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参数资料
| 型号： | LT1176CSW#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 4/8页 |
| 文件大小： | 0K |
| 描述： | IC REG MULTI CONFIG ADJ 20SOIC |
| 标准包装： | 1,000 |
| 类型： | 降压（降压），反相，回扫 |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 2.2 V ~ 29.8 V |
| 输入电压： | 8 V ~ 35 V |
| 频率 - 开关： | 100kHz |
| 电流 - 输出： | 1A |
| 同步整流器： | 无 |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-SOIC（0.295"，7.50mm 宽） |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 20-SOIC |
LT1176/LT1176-5
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications ar e at T A = 25°C. T J = 25°C, V IN 25V, unless otherwise noted.
PARAMETER
Status Low Level
CONDITIONS
I STATUS = 1.6mA Sinking
l
MIN
TYP
0.25
MAX
0.4
UNITS
V
Status Delay Time
Status Minimum Width
9
30
μs
μs
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 FB ) of 2.5V forces the V C pin to its low
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 SENSE = 5.5V.
Note 4: Total voltage from V IN pin to ground pin must be ≥ 8V after
start-up for proper regulation.
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.
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 FB or V SENSE is adjusted to give a minimum switch-on time of
1μs.
Note 6: I LM = (R LIM – 1k)/7.65k
Note 7: Switch to input voltage limitation must also be observed.
Note 8: V MAX = 35V
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 C pin on the
LT1176-5, multiply by 0.44.
Power = I LOAD (V OUT /V IN ) + V IN [7mA + 3mA (V OUT /V IN ) + 0.012 (I LOAD )]
I PEAK = I LOAD(PEAK) + [V OUT (V IN – V OUT )]/2E 5 (V IN )(L)
Example: V IN = 15V, V OUT = 5V, I LOAD = 0.5A Continuous, 0.8A Peak,
L = 100μH
Power (I LOAD = 0.5A) = 0.38W
I PEAK (I LOAD = 0.8A) = 0.97A
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 ? computer
design program, and our knowledgeable application department.
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4
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