Diodes AP1501-XXK5L-13 150khz, 3a pwm buck dc/dc converter Datasheet

AP1501
150KHz, 3A PWM BUCK DC/DC CONVERTER
General Description
Features
•
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•
•
•
•
•
•
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The AP1501 is a fully integrated step-down DC/DC converter,
with the ability to drive 3A load without the need of additional
driver components. The AP1501 operates at a switching
frequency of 150KHZ enabling the use of small size filter
components. As a result, board space is reduced and BOM costs
are lowered.
Output voltage: 3.3V, 5V, 12V and adjustable output
version
Adjustable version output voltage range, 1.23V to
37V+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 40V
Output load current: 3A
Low power standby mode
Built-in switching transistor on chip
Lead Free packages: TO263-5L and TO220-5L(R)
TO263-5L and TO220-5L(R): Available in “Green”
Molding Compound (No Br, Sb)
Lead Free Finish/RoHS Compliant (Note 1)
The AP1501 has integrated the shutdown function that allows
standby mode to be activated via an external logic signal input.
The internal compensation facilitates feedback control for line
and load regulation without the need of an external circuitry. The
AP1501 has a built-in Thermal shutdown and Current Limit
function to prevent damage from high operating temperature and
high current operating to the output switch.
Additional features include a guaranteed +/- 4% tolerance on the
output voltage under specified input and output load conditions,
and +/- 15% on oscillator frequency. The AP1501 offers both
fixed and a Adjustable output voltages. For fixed outputs the
AP1501 supports 3.3V, 5.0V and 12V. The package options
available are standard 5-lead TO263 and TO220(R) packages.
Applications
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•
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Simple High-efficiency step-down regulator
On-card switching regulators
Positive to negative converter
Ordering Information
AP1501 - XX XXX X - X
Output version
Package
Lead Free
Packing
Blank : Adjustable
33 : 3.3V
50 : 5.0V
12 : 12V
K5 : TO263-5L
T5 : TO220-5L
T5R : TO220-5L(R)
L : Lead Free
G : Green
U : Tube
13 : Tape & Reel
Device
Lead-free
Lead-free
Lead-free
Lead-free
AP1501-XXK5L-U
AP1501-XXK5L-13
AP1501-XXK5G-U
AP1501-XXK5G-13
AP1501-XXT5L-U
AP1501-XXT5G-U
AP1501-XXT5RL-U
AP1501-XXT5RG-U
Notes:
Package
Code
Packaging
(Note 2)
Quantity
K5
K5
K5
K5
T5
T5
T5R
T5R
TO263-5L
TO263-5L
TO263-5L
TO263-5L
TO220-5L
TO220-5L
TO220-5L(R)
TO220-5L(R)
50
NA
50
NA
50
50
50
50
Tube
Part Number
Suffix
-U
NA
-U
NA
-U
-U
-U
-U
13” Tape and Reel
Quantity
Part Number
Suffix
NA
800/Tape & Reel
NA
800/Tape & Reel
NA
NA
NA
NA
NA
-13
NA
-13
NA
NA
NA
NA
1. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied, see EU Directive 2002/95/EC Annex Notes.
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..
AP1501 Rev. 11
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AP1501
150KHz, 3A PWM BUCK DC/DC CONVERTER
Pin Assignments
( Top View )
( Top View )
5 SD
4 FB
3 Gnd
2 Output
1 VIN
Metal Tab GND
5 SD
4 FB
3 Gnd
2 Output
1 VIN
TO220-5L/TO220-5L(R)
TO263-5L
Pin Descriptions
Name
VIN
Output
Gnd
Description
Operating voltage input
Switching output
Ground
FB
Output voltage feedback control
SD
ON/OFF shutdown
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AP1501
150KHz, 3A PWM BUCK DC/DC CONVERTER
Block Diagram
SD
VIN
200mV
Current
Source
bias
1.235V
Reference
2.5V
Regulator
220mV
Start
up
+
Comp
_
_
Comp
+
FB
_
Frequency
compensation
+
Amp
_
Comp
+
3A
Switch
Pre-driver
Output
150kHz
OSC.
Thermal
Shutdown
Gnd
Absolute Maximum Ratings
Symbol
Parameter
ESD MM
VCC
Rating
Unit
Machine Model ESD Protection
400
V
Supply Voltage
+45
V
VSD
ON/OFF Pin input Voltage
-0.3 to +40
V
VFB
Feedback Pin Voltage
-0.3 to +40
V
VOUT
Output Voltage to Ground
-1
V
PD
Power Dissipation
Internally limited
W
TST
Storage Temperature
-65 to +150
o
TJ
Operating Junction Temperature
-20 to +125
o
C
150
o
C
TMJ
AP1501 Rev. 11
Maximum Junction Temperature
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AP1501
150KHz, 3A PWM BUCK DC/DC CONVERTER
Recommended Operating Conditions
Symbol
Parameter
Units
Rating
VOP
Operating Voltage
4.5 to 40
TA
Operating Ambient Temperature
-20 to 85
Electrical Characteristics
V
o
C
(All Output Voltage Versions)
Unless otherwise specified, VIN = 12V for 3.3V, 5V, adjustable version and VIN = 24V 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
Conditions
VFB = 1.3V
Feedback Bias Current
(Adjustable version only)
FOSC
Oscillator Frequency
VSAT
Saturation Voltage
DC
Max. Duty Cycle(ON)
Min. Duty cycle(OFF)
ICL
Current Limit
IL
IQ
ISTBY
VIL
VIH
IH
IL
θJA
θJC
Notes:
Output
Leakage
Output = -1 Current
Quiescent Current
Standby Quiescent
Current
Output = 0
IOUT = 3A
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 (Note 3)
VIN = 40V
VFB = 12V force driver off
ON/OFF pin = 5V
VIN = 40V
Low (regulator ON)
Thermal Resistance
unction to Ambient
Thermal Resistance
Junction to Case
Typ.
40
127
110
ON/OFF pin Logic Input
Threshold Voltage
High (regulator OFF)
ON/OFF Pin Logic
Input Current
ON/OFF Pin Input
Current
Min
150
1.3
Max
60
100
173
173
1.4
Unit
nA
KHZ
V
1.5
100
0
%
5.5
3.6
4.0
2
5
150
2.0
A
6.5
200
uA
60
10
250
350
0.6
mA
mA
uA
V
1.3
VLOGIC = 2.5V (OFF)
15
25
VLOGIC = 0.5V (ON)
0.02
5
TO263-5L (Note 4)
37
TO220-5L(R) (Note 4)
31
TO263-5L (Note 4)
6
uA
TO220-5L(R) (Note 4)
o
C/W
o
C/W
5
3. Feedback pin removed from output and connected to 0V to force the output transistor switch ON. Feedback pin removed from output and
connected to 12V for the 3.3V, 5V, and the ADJ. version, and 15V for the 12V version, to force the output transistor switch OFF.
4. Test condition: Device mounted with copper area of approximately 3 in2,1oz, no air flow.
AP1501 Rev. 11
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AP1501
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.
Symbol
Parameter
VFB
Output
Feedback
4.5V < VIN < 40V
1.193
0.2A < ILOAD < 3A
1.18
VOUT programmed for 3V
η
Efficiency
VIN = 12V, ILOAD = 3A
VOUT
Output Voltage
η
Efficiency
VOUT
Output Voltage
η
Efficiency
VOUT
Output Voltage
η
Efficiency
AP1501-ADJ
AP1501-3.3V
AP1501-5V
AP1501-12V
AP1501 Rev. 11
Conditions
4.75V < VIN < 40V
0.2A < ILOAD < 3A
VMin
3.168
3.135
VIN = 15V, ILOAD = 3A
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Unit
1.23
1.267
1.28
V
3.3
%
3.432
3.465
73
4.8
4.75
VIN = 12V, ILOAD = 3A
15V < VIN < 40V
0.2A < ILOAD < 3A
VMax
73
VIN = 12V, ILOAD = 3A
7V < VIN < 40V
0.2A < ILOAD < 3A
Typ.
5
%
5.2
5.25
80
11.52
11.4
12
90
V
V
%
12.48
12.6
V
%
JANUARY 2009
© Diodes Incorporated
AP1501
150KHZ, 3A PWM BUCK DC/DC CONVERTER
Typical Performance Characteristics
Typical Performance Characteristics
Normalized Output Voltage
Efficiency
100
5.10
OUTPUT VOLTAGE (V)
VIN =20V, I LOAD=3A
Normalized at TJ=25oC
95
EFFICIENCY (%)
5.05
5.00
4.95
3A Load
90
85
5V
80
75
3.3V
70
4.90
65
-50
-25
0
25
50
75
100
125
8
10
Switch Saturation Voltage
35
40
Switch Current Limit
1 : -40 oC
2 : 25 oC
3 : 125 oC
1.40
SWITCH CURRENT LIMIT (A)
SATURATION VOLTAGE (V)
30
25
5.50
1.60
1.20
1.00
1
0.80
VIN=12V, VOUT=5V
5.00
4.50
4.00
2
3
3.50
0.5
2
1
3
-50
-25
25
50
75
100 125
Shutdown Quiescent Current
Operating Quiescent Current
20.0
160.0
CURRENT (uA)
25.0
200.0
15.0
Switch ON
10.0
Switch OFF
5.0
0
JUNCTION TEMPERATURE( oC)
SWITCH CURRENT(A)
SUPPLY CURRENT (mA)
20
JUNCTION TEMPERATURE( oC)
JUNCTION TEMPERATURE( oC)
0.60
15
120.0
80.0
1
2
VON/OFF=5V
1 : -40 oC
2 : 25 oC
3 : 125 oC
3
40.0
0.0
-50
-25
0
25
50
75
100
125
JUNCTION TEMPERATURE( oC)
AP1501 Rev. 11
0.0
10
20
30
40
SUPPLY VOLOTAGE (V)
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AP1501
150KHz, 3A PWM BUCK DC/DC CONVERTER
Typical Performance Characteristics
(Continued)
ON/OFF Threshold Voltage
Minimum Operating Supply Voltage
5.0
THRESHOLD VOLTAGE (V)
SUPPLY VOLTAGE (V)
5.0
4.0
3.0
2.0
1.0
VOUT=1.23V
ILOAD=120mA
-50 -25
0
25
50
2.0
1.0
-50 -25
75 100 125
0
25
50
75 100 125
JUNCTION TEMPERATURE (oC)
JUNCTION TEMPERATURE (oC)
ON/OFF Pin Current (Sinking)
Switch Frequency
200.0
150.0
VIN=40V
-40oC ≤ TJ ≤ 125oC
FREQUENCY (kHz)
CURRENT (uA)
3.0
0.0
0.0
120.0
4.0
90.0
60.0
150.0
100.0
50.0
30.0
0.0
0.0
1.4
5
10
15
20 22
23
24
25
-50 -25
0
25
50
75
100
125
o
JUNCTION TEMPERATURE ( C)
ON/OFF PIN VOLTAGE (V)
Feedback Pin Bias Current
BIAS CURRENT (nA)
50.0
40.0
30.0
20.0
Adjustable Version Only
10.0
0.0
-50 -25
0
25
50
75
100 125
o
JUNCTION TEMPERATURE( C)
AP1501 Rev. 11
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AP1501
150KHz, 3A PWM BUCK DC/DC CONVERTER
Typical Application Circuit
(1) Fixed Type Circuit
FB
12V
DC Input
L1
33uH
4
Vin
AP1501
-33
1
5
2
3.3V/3A
Output Load
Inductor
3
Gnd
SD
Cin
Capacitor
Output
Co
Capacitor
D1
B340A
(2) Adjustable Type Circuit
R1
R2
FB
12V
DC Input
L1
47uH
4
Vin
1
AP1501
5
SD
Cin
Capacitor
2
Output
5V/ 3A
Output Load
3
Gnd
Vout = VFB × (1 +
D1
(Note 5)
R1
Co
Capacitor
)
R2
VFB = 1.23V
R2 = 1K ~ 3K
(3) Delay Start Circuit
R2
R1
FB
12V
DC Input
4
Vin
Cin
Capacitor
Notes:
CDELAY
0.1uF
1
AP1501
5
2
Output
L1
47uH
5V/ 3A
Output Load
3
SD
RDELAY
10K
Gnd
D1
(Note 5)
Co
Capacitor
5. Suggested DIODES Power Schottky: B340A or PDS340 series.
AP1501 Rev. 11
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AP1501
150KHz, 3A PWM BUCK DC/DC CONVERTER
Functional Description
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 a minimum.
Feedback
Senses the regulated output voltage to complete the feedback
loop.
ON/OFF
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 40V) shuts the regulator down.
If this shutdown feature is not needed, the ON/OFF pin can be
wired to the ground pin or it can be left open, in either case the
regulator will be in the ON condition.
Thermal Considerations
The AP1501 is available in 5-pin surface mount TO-263 and
TO-220.
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 be aware that there are many factors that can affect the
junction temperature. When load currents higher than 2A are
used, double sided or multilayer 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, multilayer 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.
The TO-220 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
AP1501 junction temperature rises above ambient temperature
for a 3A load and different input and output voltages. The data
for these curves was taken with the AP1501 (TO-220 package)
operating as a buck switching regulator in an ambient
o
temperature of 25 C (still air). These temperature rise numbers
are all approximate and there are many factors that can affect
these temperatures. Higher ambient temperatures require more
heat sinking.
The TO-263 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
2
soldered to should be at least 0.4 in , and ideally should have
2 or more square inches of 2 oz. Additional copper area improves
the thermal characteristics, but 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, multilayer PC boards with large copper areas and/or
airflow are recommended.
The AP1501 (TO-263 package) junction temperature rises above
ambient temperature with a 2A 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
AP1501 Rev. 11
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AP1501
150KHz, 3A PWM BUCK DC/DC CONVERTER
Marking Information
(1) TO263-5L
( Top View )
Logo
Output Type :
1501 : ADJ
1501-33 : 3.3V
1501-50 : 5.0V
1501-12 : 12V
1501-XX
YY WW X X
L : Lead Free
G : Green
ID code
Xth week : 01~52
Year : "07" = 2007
"08" = 2008
~
(2) TO220-5L(R)
( Top view )
Logo
Output Type :
1501: ADJ
1501-33: 3.3V
1501-50: 5.0V
1501-12: 12V
1501-XX
YY WW X X
L : Lead Free
G : Green
ID code
Xth week : 01~52
Year : "07" = 2007
"08" = 2008
~
AP1501 Rev. 11
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AP1501
150KHz, 3A PWM BUCK DC/DC CONVERTER
Package Information
(1) Package Type: TO263-5L
(2) Package Type: TO220-5L
AP1501 Rev. 11
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AP1501
150KHz, 3A PWM BUCK DC/DC CONVERTER
Package Information
(Continued)
(3) Package Type: TO220-5L(R) Mechanical drawing
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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