LT1176CN8 Linear Technology, LT1176CN8 Datasheet - Page 4

IC MULTI CONFIG ADJ 1A 8DIP

LT1176CN8

Manufacturer Part Number
LT1176CN8
Description
IC MULTI CONFIG ADJ 1A 8DIP
Manufacturer
Linear Technology
Type
Step-Down (Buck), Inverting, Flybackr
Datasheet

Specifications of LT1176CN8

Internal Switch(s)
Yes
Synchronous Rectifier
No
Number Of Outputs
1
Voltage - Output
2.2 ~ 29.8 V
Current - Output
1A
Frequency - Switching
100kHz
Voltage - Input
8 ~ 35 V
Operating Temperature
0°C ~ 70°C
Mounting Type
Through Hole
Package / Case
8-DIP (0.300", 7.62mm)
Power - Output
1W
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant

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ELECTRICAL CHARACTERISTICS
LT1176/LT1176-5
PARAMETER
Status Low Level
Status Delay Time
Status Minimum Width
Application Hints
Although the LT1176 has a peak switch rating of 1.2A and a maximum duty
cycle of 85%, it must be used cautiously in applications which require high
switch current and high duty cycle simultaneously, to avoid excessive chip
temperature. Thermal resistance is 90°C/W for the 8-pin DIP package and
50°C/W for the 20-pin SO. This limits continuous chip power dissipation to
the 0.5W to 1W range. These numbers assume typical mounting techniques.
Extra or thick copper connected to the leads can reduce thermal resistance.
Bonding the package to the board or using a clip style heat sink can also help.
The following formulas will give chip power dissipation and peak switch current
for the standard buck converter. Note that surges less than 30 seconds do not
need to be considered from a thermal standpoint, but for proper regulation,
they must not result in peak switch currents exceeding the 1.2A limit.
temperature range, otherwise specifications are at T
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 current between low
and high conditions, a linear interpolation may be used.
Note 3: A feedback pin voltage (V
clamp level and the switch duty cycle to zero. This approximates the
zero load condition where duty cycle approaches zero. The LT1176-5 has
V
Note 4: Total voltage from V
start-up for proper regulation.
4
SENSE
= 5.5V.
IN
pin to ground pin must be ≥ 8V after
FB
) of 2.5V forces the V
CONDITIONS
I
STATUS
C
pin to its low
A
= 25°C. T
= 1.6mA Sinking
The
l
J
= 25°C, V
denotes the specifications which apply over the full operating
Power = I
I
Example: V
Power (I
I
Where component size or height is critical, we suggest using solid tantalum
capacitors (singly or in parallel), but be sure to use units rated for switching
applications. Coiltronics is a good source for low profile surface mount
inductors and AVX makes high quality surface mount tantalum capacitors. For
further help, use Application Notes 19 and 44,LTC’s SwitcherCAD
design program, and our knowledgeable application department.
Note 5: Switch frequency is internally scaled down when the feedback pin
voltage is less than 1.3V to avoid extremely short switch-on times. During
testing, V
1µs.
Note 6: I
Note 7: Switch to input voltage limitation must also be observed.
Note 8: V
Note 9: Does not include switch leakage.
Note 10: 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
LT1176-5, multiply by 0.44.
PEAK
PEAK
IN
= I
(I
LOAD
LOAD(PEAK)
25V, unless otherwise noted.
LOAD
LM
FB
MAX
LOAD
L = 100µH
IN
= (R
or V
= 0.8A) = 0.97A
= 15V, V
= 0.5A) = 0.38W
= 35V
(V
SENSE
LIM
OUT
+ [V
/V
– 1k)/7.65k
OUT
IN
is adjusted to give a minimum switch-on time of
OUT
) + V
= 5V, I
(V
IN
IN
l
[7mA + 3mA (V
– V
LOAD
OUT
MIN
= 0.5A Continuous, 0.8A Peak,
)]/2E
5
(V
OUT
IN
0.25
TYP
30
)(L)
9
/V
IN
) + 0.012 (I
C
pin on the
MAX
0.4
®
computer
LOAD
11765fb
UNITS
)]
µs
µs
V

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