Sense Pin Voltage ............................................ –2V, 10V
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
PACKAGE/ORDER INFORMATION
FRONT VIEW
5
4
3
2
1
Q PACKAGE
5-LEAD PLASTIC DD
V
IN
V
SW
GND
V
C
FB/SENSE
TAB IS
GND
FRONT VIEW
7
6
5
4
3
2
1
R PACKAGE
7-LEAD PLASTIC DD
SHDN
V
C
SENSE
GND
I
LIM
V
SW
V
IN
ORDER PART
NUMBER
LT1076CQ-5
ORDER PART
NUMBER
LT1076CR-5
θ
JC
= 4°C/W,
θ
JA
= 30°C/W
FRONT VIEW
5
4
3
2
1
T PACKAGE
5-LEAD PLASTIC TO-220
V
IN
V
SW
GND
V
C
SENSE
TAB
IS
GND
θ
JC
= 4°C/W,
θ
JA
= 30°C/W
FRONT VIEW
7
6
5
4
3
2
1
T7 PACKAGE
7-LEAD PLASTIC TO-220
SHDN
V
C
SENSE
GND
I
LIM
V
SW
V
IN
TAB
IS
GND
ORDER PART
NUMBER
LT1076CT-5
LT1076HVCT-5
LT1076IT-5
LT1076HVIT-5
ORDER PART
NUMBER
LT1076CT7-5
LEADS ARE FORMED STANDARD
FOR STRAIGHT LEADS, ORDER FLOW 06
θ
JC
= 4°C/W,
θ
JA
= 50°C/W
θ
JC
= 4°C/W,
θ
JA
= 50°C/W
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
SYMBOL
Switch “On” Voltage (Note 2)
Switch “Off” Leakage
CONDITIONS
I
SW
= 0.5A
I
SW
= 2A
V
IN
= 25V, VSW = 0
V
IN
= 25V, VSW = 0
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
J
= 25°C. V
IN
= 25V, unless otherwise noted.
MIN
l
l
TYP
MAX
1.2
1.7
150
250
UNITS
V
V
μA
μA
10765fc
2
LT1076-5
ELECTRICAL CHARACTERISTICS
SYMBOL
Supply Current (Note 3)
CONDITIONS
V
OUT
= 5.5V, V
IN
≤ 40V
40V < V
IN
< 60V
V
SHDN
= 0.1V (Device Shutdown) (Note 9)
Normal Mode
Start-Up Mode (Note 4)
I
LIM
= Open
R
LIM
= 10k (Note 10)
R
LIM
= 7k (Note 10)
l
l
l
l
l
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
J
= 25°C. V
IN
= 25V, unless otherwise noted.
MIN
TYP
8.5
9.0
140
7.3
3.5
2
2.6
1.8
1.2
90
100
20
l
MAX
11
12
300
8.0
4.8
3.2
UNITS
mA
mA
μA
V
V
A
A
A
%
kHz
kHz
kHz
%/V
V/V
μmho
μA
mA
kΩ
V
%
%
%/V
V
mV/°C
V
Minimum Supply Voltage
Switch Current Limit (Note 5)
Maximum Duty Cycle
Switching Frequency
T
J
≤ 125°C
V
OUT
= V
SENSE
= 0V (Note 5)
Switching Frequency Line Regulation 8V ≤ V
IN
≤ V
MAX
(Note 8)
Error Amplifier Voltage Gain (Note 8) 1V ≤ V
C
≤ 4V
Error Amplifier Transconductance
(Note 8)
Error Amplifier Source and Sink
Current
Sense Pin Divider Resistance
Sense Voltage
Output Voltage Tolerance
V
C
= 2V
V
OUT
(Nominal) = 5V
All Conditions of Input Voltage, Output Voltage,
Temperature and Load Current
8V ≤ V
IN
≤ V
MAX
(Note 7)
Over Temperature
Multiplier Reference Voltage
Shutdown Pin Current
Shutdown Thresholds
Thermal Resistance Junction to Case
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.
Note 3:
A sense pin voltage (V
SENSE
) of 5.5V forces the VC pin to its low
clamp level and the switch duty cycle to zero. This approximates the zero
load condition where duty cycle approaches zero.
Note 4:
Total voltage from V
IN
pin to ground pin must be ≥ 8V after start-
up for proper regulation. For T
A
< 25°C, limit = 5V.
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
V
SHDN
= 5V
V
SHDN
≤ V
THRESHOLD
(≅ 2.5V)
Switch Duty Cycle = 0
Fully Shut Down
Source (V
SENSE
= 4.5V)
Sink (V
SENSE
= 5.5V)
l
l
85
90
85
110
120
0.1
8000
225
1.6
8
5.15
±2
±3
0.02
0.03
2000
3700
100
0.7
3
5000
140
1.0
5
5
±0.5
±1.0
0.005
1.5
–4.0
24
5
2.2
0.1
10
2.45
0.30
l
l
l
l
4.85
Output Voltage Line Regulation
VC Voltage at 0% Duty Cycle
20
50
2.7
0.5
4
μA
μA
V
V
°C/W
current limit testing, V
SENSE
is adjusted to give a minimum switch on time
of 1ms.
Note 6:
Switch to input voltage limitation must also be observed.
Note 7:
V
MAX
= 40V for the LT1076-5 and 60V for the LT1076HV-5.
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
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Microcontroller MCU
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