Anachip AP1506-50K5LA 150khz, 3a pwm buck dc/dc converter Datasheet

AP1506
150KHz, 3A 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
18V+4%
- 150KHz +15% fixed switching frequency
- Voltage mode non-synchronous PWM control
- Thermal-shutdown and current-limit protection
The AP1506 series are monolithic IC designed for a
step-down DC/DC converter, and own the ability of
driving a 3A load without external transistor. 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 to prevent over current operating
of the output switch. If current limit function
occurred and VFB is down to 0.5V below, the
switching frequency will be reduced. The AP1506
series operate 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 or a 5-lead
TO-263.
- ON /OFF shutdown control input
- Operating voltage can be up to 22V
- Output load current: 3A
- TO220-5L and TO263-5L packages
- Low power standby mode
- Built-in switching transistor on chip
„ Applications
- Simple High-efficiency step-down regulator
- On-card switching regulators
- Positive to negative converter
„ Pin Assignments
„ Pin Descriptions
( Top View )
Metal Tab GND
Name
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
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.1.1 Oct 29, 2004
1/12
AP1506
150KHz, 3A PWM Buck DC/DC Converter
„ Ordering Information
AP1506 XX X X X
Package
Output version
Blank : Adjustable
-12 : 12V
-33 : 3.3V
-50 : 5.0V
Lead Free
Packing
Blank : Tube
T5: TO220-5L
Blank : Normal
K5: TO263-5L
L : Lead Free Package A : Taping
T5R: TO220-5L(R)
„ Block Diagram
SD
VIN
200mV
Current
Source
bias
1.235V
Reference
2.5V
Regulator
220mV
Start
up
+
Comp
_
_
Comp
+
FB
_
Amp
Frequecy
compensation
_
+
Comp
+
Pre-driver
3A
Switch
Output
150kHz
OSC.
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Thermal
Shutdown
Gnd
Rev.1.1 Oct 29, 2004
2/12
AP1506
150KHz, 3A PWM Buck DC/DC Converter
„ Absolute Maximum Ratings
Symbol
VCC
VSD
VFB
VOUT
PD
TST
TOP
VOP
Parameter
Rating
Supply Voltage
ON /OFF Pin input voltage
Feedback Pin voltage
Output voltage to Ground
Power dissipation
Storage temperature
Operating temperature
Operating voltage
Unit
+24
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
„ 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
Symbol
IFB
Parameter
Feedback bias current
FOSC
Oscillator frequency
FSCP
Oscillator frequency
short circuit protect
VSAT
DC
ICL
IL
IQ
ISTBY
VIL
VIH
Conditions
VFB=1.3V
(Adjustable version only)
of When current limit occurred
o
and VFB < 0.5V, Ta=25 C
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=0 force driver on
Output No outside circuit
Output = 0V
leakage VFB=12 force driver off
current VIN=22V
Output =-1V
Quiescent Current
VFB=12 force driver off
Standby Quiescent
ON /OFF pin=5V
Current
VIN=22V
Low (regulator ON)
ON /OFF pin logic input
High
(regulator OFF)
threshold voltage
IH
ON /OFF pin logic
input current
VLOGIC=2.5V (OFF)
IL
ON /OFF pin input
current
VLOGIC=0.5V (ON)
θJC
Thermal Resistance
θJA
Thermal Resistance
With copper area of
approximately 3 in2
Min.
Typ.
-10
127
110
150
5
15
Max.
-50
-100
173
173
Unit
25
KHz
nA
KHz
1.6
1.4
V
1.7
100
0
%
5.5
3.6
4.5
A
6.5
-200
-5
5
70
2.0
1.3
uA
mA
mA
10
150
200
0.6
-
uA
V
-0.01
uA
TO220-5L
TO263-5L
TO220-5L
TO263-5L
Junction to
case
Junction to
ambient
-0.1
2.5
3.5
28
23
-1
o
C/W
o
C/W
Specifications with boldface type are for full operating temperature range, the other type are for TJ=25ºC.
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Rev.1.1 Oct 29, 2004
3/12
AP1506
150KHz, 3A PWM Buck DC/DC Converter
„ Electrical Characteristics (Continued)
AP1506-ADJ
AP1506-3.3V
AP1506-5V
AP1506-12V
Symbol
Parameter
Conditions
Typ.
Limit
Unit
VFB
Output
Feedback
5V < VIN < 22V
0.2A < ILOAD < 3A
VOUT programmed for
3V
1.23
1.193/1.18
1.267/1.28
V
VMIN
VMAX
η
Efficiency
VIN = 12V, ILOAD=3A
74
VOUT
Output voltage
5.5V < VIN < 22V
0.2A < ILOAD < 3A
3.3
η
Efficiency
VIN = 12V, ILOAD=3A
75
VOUT
Output voltage
8V < VIN < 22V
0.2A < ILOAD < 3A
5
η
Efficiency
VIN = 12V, ILOAD=3A
80
VOUT
Output voltage
15V < VIN < 22V
0.2A < ILOAD < 3A
12
η
Efficiency
VIN = 16V, ILOAD = 3A
89
%
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.
Anachip Corp.
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Rev.1.1 Oct 29, 2004
4/12
AP1506
150KHz, 3A PWM Buck DC/DC Converter
„ Typical Performance Characteristics
AP1506 Efficiency v.s. 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 (%)
AP1506 Efficiency v.s. 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)
AP1506 Saturation Voltage v.s. Temperature
(Vcc=12V,Vfb=0V,VSD=0)
50
70
90 110 130 150
AP1506 Switch Current Limit v.s. 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
Temperature (TA)
75
100
5
4.5
4
3.5
3
-50
125
(°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)
AP1506 Supply Current v.s. 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
55
50
45
Switch OFF
40
35
30
-50 -30 -10 10
30
50
70
90 110 130 150
Temperature (TA) (°C)
Temperature (TA) (°C)
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Rev.1.1 Oct 29, 2004
5/12
AP1506
150KHz, 3A PWM Buck DC/DC Converter
„ Typical Performance Characteristics (Continued)
AP1506 Threshold Voltage v.s. Temperature
(Vcc=12V , Io=100mA)
AP1506 ON/OFF Current v.s. ON/OFF Voltage
(Vin=12V)
1.7
10
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
1.6
ON/OFF Current (nA)
Threshold Voltage (V)
1.5
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)
6
9
12
15
18
21
ON/OFF Voltage (V)
AP1506 Frequency v.s. Temperature
(Vcc=12V , Io=500mA ,Vout=5V)
AP1506 Feedback Current v.s. Temperature
(Vcc=12V , Vout=5V,Vfb=1.3V)
170
10
165
0
Feedback Current (nA)
Frequency (KHz)
3
160
155
150
145
-10
-20
-30
-40
-50
140
-50 -30 -10 10
30
50
70
-50 -30 -10 10
90 110 130 150
Temperature (TA) (°C)
30
50
70
90 110 130 150
Temperature (TA) (°C)
Vout (V)
AP1506 Output Voltage v.s. 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
0
20
40
60
80 100 120 140 160
Temperature (TA) (°C)
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Rev.1.1 Oct 29, 2004
6/12
AP1506
150KHz, 3A PWM Buck DC/DC Converter
„ Typical Application Circuit
(1) Fixed Type Circuit
FB
12V
DC Input
L1
33uH
4
Vin
AP1506
-33
1
5
2
3.3V/3A
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
47uH
4
1
Vin
AP1506
5
SD
Cin
Capacitor
2
Output
5V/ 3A
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
AP1506
5
2
Output
L1
47uH
5V/ 3A
Output Load
3
SD
RDELAY
10K
Gnd
D1
Schottky Diode
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Co
Capacitor
Rev.1.1 Oct 29, 2004
7/12
AP1506
150KHz, 3A PWM Buck DC/DC Converter
„ Function Description
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 was
designed to be soldering 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,
multi-layer PC board with large copper areas and/or
airflow will be 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 (FB)
Senses the regulated output voltage to complete
the feedback loop.
The
AP1506
(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 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 multi-layer PC boards with large
copper areas and/or airflow might be needed,
especially for high ambient temperatures and high
output voltages.
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
wired to the ground pin.
/ OFF pin can be
Thermal Considerations
The AP1506 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 AP1506 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
AP1506 (TO-220 package) operating as a
buck-switching regulator in an ambient temperature
of 25oC (still air). These temperature rise numbers
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Rev.1.1 Oct 29, 2004
8/12
AP1506
150KHz, 3A PWM Buck DC/DC Converter
„ Function Description (Continued)
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.
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
„ Marking Information
(1) TO263-5L
(2) TO220-5L
( Top view )
( Top view )
Output Type:
1506: ADJ
1506-33: 3.3V
1506-50: 5.0V
1506-12: 12V
1506-XX
YY WW X X
Logo
Blank: normal
L: Lead Free Package
ID code
Xth week: 01~52
Year: "01" = 2001
"02" = 2002
Output Type:
1506: ADJ
1506-33: 3.3V
1506-50: 5.0V
1506-12: 12V
1506-XX
YY WW X X
~
Logo
Blank: normal
L: Lead Free Package
ID code
Xth week: 01~52
Year: "01" = 2001
"02" = 2002
~
Anachip Corp.
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Rev.1.1 Oct 29, 2004
9/12
AP1506
150KHz, 3A 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.1.1 Oct 29, 2004
10/12
AP1506
150KHz, 3A 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
C2
A
Land Pattern Recommendation (Unit: mm)
B
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.1.1 Oct 29, 2004
11/12
AP1506
150KHz, 3A 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.1.1 Oct 29, 2004
12/12
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