Anachip AP1507-D5LA 150khz, 3a pwm buck dc/dc converter Datasheet

AP1507
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 AP1507 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 against 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 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 fixed 3.3V, 5V, 12V, and an adjustable
type. The package is available in a 5-lead TO-252.
- ON /OFF shutdown control input
- Operating voltage can be up to 22V
- Output load current: 3A
- TO252-5L 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
Name
( Top View )
VIN
5 SD
4 FB
3 Gnd
2 Output
1 VIN
Output
GND
Metal Tab GND
TO252-5L
Description
Operating voltage input
Switching output
Ground
FB
Output voltage feedback control
SD
ON /OFF Shutdown
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
1/9
AP1507
150KHz, 3A PWM Buck DC/DC Converter
„ Ordering Information
AP1507 XX X X X
Output version
Blank : Adjustable
-33 : 3.3V
-50 : 5.0V
-12 : 12V
Lead Free
Package
Packing
D5: TO252-5L Blank : Normal
Blank : Tube
L : Lead Free Package A : Taping
„ 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
3A
Switch
Output
150kHz
OSC.
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Thermal
Shutdown
Gnd
Rev.1.1 Oct 29, 2004
2/9
AP1507
150KHz, 3A PWM Buck DC/DC Converter
„ Absolute Maximum Ratings
Symbol
Parameter
VCC
Supply Voltage
VSD
ON /OFF Pin input voltage
Feedback Pin voltage
Output voltage to Ground
Power dissipation
Storage temperature
Operating temperature
Operating voltage
VFB
VOUT
PD
TST
TOP
VOP
Rating
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
ILEAK
IQ
ISTBY
VIL
VIH
Conditions
VFB=1.3V
(Adjustable version only)
of 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
Low (regulator ON)
ON /OFF pin logic input
High
(regulator OFF)
threshold voltage
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
With copper area of
TO252-5L
ambient
approximately 2cm ×2cm
ΘJC
ΘJA
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
3.6
4.5
%
5.5
A
6.5
-200
-5
5
70
2.0
1.3
VLOGIC=2.5V (OFF)
uA
mA
mA
10
150
200
0.6
-
uA
V
-0.01
-0.1
uA
-1
10
o
50
o
C/W
C/W
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
3/9
AP1507
150KHz, 3A PWM Buck DC/DC Converter
„ Electrical Characteristics (Continued)
AP1507-ADJ
AP1507-3.3V
AP1507-5V
AP1507-12V
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.
www.anachip.com.tw
Rev.1.1 Oct 29, 2004
4/9
AP1507
150KHz, 3A PWM Buck DC/DC Converter
„ Typical Performance Characteristics
AP1507 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 (%)
AP1507 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)
AP1507 Saturation Voltage v.s. Temperature
(Vcc=12V,Vfb=0V,VSD=0)
50
70
90 110 130 150
AP1507 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)
AP1507 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)
Anachip Corp.
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Rev.1.1 Oct 29, 2004
5/9
AP1507
150KHz, 3A PWM Buck DC/DC Converter
„ Typical Performance Characteristics (Continued)
AP1507 Threshold Voltage v.s. Temperature
(Vcc=12V , Io=100mA)
AP1507 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)
AP1507 Frequency v.s. Temperature
(Vcc=12V , Io=500mA ,Vout=5V)
AP1507 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)
AP1507 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
6/9
AP1507
150KHz, 3A PWM Buck DC/DC Converter
„ Typical Application Circuit
(1) Fixed Type Circuit
FB
12V
DC Input
L1
33uH
4
Vin
AP1507
-33
1
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
AP1507
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
AP1507
5
2
Output
L1
47uH
5V/ 3A
Output Load
3
SD
RDELAY
10K
Gnd
D1
Schottky Diode
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Capacitor
Rev.1.1 Oct 29, 2004
7/9
AP1507
150KHz, 3A PWM Buck DC/DC Converter
„ Function Description
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 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.
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.
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.
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
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.
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 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.
Anachip Corp.
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Rev.1.1 Oct 29, 2004
8/9
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
Logo
Blank: normal
L: Lead Free Package
ID Code
Xth Week: 01~52
Year: "01" = 2001
"02" = 2002
1507 - XX
XX XX XX
~
„ Package Information
Package Type: TO252-5L
5.6
A
7.2
D
2.0
M
11.0
C
5.6
B
P(TYP.)
G
1.27
0.6
Land Pattern Recommendation (Unit: mm)
L
Symbol
A
B
C
D
P
S
G
H
J
K
L
M
Dimensions In Millimeters
Min.
Nom.
Max.
6.35
6.60
6.85
5.20
5.35
5.50
6.80
7.00
7.20
2.20
2.50
2.80
1.27 REF.
0.50
0.65
0.80
0.40
0.50
0.60
2.20
2.30
2.40
0.46
0.52
0.58
0.00
0.08
0.15
0.90
1.20
1.50
5.40
5.50
5.59
Anachip Corp.
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J
H
K
S
Dimensions In Inches
Min.
Nom.
Max.
0.250
0.260
0.270
0.205
0.211
0.217
0.268
0.276
0.283
0.087
0.098
0.110
0.050 REF.
0.020
0.026
0.031
0.016
0.020
0.024
0.087
0.091
0.094
0.018
0.020
0.023
0.000
0.003
0.006
0.035
0.047
0.059
0.213
0.216
0.220
Rev.1.1 Oct 29, 2004
9/9
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