LT1076HVIT-5#PBF [Linear]
LT1076-5 - 5V Step-Down Switching Regulator; Package: TO-220; Pins: 5; Temperature Range: -40°C to 85°C;
| 型号： | LT1076HVIT-5#PBF |
| 厂家： | 
Linear |
| 描述： | LT1076-5 - 5V Step-Down Switching Regulator; Package: TO-220; Pins: 5; Temperature Range: -40°C to 85°C 稳压器 开关式稳压器或控制器 电源电路 开关式控制器 局域网 |
| 文件： | 总8页 (文件大小：108K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
LT1076-5
5V Step-Down
Switching Regulator
FEATURES
DESCRIPTION
The LT®1076-5 is a 2A fixed 5V output monolithic bipolar
switchingregulatorwhichrequiresonlyafewexternalparts
for normal operation. The power switch, all oscillator and
controlcircuitry,allcurrentlimitcomponents,andanoutput
monitor 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 con-
verter. The switch output is specified to swing 40V below
ground, allowing the LT1076-5 to drive a tapped inductor
in the buck mode with output currents up to 4A.
n
Fixed 5V Output
n
2A On-Board Switch
n
100kHz Switching Frequency
n
2% Output Voltage Tolerance Over Temperature
n
Greatly Improved Dynamic Behavior
n
Available in Low Cost 5- and 7-Lead Packages
n
Only 9.5mA Quiescent Current
Operates Up to 60V Input
n
APPLICATIONS
n
5V Output Buck Converter
n
Tapped Inductor Buck Converter with 4A Output at
The LT1076-5 uses a true analog multiplier in the feedback
loop.Thismakesthedevicerespondnearlyinstantaneously
to input voltage fluctuations and makes loop gain indepen-
dent of input voltage. As a result, dynamic behavior of the
regulator is significantly improved over previous designs.
5V
n
Positive-to-Negative Converter
On-chippulsebypulsecurrentlimitingmakestheLT1076-
5 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 LT1076-5 is available in a low cost 5- and 7-lead TO-
220packageswithfrequencypre-setat100kHzandcurrent
limit at 2.6A. See Application Note 44 for design details.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
TYPICAL APPLICATION
Basic Positive Buck Converter
100μH**†
5V
V
V
8V TO 40V
IN
SW
≤1.8A
LT1076-5
MBR340*
MBR330P MAY BE USED
*
FOR V ≤ 25V
IN
SENSE
COILTRONICS #100-1-52
HURRICANE #HL-AG210LL
**
V
C
GND
R3
†
VALUE MAY BE REDUCED TO 50μH
FOR OUTPUT LOADS BELOW 1.5A
1.5k
+
+
C1
500μF
25V
C3
200μF
C2
0.033μF
LT1076-5 TA01
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1
LT1076-5
ABSOLUTE MAXIMUM RATINGS
(Note 1)
Input Voltage
Sense Pin Voltage ............................................ –2V, 10V
LT1076-5 .............................................................45V
LT1076HV-5 .........................................................64V
Switch Voltage with Respect to Input Voltage
LT1076-5 ..............................................................64V
LT1076HV-5 .........................................................75V
Switch Voltage with Respect to Ground Pin
Maximum Operating Ambient Temperature Range
LT1076C-5, LT1076HVC-5 ....................... 0°C to 70°C
LT1076I-5, LT1076HVI-5 ..................... –40°C to 85°C
Maximum Operating Junction Temperature Range
LT1076C-5, LT1076HVC-5 ..................... 0°C to 125°C
LT1076I-5, LT1076HVI-5 ................... –40°C to 125°C
Maximum Storage Temperature ............ –65°C to 150°C
Lead Temperature (Soldering, 10 sec) .................. 300°C
(V Negative)
SW
LT1076-5 (Note 6) ................................................35V
LT1076HV-5 (Note 6) ...........................................45V
PACKAGE/ORDER INFORMATION
FRONT VIEW
ORDER PART
NUMBER
ORDER PART
NUMBER
FRONT VIEW
5
4
3
2
1
V
V
IN
7
6
5
4
3
2
1
SHDN
V
C
SW
SENSE
GND
TAB IS
GND
GND
I
LT1076CQ-5
LT1076CR-5
LIM
SW
IN
V
C
V
V
FB/SENSE
R PACKAGE
7-LEAD PLASTIC DD
Q PACKAGE
5-LEAD PLASTIC DD
θ
= 4°C/W, θ = 30°C/W
JC
JA
θ
JC
= 4°C/W, θ = 30°C/W
JA
FRONT VIEW
ORDER PART
NUMBER
ORDER PART
NUMBER
FRONT VIEW
5
4
3
2
1
V
IN
SHDN
V
7
6
5
4
3
2
1
V
V
TAB
IS
GND
SW
C
GND
TAB
IS
GND
SENSE
GND
C
LT1076CT-5
LT1076HVCT-5
LT1076IT-5
LT1076CT7-5
I
LIM
SENSE
V
SW
V
IN
T PACKAGE
5-LEAD PLASTIC TO-220
T7 PACKAGE
7-LEAD PLASTIC TO-220
LEADS ARE FORMED STANDARD
FOR STRAIGHT LEADS, ORDER FLOW 06
θ
= 4°C/W, θ = 50°C/W
JC JA
LT1076HVIT-5
θ
JC
= 4°C/W, θ = 50°C/W
JA
Order Options Tape and Reel: Add #TR
Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking: http://www.linear.com/leadfree/
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TJ = 25°C. VIN = 25V, unless otherwise noted.
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
l
l
Switch “On” Voltage (Note 2)
I
SW
I
SW
= 0.5A
= 2A
1.2
1.7
V
V
Switch “Off” Leakage
V
IN
V
IN
= 25V, VSW = 0
= 25V, VSW = 0
150
250
μA
μA
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2
LT1076-5
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TJ = 25°C. VIN = 25V, unless otherwise noted.
SYMBOL
CONDITIONS
= 5.5V, V ≤ 40V
MIN
TYP
MAX
UNITS
l
l
Supply Current (Note 3)
V
8.5
9.0
140
11
12
300
mA
mA
μA
OUT
IN
40V < V < 60V
IN
V
= 0.1V (Device Shutdown) (Note 9)
SHDN
l
l
Minimum Supply Voltage
Normal Mode
Start-Up Mode (Note 4)
7.3
3.5
8.0
4.8
V
V
l
Switch Current Limit (Note 5)
I
= Open
LIM
LIM
2
2.6
1.8
1.2
3.2
A
A
A
LIM
R
R
= 10k (Note 10)
= 7k (Note 10)
l
l
l
Maximum Duty Cycle
Switching Frequency
85
90
%
90
85
100
110
120
kHz
kHz
kHz
T ≤ 125°C
J
V
= V
= 0V (Note 5)
20
OUT
SENSE
Switching Frequency Line Regulation 8V ≤ V ≤ V
(Note 8)
= 4.5V)
0.03
2000
5000
0.1
%/V
V/V
IN
MAX
Error Amplifier Voltage Gain (Note 8) 1V ≤ V ≤ 4V
C
Error Amplifier Transconductance
(Note 8)
3700
8000
μmho
Error Amplifier Source and Sink
Current
Source (V
100
0.7
140
1.0
225
1.6
μA
mA
SENSE
Sink (V
= 5.5V)
SENSE
Sense Pin Divider Resistance
Sense Voltage
3
5
5
8
kΩ
V
l
l
l
l
V = 2V
4.85
5.15
C
Output Voltage Tolerance
V
OUT
(Nominal) = 5V
0.5
1.0
2
3
%
%
All Conditions of Input Voltage, Output Voltage,
Temperature and Load Current
Output Voltage Line Regulation
VC Voltage at 0% Duty Cycle
8V ≤ V ≤ V
(Note 7)
0.005
0.02
%/V
IN
MAX
1.5
–4.0
V
Over Temperature
mV/°C
Multiplier Reference Voltage
Shutdown Pin Current
24
10
V
V
V
= 5V
5
20
50
μA
μA
SHDN
SHDN
≤ V
(≅ 2.5V)
THRESHOLD
Shutdown Thresholds
Switch Duty Cycle = 0
Fully Shut Down
2.2
0.1
2.45
0.30
2.7
0.5
V
V
Thermal Resistance Junction to Case
4
°C/W
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: To calculate maximum switch “on” voltage at currents between
low and high conditions, a linear interpolation may be used.
current limit testing, V
of 1ms.
is adjusted to give a minimum switch on time
SENSE
Note 6: Switch to input voltage limitation must also be observed.
Note 7: V = 40V for the LT1076-5 and 60V for the LT1076HV-5.
MAX
Note 8: Error amplifier voltage gain and transconductance are
specified relative to the internal feedback node. To calculate gain and
transconductance from the Sense pin (Output) to the V pin, multiply by
0.44.
Note 3: A sense pin voltage (V ) of 5.5V forces the VC pin to its low
SENSE
C
clamp level and the switch duty cycle to zero. This approximates the zero
load condition where duty cycle approaches zero.
Note 9: Does not include switch leakage.
Note 4: Total voltage from V pin to ground pin must be ≥ 8V after start-
IN
RLIM −1k
ILIM
≈
up for proper regulation. For T < 25°C, limit = 5V.
A
5k
Note 10:
Note 5: Switch frequency is internally scaled down when the sense pin
voltage is less than 2.6V to avoid extremely short switch on times. During
10765fc
3
LT1076-5
PACKAGE DESCRIPTION
Q Package
5-Lead Plastic DD Pak
(Reference LTC DWG # 05-08-1461)
.060
(1.524)
TYP
.390 – .415
(9.906 – 10.541)
.060
(1.524)
.165 – .180
(4.191 – 4.572)
.256
(6.502)
.045 – .055
(1.143 – 1.397)
15° TYP
+.008
.004
–.004
.060
(1.524)
.059
(1.499)
TYP
.183
(4.648)
.330 – .370
(8.382 – 9.398)
+0.203
–0.102
0.102
(
)
.095 – .115
(2.413 – 2.921)
.075
(1.905)
.067
(1.702)
BSC
.050 .012
(1.270 0.305)
.300
(7.620)
.013 – .023
(0.330 – 0.584)
+.012
.143
–.020
.028 – .038
+0.305
BOTTOM VIEW OF DD PAK
HATCHED AREA IS SOLDER PLATED
COPPER HEAT SINK
3.632
Q(DD5) 0502
(0.711 – 0.965)
(
)
–0.508
TYP
.420
.276
.080
.420
.350
.325
.205
.565
.565
.320
.090
.042
.090
.042
.067
.067
RECOMMENDED SOLDER PAD LAYOUT
NOTE:
RECOMMENDED SOLDER PAD LAYOUT
FOR THICKER SOLDER PASTE APPLICATIONS
1. DIMENSIONS IN INCH/(MILLIMETER)
2. DRAWING NOT TO SCALE
10765fc
4
LT1076-5
R Package
7-Lead Plastic DD Pak
(Reference LTC DWG # 05-08-1462)
.060
(1.524)
TYP
.390 – .415
(9.906 – 10.541)
.060
(1.524)
.256
(6.502)
.165 – .180
(4.191 – 4.572)
.045 – .055
(1.143 – 1.397)
15° TYP
.060
(1.524)
+.008
.004
.183
(4.648)
–.004
.059
(1.499)
TYP
.330 – .370
(8.382 – 9.398)
+0.203
–0.102
0.102
(
)
.095 – .115
(2.413 – 2.921)
.075
(1.905)
.300
(7.620)
.050
(1.27)
BSC
.050 .012
.013 – .023
(0.330 – 0.584)
+.012
.143
(1.270 0.305)
–.020
R (DD7) 0502
.026 – .035
BOTTOM VIEW OF DD PAK
HATCHED AREA IS SOLDER PLATED
COPPER HEAT SINK
+0.305
(0.660 – 0.889)
3.632
(
)
–0.508
TYP
.420
.276
.080
.420
.350
.325
.205
.320
.565
.565
.090
.035
.090
.035
.050
.050
RECOMMENDED SOLDER PAD LAYOUT
RECOMMENDED SOLDER PAD LAYOUT
NOTE:
FOR THICKER SOLDER PASTE APPLICATIONS
1. DIMENSIONS IN INCH/(MILLIMETER)
2. DRAWING NOT TO SCALE
10765fc
5
LT1076-5
PACKAGE DESCRIPTION
T Package
5-Lead Plastic TO-220 (Standard)
(Reference LTC DWG # 05-08-1421)
.165 – .180
(4.191 – 4.572)
.147 – .155
(3.734 – 3.937)
DIA
.390 – .415
(9.906 – 10.541)
.045 – .055
(1.143 – 1.397)
.230 – .270
(5.842 – 6.858)
.570 – .620
(14.478 – 15.748)
.620
(15.75)
TYP
.460 – .500
(11.684 – 12.700)
.330 – .370
(8.382 – 9.398)
.700 – .728
(17.78 – 18.491)
.095 – .115
(2.413 – 2.921)
SEATING PLANE
.152 – .202
(3.861 – 5.131)
.155 – .195*
(3.937 – 4.953)
.260 – .320
(6.60 – 8.13)
.013 – .023
(0.330 – 0.584)
.067
BSC
.135 – .165
(3.429 – 4.191)
.028 – .038
(0.711 – 0.965)
(1.70)
* MEASURED AT THE SEATING PLANE
T5 (TO-220) 0801
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6
LT1076-5
PACKAGE DESCRIPTION
T7 Package
7-Lead Plastic TO-220 (Standard)
(Reference LTC DWG # 05-08-1422)
.165 – .180
(4.191 – 4.572)
.147 – .155
(3.734 – 3.937)
DIA
.390 – .415
(9.906 – 10.541)
.045 – .055
(1.143 – 1.397)
.230 – .270
(5.842 – 6.858)
.570 – .620
(14.478 – 15.748)
.620
(15.75)
TYP
.460 – .500
(11.684 – 12.700)
.330 – .370
(8.382 – 9.398)
.700 – .728
(17.780 – 18.491)
.095 – .115
(2.413 – 2.921)
.155 – .195*
(3.937 – 4.953)
SEATING PLANE
.152 – .202
(3.860 – 5.130)
.260 – .320
(6.604 – 8.128)
.013 – .023
(0.330 – 0.584)
.050
BSC
.026 – .036
(0.660 – 0.914)
(1.27)
.135 – .165
(3.429 – 4.191)
*MEASURED AT THE SEATING PLANE
T7 (TO-220) 0801
10765fc
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa-
tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.
7
LT1076-5
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10765fc
LT 0407 REV C • PRINTED IN USA
LinearTechnology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
8
●
●
© LINEAR TECHNOLOGY CORPORATION 1994
(408) 432-1900 FAX: (408) 434-0507 www.linear.com
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