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NCV2574 PDF даташит

Спецификация NCV2574 изготовлена ​​​​«ON Semiconductor» и имеет функцию, называемую «Step-Down Switching Regulator».

Детали детали

Номер произв NCV2574
Описание Step-Down Switching Regulator
Производители ON Semiconductor
логотип ON Semiconductor логотип 

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NCV2574 Даташит, Описание, Даташиты
LM2574, NCV2574
0.5 A, Adjustable Output
Voltage, Step-Down
Switching Regulator
The LM2574 series of regulators are monolithic integrated circuits
ideally suited for easy and convenient design of a step−down
switching regulator (buck converter). All circuits of this series are
capable of driving a 0.5 A load with excellent line and load regulation.
These devices are available in fixed output voltages of 3.3 V, 5.0 V,
12 V, 15 V, and an adjustable output version.
These regulators were designed to minimize the number of external
components to simplify the power supply design. Standard series of
inductors optimized for use with the LM2574 are offered by several
different inductor manufacturers.
Since the LM2574 converter is a switch−mode power supply, its
efficiency is significantly higher in comparison with popular
three−terminal linear regulators, especially with higher input voltages.
In most cases, the power dissipated by the LM2574 regulator is so low,
that the copper traces on the printed circuit board are normally the only
heatsink needed and no additional heatsinking is required.
The LM2574 features include a guaranteed ±4% tolerance on output
voltage within specified input voltages and output load conditions, and
±10% on the oscillator frequency (±2% over 0°C to +125°C). External
shutdown is included, featuring 60 mA (typical) standby current. The
output switch includes cycle−by−cycle current limiting, as well as
thermal shutdown for full protection under fault conditions.
Features
3.3 V, 5.0 V, 12 V, 15 V, and Adjustable Output Versions
Adjustable Version Output Voltage Range, 1.23 to 37 V ±4% max
over Line and Load Conditions
Guaranteed 0.5 A Output Current
Wide Input Voltage Range: 4.75 to 40 V
Requires Only 4 External Components
52 kHz Fixed Frequency Internal Oscillator
TTL Shutdown Capability, Low Power Standby Mode
High Efficiency
Uses Readily Available Standard Inductors
Thermal Shutdown and Current Limit Protection
NCV Prefix for Automotive and Other Applications Requiring Site
www.onsemi.com
16
1
8
1
SO−16 WB
DW SUFFIX
CASE 751G
PDIP−8
N SUFFIX
CASE 626
PIN CONNECTIONS
*1
*2
FB 3
Sig Gnd 4
ON/OFF 5
Pwr Gnd 6
*7
*8
16 *
15 *
14 Output
13 *
12 Vin
11 *
10 *
9*
(Top View)
FB 1
Sig Gnd 2
ON/OFF 3
Pwr Gnd 4
8*
7 Output
6*
5 Vin
(Top View)
* No internal connection, but should be soldered to
* PC board for best heat transfer.
and Control Changes
Pb−Free Packages are Available*
Applications
Simple and High−Efficiency Step−Down (Buck) Regulators
Efficient Pre−regulator for Linear Regulators
On−Card Switching Regulators
Positive to Negative Converters (Buck−Boost)
Negative Step−Up Converters
Power Supply for Battery Chargers
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 24 of this data sheet.
DEVICE MARKING INFORMATION
See general marking information in the device marking
section on page 24 of this data sheet.
*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, 2015
January, 2015 − Rev. 9
1
Publication Order Number:
LM2574/D









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NCV2574 Даташит, Описание, Даташиты
Unregulated
DC Input
Cin
LM2574, NCV2574
Typical Application (Fixed Output Voltage Versions)
7.0 - 40 V
Unregulated
DC Input
Cin
22 mF
Feedback
(3)
+Vin
LM2574
1 L1
330 mH
5 Output
(12)
(14) 7
D1
2 Sig 4 Pwr 3 ON/OFF 1N5819
Gnd Gnd
(4) (6) (5)
Cout
220 mF
5.0 V Regulated
Output 0.5 A Load
Representative Block Diagram and Typical Application
+Vin
5 (12)
3.1 V Internal
Regulator
ON/OFF
1
Feedback
(3)
R2
Fixed Gain
Error Amplifier Comparator
Sig Gnd
2
(4)
R1
1.0 k Freq
Shift
18 kHz
1.235 V
Band-Gap
Reference
52 kHz
Oscillator
Current
Limit
Latch
Reset
Driver
1.0 Amp
Switch
Thermal
Shutdown
ON/OFF
3
(5)
Output
Voltage Versions
R2
(W)
3.3 V 1.7 k
5.0 V 3.1 k
12 V 8.84 k
15 V 11.3 k
For adjustable version
R1 = open, R2 = 0 W
Output
7 (14)
Pwr Gnd
4
(6)
L1 Vout
D1 Cout
Load
NOTE: Pin numbers in ( ) are for the SO−16W package.
Figure 1. Block Diagram and Typical Application
ABSOLUTE MAXIMUM RATINGS (Absolute Maximum Ratings indicate limits beyond which damage to the device may occur).
Rating
Symbol
Value
Unit
Maximum Supply Voltage
ON/OFF Pin Input Voltage
Output Voltage to Ground (Steady State)
Vin 45
− −0.3 V V +Vin
− −1.0
V
V
V
DW Suffix, Plastic Package Case 751G
Max Power Dissipation
Thermal Resistance, Junction−to−Air
N Suffix, Plastic Package Case 626
Max Power Dissipation
Thermal Resistance, Junction−to−Ambient
Thermal Resistance, Junction−to−Case
Storage Temperature Range
Minimum ESD Rating
(Human Body Model: C = 100 pF, R = 1.5 kW)
Lead Temperature (Soldering, 10 seconds)
PD
RqJA
PD
RqJA
RqJC
Tstg
Internally Limited
145
Internally Limited
100
5.0
−65°C to +150°C
2.0
260
W
°C/W
W
°C/W
°C/W
°C
kV
°C
Maximum Junction Temperature
TJ 150 °C
Stresses exceeding those listed in the Maximum Ratings table may damage the device. If any of these limits are exceeded, device functionality
should not be assumed, damage may occur and reliability may be affected.
NOTE: ESD data available upon request.
www.onsemi.com
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NCV2574 Даташит, Описание, Даташиты
LM2574, NCV2574
OPERATING RATINGS (Operating Ratings indicate conditions for which the device is intended to be functional, but do not guarantee
specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics).
Rating
Symbol
Value
Unit
Operating Junction Temperature Range
TJ
−40 to +125
°C
Supply Voltage
Vin 40 V
Functional operation above the stresses listed in the Recommended Operating Ranges is not implied. Extended exposure to stresses beyond
the Recommended Operating Ranges limits may affect device reliability.
SYSTEM PARAMETERS ([Note 1] Test Circuit Figure 16)
ELECTRICAL CHARACTERISTICS (Unless otherwise specified, Vin = 12 V for the 3.3 V, 5.0 V, and Adjustable
version, Vin = 25 V for the 12 V version, Vin = 30 V for the 15 V version. ILoad = 100 mA. For typical values TJ = 25°C, for min/max values
TJ is the operating junction temperature range that applies [Note 2], unless otherwise noted).
Characteristic
Symbol Min Typ Max Unit
LM2574−3.3 ([Note 1] Test Circuit Figure 16)
Output Voltage (Vin = 12 V, ILoad = 100 mA, TJ = 25°C)
Output Voltage (4.75 V Vin 40 V, 0.1 A ILoad 0.5 A)
TJ = 25°C
TJ = −40 to +125°C
Efficiency (Vin = 12 V, ILoad = 0.5 A)
LM2574−5 ([Note 1] Test Circuit Figure 16)
Output Voltage (Vin = 12 V, ILoad = 100 mA, TJ = 25°C)
Output Voltage (7.0 V Vin 40 V, 0.1 A ILoad 0.5 A)
TJ = 25°C
TJ = −40 to +125°C
Efficiency (Vin = 12 V, ILoad = 0.5 A)
Vout 3.234 3.3 3.366 V
Vout
V
3.168 3.3 3.432
3.135 − 3.465
η − 72 − %
Vout 4.9 5.0 5.1 V
Vout
V
4.8 5.0 5.2
4.75 5.25
η − 77 − %
LM2574−12 ([Note 1] Test Circuit Figure 16)
Output Voltage (Vin = 25 V, ILoad = 100 mA, TJ = 25°C)
Output Voltage (15 V Vin 40 V, 0.1 A ILoad 0.5 A)
TJ = 25°C
TJ = −40 to +125°C
Efficiency (Vin = 15 V, ILoad = 0.5 A)
Vout 11.76 10 12.24 V
Vout
V
11.52 12 12.48
11.4 − 12.6
η − 88 − %
LM2574−15 ([Note 1] Test Circuit Figure 16)
Output Voltage (Vin = 30 V, ILoad = 100 mA, TJ = 25°C)
Vout 14.7 15 15.3 V
Output Voltage (18 V < Vin < 40 V, 0.1 A < ILoad < 0.5 A)
TJ = 25°C
TJ = −40 to +125°C
Efficiency (Vin = 18 V, ILoad = 0.5 A)
Vout
V
14.4 15 15.6
14.25
15.75
η − 88 − %
LM2574 ADJUSTABLE VERSION ([Note 1] Test Circuit Figure 16)
Feedback Voltage Vin = 12 V, ILoad = 100 mA, Vout = 5.0 V, TJ = 25°C
VFB
1.217 1.23 1.243
V
Feedback Voltage 7.0 V Vin 40 V, 0.1 A ILoad 0.5 A, Vout = 5.0
V
TJ = 25°C
TJ = −40 to +125°C
VFBT
1.193 1.23 1.267
1.18 1.28
V
Efficiency (Vin = 12 V, ILoad = 0.5 A, Vout = 5.0 V)
η − 77 − %
Product parametric performance is indicated in the Electrical Characteristics for the listed test conditions, unless otherwise noted. Product
performance may not be indicated by the Electrical Characteristics if operated under different conditions.
1. External components such as the catch diode, inductor, input and output capacitors can affect the switching regulator system performance.
When the LM2574 is used as shown in the Figure 16 test circuit, the system performance will be as shown in the system parameters section
of the Electrical Characteristics.
2. Tested junction temperature range for the LM2574, NCV2574: Tlow = −40°C Thigh = +125°C.
www.onsemi.com
3










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Номер в каталогеОписаниеПроизводители
NCV2574Step-Down Switching RegulatorON Semiconductor
ON Semiconductor
NCV2575Step-Down Switching RegulatorON Semiconductor
ON Semiconductor

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