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LT1074CT#PBF

Description
IC REG MULT CONFIG INV ADJ TO220
CategoryPower/power management    The power supply circuit   
File Size178KB,16 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
Environmental Compliance
Download Datasheet Parametric View All

LT1074CT#PBF Overview

IC REG MULT CONFIG INV ADJ TO220

LT1074CT#PBF Parametric

Parameter NameAttribute value
Brand NameLinear Technology
Is it Rohs certified?conform to
MakerLinear ( ADI )
Parts packaging codeTO-220
package instructionLEAD FREE, PLASTIC, TO-220, 5 PIN
Contacts5
Manufacturer packaging codeT
Reach Compliance Codenot_compliant
ECCN codeEAR99
Samacsys DescriptionLT1074CT#PBF, Switching Regulator, Buck Controller, 10A, Adjustable, 2.5 → 50 V, 110 kHz, 5-Pin TO-220
Other featuresALSO OPERATES WITH ADJUSTABLE MODE FROM 2.5 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 codeR-PZFM-T5
JESD-609 codee3
Number of functions1
Number of terminals5
Maximum operating temperature70 °C
Minimum operating temperature
Maximum output current8.5 A
Nominal output voltage2.21 V
Package body materialPLASTIC/EPOXY
encapsulated codeTO-220
Encapsulate equivalent codeZIP5,.15,.2,67TB
Package shapeRECTANGULAR
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 levelCOMMERCIAL
Terminal surfaceMatte Tin (Sn) - with Nickel (Ni) barrier
Terminal formTHROUGH-HOLE
Terminal pitch1.7 mm
Terminal locationZIG-ZAG
Maximum time at peak reflow temperatureNOT SPECIFIED
LT1074/LT1076
Step-Down Switching
Regulator
FEATURES
5A Onboard Switch (LT1074)
Operates Up to 60V Input
100kHz Switching Frequency
Greatly Improved Dynamic Behavior
Available in Low Cost 5 and 7-Lead Packages
Only 8.5mA Quiescent Current
Programmable Current Limit
Micropower Shutdown Mode
ponents, are included on the chip. The topology is a classic
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 DD 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
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-
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%
+
100
EFFICIENCY (%)
GND
V
C
+
U
U
U
Buck Converter Efficiency
LT1074
5V
5A
90
80
V
OUT
= 12V, V
IN
= 20V
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
V
OUT
= 5V, V
IN
= 15V
70
60
50
0
1
2
3
4
5
6
OUTPUT LOAD CURRENT (A)
L = 50µH TYPE 52 CORE
DIODE = MBR735
LT1074•TA01
LT1074•TPC27
sn1074 1074fds
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