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LT1076HVIR Datasheet

  • LT1076HVIR

  • Step-Down Switching Regulator

  • 16頁

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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 鈥渂uck鈥?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
廬
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
碌
H (LT1074)
100
碌
H (LT1076)
10V TO 40V
V
IN
LT1074
FB
R3
2.7k
C3
200
碌
F
鈥?/div>
MBR745*
R1
2.8k
1%
R2
2.21k
1%
+
GND
V
C
+
C2
0.01
碌
F
C1
500
碌
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)
鈥?/div>
RIPPLE CURRENT RATING
鈮?/div>
I
OUT
/2
EFFICIENCY (%)
V
SW
U
U
U
Buck Converter Efficiency
LT1074
100
5V
5A
90
80
V
OUT
= 5V, V
IN
= 15V
70
60
50
0
LT1074鈥A01
V
OUT
= 12V, V
IN
= 20V
L = 50碌H TYPE 52 CORE
DIODE = MBR735
1
2
3
4
5
6
OUTPUT LOAD CURRENT (A)
LT1074鈥PC27
1

LT1076HVIR 產(chǎn)品屬性

  • LT1074/76

  • 50

  • 集成電路 (IC)

  • PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器

  • -

  • 降壓（降壓），升壓（升壓），反相，回掃

  • 可調(diào)式

  • 1

  • 2.5 V ~ 50 V

  • 8 V ~ 64 V

  • -

  • 100kHz

  • 2A

  • 無

  • -40°C ~ 85°C

  • 表面貼裝

  • TO-263-8，D²Pak（7 引線+接片），TO-263CA

  • 管件

  • D2PAK-7

LT1076HVIR相關(guān)型號(hào)PDF文件下載

  • 型號(hào)
    版本
    描述
    廠商
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  • 英文版
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