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TC2574-VOE 参数 Datasheet PDF下载

TC2574-VOE图片预览
型号: TC2574-VOE
PDF下载: 下载PDF文件 查看货源
内容描述: 0.5A降压型开关稳压器 [0.5A Step-Down Switching Regulator]
分类和应用: 稳压器开关光电二极管
文件页数/大小: 25 页 / 216 K
品牌: TELCOM [ TELCOM SEMICONDUCTOR, INC ]
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0.5A Step-Down Switching Regulator
TC2574
TC2574
0.5A Step-Down Switching Regulator
FEATURES
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3.3V, 5.0V, 12V 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 40V
Requires Only 4 External Components
52kHz Fixed Frequency Internal Oscillator
TTL Shutdown Capability, Low Power Standby Mode
High Efficiency
Uses Readily Available Standard Inductors
Thermal Shutdown and Current Limit Protection
GENERAL DESCRIPTION
The TC2574 series of regulators are monolithic inte-
grated 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 0.5A load with
excellent line and load regulation. These devices are avail-
able in fixed output voltages of 3.3V, 5.0V, 12V and
an adjustable output version.
These regulators were designed to minimize the num-
ber of external components to simplify the power supply
design. Standard series of inductors optimized for use with
the TC2574 are offered by several different inductor manu-
facturers.
Since the TC2574 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 TC2574 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 TC2574 features include a guaranteed
±4%
toler-
ance 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 60µA (typical) standby current. The output switch
includes cycle–by–cycle current limiting, as well as thermal
shutdown for full protection under fault conditions.
APPLICATIONS
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Simple and High–Efficiency Step–Down (Buck)
Regulator
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
PIN CONFIGURATIONS
16-Pin SOIC (Wide)
NC 1
NC 2
FB 3
SIG GND 4
ON/OFF
5
16 NC
15 NC
14 OUTPUT
ORDERING INFORMATION
Part
Number
TC2574-3.3VPA
TC2574-5.0VPA
TC2574-12.0VPA
TC2574-VPA*
TC2574-VOE*
Package
8-Pin PDIP (Narrow)
8-Pin PDIP (Narrow)
8-Pin PDIP (Narrow)
8-Pin PDIP (Narrow)
16-Pin SOIC (Wide)
Temperature
Range
–40 to +125°C
–40 to +125°C
–40 to +125°C
–40 to +125°C
–40 to +125°C
TC2574
13 NC
12 VIN
11 NC
10 NC
9 NC
PWR GND 6
NC 7
NC 8
Note: *ADJ = 1.23 To 37V.
8-Pin PDIP (Narrow)
FB 1
SIG GND 2
ON/OFF 3
PWR GND 4
8 NC
7 OUTPUT
TC2574
6 NC
5 VIN
TC2574-1 1/6/00
1
TelCom Semiconductor reserves the right to make changes in the circuitry and specifications of its devices.