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LM2574-3.3 Datasheet

  • LM2574-3.3

  • EASY SWITCHERE⑩ 0.5 A STEP-DOWN VOLTAGE REGULATOR

  • 24頁

  • MOTOROLA   MOTOROLA

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Advance Information
LM2574
Easy Switcher
鈩?/div>
0.5 A
Step-Down Voltage Regulator
The LM2574 series of regulators are monolithic integrated circuits ideally
suited for easy and convenient design of a step鈥揹own 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鈥搈ode power supply, its efficiency
is significantly higher in comparison with popular three鈥搕erminal 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
鹵4%
tolerance on output
voltage within specified input voltages and output load conditions, and
鹵10%
on the oscillator frequency (鹵2% over 0擄C to +125擄C). External shutdown is
included, featuring 60
碌A(chǔ)
(typical) standby current. The output switch
includes cycle鈥揵y鈥揷ycle current limiting, as well as thermal shutdown for full
protection under fault conditions.
Features
EASY SWITCHER鈩?/div>
0.5 A STEP鈥揇OWN
VOLTAGE REGULATOR
SEMICONDUCTOR
TECHNICAL DATA
8
1
N SUFFIX
PLASTIC PACKAGE
CASE 626
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
3.3 V, 5.0 V, 12 V, 15 V, and Adjustable Output Versions
Adjustable Version Output Voltage Range, 1.23 to 37 V
鹵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
PIN CONNECTIONS
FB
Sig Gnd
ON/OFF
Pwr Gnd
1
2
3
4
8
7
6
5
*
Output
*
Vin
(Top View)
* No internal connection, but should be soldered to
*
PC board for best heat transfer.
Applications
Simple and High鈥揈fficiency Step鈥揇own (Buck) Regulators
Efficient Pre鈥搑egulator for Linear Regulators
On鈥揅ard Switching Regulators
Positive to Negative Converters (Buck鈥揃oost)
Negative Step鈥揢p Converters
Power Supply for Battery Chargers
DEVICE TYPE/NOMINAL OUTPUT VOLTAGE
LM2574鈥?.3
LM2574鈥?
LM2574鈥?2
LM2574鈥?5
LM2574鈥揂DJ
3.3 V
5.0 V
12 V
15 V
1.23 V to 37 V
ORDERING INFORMATION
Device
Operating
Temperature Range
Package
DIP鈥?
LM2574N鈥揦X TA = 鈥?0擄 to +125擄C
XX = Voltage Option, i.e, 3.3, 5, 12, 15 V; and ADJ for
Adjustable Output.
This document contains information on a new product. Specifications and information herein
are subject to change without notice.
漏
Motorola, Inc. 1997
Rev 0

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