Performance Characteristics (Continued)
AP1509 Threshold Voltage vs. Temperature
(Vcc=12V, Io=100mA)
AP1509 ON/OFF Current vs. ON/OFF Voltage
(Vin=12V)
1.7
1.6
1.5
1.4
1.3
1.2
1.1
1
10
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
0.9
0.8
0
3
6
9
12
15
18
21
-50 -30 -10 10 30 50 70 90 110 130 150
Temperature (TA) (°C)
ON/OFF Voltage (V)
AP1509 Frequency vs. Temperature
(Vcc=12V, Io=500mA, Vout=5V)
AP1509 Feedback Current vs. Temperature
(Vcc=12V, Vout=5V, Vfb=1.3V)
170
165
160
155
150
145
10
0
-10
-20
-30
-40
140
-50
-50 -30 -10 10 30 50 70 90 110 130 150
-50 -30 -10 10 30 50 70 90 110 130 150
Temperature (TA) (°C)
Temperature (TA) (°C)
AP1509 Output Voltage vs. Temperature
(Vin=12V, Io=2A)
3.5
3.45
3.4
3.35
3.3
3.25
3.2
3.15
3.1
3.05
3
2.95
2.9
-40 -20
0
20 40 60 80 100 120 140 160
Temperature (TA) (°C)
AP1509 Rev. 1
8 of 12
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© Diodes Incorporated
AP1509
150KHz, 2A PWM BUCK DC/DC CONVERTER
Function Description
Pin Functions
Thermal Considerations
+VIN
The SOP-8L package needs a heat sink under most conditions.
The size of the heat sink depends on the input voltage, the output
voltage, the load current and the ambient temperature. The
AP1509 junction temperature rises above ambient temperature
for a 2A load and different input and output voltages. The data for
these curves was taken with the AP1509 (SOP-8 package)
operating as a buck-switching regulator in an ambient
temperature of 25oC (still air). These temperature increments are
all approximate and are affected by many factors. Higher ambient
temperatures require more heat sinker.
This is the positive input supply for the IC switching regulator. A
suitable input bypass capacitor must be presented at this pin to
minimize voltage transients and to supply the switching currents
needed by the regulator.
Ground
Circuit ground.
Output
Internal switch. The voltage at this pin switches between (+VIN
SAT) and approximately – 0.5V, with a duty cycle of
approximately VOUT / VIN. To minimize coupling to sensitive
circuitry, the PC board copper area connected to this pin should
be minimized.
–
V
For the best thermal performance, wide copper traces and
generous amounts of printed circuit board copper should be used
in the board layout (One exception is the output (switch) pin,
which should not have large areas of copper). Large areas of
copper provide the best transfer of heat (lower thermal resistance)
to the surrounding air, and moving air lowers the thermal
resistance even further.
Feedback
Senses the regulated output voltage to complete the feedback
loop.
Package thermal resistance and junction temperature increments
are all approximate. The increments are affected by a lot of
factors. Some of these factors include board size, shape,
thickness, position, location, and even board temperature.
Other factors are, trace width, total printed circuit copper area,
copper thickness, single or double-sided, multi-layer board and
the amount of solder on the board.
SD
Allows the switching regulator circuit to be shutdown using logic
level signals thus dropping the total input supply current to
approximately 150uA. Pulling this pin below a threshold voltage
of approximately 1.3V turns the regulator on, and pulling this pin
above 1.3V (up to a maximum of 18V) shuts the regulator down.
If this shutdown feature is not needed, the SD pin can be wired to
the ground pin.
The effectiveness of the PC board to dissipate heat also depends
on the size, quantity and spacing of other components on the
board, as well as whether the surrounding air is still or moving.
Furthermore, some of these components such as the catch diode
will add heat to the PC board and the heat can vary as the input
voltage changes. For the inductor, depending on the physical
size, type of core material and the DC resistance, it could either
act as a heat sink taking heat away from the board, or it could
add heat to the board.
AP1509 Rev. 1
9 of 12
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DECEMBER 2006
© Diodes Incorporated
AP1509
150KHz, 2A PWM BUCK DC/DC CONVERTER
Typical Performance Characteristics
Frequency vs. Temperature
in = 5V; Vout = 15V
Feedback Voltage vs. Temperature
Vin = 5V; Vout = 15V
V
1.26
1000
900
800
700
600
500
400
300
200
100
0
1.25
1.24
1.23
1.22
-40
10
60
110
-40
10
60
110
Temperature (oC)
Temperature (oC)
Supply Current vs. Temperature
Supply Current vs. Supply Voltage
Vout = 15V; Iout = 0A
Vin = 5V; Vout = 15V; Iout = 0A
3
2.5
2
3
2.5
2
1.5
1
1.5
1
0.5
0.5
0
0
-40
10
60
110
0
5
10
15
Temperature (oC)
Supply Voltage (V)
Efficiency vs. Output Current
in = 5V; Vout = 15V
Efficiency vs. Output Current
Vin = 3.3V; Vout = 15V
V
90
85
80
75
70
85
75
65
55
0
20
40
60
0
20
40
60
Output Current (mA)
Output Current (mA)
.
AP1509 Rev. 1
10 of 12
DECEMBER 2006
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© Diodes Incorporated
AP1509
150KHz, 2A PWM BUCK DC/DC CONVERTER
Marking Information
(1) SOP-8L
(Top view)
Part Number
Output Type:
Blank: Adjustable
33: 3.3V
50: 5.0V
12: 12V
Logo
G: Green
1509-XX
YYWW XX
Date Code
X: Internal code
WW: Nth week
YY: Year
Package Information
(1) SOP-8L
Gauge Plane
Seating Plane
0.38/1.27
Detail "A"
7°~9°
7°~9°
0.35max.
45°
Detail "A"
0.3/0.5
3.70/4.10
1.27typ
4.80/5.30
AP1509 Rev. 1
11 of 12
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DECEMBER 2006
© Diodes Incorporated
AP1509
150KHz, 2A PWM BUCK DC/DC CONVERTER
IMPORTANT NOTICE
Diodes Incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other changes without further
notice to any product herein. Diodes Incorporated does not assume any liability arising out of the application or use of any product described herein; neither
does it convey any license under its patent rights, nor the rights of others. The user of products in such applications shall assume all risks of such use and will
agreeto hold DiodesIncorporatedand all the companieswhose productsare represented onour website, harmlessagainst all damages.
LIFE SUPPORT
Diodes Incorporated productsare notauthorizedfor use ascriticalcomponentsin lifesupportdevices or systemswithout theexpressed written approval ofthe
PresidentofDiodesIncorporated.
AP1509 Rev. 1
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