AP1551 Datasheet PDF - Anachip


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AP1551
Anachip

Part Number AP1551
Description 150KHz Dual Channel 2A PWM Buck DC/DC Converter
Page 8 Pages

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150KHz, Dual Channel 2A PWM Buck DC/DC Converter
www.DataSheet4U.com
AP1551
„ Features
- Dual adjustable output channel
- Adjustable output voltage range, 1.23V
18V+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 22V
- Output load current: 2A
- SOP-16L Pb-Free packages
- Low power standby mode
- Built-in switching transistor on chip
to
„ Applications
- Simple High-efficiency step-down regulator
- On-card switching regulators
- Positive to negative converter
„ General Description
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
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
frequency. The packages are available in a
standard 16-lead SOP-16 package.
„ Pin Assignments
„ Pin Descriptions
( Top View )
GND2
GND2
SD2
VIN2
SD1
VIN1
GND1
GND1
1
2
3
4
5
6
7
8
16 GND2
15 GND2
14 FB2
13 VOUT2
12 FB1
11 VOUT1
10 GND1
9 GND1
SOP-16L
Name
VIN1/2
VOUT1/2
GND1/2
FB1/2
SD1/2
Description
Operating voltage input
Switching output
Ground
Output voltage feedback control
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. 1.0 Nov 17, 2004
1/8



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150KHz, Dual Channel 2A PWM Buck DC/DC Converter
„ Ordering Information
AP 1551 X X
Package
S: SOP-16L
Packing
Blank : Tube
A : Taping
www.DataSheet4U.com
AP1551
„ Block Diagram
(Channel 1 and channel 2 are the same)
SD1
FB1
Current
Source
bias
1.235V
Reference
2.5V
Regulator
Start
up
200mV
220mV
+
Com_p
+
Amp
_
Frequecy
compen-
sation
Comp
+
Comp
+
Pre-driver
150kHz
OSC.
Thermal
Shutdown
VIN1
2A
Switch
VOUT1
GND
Anachip Corp.
www.anachip.com.tw
Rev. 1.0 Nov 17, 2004
2/8



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150KHz, Dual Channel 2A PWM Buck DC/DC Converter
www.DataSheet4U.com
AP1551
„ Absolute Maximum Ratings
Symbol
VCC
VSD
VFB
VOUT
PD
TST
TOP
VOP
Parameter
Supply Voltage
ON/OFF Pin input voltage
Feedback Pin voltage
Output voltage to Ground
Power dissipation
Storage temperature
Operating temperature
Operating voltage
Rating
+24
-0.3 to +18
-0.3 to +18
-1
Internally limited
-65 to +150
-40 to +125
+4.5 to +22
„ Electrical Characteristics
Unless otherwise specified, VIN=12V, ILOAD = 0.5A
Symbol
Parameter
Conditions
IB1/2
Feedback bias current
VFB1/2=1.3V
(Adjustable version only)
FOSC
FSCP
VSAT1/2
DC
ICL1/2
IL1/2
IQ1/2
ISTBY1/2
VIL1/2
VIH1/2
IH
IL
θJC
θJA
Oscillator frequency
Oscillator frequency of
short circuit protect
Saturation voltage
Max. Duty Cycle (ON)
Min. Duty Cycle (OFF)
Current limit for each
channel
Output = 0
Output
leakage
Output = -1 current
Quiescent Current
Standby Quiescent
Current
ON/OFF pin logic input
threshold voltage
When current limit occurred
and VFB1/2 < 0.5V, Ta=25 oC
IOUT1/2=2A
No outside circuit
VFB1/2=0V force driver on
VFB1/2=0V force driver on
VFB1/2=12V force driver off
Peak current
No outside circuit
VFB1/2=0V force driver on
No outside circuit
VFB1/2=12V force driver off
VIN1/2=22V
VFB1/2=12V force driver off
ON/OFF pin=5V
VIN1/2=22V
Low (regulator ON)
High (regulator OFF)
ON/OFF pin logic input
current
VLOGIC=2.5V (OFF)
ON/OFF pin input current VLOGIC=0.5V (ON)
Thermal Resistance
SOP-16L
Junction to
case
Thermal Resistance
With copper area of
approximately 3 in2
SOP-16L
Junction to
ambient
Min.
-
127
110
5
-
-
-
3
-
-
-
-
-
2.0
-
-
-
-
Typ.
-10
150
-
15
1.25
100
0
-
-
-5
5
70
1.3
-
-0.1
15
70
Unit
V
V
V
V
W
oC
oC
V
Max.
-50
-100
173
173
25
1.4
1.5
-
-
-
Unit
nA
KHz
KHz
V
%
A
-200
10
150
200
0.6
-
-0.01
-1
-
uA
mA
mA
uA
V
uA
oC/W
- oC/W
Anachip Corp.
www.anachip.com.tw
Rev. 1.0 Nov 17, 2004
3/8



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150KHz, Dual Channel 2A PWM Buck DC/DC Converter
www.DataSheet4U.com
AP1551
„ Electrical Characteristics (Continued)
AP1551-channel 1
AP1551-channel 2
Symbol
VFB1
η
VFB2
η
Parameter
Conditions
Output
Feedback
4.5V < VIN < 22V
0.2A < ILOAD < 2A
VOUT programmed for
3V
Efficiency
Output
Feedback
VIN = 12V, ILOAD=2A
4.5V < VIN < 22V
0.2A < ILOAD < 2A
VOUT programmed for
3V
Efficiency VIN = 12V, ILOAD=2A
Typ.
1.23
76
1.23
76
Limit
1.193/1.18
1.267/1.28
1.193/1.18
1.267/1.28
Specifications with boldface type are for full operating temperature range, the other type are for TJ=25ºC.
„ Typical Application Circuit
Unit
V
VMIN
VMAX
%
V
VMIN
VMAX
%
12V DC input
OFF ON
OFF ON
Cin
820uF
1 GND2
2 GND2
3 SD2
4 VIN2
5 SD1
6 VIN1
7 GND1
8 GND1
GND2 16
GND2 15
FB2 14
VOUT2 13
FB1 12
VOUT1 11
GND1 10
GND1 9
33uH
33uH 3.3V Vout2
2.5V Vout1
R1
1.1k
R2 Cout1
1k470uF
R3
1.8k
Cout2
R4 470uF
1k
Vout1
=VFB
×
(1
+
R1
R2
);
Vout2
=VFB
×
(1
+
R3
R4
);
VFB = 1.235V
R2 = R4 = 1K ~ 3K
Anachip Corp.
www.anachip.com.tw
Rev. 1.0 Nov 17, 2004
4/8




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