Diodes AP1507-33D5L-U 150khz, 3a pwm buck dc/dc converter Datasheet

AP1507
150KHz, 3A 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: 3A
Lead Free Package: TO252-5L
Low Power Standby Mode
Built-in Switching Transistor On Chip
Lead Free Package: TO252-5L
Lead Free Finish/RoHS Compliant (Note 1)
•
The AP1507 is a monolithic IC designed for a step-down DC/DC
converter and is capable of driving a 3A load without an external
transistor. Due to reducing the number of external components,
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 the feedback
control have good line and load regulation without an external
design. Regarding the protected function, the thermal shutdown
is to prevent over temperature operating from damaging the
device, and current limit is against over current operating of the
output switch. If the current limit function occurred and VFB 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 a fixed 3.3V,
5V, 12V, and an adjustable type. AP1507 is available in a 5-lead
TO-252 lead-free package.
Applications
•
•
•
Simple High-Efficiency Step-Down Regulator
On-Card Switching Regulators
Positive to Negative Converter
Ordering Information
AP1507 - XX X X X
Note:
1.
Output Version
Package
Lead Free
Packing
Blank : Adjustable
33 : 3.3V
50 : 5.0V
12 : 12V
D5: TO252-5L
L : Lead Free
-U : Tube
-13 : Taping
RoHS revision 13.2.2003. Glass and High Temperature Solder Exemptions Applied, see EU Directive Annex Notes 5 and 7.
Lead-free
Device
Package
Code
Packaging
(Note 2)
AP1507-XXD5
D5
TO252-5L
Tube/Bulk
Part Number
Quantity
Suffix
80
-U
13” Tape and Reel
Part Number
Quantity
Suffix
2500/Tape & Reel
Note: 2. 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.
AP1507 Rev. 1
1 of 10
www.diodes.com
FEBRUARY 2007
© Diodes Incorporated
-13
AP1507
150KHz, 3A PWM BUCK DC/DC CONVERTER
Pin Descriptions
Pin Assignments
(Top View)
Name
Description
VIN
5 SD
4 FB
3 GND
2 Output
1 VIN
Operating Voltage Input
Output
GND
Metal Tab GND
Switching Output
Ground
FB
Output Voltage Feedback Control
SD
ON /OFF Shutdown
TO252-5L
Block Diagram
SD
VIN
200mV
Current
Source
Bias
1.235V
Reference
2.5V
Regulator
220mV
Start
Up
+
Comp
_
_
Comp
+
+
Amp
_
Frequency
Compensation
_
FB
PreDriver
Comp
+
3A
Switch
Output
150kHz
OSC.
AP1507 Rev. 1
2 of 10
www.diodes.com
Thermal
Shutdown
GND
FEBRUARY 2007
© Diodes Incorporated
AP1507
150KHz, 3A PWM BUCK DC/DC CONVERTER
Absolute Maximum Ratings
Symbol
VCC
VSD
VFB
VOUT
PD
TST
TOP
VOP
Parameter
Supply Voltage
ON /OFF Pin Input Voltage
Feedback Pin Voltage
Output Voltage to Ground
Power Dissipation
Storage Temperature
Operating Temperature
Operating Voltage
Electrical Characteristics
Rating
+24
Unit
V
-0.3 to +18
V
-0.3 to +18
-1
Internally Limited
-65 to +150
-40 to +125
+4.5 to +22
V
V
W
o
C
o
C
V
(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
FOSC
FSCP
VSAT
DC
ICL
ILEAK
IQ
ISTBY
VIL
VIH
Parameter
Feedback Bias Current
Conditions
VFB = 1.3V
( Adjustable Version Only )
Oscillator Frequency
When current limit Occurred
and VFB < 0.5V, Ta = 25 oC
IOUT = 3A
Saturation Voltage
No Outside Circuit
VFB = 0V Force Driver On
Max. Duty Cycle (ON)
VFB = 0V Force Driver On
Min. Duty Cycle (OFF)
VFB = 12V Force Driver Off
Peak Current
Current Limit
No Outside Circuit
VFB = 0V Force Driver On
Output No Outside Circuit
Output = 0V
leakage VFB =12V Force Driver Off
current VIN = 22V
Output = -1V
Quiescent Current
VFB = 12V Force Driver Off
Standby Quiescent
ON /OFF Pin = 5V
Current
VIN = 22V
ON /OFF Pin Logic Input Low (Regulator ON)
High (Regulator OFF)
Threshold Voltage
Oscillator Frequency of
Short Circuit Protect
IH
ON /OFF Pin Logic Input
Current
IL
ON /OFF Pin Input Current VLOGIC = 0.5V (ON)
Junction to
Thermal Resistance
TO252-5L
Case
Thermal Resistance
Junction to
TO252-5L
with copper area of
Ambient
approximately 2cm ×2cm
ΘJC
ΘJA
AP1507 Rev. 1
Min.
Typ.
-10
127
110
150
10
30
Unit
50
KHz
nA
KHz
1.6
1.4
V
1.7
100
0
3.6
4.5
%
5.5
A
6.5
-200
-5
5
70
2.0
1.3
VLOGIC = 2.5V (OFF)
3 of 10
www.diodes.com
Max.
-50
-100
173
173
uA
mA
mA
10
150
200
0.6
-
uA
V
-0.01
-0.1
uA
-1
10
o
50
o
C/W
C/W
FEBRUARY 2007
© Diodes Incorporated
AP1507
150KHz, 3A 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.
AP1507-ADJ
AP1507-3.3V
AP1507-5V
AP1507-12V
AP1507 Rev. 1
Symbol
Parameter
Conditions
VMin
Typ
VMax
Unit
VFB
Output
Feedback
5V < VIN < 22V
0.2A < ILOAD < 3A
VOUT Programmed for
3V
1.193
1.18
1.23
1.267
1.28
V
η
Efficiency
VIN = 12V, ILOAD = 3A
VOUT
Output
Voltage
5.5V < VIN < 22V
0.2A < ILOAD < 3A
η
Efficiency
VIN = 12V, ILOAD = 3A
VOUT
Output
Voltage
8V < VIN < 22V
0.2A < ILOAD < 3A
η
Efficiency
VIN = 12V, ILOAD = 3A
VOUT
Output
Voltage
15V < VIN < 22V
0.2A < ILOAD < 3A
η
Efficiency
VIN = 16V, ILOAD = 3A
4 of 10
www.diodes.com
74
3.168
3.135
3.3
%
3.432
3.465
75
4.8
4.75
5
%
5.2
5.25
80
11.52
11.4
12
89
V
V
%
12.48
12.6
V
%
FEBRUARY 2007
© Diodes Incorporated
AP1507
150KHz, 3A PWM BUCK DC/DC CONVERTER
Typical Performance Characteristics
AP1507 Efficiency vs. Temperature
(Vin = 12V, Vout = 3.3V, Io = 3A)
78
83
82
81
80
79
78
77
76
75
74
73
72
77
76
Efficiency (%)
Efficiency (%)
AP1507 Efficiency vs. Temperature
(Vin = 12V, Vout = 5V, Io = 3A)
75
74
73
72
71
70
-50 -30 -10 10
30
50
70
90 110 130 150
-50 -30 -10 10
Temperature (TA) (°C)
AP1507 Saturation Voltage vs. Temperature
(Vcc = 12V, Vfb = 0V, VSD = 0)
50
70
90 110 130 150
AP1507 Switch Current Limit vs. Temperature
(Vcc = 12V, Vfb = 0V)
1.6
Switch Current Limit (A)
5.5
1.5
Saturation Voltage (V)
30
Temperature (TA) (°C)
3A
1.4
1.3
2A
1.2
1A
1.1
0.5A
1
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)
AP1507 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)
AP1507 Rev. 1
55
5 of 10
www.diodes.com
FEBRUARY 2007
© Diodes Incorporated
AP1507
150KHz, 3A PWM BUCK DC/DC CONVERTER
Typical Performance Characteristics (Continued)
AP1507 Threshold Voltage vs. Temperature
(Vcc = 12V, Io = 100mA)
AP1507 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)
10
165
0
155
150
145
9
12
15
18
21
AP1507 Feedback Current vs. Temperature
(Vcc = 12V, Vout = 5V, Vfb = 1.3V)
170
160
6
ON/OFF Voltage (V)
Feedback Current (nA)
Frequency (KHz)
AP1507 Frequency vs. Temperature
(Vcc = 12V, Io = 500mA, Vout = 5V)
3
-10
-20
-30
-40
-50
140
-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)
AP1507 Output Voltage vs. Temperature
(Vin = 12V, Io = 3A)
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
AP1507 Rev. 1
0
20
40
60
80 100 120 140 160
Temperature (TA) (°C)
6 of 10
www.diodes.com
FEBRUARY 2007
© Diodes Incorporated
AP1507
150KHz, 3A PWM BUCK DC/DC CONVERTER
Typical Application Circuit
(1) Fixed Type Circuit
FB
12V
DC Input
L1
33uH
4
AP1507
-33
1
Vin
5
2
3.3V/3A
Output Load
Inductor
3
D1
Schottky
Diode
GND
SD
Cin
Capacitor
Output
Co
Capacitor
(2) Adjustable Type Circuit
R1
R2
FB
12V
DC Input
L1
47uH
4
1
Vin
5
SD
Cin
Capacitor
2
AP1507
Output
5V/ 3A
Output Load
3
GND
Vout = VFB × (1 +
R1
D1
Schottky Diode
Co
Capacitor
)
R2
VFB = 1.23V
R2 = 1K ~ 3K
(3) Delay Start Circuit
R2
R1
FB
12V
DC Input
Vin
Cin
Capacitor
AP1507 Rev. 1
L1
47uH
4
CDELAY
0.1uF
1
2
AP1507
5
Output
5V/ 3A
Output Load
3
SD
RDELAY
10K
GND
D1
Schottky Diode
7 of 10
www.diodes.com
Co
Capacitor
FEBRUARY 2007
© Diodes Incorporated
AP1507
150KHz, 3A PWM BUCK DC/DC CONVERTER
Applications Information
Pin Functions
+VIN
This is the positive input supply for the IC switching regulator. A
suitable input bypass capacitor must be present 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 kept at a minimum.
Feedback (FB)
Senses the regulated output voltage to complete the feedback
loop.
ON /OFF (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 ON /OFF pin can be
wired to the ground pin.
Thermal Considerations
The TO-252 surface mount package tab is designed to be
soldered to the copper on a printed circuit board. The copper
and the board are the heat sink for this package and the other
heat producing components, such as the catch diode and
inductor. The PC board copper area that the package is soldered
2
to should be at least 0.8 in , and ideally should have 2 or more
square inches of 2 oz. additional copper area which improves the
thermal characteristics. With copper areas greater than
2
approximately 6 in , only small improvements in heat dissipation
are realized. If further thermal improvements are needed, double
sided, multi-layer PC board with large copper areas and/or airflow
will be recommended.
AP1507 Rev. 1
The AP1507 (TO-252 package) junction temperature rises above
ambient temperature with a 3A load for various input and output
voltages. This data was taken with the circuit operating as a
buck-switching regulator with all components mounted on a PC
board to simulate the junction temperature under actual operating
conditions. This curve can be used for a quick check for the
approximate junction temperature for various conditions, but
there are many factors that can affect the junction temperature.
When load currents higher than 3A are used, double sided or
multi-layer PC boards with large copper areas and/or airflow
might be needed, especially for high ambient temperatures and
high output voltages.
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 to this 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 rise
numbers are all approximate, and there are many factors that will
affect these numbers. 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.
8 of 10
www.diodes.com
FEBRUARY 2007
© Diodes Incorporated
AP1507
150KHz, 3A PWM BUCK DC/DC CONVERTER
Marking Information
TO252-5L
(Top view)
Part Number
Output Type:
Blank: Adjustable
33: 3.3V
50: 5.0V
12: 12V
1507 - XX
X X X X XX
Logo
L: Lead Free Package
ID Code
Xth Week:01~52
Year: "01" = 2001
"02" = 2002
~
Package Information ( in mm )
Package Type: TO252-5L
AP1507 Rev. 1
9 of 10
www.diodes.com
FEBRUARY 2007
© Diodes Incorporated
AP1507
150KHz, 3A 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.
AP1507 Rev. 1
10 of 10
www.diodes.com
FEBRUARY 2007
© Diodes Incorporated
Similar pages