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參數資料
| 型號： | TC2576-3.3VAT |
| 元件分類： | 穩壓器 |
| 英文描述： | 7.5 A SWITCHING REGULATOR, 63 kHz SWITCHING FREQ-MAX, PSFM5 |
| 封裝： | TO-220, 5 PIN |
| 文件頁數： | 1/25頁 |
| 文件大小： | 213K |
| 代理商： | TC2576-3.3VAT |
TC2576
TC2576-2 12/04/00
2001 Microchip Technology Inc.
DS21399A
3.0A Step-Down Switching Regulator
GENERAL DESCRIPTION
The TC2576 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 3.0A load with
excellent line and load regulation. These devices are avail-
able in fixed output voltages of 3.3V, 5.0V, 12.0V 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 TC2576 are offered by several different inductor manu-
facturers.
Since the TC2576 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 many cases, the power dissipated
is so low, that no heatsinking is required or its size can be
reduced dramatically.
A standard series of inductors optimized for use with the
TC2576 are available from several different manufacturers.
This feature greatly simplifies the design of switch-mode
power supplies.
The TC2576 features include a guaranteed
±4% toler-
ance on output voltage within specified input voltages and
output load conditions, and
±10% on the oscillator fre-
quency (
±2% over 0°C to +125°C). External shutdown is
included, featuring 80
A (typical) standby current. The
output switch includes cycle-by-cycle current limiting, as
well as thermal shutdown for full protection under fault
conditions.
FEATURES
s
3.3V, 5.0V, 12V and Adjustable Output Versions
s
Adjustable Version Output Voltage Range:
1.23 to 37V
±4% Max. Over Line and Load Conditions
s
Guaranteed 3.0A Output Current
s
Wide Input Voltage Range
s
Requires Only 4 External Components
s
52kHz Fixed Frequency Internal Oscillator
s
TTL Shutdown Capability, Low Power Standby Mode
s
High Efficiency
s
Uses Readily Available Standard Inductors
s
Thermal Shutdown and Current Limit Protection
APPLICATIONS
s
Simple and High-Efficiency Step-Down (Buck)
Regulator
s
Efficient Pre–Regulator for Linear Regulators
s
On–Card Switching Regulators
s
Positive to Negative Converters (Buck–Boost)
s
Negative Step-Up Converters
s
Power Supply for Battery Chargers
ORDERING INFORMATION
Part
Temperature
Number
Package
Range
TC2576-3.3VAT
5-Pin TO-220
–40 to +125
°C
TC2576-5.0VAT
5-Pin TO-220
–40 to +125
°C
TC2576-12.0VAT
5-Pin TO-220
–40 to +125
°C
TC2576VAT*
5-Pin TO-220
–40 to +125
°C
PIN CONFIGURATIONS
5-Pin TO-220
Note: *ADJ = 1.23 To 37V.
GND
V
IN
OUTPUT
FEEDBACK
ON/OFF
1 2 34 5
TC2576
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