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CM2596-ADJ fiches techniques PDF

COSMOS WEALTH - 3A STEP-DOWN VOLTAGE REGULATOR

Numéro de référence CM2596-ADJ
Description 3A STEP-DOWN VOLTAGE REGULATOR
Fabricant COSMOS WEALTH 
Logo COSMOS WEALTH 





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CM2596-ADJ fiche technique
DATA
SHEET
20 AUGUST 2004
NO. _____
REV 1-04
PRELIMINARY
CM2596-XX SERIES 3A STEP-DOWN VOLTAGE REGULATORS
CM2596-xx series
3A STEP-DOWN VOLTAGE REGULATOR
REPLACEMENT OF:
LM 2596
CONTENTS
GENERAL DESCRIPTION, FEATURES AND
APPLICATIONS
PIN DESCRIPTION
INTERNAL BLOCK DIAGRAM
ABSOLUTE MAXIMUM RATINGS
OPERATING CONDITIONS
ELECTRICAL CHARACTERISTICS
CM 2596-3.3
CM 2596-5.0
CM 2596-12.0
CM 2596-ADJ
ALL OUTPUT VOLTAGE VERSIONS
ELECTRICAL CHARACTERISTICS (NOTES)
STANDARD TEST CIRCUITS AND LAYOUT GUIDES
APPLICATION INFORMATION
INPUT CAPACITOR
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CONTENTS
FEEDFORWARD CAPACITOR
CATCH DIODE
INDUCTOR SELECTION
DISCONTINUOUS MODE OPERATION
OUTPUT VOLTAGE RIPPLE AND TRANSIENTS
OPEN CORE INDUCTORS
THERMAL CONSIDERATIONS
DELAYED STARTUP
UNDERVOLTAGE LOCKOUT
INVERTING REGULATOR SHUTDOWN METHODS
PHYSICAL DIMENSIONS AND MARKING DIAGRAM
TO-220-5
TO-220-5h
TO-263-5
ORDERING INFORMATION
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GENERAL DESCRIPTION
The CM2596 series of regulators are monolithic
integrated circuits that provide all the active
functions for a step-down (buck) switching
regulator, capable of driving a 3A load with
excellent line and load regulation. These devices
are available in fixed output voltages of 3.3V, 5V,
12V, and an adjustable output version.
Requiring a minimum number of external
components, these regulators are simple to use
and include internal frequency compensation,
and a fixed-frequency oscillator.
The CM2596 series operates at a switching
frequency of 150 kHz thus allowing smaller sized
filter components than what would be needed
with lower frequency switching regulators.
Available in a standard 5-lead TO-220 package
with several different lead bend options, and a 5-
lead TO-263 surface mount package.
A standard series of inductors are available from
several different manufacturers optimized for
use with the CM2596 series. This feature greatly
simplifies the design of switch-mode power
supplies.
Other features include a guaranteed ±4%
tolerance on output voltage under specified input
voltage and output load conditions, and ±15% on
the oscillator frequency. External shutdown is
included, featuring typically 80 µA standby
current. Self protection features include a two
stage frequency reducing current limit for the
output switch and an over temperature shutdown
for complete protection under fault conditions.
1
FEATURES
3.3V, 5V, 12V, and adjustable output versions
Adjustable version output voltage range, 1.2V to
37V ±4% max over line and load conditions
Available in TO-220 and TO-263 packages
Guaranteed 3A output load current
Input voltage range up to 40V
Requires only 4 external components
Excellent line and load regulation
specifications
150 kHz fixed frequency internal oscillator
TTL shutdown capability
Low power standby mode, IQ typically 80 µA
High efficiency
Uses readily available standard inductors
Thermal shutdown and current limit
protection
APPLICATIONS
Simple high-efficiency step-down (buck) regulator
On-card switching regulators
Positive to negative converter

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