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TC2574

更新时间： 2024-09-09 08:27:23
品牌 Logo 应用领域
TELCOM 稳压器开关
页数 文件大小 规格书
25页 216K
描述
0.5A Step-Down Switching Regulator

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TC2574  
0.5A Step-Down Switching Regulator  
GENERAL DESCRIPTION  
FEATURES  
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.  
■ 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  
APPLICATIONS  
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  
outputloadconditions,and±10%ontheoscillatorfrequency  
(±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.  
■ 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  
NC  
1
2
3
4
5
6
7
8
16  
15  
14  
13  
NC  
NC  
ORDERING INFORMATION  
Part  
Temperature  
Range  
Number  
Package  
FB  
SIG GND  
ON/OFF  
OUTPUT  
NC  
TC2574-3.3VPA  
TC2574-5.0VPA  
8-Pin PDIP (Narrow) –40 to +125°C  
8-Pin PDIP (Narrow) –40 to +125°C  
TC2574  
12 V  
IN  
TC2574-12.0VPA 8-Pin PDIP (Narrow) –40 to +125°C  
PWR GND  
NC  
NC  
NC  
11  
10  
9
TC2574-VPA*  
TC2574-VOE*  
8-Pin PDIP (Narrow) –40 to +125°C  
16-Pin SOIC (Wide) –40 to +125°C  
NC  
NC  
Note: *ADJ = 1.23 To 37V.  
8-Pin PDIP (Narrow)  
FB  
SIG GND  
ON/OFF  
8
NC  
1
2
3
4
7
OUTPUT  
NC  
TC2574  
6
V
5
PWR GND  
IN  
TelCom Semiconductor reserves the right to make changes in the circuitry an1d specifications of its devices.  
TC2574-1 1/6/00  
1234567...25

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