Diodes AP1509-XXS 150khz, 2a pwm buck dc/dc converter Datasheet

AP1509
150KHz, 2A PWM BUCK DC/DC CONVERTER
General Description
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
SOP-8L: Available in “Green” Molding Compound (No
Br, Sb)
Lead Free Finish/RoHS Compliant for Lead Free and
“Green” products (Note 1)
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.
Applications
•
•
•
Simple High-Efficiency Step-Down Regulator
On-Card Switching Regulators
Positive to Negative Converter
Ordering Information
AP1509
XX X X X
Output version
Package
Blank : Adjustable
33 : 3.3V
50 : 5.0V
12 : 12V
S: SOP-8L
Device
AP1509-XXS
Package Packaging
Code
(Note 1)
S
SOP-8L
Lead Free
L: Lead Free
G: Green
Packing
-U : Tube
-13: Taping
Tube
Part Number
Quantity
Suffix
100
-U
-13” Tape and Reel
Part Number
Quantity
Suffix
2500/Tape & Reel
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
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AP1509
150KHz, 2A PWM BUCK DC/DC CONVERTER
Pin Descriptions
Pin Assignments
(Top View)
VIN
Output
FB
SD
1
2
3
4
8
7
6
5
Name
VIN
Output
GND
FB
SD
GND
GND
GND
GND
Description
Operating voltage input
Switching output
Ground
Output voltage feedback control
ON/OFF Shutdown
SOP-8L
Block Diagram
SD
VIN
200mV
Current
Source
bias
1.235V
Reference
2.5V
Regulator
220mV
Start
up
+
Comp
_
_
Comp
+
Frequecy
compensation
_
FB
+
Amp
_
Comp
+
Pre-driver
2A
Switch
Output
150kHz
OSC.
AP1509 Rev. 1
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Thermal
Shutdown
Gnd
DECEMBER 2006
© Diodes Incorporated
AP1509
150KHz, 2A PWM BUCK DC/DC CONVERTER
Absolute Maximum Ratings
Symbol
Parameter
Rating
Unit
+24
V
VCC
Supply Voltage
VSD
ON/OFF Pin Input Voltage
-0.3 to +18
V
VFB
Feedback Pin Voltage
-0.3 to +18
V
VOUT
Output Voltage to Ground
-1
V
PD
TST
Power Dissipation
Internally Limited
Storage Temperature
-65 to +150
o
TOP
Operating Temperature
-40 to +125
VOP
Operating Voltage
+4.5 to +22
AP1509 Rev. 1
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o
C
C
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DECEMBER 2006
© Diodes Incorporated
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
IFB
Parameter
Feedback Bias Current
FOSC
Oscillator Frequency
FSCP
Oscillator Frequency of
Short Circuit Protect
VSAT
Saturation Voltage
DC
Max. Duty Cycle (ON)
Min. Duty Cycle (OFF)
ICL
Current Limit
IL
IQ
ISTBY
VIL
VIH
IH
IL
Output
Leakage
Output = -1 Current
Quiescent Current
Standby Quiescent
Current
Output = 0
ON/OFF Pin Logic Input
Threshold Voltage
ON/OFF Pin Logic Input
Current
ON/OFF Pin Input
Current
Conditions
VFB = 1.3V
(Adjustable version only)
When current limit occurred
and VFB < 0.5V, Ta = 25 oC
IOUT = 2A
No outside circuit
VFB = 0V force driver on
VFB = 0V force driver on
VFB = 12V force driver off
Peak current
No outside circuit
VFB = 0V force driver on
No outside circuit
VFB = 12V force driver off
VIN = 22V
VFB = 12V force driver off
ON/OFF pin = 5V
VIN = 22V
Low (regulator ON)
High (regulator OFF)
Min.
Typ.
-10
127
110
150
10
30
Unit
50
KHz
nA
KHz
1.4
1.25
V
1.5
100
0
%
3
A
-200
-5
5
70
2.0
1.3
VLOGIC = 2.5V (OFF)
VLOGIC = 0.5V (ON)
Max.
-50
-100
173
173
uA
mA
mA
10
150
200
0.6
uA
V
-0.01
uA
-0.1
-1
ΘJC
Thermal Resistance
SOP-8L
Junction to
case
15
o
ΘJA
Thermal Resistance
with a copper area of
approximately 3 in2
SOP-8L
Junction to
ambient
70
o
AP1509 Rev. 1
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C/W
C/W
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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
AP1509-ADJ
AP1509-3.3V
AP1509-5V
AP1509-12V
AP1509 Rev. 1
Conditions
VMin
Typ.
VMax
Unit
VFB
Output
Feedback
4.5V < VIN < 22V
0.2A < ILOAD < 2A
VOUT programmed for
3V
1.193
1.18
1.23
1.267
1.28
V
η
Efficiency
VIN = 12V, ILOAD=2A
76
76
Output Voltage
4.75V < VIN < 22V
0.2A < ILOAD < 2A
3.168
3.135
3.3
Efficiency
VIN = 12V, ILOAD = 2A
78
78
Output Voltage
7V < VIN < 22V
0.2A < ILOAD < 2A
4.8
4.75
5
Efficiency
VIN = 12V, ILOAD = 2A
83
83
Output Voltage
15V < VIN < 22V
0.2A < ILOAD < 2A
11.52
11.4
12
Efficiency
VIN = 15V, ILOAD = 2A
90
90
VOUT
η
VOUT
η
VOUT
η
Parameter
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%
3.432
3.465
V
%
5.2
5.25
V
%
12.48
12.6
V
%
DECEMBER 2006
© Diodes Incorporated
AP1509
150KHz, 2A PWM BUCK DC/DC CONVERTER
Typical Application Circuit
(1) Fixed Type Circuit
FB
12V
DC Input
3
Vin
1
AP1509
-33
4
5
6
Output
2
7
Output Load
Inductor
8
SD GNDGNDGND GND
Cin
Capacitor
3.3V/2A
L1
47uH
D1
Schottky Diode
Co
Capacitor
(2) Adjustable Type Circuit
R2 1K
R1 1K
FB
12V
DC Input
L1
39uH
3
1
Vin
2
AP1509
Output
Inductor
5 6
7 8
4
SD Gnd Gnd Gnd Gnd
Cin
Capacitor
Vout = VFB × (1 +
2.5V/2A
Output Load
R1
D1
Schottky
Diode
Co
Capacitor
)
R2
VFB = 1.23V
R2 = 1K ~ 3K
(3) Delay Start Circuit
R2 1K
12V
DC Input
FB
AP1509 Rev. 1
L1
39uH
3
Vin
CDELAY
0.1uF
Cin
Capacitor
R1 1K
RDELAY
10K
1
AP1509
4
5
6
2
7
Output
8
SD Gnd Gnd Gnd Gnd
2.5V/2A
Output Load
Inductor
D1
Schottky
Diode
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Capacitor
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)
81
80
79
Efficiency (%)
Efficiency (%)
86
85
84
83
82
81
80
79
78
77
76
75
AP1509 Efficiency vs. Temperature (Vin=12V,
Vout=3.3V, Io=2A)
78
77
76
75
74
73
-50 -30 -10 10
-50 -30 -10 10 30 50 70 90 110 130 150
Temperature (TA) (°C)
AP1509 Saturation Voltage vs. Temperature
(Vcc=12V, Vfb=0V, VSD=0)
50
70
90 110 130 150
AP1509 Switch Current Limit vs. Temperature
(Vcc = 12V, Vfb = 0V)
1.4
Switch Current Limit (A)
5.5
1.3
Saturation Voltage (V)
30
Temperature (TA) (°C)
1.2
2A
1.1
1A
1
0.5A
0.9
0.8
0.7
-50
-25
0
25
50
75
100
5
4.5
4
3.5
3
-50
125
Temperature (TA) (°C)
-30
-10
10
30
50
70
90
Temperature (TA) (°C)
15
14
13
12
11
10
9
8
7
6
5
60
Supply Current (uA)
Supply Current (mA)
AP1509 Supply Current vs. Temperature
(Vcc=12V, No Load, Von/off =0V(Switch ON) ,Von/off =5V(Switch OFF))
Switch ON
-50 -30 -10 10
30
50
70
90 110 130 150
50
45
Switch OFF
40
35
30
-50 -30 -10 10
30
50
70
90 110 130 150
Temperature (TA) (°C)
Temperature (TA) (°C)
AP1509 Rev. 1
55
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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
10
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
1.5
ON/OFF Current (nA)
Threshold Voltage (V)
1.6
1.4
1.3
1.2
1.1
1
0.9
0.8
-50 -30 -10 10
30
50
70
0
90 110 130 150
Temperature (TA) (°C)
AP1509 Frequency vs. Temperature
(Vcc=12V, Io=500mA, Vout=5V)
6
9
12
15
18
21
ON/OFF Voltage (V)
AP1509 Feedback Current vs. Temperature
(Vcc=12V, Vout=5V, Vfb=1.3V)
170
10
Feedback Current (nA)
165
Frequency (KHz)
3
160
155
150
145
140
0
-10
-20
-30
-40
-50
-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)
Vout (V)
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
AP1509 Rev. 1
0
20
40
60
80 100 120 140 160
Temperature (TA) (°C)
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AP1509
150KHz, 2A PWM BUCK DC/DC CONVERTER
Function Description
Pin Functions
+VIN
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 –
VSAT) 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.
Feedback
Senses the regulated output voltage to complete the feedback
loop.
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.
AP1509 Rev. 1
Thermal Considerations
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
o
temperature of 25 C (still air). These temperature increments are
all approximate and are affected by many factors. Higher ambient
temperatures require more heat sinker.
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.
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.
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.
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AP1509
150KHz, 2A PWM BUCK DC/DC CONVERTER
Typical Performance Characteristics
1000
900
800
700
600
500
400
300
200
100
0
-40
Feedback Voltage vs. Temperature
Vin = 5V; Vout = 15V
1.26
Feedback Voltage (V)
Frequency (KHz)
Frequency vs. Temperature
Vin = 5V; Vout = 15V
10
60
1.25
1.24
1.23
1.22
-40
110
Temperature (oC)
110
Supply Current vs. Supply Voltage
Vout = 15V; Iout = 0A
3
3
2.5
2.5
Supply Current (mA)
Supply Current (mA)
60
Temperature (oC)
Supply Current vs. Temperature
Vin = 5V; Vout = 15V; Iout = 0A
2
1.5
1
0.5
0
-40
10
2
1.5
1
0.5
0
10
60
110
Temperature (oC)
0
5
10
15
Supply Voltage (V)
Efficiency vs. Output Current
Vin = 5V; Vout = 15V
Efficiency vs. Output Current
Vin = 3.3V; Vout = 15V
90
85
Efficiency (%)
Efficiency (%)
85
80
75
75
65
55
70
0
20
40
60
Output Current (mA)
0
20
40
60
Output Current (mA)
.
AP1509 Rev. 1
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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
YY WW XX
Date Code
X: Internal code
WW: Nth week
YY: Year
Package Information
0.254
0.08/0.25
5.79/6.20
3.70/4.10
(1) SOP-8L
Gauge Plane
Seating Plane
0.38/1.27
Detail "A"
7°~9°
0.20typ
1.30/1.50
1.75max.
0.35max. 45°
0.3/0.5
1.27typ
7°~9°
Detail "A"
3.70/4.10
4.80/5.30
AP1509 Rev. 1
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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
agree to hold Diodes Incorporated and all the companies whose products are represented on our website, harmless against all damages.
LIFE SUPPORT
Diodes Incorporated products are not authorized for use as critical components in life support devices or systems without the expressed written approval of the
President of Diodes Incorporated.
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