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| 型号： | LT1268CQ |
| 厂商： | Linear Technology |
| 文件页数： | 3/4页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK INV FLYBK ADJ D2PAK |
| 标准包装： | 50 |
| 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： | 1.24 V ~ 60 V |
| 输入电压： | 3.5 V ~ 30 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 150kHz |
| 电流 - 输出： | 7.5A |
| 同步整流器： | 无 |
| 工作温度： | 0°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | TO-263-6，D²Pak（5 引线+接片），TO-263BA |
| 包装： | 管件 |
| 供应商设备封装： | D2PAK-5 |
LT1268B/LT1268
ELECTRICAL C HARA C TERISTICS
V IN = 15V, V C = 0.5V, V FB = V REF , switch pin open, unless otherwise noted.
SYMBOL
? I IN
? I SW
f
PARAMETER
Supply Current Increase
During Switch-ON Time
Switching Frequency
CONDITIONS
MIN
120
TYP
25
150
MAX
45
180
UNITS
mA/A
kHz
q
120
180
kHz
DC MAX
Maximum Switch Duty Cycle
Shutdown Mode Supply Current
3V ≤ V IN ≤ V MAX , V C = 0.05V
65
85
100
92
500
%
μ A
Shutdown Mode Threshold Voltage
3V ≤ V IN ≤ V MAX
q
100
50
150
250
300
mV
mV
I MAX =
The q denotes specifications which apply over the full operating
temperature range.
Note 1: Measured with V C in hi clamp, V FB = 0.8V.
Note 2: For duty cycles (DC) between 50% and 65%, minimum guaranteed
switch current is given by I LIM = 6.25 (1.7 – DC).
Note 3: Minimum current limit is reduced by 0.5A at 125 ° C. 100 ° C test
limits are guaranteed by correlation to 125 ° C tests.
Note 4: LT1268B reference voltage is specified at ± 9mV to guarantee ± 1%
output voltage accuracy when 0.1% external resistors are used to set
output voltage. To maintain output accuracy under load, load current
should be taken from the case and the ground pin should be connected
separately to output ground. See AN19 for details.
has a thermal resistance of 20 ° C/W to 50 ° C/W (see graph). The following
formula will allow an estimate of maximum continuous switch current as a
function of power loss and duty cycle. See AN19 for more details.
P
R SW × DC
P = Power dissipation due to switch current
R SW = Switch-ON resistance ≈ 0.15 ?
DC = Switch duty cycle
In a typical application where thermal resistance is 30 ° C/W, maximum
power might be limited to 2W and power allocated to switch loss is 1.5W.
For a duty cycle of 40%, this yields
Note 5: The Q package is intended for surface mount without a separate
heat sink. See graph for thermal resistance as a function of the mounting
area. This curve assumes no other heat dissipators adjacent to package.
I MAX =
1.5
0.15 × 0.4
= 5A
Note 6: Maximum switch current may be limited by package power
dissipation, especially for the surface mount (Q) package. This package
Obviously, a combination of high thermal resistance and high duty cycle
may restrict switch current to a value well below the 7.5A electrical limit.
TYPICAL PERFOR A CE CHARACTERISTICS
24
Switch Current Limit vs Duty Cycle
1.6
Switch Saturation Voltage
60
Q Package Thermal Resistance
1.4
T J = 25°C
50
18
1.2
1.0
40
SINGLE-SIDED BOARD, 1oz COPPER
12
–55°C
0.8
30
6
25°C
125°C
0.6
0.4
0.2
20
10
DOUBLE-SIDED BOARD, 1oz COPPER
BOTTOM COPPER AREA >100cm 2
0
0
10 20
30 40 50 60 70 80 90 100
0
0
1
2
3
4
5
6
7
8
9
10
0
0
5
10 15 20
25
30
DUTY CYCLE (%)
LT1268 ? TPC01
SWITCH CURRENT (A)
LT1268 ? TPC02
TOP SURFACE COPPER AREA (cm 2 )
LT1268 ? 603
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 representation that
the interconnection of its circuits as described herein will not infringe on existing patent rights.
3
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