NCP1521B PDF даташит
Спецификация NCP1521B изготовлена «ON Semiconductor» и имеет функцию, называемую «Step-Down DC-DC Converter». |
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Детали детали
Номер произв | NCP1521B |
Описание | Step-Down DC-DC Converter |
Производители | ON Semiconductor |
логотип |
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NCP1521B
1.5 MHz, 600 mA
Step−Down DC−DC
Converter
High−Efficiency, Low Ripple, Adjustable
Output Voltage
The NCP1521B 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 part is available in adjustable
output voltage versions ranging 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 1.5 MHz (nominal)
oscillator which reduces component size by allowing smaller
inductors 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 NCP1521B is
available in space saving, low profile TSOP5 and UDFN6 packages.
Features
• Up to 96% Efficiency
• Best−In−Class Ripple, including PFM Mode
• Sources up to 600 mA
• 1.5 MHz Switching Frequency
• Adjustable Output Voltage from 0.9 V to 3.3 V www.DataSheet4U.com
• Synchronous Rectification for Higher Efficiency
• 2.7 V to 5.5 V Input Voltage Range
• Low Quiescent Current
• Shutdown Current Consumption of 0.3 mA
• Thermal Limit Protection
• Short Circuit Protection
• All Pins are Fully ESD Protected
• This is a Pb−Free Device
Typical Applications
• Cellular Phones, Smart Phones and PDAs
• Digital Still/Video Cameras
• MP3 Players and Portable Audio Systems
• Wireless and DSL Modems
• Portable Equipment
• USB Powered Devices
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MARKING
DIAGRAM
5
1
TSOP−5
SN SUFFIX
CASE 483
5
DBPAYWG
G
1
DBP = 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
ZCMG
6
5
3G4
ZC = Specific Device Code
M = Date Code
G = Pb−Free Package
(Note: Microdot may be in either location)
ORDERING INFORMATION
Device
NCP1521BSNT1G
NCP1521BMUTBG
Package
Shipping†
TSOP−5 3000/Tape & Reel
(Pb−Free)
UDFN6 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
2 GND
3 EN
LX 5
FB 4
L
COUT
Figure 1. Typical Application − TSOP−5
VOUT
R1
R2
OFF ON
Cff
1 EN FB 6
2 GND LX 5
R2
2.2 mH R1
3 VIN GND 4
18 pF
VOUT
10 mF
4.7 mF
VIN
Figure 2. Typical Application − UDFN6
© Semiconductor Components Industries, LLC, 2007
March, 2007 − Rev. 0
1
Publication Order Number:
NCP1521B/D
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100%
95%
90%
85%
80%
75%
70%
65%
60%
55%
50%
0
NCP1521B
VOUT = 3.3 V
VIN = 4.2 V
TA = 25°C
100 200 300 400 500 600 700
IOUT (mA)
Figure 3. Efficiency vs. Output Current
Vbattery
VIN
1
4.7 mF
GND
2
Q1
Q2
PWM/PFM
CONTROL
ILIMIT
Enable
EN
3
LOGIC
CONTROL
& THERMAL
SHUTDOWN
REFERENCE
VOLTAGE
LX 2.2 mH
5
10 mF
R1
18 pF
FB
4
R2
Figure 4. Simplified Block Diagram
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NCP1521B
PIN FUNCTION DESCRIPTION
Pin No.
TSOP5
Pin No.
UDFN6
Pin Name
1 3 VIN
2 2, 4 GND
3 1 EN
4 6 FB
5 5 LX
Type
Analog /
Power Input
Analog /
Power Ground
Digital Input
Analog Input
Analog Output
Description
Power supply input for the PFET power stage, analog and digital blocks. The
pin must be decoupled to ground by a 4.7 mF ceramic capacitor.
This pin is the GND reference for the NFET power stage and the analog sec-
tion of the IC. The pin must be connected to the system ground.
Enable for switching regulators. This pin is active HIGH and is turned off by
logic LOW on this pin. Do not left this pin floating.
Feedback voltage from the output of the power supply. This is the input to the
error amplifier.
Connection from power MOSFETs to the Inductor.
PIN CONNECTIONS
VIN 1
5 LX
GND 2
EN 3
4 FB
(Top View)
Figure 5. Pin Connections − TSOP5
EN 1
GND 2
VIN 3
6 FB
5 LX
4 GND
Figure 6. Pin Connections − UDFN6
MAXIMUM RATINGS
Rating
Symbol
Value
Unit
Minimum Voltage All Pins
Maximum Voltage All Pins (Note 2)
Maximum Voltage Enable, FB, LX
Thermal Resistance, Junction −to−Air
(with Recommended Soldering Footprint)
TSOP5
UDFN6
Vmin
Vmax
Vmax
RqJA
−0.3
7.0
VIN + 0.3
300
260
V
V
V
°C/W
Operating Ambient Temperature Range
Storage Temperature Range
Junction Operating Temperature
Latch−up Current Maximum Rating (TA = 85°C) (Note 4)
ESD Withstand Voltage (Note 3)
Human Body Model
Machine Model
TA
Tstg
Tj
Lu
Vesd
−40 to 85
−55 to 150
−40 to 125
$100
2.0
200
°C
°C
°C
mA
kV
V
Moisture Sensitivity Level (Note 5)
MSL
1 per IPC
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the
Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect
device reliability.
1. Maximum electrical ratings are defined as those values beyond which damage to the device may occur at TA = 25°C.
2. According to JEDEC standard JESD22−A108B.
3. This device series contains ESD protection and exceeds the following tests:
Human Body Model (HBM) per JEDEC standard: JESD22−A114.
Machine Model (MM) per JEDEC standard: JESD22−A115.
4. Latchup current maximum rating per JEDEC standard: JESD78.
5. JEDEC Standard: J−STD−020A.
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