AP1551 [ANACHIP]
150KHz, Dual Channel 2A PWM Buck DC/DC Converter; 为150KHz ，双通道2A PWM降压型DC / DC转换器
| 型号： | AP1551 |
| 厂家： | 
ANACHIP CORP |
| 描述： | 150KHz, Dual Channel 2A PWM Buck DC/DC Converter |
| 文件： | 总8页 (文件大小：171K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
AP1551
150KHz, Dual Channel 2A PWM Buck DC/DC Converter
Features
General Description
- Dual adjustable output channel
- Adjustable output voltage range, 1.23V to
18V+4%
The AP1551 is monolithic IC designed for dual
channel step-down DC/DC converters, and own the
ability of driving a 2A load each channel 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
- 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: 2A
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 AP1551 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
- SOP-16L Pb-Free 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
frequency. The packages are available in
standard 16-lead SOP-16 package.
a
Pin Assignments
Pin Descriptions
( Top View )
Name
VIN1/2
Description
Operating voltage input
Switching output
16
15
14
13
12
11
1
2
3
4
5
6
7
8
GND2
GND2
SD2
VIN2
SD1
VIN1
GND1
GND1
GND2
GND2
FB2
VOUT2
FB1
VOUT1
VOUT1/2
GND1/2
FB1/2
SD1/2
Ground
Output voltage feedback control
ON/OFF Shutdown
10 GND1
9
GND1
SOP-16L
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. 1.0 Nov 17, 2004
1/8
AP1551
150KHz, Dual Channel 2A PWM Buck DC/DC Converter
Ordering Information
AP 1551 X X
Packing
Package
S: SOP-16L
Blank : Tube
A : Taping
Block Diagram
(Channel 1 and channel 2 are the same)
SD1
VIN1
220mV
200mV
Current
1.235V
2.5V
Start
up
Source
bias
Reference
Regulator
+
Comp
_
_
Comp
+
Frequecy
compen-
sation
+
_
Amp
_
2A
Switch
FB1
Comp
Pre-driver
+
VOUT1
GND
150kHz
OSC.
Thermal
Shutdown
Anachip Corp.
www.anachip.com.tw
Rev. 1.0 Nov 17, 2004
2/8
AP1551
150KHz, Dual Channel 2A PWM Buck DC/DC Converter
Absolute Maximum Ratings
Symbol
Parameter
Supply Voltage
Rating
Unit
VCC
VSD
VFB
VOUT
PD
+24
-0.3 to +18
-0.3 to +18
-1
V
V
ON/OFF Pin input voltage
Feedback Pin voltage
Output voltage to Ground
Power dissipation
V
V
Internally limited
-65 to +150
-40 to +125
+4.5 to +22
W
oC
oC
V
TST
Storage temperature
Operating temperature
Operating voltage
TOP
VOP
Electrical Characteristics
LOAD = 0.5A
USnleysms botohelrwise specifiPeda,rVam=1e2tVe,rI
Conditions
Min.
Typ.
Max.
Unit
IN
VFB1/2=1.3V
-50
-100
173
173
IB1/2
FOSC
FSCP
Feedback bias current
-
-10
nA
(Adjustable version only)
127
110
150
-
Oscillator frequency
KHz
KHz
Oscillator frequency of
short circuit protect
When current limit occurred
and VFB1/2 < 0.5V, Ta=25 oC
5
15
25
1.4
1.5
-
-
I
OUT1/2=2A
VSAT1/2 Saturation voltage
-
1.25
V
%
A
No outside circuit
FB1/2=0V force driver on
VFB1/2=0V force driver on
V
Max. Duty Cycle (ON)
DC
-
-
100
0
Min. Duty Cycle (OFF)
VFB1/2=12V force driver off
Peak current
Current limit for each
ICL1/2
No outside circuit
3
-
-
channel
V
FB1/2=0V force driver on
Output
No outside circuit
Output = 0
-
-
-200
uA
IL1/2
leakage
current
V
V
FB1/2=12V force driver off
IN1/2=22V
Output = -1
-
-
-5
5
mA
mA
IQ1/2
ISTBY1/2
VIL1/2
Quiescent Current
Standby Quiescent
Current
VFB1/2=12V force driver off
ON/OFF pin=5V
10
150
200
0.6
-
-
70
uA
V
IN1/2=22V
Low (regulator ON)
High (regulator OFF)
ON/OFF pin logic input
threshold voltage
1.3
V
VIH1/2
2.0
-
ON/OFF pin logic input
current
IH
IL
VLOGIC=2.5V (OFF)
-
-
-
-
-0.01
uA
ON/OFF pin input current VLOGIC=0.5V (ON)
-0.1
15
-1
-
Junction to
case
θJC
Thermal Resistance
SOP-16L
oC/W
oC/W
Thermal Resistance
With copper area of
approximately 3 in2
Junction to
ambient
θJA
SOP-16L
-
70
-
Anachip Corp.
www.anachip.com.tw
Rev. 1.0 Nov 17, 2004
3/8
AP1551
150KHz, Dual Channel 2A PWM Buck DC/DC Converter
Electrical Characteristics (Continued)
Symbol
Parameter
Conditions
Typ.
1.23
76
Limit
Unit
4.5V < VIN < 22V
0.2A < ILOAD < 2A
V
Output
VFB1
1.193/1.18
1.267/1.28
VMIN
VMAX
Feedback
VOUT programmed for
AP1551-channel 1
AP1551-channel 2
3V
η
Efficiency
V
IN = 12V, ILOAD=2A
%
4.5V < VIN < 22V
0.2A < ILOAD < 2A
V
Output
VFB2
1.23
76
1.193/1.18
1.267/1.28
VMIN
VMAX
Feedback
V
OUT programmed for
3V
η
Efficiency
VIN = 12V, ILOAD=2A
%
Specifications with boldface type are for full operating temperature range, the other type are for TJ=25ºC.
Typical Application Circuit
1
2
3
4
5
6
7
8
GND2
GND2
SD2
GND2 16
GND2 15
FB2 14
OFF ON
OFF ON
12V DC input
33uH
3.3V Vout2
R3
VIN2
VOUT2 13
FB1 12
SD1
33uH
2.5V Vout1
1.8k
Ω
VIN1
VOUT1 11
GND1 10
R1
GND1
GND1
Cout2
470uF
1.1k
R2
Ω
R4
Cin
GND1
9
Cout1
470uF
1k
Ω
820uF
1k
Ω
R1
R2
Vout1 =VFB ×(1 +
);
);
R3
Vout2 =VFB ×(1 +
VFB = 1.235V
R4
R2 = R4 = 1K ~ 3K
Anachip Corp.
www.anachip.com.tw
Rev. 1.0 Nov 17, 2004
4/8
AP1551
150KHz, Dual Channel 2A PWM Buck DC/DC Converter
Typical Performance Characteristics (For Each Channel)
AP1551 Efficiency v.s. Temperature
(Vin=12V,Vout=5V,Io=2A)
AP1551 Efficiency v.s. Temperature
(Vin=12V,Vout=3.3V,Io=2A)
86
81
80
79
78
77
76
75
74
73
85
84
83
82
81
80
79
78
77
76
75
-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)
AP1551 Saturation Voltage v.s. Temperature
(Vcc=12V,Vfb=0V,VSD=0)
AP1551 Switch Current Limit v.s. Temperature
(Vcc=12V,Vfb=0V)
1.4
5.5
1.3
5
1.2
2A
4.5
4
1.1
1A
1
0.5A
0.9
3.5
3
0.8
0.7
-50
-30
-10
10
30
50
70
90
-50
-25
0
25
50
75
100
125
Temperature (TA)ꢀ(°C)
Temperature (TA) (°C)
AP1551 Supply Current v.s. Temperature
(Vcc=12V , No Load ,Von/off =0V(Switch ON) ,Von/off =5V(Switch OFF))
15
14
13
12
11
10
9
60
55
50
45
40
35
30
Switch OFF
8
Switch ON
7
6
5
-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)
Anachip Corp.
www.anachip.com.tw
Rev. 1.0 Nov 17, 2004
5/8
AP1551
150KHz, Dual Channel 2A PWM Buck DC/DC Converter
Typical Performance Characteristics (For Each Channel) (Continued)
AP1551 Threshold Voltage v.s. Temperature
(Vcc=12V , Io=100mA)
AP1551 ON/OFF Current v.s. ON/OFF Voltage
(Vin=12V)
1.7
1.6
1.5
1.4
1.3
1.2
1.1
1
10
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
0.9
0.8
0
3
6
9
12
15
18
21
-50 -30 -10 10 30 50 70 90 110 130 150
Temperature (TA) (°C)
ON/OFF Voltage (V)
AP1551 Frequency v.s. Temperature
(Vcc=12V , Io=500mA ,Vout=5V)
AP1551 Feedback Current v.s. Temperature
(Vcc=12V , Vout=5V,Vfb=1.3V)
170
165
160
155
150
145
10
0
-10
-20
-30
-40
140
-50
-50 -30 -10 10 30 50 70 90 110 130 150
-50 -30 -10 10 30 50 70 90 110 130 150
Temperature (TA) (°C)
Temperature (TA) (°C)
AP1551 Output Voltage v.s. Temperature
(Vin=12V ,Io=2A)
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)
Anachip Corp.
www.anachip.com.tw
Rev. 1.0 Nov 17, 2004
6/8
AP1551
150KHz, Dual Channel 2A PWM Buck DC/DC Converter
Function Description
Pin Functions
Thermal Considerations
The SOP-16 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 AP1551
junction temperature rises above ambient
temperature for each channel with a 2A load and
different input and output voltages. The data for
these curves was taken with the AP1551 (SOP-16
package) operating as a buck-switching regulator in
an ambient temperature of 25oC (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.
+VIN1/2
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.
Ground1/2
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.
Feedback1/2
Senses the regulated output voltage to complete
the feedback loop.
SD1/2
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 SD 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.
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.
Anachip Corp.
www.anachip.com.tw
Rev. 1.0 Nov 17, 2004
7/8
AP1551
150KHz, Dual Channel 2A PWM Buck DC/DC Converter
Marking Information
SOP-16L
( Top View )
16
1
9
8
Logo
AP1551
YY WW X
Part No.
ID code: internal
Xth week: 01~52
Year:
"01" = 2001
"02" = 2002
SOP-16L
Package Information
Package Type: SOP-16L
θ
L
VIEW "A"
D
7o(4X)
0.015x45o
VIEW "A"
7o(4X)
e
B
y
Dimensions In Millimeters
Dimensions In Inches
Symbol
Min.
1.40
0.10
1.30
0.33
0.19
9.80
3.80
-
Nom.
1.60
-
Max.
1.75
0.25
1.50
0.51
0.25
10.00
4.00
-
Min.
0.055
0.040
0.051
0.013
0.0075
0.386
0.150
-
Nom.
0.063
-
Max.
0.069
0.010
0.059
0.020
0.0098
0.394
0.157
-
0.244
0.050
8
A
A1
A2
B
1.45
0.41
0.20
9.90
3.90
1.27
6.00
0.71
-
0.057
0.016
0.008
0.390
0.154
0.050
0.236
0.028
-
C
D
E
e
H
L
5.80
0.38
0
6.20
1.27
8
0.228
0.015
0
θ
Anachip Corp.
www.anachip.com.tw
Rev. 1.0 Nov 17, 2004
8/8
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