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PDF APW7142 Data sheet ( Hoja de datos )
| Número de pieza | APW7142 | |
| Descripción | Synchronous-Rectified Buck Converter | |
| Fabricantes | Anpec Electronics Coropration | |
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APW7142
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
• 70mΩ 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
• Small SOP-8 Package
• Lead Free and Green Devices Available
www.DataSheet(4RUo.HcoSmCompliant)
The APW7142 is a 3A synchronous-rectified Buck con-
verter with integrated 70mΩ power MOSFETs. The
APW7142, designed with a current-mode control scheme,
can convert wide input voltage of 4.3V to 14V to the output
voltage adjustable from 0.8V to VIN to provide excellent
output voltage regulation.
For high efficiency over all load current range, the
APW7142 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 excel-
lent output voltage regulation.
The APW7142 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 in an 8-pin SOP-8 package, pro-
vides a very compact system solution with minimal exter-
nal components and PCB area.
Applications
• OLPC, UMPC
• Notebook Computer
• Handheld Portable Device
• Step-Down Converters Requiring High Efficiency
and 3A Output Current
100
90
80
70
60
50
40
30
20
10
0
0.001
VIN=12V, VOUT=3.3V, L1=4.7µF
VIN=12V, VOUT=5V, L1=6.8µF
VIN=5V, VOUT=3.3V, L1=2.2µF
0.01 0.1
1
Output Current, IOUT(A)
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.4 - Oct., 2008
1
www.anpec.com.tw
1 page  
APW7142
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
Output Voltage vs. Output Current
100
90
80
70
60
VIN=12V, VOUT=3.3V, L1=4.7µF
50
40
30 VIN=12V, VOUT=5V, L1=6.8µF
20
10 VIN=5V, VOUT=3.3V, L1=2.2µF
0
0.001
0.01
0.1
1
10
Output Current, IOUT(A)
Current Limit Level (Peak Current)
vs. Junction Temperature
7
6.5
6
5.5
5
www.DataSheet4U.com
4.5
-40 -20 0 20 40 60 80 100 120 140
Junction Temperature, TJ (oC)
3.4
3.38
3.36
3.34
3.32
3.3
3.28
3.26
3.24
3.22
3.2
0
12
Output Current, IOUT(A)
3
Output Voltage vs. Supply Voltage
3.4
3.38 IOUT=500mA
3.36
3.34
3.32
3.3
3.28
3.26
3.24
3.22
3.2
4 6 8 10 12 14
Supply Voltage, VIN (V)
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
2 4 6 8 10 12 14
Supply Voltage, VIN (V)
Copyright © ANPEC Electronics Corp.
Rev. A.4 - Oct., 2008
5
0.784
-50 -25 0 25 50 75 100 125 150
Junction Temperature, TJ (oC)
www.anpec.com.tw
5 Page 
APW7142
Typical Application Circuits
1. 4.3~14V Single Power Input Step-Down Converter (with a Ceramic Output Capacitor)
VIN
2 C1
VIN
Enable
6
EN
Shutdown
U1
LX 8
LX 7
L1
VOUT
APW7142
PGND
1
5 COMP
R1
C2
R3
5%
FB 4
1%
C3
30%
AGND
3
R2
1% C4
30%, Optional
a. Cost-effective Feedback Compensation (C4 is not connected)
VIN(V)
12
VOUT(V)
5
L1(µH)
6.8
C2(µF)
22
C2 ESR(mΩ)
5
R1(kΩ)
63.0
12 5 6.8 44
3 63.0
12 3.3 4.7 22
5 46.9
12 3.3 4.7 44
3 46.9
12 2 3.3 22
5 30.0
12 2 3.3 44
3 30.0
12 1.2 2.2 22
5 7.5
12 1.2 2.2 44
3 7.5
5 3.3 2.2 22
5 46.9
5 3.3 2.2 44
www.DataSheet4U.com
5 1.2 2.2 22
3 46.9
5 7.5
5 1.2 2.2 44
3 7.5
b. Fast-Transient-Response Feedback Compensation (C4 is connected)
VIN(V)
12
12
12
12
12
12
12
12
5
5
5
5
VOUT(V)
5
5
3.3
3.3
2
2
1.2
1.2
3.3
3.3
1.2
1.2
L1(µH)
6.8
6.8
4.7
4.7
3.3
3.3
2.2
2.2
2.2
2.2
2.2
2.2
C2(µF) C2 ESR(mΩ)
22 5
44 3
22 5
44 3
22 5
44 3
22 5
44 3
22 5
44 3
22 5
44 3
R1(kΩ)
63.0
63.0
46.9
46.9
30.0
30.0
7.5
7.5
46.9
46.9
7.5
7.5
R2(kΩ)
12
12
15
15
20
20
15
15
15
15
15
15
R2(kΩ)
12
12
15
15
20
20
15
15
15
15
15
15
C4(pF)
47
47
47
47
47
47
150
150
56
56
330
330
Copyright © ANPEC Electronics Corp.
Rev. A.4 - Oct., 2008
11
R3(kΩ)
10.0
20.0
10.0
22.0
10.0
20.0
8.2
16.0
8.2
20.0
3.0
7.5
C3(pF)
1500
1500
1500
1500
1500
1500
1800
1800
680
680
1800
1800
R3(kΩ)
33.0
68.0
22.0
47.0
13.0
27.0
7.5
15.0
20.0
43.0
3.3
8.2
C3(pF)
470
470
680
680
1200
1200
2200
2200
220
220
1800
1500
www.anpec.com.tw
11 Page | ||
| Páginas | Total 21 Páginas | |
| PDF Descargar | [ Datasheet APW7142.PDF ] | |
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