AP1516-33SA [ANACHIP]
150KHz, 3A PWM Buck DC/DC Converter + 1A Ultra Low; 为150KHz ， 3A PWM降压型DC / DC转换器+ 1A超低
| 型号： | AP1516-33SA |
| 厂家： | 
ANACHIP CORP |
| 描述： | 150KHz, 3A PWM Buck DC/DC Converter + 1A Ultra Low |
| 文件： | 总10页 (文件大小：206K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
AP1516
150KHz, 3A PWM Buck DC/DC Converter + 1A Ultra Low
Drop Regulator
Features
General Description
* Channel 1: simple switch
The Channel 1 is a step-down DC/DC converter,
and own the ability of driving a 3A 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
- Adjustable version output voltage range, 1.23V to
18V+4% & Fixed 3.3V version
- 150KHz +20% fixed switching frequency
- Voltage mode non-synchronous PWM control
- ON/OFF shutdown control input
- Operating voltage can be up to 20V
- Output load current: 3A
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
- Low power standby mode
* Channel 2: ultra low drop regulator
- Adjustable output voltage
- 0.6V Maximum Dropout voltage at 1.0A Load
current
- Fast transient response
frequency will be reduced.
The switching
- Good noise rejection
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 +20% on the oscillator
frequency.
* Channel 1 & Channel 2
- SOP-16L Pb-free package
- Built-in switching transistor on chip
- Thermal-shutdown and current-limit protection of
each channel
Applications
The channel 2 is a 1A regulator with extremely low
dropout voltage. This product is specifically
designed to provide well regulated supply for
applications requiring 2.8V or lower voltages from
3.3V power supplies where high efficiency of a
switcher can be achieved without the cost and
complexity associated with switching regulator.
- PC Motherboard
- LCD Monitor
- Graphic Card
- DVD-Video Player
- NIC/Switch
- Telecom Equipment
- ADSL Modem
- Printer and other Peripheral Equipment
Pin Assignments
Pin Descriptions
( Top View )
Name
Description
GND
GND
VOUT1
FB1
SD1
VIN2
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
GND
GND
VIN1
VB
VSENSE2
FB2
VIN1
VB
Operating voltage input of channel 1
Channel 2 bias voltage
VIN2
Main power source of channel 2
VOUT1 Channel 1 switching output
VOUT2 Channel 2 output
FB1
FB2
SD1
Output1 voltage feedback control
Output2 voltage feedback control
Channel 1 ON/OFF shutdown
VOUT2
VOUT2
VOUT2
VOUT2
VSENSE2 Channel 2 output sense pin
GND Ground
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.1.1 May 23, 2005
1/10
AP1516
150KHz, 3A PWM Buck DC/DC Converter + 1A Ultra Low
Drop Regulator
Ordering Information
AP1516 XX X X
Package
Packing
Output version
Blank : Tube
Ch1: Blank : Adjustable
-33 : 3.3V
S: SOP-16L
A
: Taping
Block Diagram
SD
VIN1
200mV
220mV
Current
Source
bias
2.5V
1.235V
Start
up
Regulator
Reference
+
Comp
_
_
Comp
+
Frequecy
compen-
sation
+
_
Amp
_
3A
Switch
Comp
+
FB1
Pre-driver
VOUT1
GND
150kHz
OSC.
Thermal
Limit
VIN2
VB
VOUT2
VSENSE2
+
+
_
1.25V
CURRENT
LIMIT
+
THERMAL
FB2
SHUTDOWN
Anachip Corp.
www.anachip.com.tw
Rev.1.1 May 23, 2005
2/10
AP1516
150KHz, 3A PWM Buck DC/DC Converter + 1A Ultra Low
Drop Regulator
Absolute Maximum Ratings
Symbol
Parameter
Rating
+22
+14
Unit
VIN1, B
VIN2
VSD
Supply Voltage
V
V
Supply Voltage
ON/OFF Pin Input Voltage
Feedback Pin Voltage
Output Voltage to Ground
Power Dissipation
-0.3 to +18
-0.3 to +18
-1
V
VFB1
VOUT1
PD
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 (All Output Voltage Versions)
Unless otherwise specified, VIN2=12V for 3.3V, ILOAD = 0.5A
Sym.
Parameter
Conditions
VFB1=1.3V
(Adjustable version only)
Min.
Typ.
-10
Max.
Unit
-50
-100
173
173
IB1
Feedback Bias Current
nA
127
110
150
FOSC Oscillator Frequency
Oscillator Frequency of Short
KHz
KHz
When
current
limit
<
FSCP
occurred and VFB1
0.5V, Ta=25 oC
IOUT1=2A
5
15
25
Circuit Protect
1.4
VSAT1 Saturation Voltage
1.25
V
%
A
No outside circuit
1.5
V
FB1=0V force driver on
Max. Duty Cycle (ON)
DC
VFB=0V force driver on
VFB=12V force driver off
Peak current
100
0
Min. Duty Cycle (OFF)
ICL1
Current Limit
No outside circuit
3.5
V
FB1=0V force driver on
Output
No outside circuit
Output = 0
Output = -1
-200
uA
IL
Leakage
Current
V
FB1=12V force driver off
IN1=22V
V
-5
5
mA
mA
IQ
Quiescent Current
Standby Quiescent
Current
VFB1=12V force driver off
ON/OFF pin=5V
10
150
200
0.6
-
ISTBY
70
uA
VIN1=22V
VIL
VIH
ON/OFF Pin Logic Input
Threshold Voltage
ON/OFF Pin Logic Input
Current
Low (regulator ON)
High (regulator OFF)
-
1.3
V
2.0
IH
IL
VLOGIC=2.5V (OFF)
VLOGIC=0.5V (ON)
-0.01
-1
uA
ON/OFF Pin Input Current
-0.1
10
Junction to
θJC
Thermal Resistance
SOP-16L
oC/W
oC/W
case
Thermal Resistance with
Junction to
θJA
Copper Area of Approximately SOP-16L
40
ambient
15 in2 + 15 in2
Anachip Corp.
www.anachip.com.tw
Rev.1.1 May 23, 2005
3/10
AP1516
150KHz, 3A PWM Buck DC/DC Converter + 1A Ultra Low
Drop Regulator
Electrical Characteristics (Continued)
Unless otherwise specified, these specifications apply over, CIN=1uF, COUT=10uF, and TJ=0 to 150oC. Typical value refer to TJ=25oC.
VOUT = VSENSE.
Sym.
Parameter
Test Condition
Min.
Typ.
Max.
Unit
TJ=25oC,(VIN2-VOUT2)=0.5V,
IO=10mA VB =VIN2+1V
IO2=10mA,
VREF Reference Voltage
1.225
1.250
1.275
V
Line Regulation
V
OUT2+0.5V<VIN2<12V
0.2
1
%
%
VB =VIN2+1V
0mA< IO2<1.0A, TJ=25oC,
(VIN2 – VOUT2) = 2V,
Load Regulation
VB = VIN2 + 1V
VFB2 =0V for all conditions
below. VIN2 =2.05V, IO2=1.0A
VFB2 =0V for all conditions
below. VB =3V, IO2=1.0A
VB =3V, VIN2 =2.05V,
∆VO=100mV, VFB2=0V
VB =5V, VIN2 =3.3V,
Dropout Voltage (VB-VOUT2
)
1.5
0.5
1.7
0.6
V
V
A
Dropout Voltage (VIN2-VOUT2
)
Current Limit
1.1
60
Minimum Load Current
Thermal Regulation
5
10
mA
V
FB2 =0V
30ms Pulse
VB =5V, VIN2 =5V, IO2=1.0A,
0.01
0.02
%W
Ripple Rejection
V
V
FB2 =0V, TJ =25,
70
dB
RIPPLE=1Vpp at 120Hz
VFB2 =0V for all conditions
below. VB =2.75V,
Control Pin Current
Adjust Pin Current
6
10
mA
µA
V
IN2 =2.05V, IO2=1.0A
VB =2.75V, VIN2=2.05,VFB2=0
50
120
Symbol Parameter
Conditions
Typ.
Limit
Unit
4.5V < VIN1 < 22V
V
VMIN
VMAX
%
Output
VFB1
0.2A < ILOAD1 < 3A
1.23
74
1.193/1.18
1.267/1.28
AP1516-ADJ
AP1516-3.3V
Feedback
V
OUT programmed for 3V
η
VOUT1
η
Efficiency
VIN1 = 12V, ILOAD1=3A
V
Output
voltage
4.75V < VIN1 < 22V
0.2A < ILOAD1 < 3A
3.168/3.135
3.432/3.465
3.3
76
VMIN
VMAX
%
Efficiency
VIN1 = 12V, ILOAD1=3A
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 May 23, 2005
4/10
AP1516
150KHz, 3A PWM Buck DC/DC Converter + 1A Ultra Low
Drop Regulator
Typical Application Circuit
(1) AP1516-3.3 Fix Version
VB
13
VIN2
6
14
7/8/9/10
VCC1
330u
12V
VIN1
VOUT2
VOUT2
2.5V/1A
12
VSENSE2
R1
VOUT1
3.3/3A
680uF
AP1516-3.3
4
3
FB1
121
121
33u
SR360
470uF
11
VOUT1
FB2
R2
5
1/2/15/16
SD1
GND
IFB2
* R1 & R2 =100 ~200 ohm
* VOUT2=1.235(1+R2/R1)+IFB2 *R2
(2) AP1516-ADJ Version
VB
13
VIN2
6
14
7/8/9/10
VCC1
330u
VIN1
VOUT2
VOUT2
12
1.8V/1A
4
3
VSENSE2
R1
FB1
VOUT1
2.5/3A
AP1516
33u
SR360
220
100
VOUT1
470uF
11
R3
R4
1K
1K
FB2
R2
5
1/2/15/16
GND
680uF
SD1
* R1 = 200 ~ 300 ohm
* R4 = 1K ~ 2K
* VOUT1 = 1.235*(1+R3/R4)
Anachip Corp.
www.anachip.com.tw
Rev.1.1 May 23, 2005
5/10
AP1516
150KHz, 3A PWM Buck DC/DC Converter + 1A Ultra Low
Drop Regulator
Typical Performance Characteristics
AP1516 Efficiency v.s. Temperature
(VIN1=12V, VOUT1=5V, IO1=3A)
AP1516 Efficiency v.s. Temperature
(VIN1=12V, VOUT1=3.3V, IO1=3A)
83
78
77
76
75
74
73
72
71
70
82
81
80
79
78
77
76
75
74
73
72
-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)
AP1516 Saturation Voltage v.s. Temperature
(VIN1=12V, VFB1=0V, VSD1=0)
AP1516 Switch Current Limit v.s. Temperature
(VIN1=12V, VFB1=0V)
1.6
1.5
1.4
5.5
3A
5
1.3
1.2
1.1
1
2A
4.5
4
1A
0.5A
0.9
0.8
0.7
3.5
3
-50
-30
-10
10
30
50
70
90
-50
-25
0
25
50
75
100
125
Temperature (TA)ꢀ(°C)
Temperature (TA) (°C)
AP1516 Supply Current v.s. Temperature
(VIN1=12V, No Load , VSD1=0V(Switch ON), VSD1=5V(Switch OFF))
15
60
55
50
14
13
12
11
10
9
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.1.1 May 23, 2005
6/10
AP1516
150KHz, 3A PWM Buck DC/DC Converter + 1A Ultra Low
Drop Regulator
Typical Performance Characteristics (Continued)
AP1516 Threshold Voltage v.s. Temperature
(VIN1=12V, IO1=100mA)
AP1516 ON/OFF Current v.s. ON/OFF Voltage
(VIN1=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
ON/OFF Voltage (V)
Temperature (TA) (°C)
AP1516 Frequency v.s. Temperature
(VIN1=12V, IO1=500mA, VOUT1=5V)
AP1516 Feedback Current v.s. Temperature
(VIN1=12V, VOUT1=5V, VFB1=1.3V)
170
165
160
155
150
145
140
10
0
-10
-20
-30
-40
-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)
AP1516 Output Voltage v.s. Temperature
(VIN1=12V, IO1=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)
Anachip Corp.
www.anachip.com.tw
Rev.1.1 May 23, 2005
7/10
AP1516
150KHz, 3A PWM Buck DC/DC Converter + 1A Ultra Low
Drop Regulator
Function Description
of two external resistors to any voltages within the
range of 1.25V to 15.5V. Another major
requirement of these graphic chips is the need to
switch the load current from zero to several amps in
tens of nanoseconds at the processor pins, which
translates to an approximately 300 to 500ns of
current step at the regulator. In addition, the output
voltage tolerances are also extremely tight and they
include the transient response as part of the
specification.
Pin Functions
+VIN, B
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.
The channel 2 is specifically designed to meet
the fast current transient needs as well as
providing an accurate initial voltage, reducing
the overall system cost with the need for fewer
number of output capacitors. Another feature of
the device is its true remote sensing capability
that allows accurate voltage setting at the load
rather than at the device.
VOUT1
Internal switch. The voltage at this pin switches
between (+VIN1 – VSAT) and approximately – 0.5V,
with a duty cycle of approximately VOUT1 / VIN1
. To
minimize coupling to sensitive circuitry, the PC
board copper area connected to this pin should be
kept a minimum.
Feedback
Output Voltage Setting
Senses the regulated output voltage to complete
the feedback loop.
The channel 2 can be programmed to any voltages
in the range of 1.25V to 15.5V with the addition of
R1 and R2 external resistors according to the
following formula:
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 SD pin can be wired to
the ground pin.
Vout = Vref (1+R2/R1) + IFB2 * R2 where : Vref = 1.25V & IFB2=50uA Typically
Vin3
Vout2
Channel 2-ADJ
Vsense2
Vin2
Vref
R1+
R2+
FB
IFB2=50uA
Introduction
The channel 2 regulator is a extremely low dropout
voltages comparable to the PNP type without the
disadvantage of the extra power dissipation due to
the base current associated with PNP regulators.
This is done by bringing out the control pin of the
regulator that provides the base current to the
power NPN and connecting it to a voltage that is
greater than the voltage present at the VIN2 pin. This
flexibility makes the channel 2 ideal for applications
where dual inputs are available such as a computer
motherboard with an ATX style power supply that
provides 5V and 3.3V to the board. One such
application is the new graphic chip sets that require
anywhere from 2.4V to 2.7V supply. The channel
2-ADJ can easily be programmed with the addition
The channel 2 keeps a constant 1.25V between the
SENSE pin and the FB2 pin. By placing a resistor R1
V
across these two pins and connecting the VSENSE
and VOUT pin together, a constant current flows
through R1, adding to the IFB2 current and into the
R2 resistor producing a voltage equal to the
(1.25/R1)*R2 + IFB2*R2. This voltage is then added
to the 1.25V to set the output voltage. This is
summarized in the above equation.
Anachip Corp.
www.anachip.com.tw
Rev.1.1 May 23, 2005
8/10
AP1516
150KHz, 3A PWM Buck DC/DC Converter + 1A Ultra Low
Drop Regulator
Function Description (Continued)
Since the minimum load current requirement of the
channel 2 is 10mA, R1 is typically selected to be a
121Ω resistor so that it automatically satisfies this
condition. Notice that since the IFB2 is typically in
the range of 50uA it only adds a small error to the
output voltage and should be considered when very
precise output voltage setting is required.
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 AP1516
junction temperature rises above ambient
temperature for a 3A load and different input and
output voltages.
Load Regulation
Since the channel 2 has separate pins for the
output (VOUT2) and the sense (VSENSE2), it is ideal for
providing true remote sensing of the output voltage
at the load. This means that the voltage drops due
to parasitic resistance such as PCB traces between
the regulator and the load are compensated for
using remote sensing. Figure following shows a
typical application of the channel 2 with remote
sensing.
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.
Package
thermal
resistance
and
junction
Vout2
Channel 2-ADJ
Vin3
Vin2
Vin3
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.
Vsense2
Vin2
FB2
R1
R2
RL
Stability
The channel 2 requires the use of an output
capacitor as part of the frequency compensation in
order to make the regulator stable. Typical designs
for the microprocessor applications use standard
electrolytic capacitors with typical ESR in the range
of 50 to 100mΩ and an output capacitance of
100uF to 1000uF. Fortunately as the capacitance
increases, the ESR decreases resulting in a fixed
RC time constant. The channel 2 takes advantage
of the phenomena in making the overall regulator
loop stable.
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.
For most applications
a minimum of 100uF
aluminum electrolytic capacitor insures both
stability and good transient response.
Anachip Corp.
www.anachip.com.tw
Rev.1.1 May 23, 2005
9/10
AP1516
150KHz, 3A PWM Buck DC/DC Converter + 1A Ultra Low
Drop Regulator
Marking Information
( Top View )
9
16
Logo
Date Code
Part No.
AP1516-XX
YY WW X
X: Internal code
Output Type:
Blank: Adjustable
33:3.3V
WW: Xth week:01~52
YY: Year:
"01" = 2001
"02" = 2002
1
8
SOP-16L
Package Information
Package Type: SOP-16L
?
L
VIEW "A"
D
7o(4X)
7o(4X)
0.015x45o
e
B
VIEW "A"
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
5.80
0.38
0
6.20
1.27
8
0.228
0.015
0
L
Θ
Anachip Corp.
www.anachip.com.tw
Rev.1.1 May 23, 2005
10/10
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