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COSMOS WEALTH

CM2596-ADJ Datasheet Preview

CM2596-ADJ Datasheet

3A STEP-DOWN VOLTAGE REGULATOR

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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
Page
1
2
2
2
2
3
3
3
3
3
3
4
4
5
5
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
Page
5
6
6
7
7
8
9
9
10
11
12
12
12
12
13
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




COSMOS WEALTH

CM2596-ADJ Datasheet Preview

CM2596-ADJ Datasheet

3A STEP-DOWN VOLTAGE REGULATOR

No Preview Available !

3A STEP-DOWN VOLTAGE REGULATORS • CM2596-XX SERIES
PIN DESCRIPTION
CM 2596-xx T
CM 2596 T
TO-220-5
tab
CM 2596-xx TV
CM 2596 TV
TO-220-5h
tab 1 3 5
5
1
4
2
IN OUT GND FB ON/OFF GND
1 2 3 4 5 tab
tab 5
1
TO-263-5
CM 2596-xx S
CM 2596 S
IN
OUT
GND
FB
ON/OFF
+VIN - this is the positive input supply for the IC switching
regulator. A suitable input bypass capacitor must be
present at this pin to minimize voltage transients and to
supply the switching currents needed by the regulator.
OUTPUT — internal switch. The voltage at this pin
switches between (+VINVSAT) and approximately -0.5V,
with a duty cycle of approximately VOUT/VIN. To minimize
coupling to sensitive circuitry, the PC board copper area
connected to this pin should be kept to a minimum.
Circuit ground
FEEDBACK — senses the regulated output voltage to
complete the feedback loop.
Allows the switching regulator circuit to be shut down
using logic level signals thus dropping the total input
supply current to approximately 80µA. Pulling this pin
below a threshold voltage of approximately 1.3V turns the
regulator on, and pulling this pin above 1.3V (up to a
maximum of 25V) shuts the regulator down. If this
shutdown feature is not needed, the ON/OFF pin can be
wired to the ground pin or it can be left open, in either
case the regulator will be in the ON condition.
3.3V ! R2 = 4.2k
5.0V ! R2 = 7.6k
12V ! R2 = 21.8k
ADJ ! R1 = Open
R2 = 0
INTERNAL BLOCK DIAGRAM
"5
ON/OFF
#
220mV
#
200mV
##
"IN
#1
CURRENT
SOURCE
BIAS
1.235V
REFERENCE
2.5V
REGULATOR
"FEEDBACK
4
R2
#
R1
2.5k
2.5V
GM
AMP.
#
ACTIVE
CAPACITOR
OP. AMP
#
#
START
UP
# COMP.
CURRENT
LIMIT
#
COMP.
COMP.
LATCH
DRIVER
FREQ. SHIFT
150kHz
OSCILLATOR
RESET
THERMAL
LIMIT
#
3A
SWITCH
#
#
"# 2
OUT
"3
GND
ABSOLUTE MAXIMUM RATINGS (NOTE 1)
PARAMETER
MAXIMUM SUPPLY VOLTAGE
ON/OFF PIN INPUT VOLTAGE
FEEDBACK PIN VOLTAGE
OUTPUT VOLTAGE TO GROUND (steady state)
POWER DISSIPATION
STORAGE TEMPERATURE RANGE
VALUE
45V
-0.3 V +25V
-0.3 V +25V
-1V
Internally limited
-65ºC to +150ºC
ESD SUSCEPTIBILITY
Human Body Model (Note 2)
LEAD TEMPERATURE
TO-220-5
Vapor Phase (60 Sec.)
Infrared (10 Sec.)
TO-263-5 (soldering 10 sec.)
MAXIMUM JUNCTION TEMPERATURE
2 kV
+2150C
+2450C
+2600C
+1500C
Design by Vladimir F.Lityaghin / E-mail: lityaghin@mail.ru / Tel: +7(095)532-64-54
2
OPERATING CONDITIONS
PARAMETER
TEMPERATURE RANGE
SUPPLY VOLTAGE
VALUE
-400C TJ +1250C
4.5V to 40V
NOTES:
1. Absolute Maximum Ratings indicate limits beyond which
damage to the device may occur. Operating Ratings
indicate conditions for which the device is intended to be
functional, but do not guarantee specific performance
limits. For guaranteed specifications and test conditions,
see the Electrical Characteristics.
2. The human body model is a 100 pF capacitor discharged
through a 1.5k resistor into each pin.


Part Number CM2596-ADJ
Description 3A STEP-DOWN VOLTAGE REGULATOR
Maker COSMOS WEALTH
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