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參數(shù)資料
| 型號： | LT1176CS#TR |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 2.2 A SWITCHING REGULATOR, 120 kHz SWITCHING FREQ-MAX, PDSO20 |
| 封裝： | PLASTIC, SOL-20 |
| 文件頁數(shù)： | 3/4頁 |
| 文件大小： | 166K |
| 代理商： | LT1176CS#TR |
3
LT1176/LT1176-5
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Feedback Pin Bias Current (LT1176)
VFB = VREF
q
0.5
2
A
Reference Voltage (LT1176)
VC = 2V
q
2.155
2.21
2.265
V
Reference Voltage Tolerance (LT1176)
VREF (Nominal) = 2.21V
±0.5
±1.5
%
All Conditions of Input Voltage, Output
q
±1.0
±2.5
%
Voltage, Temperature and Load Current
Sense Voltage (LT1176-5)
VC = 2V
q
4.85
5
5.15
V
Sense Voltage Tolerance (LT1176-5)
VOUT (Nominal) = 5V
±0.5
±2%
All Conditions of Input Voltage,
q
±1.0
±3%
Temperature and Load Current
Sense Pin Divider Resistance (LT1176-5)
3
5
8
k
Output Voltage Line Regulation
8V
≤ VIN ≤ VMAX (Note 7)
q
0.005
0.02
%/ V
VC Voltage at 0% Duty Cycle
1.5
V
Over Temperature
q
– 4.0
mV/
°C
Multiplier Reference Voltage
24
V
Shutdown Pin Current
VSHDN = 5Vq
510
20
A
VSHDN ≤ VTHRESHOLD ( 2.5V)
q
50
A
Shutdown Thresholds
Switch Duty Cycle = 0
q
2.2
2.45
2.7
V
Fully Shut Down
q
0.1
0.30
0.5
V
Status Window
As a Percent of Output Voltage
±4
±5
±6%
Status High Level
ISTATUS = 10A Sourcing
q
3.5
4.5
5.0
V
Status Low Level
ISTATUS = 1.6mA Sinking
q
0.25
0.4
V
Status Delay Time
9
s
Status Minimum Width
30
s
ELECTRICAL C
C
HARA TERISTICS T
J = 25°C, VIN = 25V, unless otherwise noted
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 represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
The q denotes specifications which apply over the full operating tempera-
ture range.
Note 1: To calculate maximum switch “ON” voltage at current between low
and high conditions, a linear interpolation may be used.
Note 2: A feedback pin voltage (VFB) of 2.5V 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. The LT1176-5 has
VSENSE = 5.5V.
Note 3: Total voltage from VIN pin to ground pin must be ≥8V after start-
up for proper regulation.
Note 4: 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, VFB or VSENSE is adjusted to give a minimum switch-on time of 1s.
Note 5: ILM = (RLIM – 1k)/7.65k
Note 6: Switch to input voltage limitation must also be observed.
Note 7: VMAX = 35V
Note 8: Does not include switch leakage.
Note 9: Error amplifier voltage gain and transconductance are specified
relative to the internal feedback node. To calculate gain and transconduc-
tance from the sense pin (Output) to the VC pin on the LT1176-5, multiply
by 0.44.
Power = ILOAD (VOUT/VIN) + VIN [7mA + 3mA (VOUT/VIN) + 0.012 (ILOAD)]
IPEAK = ILOAD(PEAK) + [VOUT (VIN – VOUT)]/2E
5(VIN)(L)
Example: VIN = 15V, VOUT = 5V, ILOAD = 0.5A Continuous, 0.8A Peak,
L = 100
H
Power (ILOAD = 0.5A) = 0.38W
IPEAK (ILOAD = 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.
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 heatsink 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.
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