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LT1074MK

Description
5.5 A SWITCHING REGULATOR, 100 kHz SWITCHING FREQ-MAX, MBFM4
CategoryPower/power management    The power supply circuit   
File Size221KB,16 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
Download Datasheet Parametric View All

LT1074MK Overview

5.5 A SWITCHING REGULATOR, 100 kHz SWITCHING FREQ-MAX, MBFM4

LT1074MK Parametric

Parameter NameAttribute value
Is it Rohs certified?incompatible
MakerLinear ( ADI )
Parts packaging codeTO-204AA
package instructionMETAL CAN, TO-3, 4 PIN
Contacts2
Reach Compliance Codeunknow
ECCN codeEAR99
Other featuresALSO OPERATES IN ADJUSTABLE MODE FROM 2.5V TO 50V
Analog Integrated Circuits - Other TypesSWITCHING REGULATOR
control modeCURRENT-MODE
Control TechnologyPULSE WIDTH MODULATION
Maximum input voltage60 V
Minimum input voltage8 V
Nominal input voltage25 V
JESD-30 codeO-MBFM-P4
JESD-609 codee0
Number of functions1
Number of terminals4
Maximum operating temperature125 °C
Minimum operating temperature-55 °C
Maximum output current8.5 A
Nominal output voltage2.21 V
Package body materialMETAL
encapsulated codeTO-3
Encapsulate equivalent codeCAN4/5,.45FL
Package shapeROUND
Package formFLANGE MOUNT
Peak Reflow Temperature (Celsius)NOT SPECIFIED
Certification statusNot Qualified
Maximum supply current (Isup)11 mA
surface mountNO
Switch configurationBUCK
Maximum switching frequency125 kHz
technologyBIPOLAR
Temperature levelMILITARY
Terminal surfaceTin/Lead (Sn/Pb)
Terminal formPIN/PEG
Terminal locationBOTTOM
Maximum time at peak reflow temperatureNOT SPECIFIED
LT1074/LT1076
Step-Down Switching
Regulator
FEATURES
s
s
s
s
s
s
s
s
5A Onboard Switch (LT1074)
100kHz Switching Frequency
Greatly Improved Dynamic Behavior
Available in Low Cost 5 and 7-Lead Packages
Only 8.5mA Quiescent Current
Programmable Current Limit
Operates Up to 60V Input
Micropower Shutdown Mode
positive “buck” configuration but several design innova-
tions allow this device to be used as a positive-to-negative
converter, a negative boost converter, and as a flyback
converter. The switch output is specified to swing 40V
below ground, allowing the LT1074 to drive a tapped-
inductor in the buck mode with output currents up to 10A.
The LT1074 uses a true analog multiplier in the feedback
loop. This makes the device respond nearly instanta-
neously to input voltage fluctuations and makes loop gain
independent of input voltage. As a result, dynamic behav-
ior of the regulator is significantly improved over previous
designs.
On-chip pulse by pulse current limiting makes the LT1074
nearly bust-proof for output overloads or shorts. The input
voltage range as a buck converter is 8V to 60V, but a self-
boot feature allows input voltages as low as 5V in the
inverting and boost configurations.
The LT1074 is available in low cost TO-220 or TO-3
packages with frequency pre-set at 100kHz and current
limit at 6.5A (LT1076 = 2.6A). A 7-pin TO-220 package is
also available which allows current limit to be adjusted
down to zero. In addition, full micropower shutdown can
be programmed. See Application Note 44 for design
details.
A fixed 5V output, 2A version is also available. See LT1076-5.
, LTC and LT are registered trademarks of Linear Technology Corporation.
APPLICATIO S
s
s
s
s
s
Buck Converter with Output Voltage Range of 2.5V
to 50V
Tapped-Inductor Buck Converter with 10A Output
at 5V
Positive-to-Negative Converter
Negative Boost Converter
Multiple Output Buck Converter
DESCRIPTIO
The LT
®
1074 is a 5A (LT1076 is rated at 2A) monolithic
bipolar switching regulator which requires only a few
external parts for normal operation. The power switch, all
oscillator and control circuitry, and all current limit com-
ponents, are included on the chip. The topology is a classic
TYPICAL APPLICATIO
Basic Positive Buck Converter
L1**
50
µ
H (LT1074)
100
µ
H (LT1076)
10V TO 40V
V
IN
LT1074
FB
R3
2.7k
C3
200
µ
F
C2
0.01
µ
F
V
SW
MBR745*
R1
2.8k
1%
R2
2.21k
1%
+
LT1074
100
EFFICIENCY (%)
GND
V
C
+
U
U
U
Buck Converter Efficiency
5V
5A
C1
500
µ
F
25V
* USE MBR340 FOR LT1076
** COILTRONICS #50-2-52 (LT1074)
#100-1-52 (LT1076)
PULSE ENGINEERING, INC.
#PE-92114 (LT1074)
#PE-92102 (LT1076)
HURRICANE #HL-AK147QQ (LT1074)
#HL-AG210LL (LT1076)
RIPPLE CURRENT RATING
I
OUT
/2
90
80
V
OUT
= 12V, V
IN
= 20V
V
OUT
= 5V, V
IN
= 15V
70
60
50
0
1
2
3
4
5
6
L = 50µH TYPE 52 CORE
DIODE = MBR735
LT1074•TA01
OUTPUT LOAD CURRENT (A)
LT1074•TPC27
1
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