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PDF NCP1529 Data sheet ( Hoja de datos )
| Número de pieza | NCP1529 | |
| Descripción | Adjustable Output Voltage Step-down Converter | |
| Fabricantes | ON Semiconductor | |
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NCP1529
1.7MHz, 1A, High Efficiency,
Low Ripple, Adjustable
Output Voltage Step-down
Converter
The NCP1529 step−down DC−DC converter is a monolithic
integrated circuit for portable applications powered from one cell
Li−ion or three cell Alkaline/NiCd/NiMH batteries. The device is able
to deliver up to 1.0 A on an output voltage range externally adjustable
from 0.9 V to 3.9 V or fixed at 1.2 V or 1.35 V. It uses synchronous
rectification to increase efficiency and reduce external part count. The
device also has a built−in 1.7 MHz (nominal) oscillator which reduces
component size by allowing a small inductor and capacitors. Automatic
switching PWM/PFM mode offers improved system efficiency.
Additional features include integrated soft−start, cycle−by−cycle
current limiting and thermal shutdown protection.
The NCP1529 is available in a space saving, low profile
2x2x0.5 mm UDFN6 package and TSOP−5 package.
Features
• Up to 96% Efficiency
• Best In Class Ripple, including PFM mode
• Source up 1.0 A
• 1.7 MHz Switching Frequency
• Adjustable from 0.9 V to 3.9 V or Fixed at 1.2 V or 1.35 V
• Synchronous rectification for higher efficiency
www.DataSheet.net/
• 2.7 V to 5.5 V Input Voltage Range
• Low Quiescent Current 28 mA
• Shutdown Current Consumption of 0.3 mA
• Thermal Limit Protection
• Short Circuit Protection
• All Pins are Fully ESD Protected
• These are Pb−Free Devices
http://onsemi.com
MARKING
DIAGRAM
5
1
TSOP−5
SN SUFFIX
CASE 483
5
DXJAYWG
G
1
DXJ = Specific Device Code
A = Assembly Location
Y = Year
W = Work Week
G = Pb−Free Package
(Note: Microdot may be in either location)
UDFN6
MU SUFFIX
CASE 517AB
1
2
XXMG
6
5
3 G4
XX = Specific Device Code
M = Date Code
G = Pb−Free Package
(Note: Microdot may be in either location)
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 14 of this data sheet.
Typical Applications
• Cellular Phones, Smart Phones and PDAs
• Digital Still Cameras
• MP3 Players and Portable Audio Systems
• Wireless and DSL Modems
• USB Powered Devices
• Portable Equipment
VIN
CIN
VIN SW
L
COUT
VOUT
VIN
CIN
VIN SW
L
VOUT
COUT
OFF ON
EN FB
GND
R1 Cff OFF ON
R2
EN FB
GND
Figure 1. Typical Application for Adjustable Version
Figure 2. Typical Application for Fixed Version
© Semiconductor Components Industries, LLC, 2010
September, 2010 − Rev. 5
1
Publication Order Number:
NCP1529/D
Datasheet pdf - http://www.DataSheet4U.co.kr/
1 page  
NCP1529
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 = 1.2 V, unless otherwise noted.)
Rating
Conditions
Symbol Min Typ Max Unit
INPUT VOLTAGE
Input Voltage Range
Quiescent Current
Standby Current
Under Voltage Lockout
Under Voltage Hysteretis
ANALOG AND DIGITAL PIN
No Switching, No load
EN Low
VIN Falling
Vin 2.7 − 5.5
IQ − 28 39
ISTB
− 0.3 1.0
VUVLO 2.2 2.4 2.55
VUVLOH − 100 −
V
mA
mA
V
mV
Positive going Input High Voltage Threshold
Negative going Input High Voltage Threshold
EN Threshold Hysteresis
EN High Input Current
OUTPUT
EN = 3.6 V
VIH
VIL
VENH
IENH
1.2 −
−
− − 0.4
− 100 −
− 1.5 −
V
V
mV
mA
Feedback Voltage Level
Adjustable Version
Fixed Version at 1.2 V
Fixed Version at 1.35 V
VFB − 0.6 −
− 1.2 −
− 1.35 −
V
Output Voltage Range (Notes 10, 11)
Output Voltage Accuracy
USB or 5 V Rail Powered Applications
(VIN from 4.3 V to 5.5 V) (Note 12)
Room Temperature (Note 13)
Overtemperature Range
VOUT 0.9 − 3.3
0.9 − 3.9
DVOUT − $1 −
−3 $2 +3
V
%
Maximum Output Current (Note 10)
Output Voltage Load Regulation
Overtemperature
Load = 100 mA to 1000 mA (PWM Mode)
Load = 0 mA to 100 mA (PFM Mode)
IOUTMAX
VLOADR
1
−
−
−
−0.9
1.1
−
−
−
A
%
Load Transient Response
Rise/Fall Time 1 ms
10 mA to 100 mA Load Step
(PFM to PWM Mode) www.DataSheet.net/
200 mA to 600 mA Load Step
(PWM to PWM Mode)
VLOADT − 40 −
− 85 −
mV
Output Voltage Line Regulation Load = 100 mA VIN = 2.7 V to 5.5 V
Line Transient Response Load = 100 mA
3.6 V to 3.2 V Line Step (Fall Time = 50 ms)
Output Voltage Ripple
IOUT = 0 mA
IOUT = 300 mA
Switching Frequency
Duty Cycle
VLINER
VLINET
VRIPPLE
−
−
−
−
0.05
6.0
8.0
3.0
−
−
−
−
FSW
D
1.2 1.7 2.2
− − 100
%
mVPP
mVPP
MHz
%
Soft−Start Time
POWER SWITCHES
Time from EN to 90% of Output Voltage
tSTART − 310 500
ms
High−Side MOSFET On−Resistance
Low−Side MOSFET On−Resistance
High−Side MOSFET Leakage Current
Low−Side MOSFET Leakage Current
PROTECTION
RONHS − 400 −
RONLS − 300 −
ILEAKHS − 0.05 −
ILEAKLS − 0.01 −
mW
mW
mA
mA
DC−DC Short Circuit Protection
Peak Inductor Current
IPK − 1.6 −
A
Thermal Shutdown Threshold
TSD − 180 −
°C
Thermal Shutdown Hysteresis
TSDH − 40 −
°C
10. Functionality guaranteed per design and characterization.
11. Whole output voltage range is available for adjustable versions only. By topology, the maximum output voltage will be equal or lower than
the input voltage.
12. See chapter ”USB or 5 V Rail Powered Applications”.
13. For adjustable versions only, the overall output voltage tolerance depends upon the accuracy of the external resistor (R1 and R2). Specified
value assumes that external resistor have 0.1% tolerance.
http://onsemi.com
5
Datasheet pdf - http://www.DataSheet4U.co.kr/
5 Page 
NCP1529
Soft−Start
The NCP1529 uses soft−start to limit the inrush current
when the device is initially powered up or enabled. Soft start
is implemented by gradually increasing the reference
voltage until it reaches the full reference voltage. During
startup, a pulsed current source charges the internal
soft−start capacitor to provide gradually increasing
reference voltage. When the voltage across the capacitor
ramps up to the nominal reference voltage, the pulsed
current source will be switched off and the reference voltage
will switch to the regular reference voltage.
Cycle−by−cycle Current Limitation
From the block diagram, an ILIM comparator is used to
realize cycle−by−cycle current limit protection. The
comparator compares the SW pin voltage with the reference
voltage, which is biased by a constant current. If the inductor
current reaches the limit, the ILIM comparator detects the
SW voltage falling below the reference voltage and releases
the signal to turn off the switch Q1. The cycle−by−cycle
current limit is set at 1600 mA (nom).
Low Dropout Operation
The NCP1529 offers a low input to output voltage
difference. The NCP1529 can operate at 100% duty cycle.
In this mode the PMOS (Q1) remains completely ON. The
minimum input voltage to maintain regulation can be
calculated as:
ǒ ǒ ǓǓVout + VOUT(max) ) IOUT RDS(on)_RINDUCTOR
(eq. 1)
• VOUT: Output Voltage (V)
• IOUT: Max Output Current
• RDS(on): P−Channel Switch RDS(on)
• RINDUCTOR: Inductor Resistance (DCR)
Undervoltage Lockout
The Input voltage VIN must reach 2.4 V (typ) before the
NCP1529 enables the DC/DC converter output to begin the
start up sequence (see soft−start section). The UVLO
threshold hysteresis is typically 100 mV.
Shutdown Mode
Forcing this pin to a voltage below 0.4 V will shut down
the IC. In shutdown mode, the internal reference, oscillator
and most of the control circuitries are turned off. Therefore,
the typical current consumption will be 0.3 mA (typical
value). Applying a voltage above 1.2 V to EN pin will enable
the DC/DC converter for normal operation. The device will
go through soft−start to normal operation.
Thermal Shutdown
Internal Thermal Shutdown circuitry is provided to
protect the integrated circuit in the event that the maximum
junction Temperature is exceeded. If the junction
temperature exceeds 180°C, the device shuts down. In this
mode all power transistors and control circuits are turned
off. The device restarts in soft−start after the temperature
drops below 140°C. This feature is provided to prevent
catastrophic failures from accidental device overheating.
Short Circuit Protection
When the output is shorted to ground, the device limits the
inductor current. The duty−cycle is minimum and the
consumption on the input line is 550 mA (typ). When the
short circuit condition is removed, the device returns to the
normal mode of operation.
USB or 5 V Rail Powered Applications
For USB or 5 V rail powered applications, NCP1529 is
able to supply voltages up to 3.9 V, 600 mA, operating in
PWM mode only, with high efficiency (Figure 28), low
output voltage ripple and good load regulation results over
all current range (Figure 29).
100
95 −40°C
90
85
80 25°C
75 85°C
70
65
60
55
50
www.DataSheet.net/
45
40 0 200 400 600 800 1000
3.0
2.5
2.0
1.5
1.0
0.5
0.0
−0.5
−1.0
−1.5
−2.0
−2.5
−3.0
0
IOUT, OUTPUT CURRENT (mA)
Figure 28. Efficiency vs. Output Current
(VIN = 5.0 V, VOUT = 3.9 V)
−40°C
25°C
85°C
200 400 600 800 1000
IOUT, OUTPUT CURRENT (mA)
Figure 29. Load Regulation vs. Output Current
(VIN = 5.0 V, VOUT = 3.9 V)
http://onsemi.com
11
Datasheet pdf - http://www.DataSheet4U.co.kr/
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet NCP1529.PDF ] | |
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