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PDF APW7145 Data sheet ( Hoja de datos )
| Número de pieza | APW7145 | |
| Descripción | Synchronous-Rectified Buck Converter | |
| Fabricantes | Anpec Electronics Coropration | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de APW7145 (archivo pdf) en la parte inferior de esta página. Total 23 Páginas | ||
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APW7145
3A, 12V, Synchronous-Rectified Buck Converter
Features
General Description
• Wide Input Voltage from 4.3V to 14V
• Output Current up to 3A
• Adjustable Output Voltage from 0.8V to VIN
- ±2% System Accuracy
• 55mΩ Integrated Power MOSFETs
• High Efficiency up to 95%
- Automatic Skip/PWM Mode Operation
• Current-Mode Operation
- Easy Feedback Compensation
- Stable with Low ESR Output Capacitors
- Fast Load/Line Transient Response
• Power-On-Reset Monitoring
• Fixed 500kHz Switching Frequency in PWM Mode
• Built-in Digital Soft-Start and Soft-Stop
• Current-Limit Protection with Frequency Foldback
• 118% Over-Voltage Protection
• Hiccup-Mode 50% Under-Voltage Protection
• Over-Temperature Protection
• <3µA Quiescent Current in Shutdown Mode
• SOP-8P and Compact 4mmx4mm DFN-8
www.DataSheet(4DUF.Nco4mx4-8) Packages
• Lead Free and Green Devices Available
(RoHS Compliant)
Applications
• OLPC, UMPC
• Notebook Computer
• Handheld Portable Device
• Step-Down Converters Requiring High Efficiency
and 3A Output Current
The APW7145 is a 3A synchronous-rectified Buck con-
verter with integrated 55mΩ power MOSFETs. The
APW7145, designed with a current-mode control scheme,
can convert wide input voltage of 4.3V to 14V to the out-
put voltage adjustable from 0.8V to VIN to provide excel-
lent output voltage regulation.
For high efficiency over all load current range, the
APW7145 is equipped with an automatic Skip/PWM mode
operation. At light load, the IC operates in the Skip mode,
which keeps a constant minimum inductor peak current,
to reduce switching losses. At heavy load, the IC works in
PWM mode, which inductor peak current is programmed
by the COMP voltage, to provide high efficiency and ex-
cellent output voltage regulation.
The APW7145 is also equipped with power-on-reset, soft-
start, soft-stop, and whole protections (under-voltage,
over-voltage, over-temperature, and current-limit) into a
single package. In shutdown mode, the supply current
drops below 3µA.
This device, available SOP-8P and DFN4x4-8 packages,
provides a very compact system solution with minimal
external components and PCB area.
100
90
80
70
60
50
40
30
20
10
0
0.001
VIN=5V, VOUT=3.3V, L1=2.2µF
VIN=12V, VOUT=5V, L1=6.8µF
VIN=12V, VOUT=3.3V, L1=4.7µF
VIN=5V, VOUT=1.2V, L1=2.2µF
VIN=12V, VOUT=2V, L1=3.3µF
0.01
0.1
1
10
ANPEC reserves the right to make changes to improve reliability or manufacturability without notice, and advise
customers to obtain the latest version of relevant information to verify before placing orders.
Copyright © ANPEC Electronics Corp.
Rev. A.3- Sep., 2008
1
www.anpec.com.tw
1 page  
APW7145
Typical Operating Characteristics
(Refer to the application circuit 1 in the section “Typical Application Circuits”, VIN=12V, VOUT=3.3V, L1=4.7µH)
Output Current vs. Efficiency
100
90
Output Current vs. Output Voltage
3.4
3.38
80 3.36
70 3.34
60
50
40
30
20
10
0
0.001
VIN=5V, VOUT=3.3V, L1=2.2µF
VIN=12V, VOUT=5V, L1=6.8µF
VIN=12V, VOUT=3.3V, L1=4.7µF
VIN=5V, VOUT=1.2V, L1=2.2µF
VIN=12V, VOUT=2V, L1=3.3µF
0.01
0.1
1
Output Current, IOUT(A)
10
3.32
3.3
3.28
3.26
3.24
3.22
3.2
0
12
Output Current, IOUT(A)
3
Current Limit Level (Peak Current)
vs. Junction Temperature
7
Output Voltage vs. Supply Voltage
3.4
3.38 IOUT=500mA
7.5 3.36
3.34
7 3.32
3.3
6.5 3.28
3.26
6 3.24
www.DataSheet4U.com
5.5
-40 -20 0 20 40 60 80 100 120 140
Junction Temperature, TJ (oC)
3.22
3.2
4
6 8 10 12
Supply Voltage, VIN (V)
14
VIN Input Current vs. Supply Voltage
2.0
VFB=0.85V
1.5
Reference Voltage vs. Junction Temperature
0.816
0.812
0.808
0.804
1.0 0.800
0.796
0.5 0.792
0.788
0.0
0
24
6 8 10 12 14
Supply Voltage, VIN (V)
Copyright © ANPEC Electronics Corp.
Rev. A.3- Sep., 2008
5
0.784
-50 -25 0
25 50 75 100 125 150
Junction Temperature, TJ (oC)
www.anpec.com.tw
5 Page 
APW7145
Typical Application Circuit
1. 4.3~14V Single Power Input Step-down Converter (with a Ceramic Output Capacitor)
2
VIN
Enable
6
Shutdown
5
EN LX
U1 LX
APW7145
PGND
COMP
9
7
8
R3
( 5%)
C3
( 30%)
FB 4
AGND
3
R2
1%
C1
L1
3A
R1
1%
C4
( 30%, Optional)
VIN
VOUT
C2
a. Cost-effective Feedback Compensation (C4 is no connection)
V IN(V)
12
12
12
12
12
www.DataSheet41U2.com
12
12
5
5
5
5
5
5
5
5
V OUT(V)
5
5
3.3
3.3
2
2
1.8
1.8
3.3
3.3
1.8
1.8
1.5
1.5
1.2
1.2
L1(µF)
6.8
6.8
4.7
4.7
3.3
3.3
3.3
3.3
2.2
2.2
2.2
2.2
2.2
2.2
2.2
2.2
C2(µF)
22
44
22
44
22
44
22
44
22
44
22
44
22
44
22
44
C2 ESR(mΩ)
5
3
5
3
5
3
5
3
5
3
5
3
5
3
5
3
R1(kΩ)
63.0
63.0
46.9
46.9
30.0
30.0
18.8
18.8
46.9
46.9
25.0
25.0
21.9
21.9
7.5
7.5
R2(kΩ)
12
12
15
15
20
20
15
15
15
15
20
20
25
25
15
15
R3(kΩ)
33.0
68.0
27.0
56.0
18.0
33.0
15.0
30.0
27.0
56.0
15.0
30.0
12.0
24.0
10.0
20.0
C3(pF)
820
820
1000
1000
1800
1800
1800
1800
470
470
820
820
1000
1000
1200
1200
Copyright © ANPEC Electronics Corp.
Rev. A.3- Sep., 2008
11
www.anpec.com.tw
11 Page | ||
| Páginas | Total 23 Páginas | |
| PDF Descargar | [ Datasheet APW7145.PDF ] | |
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