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부품번호 | NCP1522 기능 |
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기능 | Adjustable Output Voltage Step-Down Converter | ||
제조업체 | ON Semiconductor | ||
로고 | |||
전체 17 페이지수
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NCP1522
3.0 MHz, 600 mA,
High−Efficiency, Low
Quiescent Current,
Adjustable Output Voltage
Step−Down Converter
The NCP1522 step−down PWM DC−DC converter is optimized
for portable applications powered from one cell Li−ion or three cell
Alkaline/NiCd/NiMH batteries. The device is available in an
adjustable output voltage from 0.9 V to 3.3 V. It uses synchronous
rectification to increase efficiency and reduce external part count.
The device also has a built−in 3.0 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 NCP1522 is
available in a space saving, low profile TSOP5 package.
Features
• 93.8% of Efficiency for 3.3 V Output and 4.5 V Input and 120 mA
Load Current
• Sources up to 600 mA
• 3.0 MHz Switching Frequency
• Adjustable Output Voltage from 0.9 V to 3.3 V
• 60 mA Quiescent Current (Typ)
• 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
• Short Circuit Protection
• This is a Pb−Free Device
Typical Applications
• Cellular Phones, Smart Phones and PDAs
• MP3 Players and Portable Audio Systems
• Wireless and DSL Modems
• Portable Equipment
• USB Powered Devices
• Digital Still/Video Cameras
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5
1
TSOP−5
ASN SUFFIX
CASE 483
MARKING
DIAGRAM
5
DBRAYWG
G
1
A = Assembly Location
Y = Year
W = Work Week
G = Pb−Free Package
(Note: Microdot may be in either location)
PIN CONNECTIONS
VIN 1
GND 2
EN 3
5 LX
4 FB
(Top View)
ORDERING INFORMATION
Device
Package
Shipping
NCP1522ASNT1G TSOP−5 3000/Tape & Reel
(Pb−Free)
†For information on tape and reel specifications,
including part orientation and tape sizes, please
refer to our Tape and Reel Packaging Specification
Brochure, BRD8011/D.
VIN
CIN
OFF ON
1 VIN LX 5
2 GND
3 EN
FB 4
L
COUT
VOUT
R1 Cff
R2
Figure 1. Typical Application
© Semiconductor Components Industries, LLC, 2006
August, 2006 − Rev. 3
1
Publication Order Number:
NCP1522/D
NCP1522
ELECTRICAL CHARACTERISTICS (Typical values are referenced to TA = +25°C, Min and Max values are referenced −40°C to
+85°C ambient temperature, unless otherwise noted, operating conditions VIN = 3.6 V, VOUT = 1.8 V, unless otherwise noted.)
Characteristic
Symbol
Min
Typ
Max Unit
Input Voltage Range
Undervoltage Lockout (VIN Falling)
Quiescent Current (PFM No Load)
Standby Current, EN Low
VIN 2.7 − 5.5 V
VUVLO
2.3
2.5
2.6 V
Iq − 60 95 mA
Istb − 0.3 1.2 mA
Oscillator Frequency
Peak Inductor Current
Feedback Reference Voltage
FB Pin Tolerance
Fosc
ILIM
Vref
VFBtol
2.400
−
−
−3.0
3.0
1200
0.6
−
3.600
−
−
3.0
MHz
mA
V
%
Reference Voltage Line Regulation
DVFB
−
0.1
−%
Output Voltage Accuracy (Note 4)
Minimum Output Voltage
Maximum Output Voltage
Output Voltage Line Regulation (Vin = 2.7–5.5)
Io = 200 mA
VOUT
VOUT
VOUT
DVOUT
−3%
−
−
−
Vnom
0.9
3.3
0.1
+3%
−
−
−
V
V
V
%
Voltage Load Regulation
(IO = 200 mA to 300 mA)
(IO = 200 mA to 600 mA)
VLOADREG
−
−
0.0005
0.001
− %/mA
− %/mA
Load Transient Response (300 mA to 600 mA Load Step, Trise 1.0 ms)
Duty Cycle
VOUT
−
−
−
35 − mV
− 100 %
P−Ch On−Resistance
RLxH − 300 − mW
N−Ch On−Resistance
RLxL − 300 − mW
P−Ch Leakage Current
ILeakH
−
0.05
− mA
N−Ch Leakage Current
ILeakL
−
0.01
− mA
Enable Pin High
VENH
1.2
−
−V
Enable Pin Low
VENL
−
− 0.4 V
EN << H >> Input Current, EN = 3.6 V
IENH
−
2.0
− mA
Soft−Start Time
Tstart
−
Thermal Shutdown Threshold
TSD −
Thermal Shutdown Hysteresis
TSDH
−
4. The overall output voltage tolerance depends upon the accuracy of the external resistor (R1, R2).
350
160
25
500 ms
− °C
− °C
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4
4페이지 NCP1522
2.0
1.5
1.0 IOUT = 100 mA
0.5
0.0 IOUT = 300 mA
−0.5
−1.0
IOUT = 600 mA
−1.5
VIN = 3.6 V
−2.0
−50 0
50 100
TEMPERATURE (°C)
Figure 16. Output Voltage Accuracy
(VOUT = 0.9 V)
2.0
1.5
1.0
IOUT = 100 mA
0.5
0.0 IOUT = 300 mA
−0.5
−1.0
IOUT = 600 mA
−1.5
VIN = 3.6 V
−2.0
150 −50
0
50 100
TEMPERATURE (°C)
Figure 17. Output Voltage Accuracy
(VOUT = 1.8 V)
150
2.0
1.5
1.0
0.5
0.0
−0.5
IOUT = 100 mA
IOUT = 300 mA
IOUT = 600 mA
−1.0
−1.5
VIN = 4.0 V
−2.0
−50 0
50 100
TEMPERATURE (°C)
Figure 18. Output Voltage Accuracy
(VOUT = 3.3 V)
150
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