Anachip AP1501A-12K5A 150khz, 5a pwm buck dc/dc converter Datasheet

AP1501A
150Khz, 5A PWM Buck DC/DC Converter
„ Features
„ General Description
- 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: 5A
- TO220-5L, TO220-5L(R) and TO263-5L packages
- Low power standby mode
- Built-in switching transistor on chip
The AP1501A series are monolithic IC that design
for a step-down DC/DC converter, and own the
ability of driving a 5A 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. The AP1501A 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 5-lead TO-220 package and
a 5-lead TO-263.
„ Applications
- Simple High-efficiency step-down regulator
- On-card switching regulators
- Positive to negative converter
„ Pin Descriptions
„ Pin Assignments
Name
( Top View )
Metal Tab GND
VIN
5 SD
4 FB
3 Gnd
2 Output
1 VIN
Output
Gnd
TO263-5L
Description
Operating voltage input
Switching output
Ground
FB
Output voltage feedback control
SD
ON/OFF shutdown
( Top View )
5 SD
4 FB
3 Gnd
2 Output
1 VIN
TO220-5L/TO220-5L(R)
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.1.2 Aug 23, 2005
1/12
AP1501A
150Khz, 5A PWM Buck DC/DC Converter
„ Ordering Information
AP1501A XX X X X
Package
Output version
Blank : Adjustable
-33 : 3.3V
-50 : 5.0V
-12 : 12V
Lead Free
Packing
Blank : Normal
T5: TO220-5L
T5R: TO220-5L(R) L : Lead Free Package
K5: TO263-5L
Blank : Tube
A : Taping
„ Block Diagram
SD
VIN
200mV
Current
Source
bias
1.235V
Reference
2.5V
Regulator
220mV
Start
up
+
Comp
_
_
Comp
+
_
Amp
Freg.
Compensation
_
+
FB
Comp
+
Pre-driver
5A
Switch
Output
150kHz
OSC.
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Thermal
Shutdown
Gnd
Rev.1.2 Aug 23, 2005
2/12
AP1501A
150Khz, 5A PWM Buck DC/DC Converter
„ Absolute Maximum Ratings
Symbol
Parameter
Rating
Unit
+45
V
V
VCC
Supply Voltage
VSD
ON/OFF Pin input voltage
-0.3 to +40
VFB
Feedback Pin voltage
-0.3 to +40
V
VOUT
Output voltage to Ground
-1
V
PD
TST
Power dissipation
Internally limited
Storage temperature
W
-65 to +150
o
C
o
C
TOP
Operating temperature
-40 to +125
VOP
Operating voltage
+4.5 to +40
V
„ Electrical Characteristics (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
Symbol
IFB
Parameter
Feedback Bias Current
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
Output
Leakage
Output =-1V Current
Quiescent Current
Standby Quiescent
Current
Output = 0V
ON/OFF Pin Logic Input
Threshold Voltage
ON/OFF Pin Logic
Input Current
ON/OFF Pin Input
Current
θJC
Thermal Resistance
θJA
Thermal Resistance
with Copper Area of
Approximately 3 in2
Conditions
VFB=1.3V
(Adjustable version only)
Min.
40
127
110
IOUT=5A
no outside circuit
VFB=0V force driver on
VFB=0V force driver on
VFB=12V force driver off
peak current
no outside circuit
VFB=0 force driver on
no outside circuit
VFB=12 force driver off
VIN=40V
VFB=12 force driver off
ON/OFF pin=5V
VIN=40V
Low (regulator ON)
High (regulator OFF)
Typ.
150
1.5
Max.
60
100
173
173
1.6
6.5
5.5
6.0
2
5
150
2.0
200
uA
60
10
250
300
0.6
mA
mA
uA
1.3
V
0.02
5
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A
7.5
VLOGIC=0.5V (ON)
TO263-5L
V
%
25
Junction to
Ambient
Khz
100
0
15
Junction to
Case
nA
1.7
VLOGIC=2.5V (OFF)
TO220-5L
TO263-5L
TO220-5L
Unit
uA
2.5
3.5
28
23
o
C/W
o
C/W
Rev.1.2 Aug 23, 2005
3/12
AP1501A
150Khz, 5A PWM Buck DC/DC Converter
„ Electrical Characteristics (Continued)
AP1501A-ADJ
AP1501A-3.3V
AP1501A-5V
AP1501A-12V
Symbol
Parameter
Conditions
Typ.
Limit
Unit
VFB
Output
Feedback
5V < VIN < 40V
0.2A < ILOAD < 5A
VOUT programmed for
3V
1.23
1.193/1.18
1.267/1.28
V
VMIN
VMAX
η
Efficiency
VIN = 12V, ILOAD=5A
72
VOUT
Output Voltage
5.5V < VIN < 40V
0.2A < ILOAD < 5A
3.3
η
Efficiency
VIN = 12V, ILOAD=5A
71
VOUT
Output Voltage
8V < VIN < 40V
0.2A < ILOAD < 5A
5
η
Efficiency
VIN = 12V, ILOAD=5A
78
VOUT
Output Voltage
15V < VIN < 40V
0.2A < ILOAD < 5A
12
η
Efficiency
VIN = 16V, ILOAD = 5A
88
%
3.168/3.135
3.432/3.465
V
VMIN
VMAX
%
4.8/4.75
5.2/5.25
V
VMIN
VMAX
%
11.52/11.4
12.48/12.6
V
VMIN
VMAX
%
Specifications with boldface type are for full operating temperature range, the other type are for TJ=25ºC.
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Rev.1.2 Aug 23, 2005
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AP1501A
150Khz, 5A PWM Buck DC/DC Converter
„ Typical Performance Characteristics
Typical Performance Characteristics
Normalized Output Voltage
Efficiency
100
VIN =20V, I LOAD=3A
Normalized at TJ=25oC
95
5.05
EFFICIENCY (%)
OUTPUT VOLTAGE CHANGE
5.10
5.00
4.95
85
-50
-25
0
25
50
75
100
5V
80
75
70
4.90
5A Load
90
3.3V
65
125
8
10
15
JUNCTION TEMPERATURE( C)
Switch Saturation Voltage
1.5
1.4
1
1.3
1.2
40
VIN=12V, VOUT=5V
7.0
6.5
6.0
2
3
5.5
2.0
4
3
5
-50
-25
200.0
20.0
160.0
CURRENT (uA)
25.0
Switch ON
10.0
Switch OFF
5.0
25
50
75
100 125
Shutdown Quiescent Current
Operating Quiescent Current
15.0
0
JUNCTION TEMPERATURE( oC)
SWITCH CURRENT(A)
SUPPLY CURRENT (mA)
35
7.5
1 : -40 oC
2 : 25 oC
3 : 125 oC
1.6
30
25
Switch Current Limit
SWITCH CURRENT LIMIT (A)
SATURATION VOLTAGE (V)
1.7
20
Input Voltage
o
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
JUNCTION
25
50
75
100
125
0.0
TEMPERATURE( oC)
10
20
30
40
SUPPLY VOLOTAGE (V)
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AP1501A
150Khz, 5A 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
75 100 125
-50 -25
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
-50 -25
25
0
25
50
75
100
125
JUNCTION TEMPERATURE (oC)
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)
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Rev.1.2 Aug 23, 2005
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AP1501A
150Khz, 5A PWM Buck DC/DC Converter
„ Typical Application Circuit
(1) Fixed Type Circuit
FB
12V
DC Input
L1
18uH
4
Vin
AP1501A
2
-33
1
5
3.3V/5A
Output Load
Inductor
3
SD
Cin
Capacitor
Output
D1
Schottky
Diode
Gnd
Co
Capacitor
(2) Adjustable Type Circuit
R1
R2
FB
12V
DC Input
L1
22uH
4
1
Vin
AP1501A 2
5
SD
Cin
Capacitor
Output
5V/ 5A
Output Load
3
Gnd
Vout = VFB × (1 +
D1
Schottky Diode
R1
R2
Co
Capacitor
)
VFB = 1.23V
R2 = 1K ~ 3K
(3) Delay Start Circuit
R2
R1
FB
12V
DC Input
4
Vin
Cin
Capacitor
CDELAY
0.1uF
1
AP1501A 2
5
Output
L1
22uH
5V/ 5A
Output Load
3
SD
RDELAY
10K
Gnd
D1
Schottky Diode
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Co
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Rev.1.2 Aug 23, 2005
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AP1501A
150Khz, 5A PWM Buck DC/DC Converter
„ Function Description
temperature rise numbers are all approximate and
there are many factors that can affect these
temperatures. Higher ambient temperatures require
more heat sinking.
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.
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 soldered to should be at least 0.8 in2,
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
approximately 6 in2, only small improvements in
heat dissipation are realized. If further thermal
improvements are needed, double sided, multilayer
PC board with large copper areas and/or airflow are
recommended.
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.
The AP1501A (TO-263 package) junction
temperature rise 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 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 3A 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.
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 AP1501A is available in two packages, a 5-pin
TO-220 and a 5-pin surface mount TO-263.
For the best thermal performance, wide copper
traces and generous amounts of printed circuit
board copper should be used in the board layout.
(Once 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.
The TO-220 package needs a heat sink under most
conditions. The size of the heatsink depends on the
input voltage, the output voltage, the load current
and the ambient temperature. The AP1501A
junction temperature rises above ambient
temperature for a 5A load and different input and
output voltages. The data for these curves was
taken with the AP1501A (TO-220 package)
operating as a buck switching regulator in an
ambient temperature of 25oC (still air). These
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Rev.1.2 Aug 23, 2005
8/12
AP1501A
150Khz, 5A PWM Buck DC/DC Converter
„ Function Description (Continued)
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.
„ Marking Information
(2) TO220-5L
(1) TO263-5L
( Top view )
( Top view )
Output Type:
1501: ADJ
1501A33: 3.3V
1501A50: 5.0V
1501A12: 12V
1501AXX
YY WW X X
Output Type:
1501: ADJ
1501A33: 3.3V
1501A50: 5.0V
1501A12: 12V
1501AXX
YY WW X X
Blank: normal
L: Lead Free Package
ID code
Xth week: 01~52
Year: "01" = 2001
"02" = 2002
~
Logo
Blank: normal
L: Lead Free Package
ID code
Xth week: 01~52
Year: "01" = 2001
"02" = 2002
Logo
~
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Rev.1.2 Aug 23, 2005
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AP1501A
150Khz, 5A PWM Buck DC/DC Converter
„ Package Information
(1) Package Type: TO220-5L
E
A
F
L
D
H1
Q
ΦP
b
e
C
J1
e1
Symbol
A
b
C
D
E
e
e1
F
H1
J1
L
Øp
Q
Dimensions In Millimeters
Min.
Nom.
Max.
4.07
4.45
4.82
0.76
0.89
1.02
0.36
0.50
0.64
14.22
14.86
15.50
9.78
10.16
10.54
1.57
1.71
1.85
6.68
6.81
6.93
1.14
1.27
1.40
5.46
6.16
6.86
2.29
2.74
3.18
13.21
13.97
14.73
3.68
3.81
3.94
2.54
2.73
2.92
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Dimensions In Inches
Min.
Nom.
Max.
0.160
0.030
0.014
0.175
0.035
0.020
0.190
0.040
0.025
0.560
0.385
0.062
0.263
0.045
0.215
0.090
0.520
0.145
0.100
0.585
0.400
0.067
0.268
0.050
0.243
0.108
0.550
0.150
0.107
0.610
0.415
0.073
0.273
0.055
0.270
0.125
0.580
0.155
0.115
Rev.1.2 Aug 23, 2005
10/12
AP1501A
150Khz, 5A PWM Buck DC/DC Converter
„ Package Information (Continued)
(2) Package Type: TO263-5L
E
2.5
L
D
15.7
9.1
L2
10.9
1.0
1.7
B
C2
A
Land Pattern Recommendation (Unit: mm)
C
e
L1
Symbol
A
B
C
C2
D
E
e
L
L1
L2
Dimensions In Millimeters
Min.
Nom.
Max.
4.07
4.46
4.85
0.66
0.84
1.02
0.36
0.50
0.64
1.14
1.27
1.40
8.65
9.15
9.65
9.78
10.16
10.54
1.57
1.71
1.85
14.61
15.24
15.88
2.29
2.54
2.79
2.92
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Dimensions In Inches
Min.
Nom.
Max.
0.160
0.176
0.191
0.026
0.033
0.040
0.014
0.020
0.025
0.045
0.050
0.055
0.341
0.360
0.380
0.385
0.400
0.415
0.062
0.068
0.073
0.575
0.600
0.625
0.090
0.100
0.110
0.115
Rev.1.2 Aug 23, 2005
11/12
AP1501A
150Khz, 5A PWM Buck DC/DC Converter
„ Package Information (Continued)
(3) Package Type: TO220-5L(R) Mechanical drawing
A
E
F
Q
H1
D
d1
H2
H3
d2
J1
b
J2
e
J3
J3
J2
A
J1
E
Symbol
A
b
D
d1
d2
E
e
F
H1
H2
H3
J1
J2
J3
Q
Dimensions In Millimeters
Min.
Nom.
Max.
4.4
4.6
4.7
0.7
0.8
0.9
8.4
8.7
8.9
1.0
6.3
9.91
10.16
10.41
1.6
1.7
1.8
1.2
1.25
1.3
6.4
20.8
21.6
22.4
23.9
24.7
25.5
2.7
3.7
4.5
5.3
8.4
2.5
2.8
3.0
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Dimensions In Inches
Min.
Nom.
Max.
0.175
0.180
0.185
0.027
0.032
0.037
0.330
0.340
0.350
0.039
0.248
0.390
0.400
0.410
0.062
0.067
0.072
0.048
0.050
0.052
0.250
0.820
0.850
0.880
0.942
0.972
1.002
0.105
0.147
0.177
0.207
0.331
0.100
0.110
0.120
Rev.1.2 Aug 23, 2005
12/12
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