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PDF NCP1523 Data sheet ( Hoja de datos )
| Número de pieza | NCP1523 | |
| Descripción | Adjustable Output Voltage Stepdown Converter | |
| Fabricantes | ON Semiconductor | |
| Logotipo |  |
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NCP1523
3 MHz, 600 mA,
High−Efficiency, Adjustable
Output Voltage Stepdown
Converter
The NCP1523 stepdown PWM DC−DC converter is optimized for
portable applications powered from 1−cell Li−ion or 3−cell
Alkaline/NiCd/NiMH batteries. The device is available in an
adjustable output voltage from 0.9 V to 2.3 V. It uses synchronous
rectification to increase efficiency and reduce external part count. The
device also has a built−in 3 MHz (nominal) oscillator which reduces
component size by allowing a small inductor and capacitors.
Automatic switching PWM/PFM mode offers improved system
efficiency.
Finally, it includes an integrated soft−start, cycle−by−cycle current
limiting, and thermal shutdown protection. The NCP1523 is available
in a space saving, 8 pin chip scale package.
Features
• Up to 93% Efficiency
• Sources up to 600 mA
• 3 MHz Switching Frequency
• Adjustable Output Voltage from 0.9 V to 2.3 V
• 60 mA Quiescent Current
• Synchronous Rectification for Higher Efficiency.
• 2.7 V to 5.5 V Input Voltage Range
• Thermal Limit Protection
• Shutdown Current Consumption of 0.3 mA
• This is a Pb−Free Device*
Typical Applications
• Cellular Phones, Smart Phones and PDAs
• Digital Still Cameras
• MP3 Players and Portable Audio Systems
• Wireless and DSL Modems
• Portable Equipment
VIN
A2 VIN
SW B1
L
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MARKING
DIAGRAM
NCP1523G
A1 AYWW
FLIP−CHIP−8
CASE 766AE
A1
A = Assembly Location
Y = Year
WW = Work Week
G = Pb−Free Package
A1 A2
B1 B2
C1 C3
D1 D2
Top View
(Bumps Below)
PIN:
A1 − GND
A2 − VIN
B1 − SW
B2 − EN
C1 − GND
C2 − ADJ
D1 − VOUT
D2 − FB
ORDERING INFORMATION
Device
Package
Shipping†
NCP1523FCT2G FLIP−CHIP−8
(Pb−Free)
3000 /
Tape * Reel
†For information on tape and reel specifications,
including part orientation and tape sizes, please
refer to our Tape and Reel Packaging Specifications
VOUT Brochure, BRD8011/D.
CIN C1
GND
VOUT D1
COUT
OFF ON
A1 GND
B2 EN
ADJ C2
FB D2
R1
Figure 1. NCP1523 Typical Applications
R2
*For additional information on our Pb−Free strategy
and soldering details, please download the
ON Semiconductor Soldering and Mounting
Techniques Reference Manual, SOLDERRM/D.
© Semiconductor Components Industries, LLC, 2006
August, 2006 − Rev. 0
DataSheet4 U .com
1
Publication Order Number:
NCP1523/D
1 page  
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NCP1523
100
90
80
70
60
50
40
30
20
10
0
2.5
EN = VIN
IOUT = 0 mA
3.0 3.5 4.0 4.5 5.0
VIN, INPUT VOLTAGE (V)
Figure 4. Quiescent Current vs. Supply
Voltage
5.5
100
90
80
70
60
50
40
VIN = 5.5 V
VIN = 2.7 V
30
20
10
0
−40 10
60 110
TEMPERATURE (°C)
Figure 5. Quiescent Current vs. Temperature
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
2.5
EN = GND
IOUT = 0 mA
3.0 3.5 4.0 4.5 5.0 5.5
VIN, INPUT VOLTAGE (V)
Figure 6. Shutdown Current vs. Supply
Voltage
100
90 −40°C
80
70 25°C
60 105°C
50
40
30
1 10 100 1000
IOUT, OUTPUT CURRENT (mA)
Figure 8. Efficiency vs. Output Current
(VOUT = 0.9 V, VIN = 3.6 V)
100
90
80
70
60
50
40
30
1
100
90
80
70
60
50
40
30
1
−40°C
25°C
105°C
10 100
IOUT, OUTPUT CURRENT (mA)
Figure 7. Efficiency vs. Output Current
(VOUT = 1.8 V, VIN = 3.6 V)
1000
−40°C
105°C
25°C
10 100 1000
IOUT, OUTPUT CURRENT (mA)
Figure 9. Efficiency vs. Output Current
VOUT = 2.0 V, VIN = 3.6 V)
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NCP1523
VIN
EN
ADJ
R1
220k
FB
R2
220k
Figure 20. NCP1523 Board Layout
U1
A2 VIN
B2
EN
C2 ADJ
D2 FB
NCP1523
GND A1
SW D1
GND C1
VOUT D1
SW L1 VOUT
2.2 mH
TP3
VOUT
C2
4.7 mF
B2
VOUT
B1
VIN 1 VIN
2
TP1
VIN
C1
4.7 mF
J1
S1 1
2
3
TP2
EN
VIN
G1
EN
EN
11
JMP1
JMP2
JMP
JMP
22
Figure 21. NCP1523 Board Schematic
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11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet NCP1523.PDF ] | |
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