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| 型号： | LT1572CS#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 2/12页 |
| 文件大小： | 0K |
| 描述： | IC REG MULTI CONFIG 1.25A 16SOIC |
| 标准包装： | 2,500 |
| 类型： | 降压（降压），升压（升压），反相，Cuk，回扫，正向转换器，Sepic |
| 输出数： | 1 |
| 输入电压： | 3 V ~ 30 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 100kHz |
| 电流 - 输出： | 1.25A |
| 同步整流器： | 无 |
| 工作温度： | 0°C ~ 100°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SOIC（0.154"，3.90mm 宽） |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 16-SOIC |
LT1572
A BSOLUTE
A XI U
R A TI G S
PACKAGE/ORDER I FOR ATIO
Supply Voltage (Note 4).......................................... 40V
Switch Output Voltage (Note 4) .............................. 60V
Feedback Pin Voltage (Transient, 1ms) ................ ± 15V
Operating Junction Temperature Range
Operating .............................................. 0 ° C to 100 ° C
Short Circuit ......................................... 0 ° C to 125 ° C
Storage Temperature Range ............... – 65 ° C to 150 ° C
Lead Temperature (Soldering, 10 sec)................. 300 ° C
DIODE
NC 1
ANODE* 2
CATHODE* 3
GND 4
V C 5
FB 6
NC 7
NC 8
TOP VIEW
16 NC
15 ANODE*
14 CATHODE*
13 GND
12 E2
11 V SW
10 E1
9 V IN
ORDER PART
NUMBER
LT1572CS
R × I L + V f
t × f
Average Forward Current .......................................... 1A
Peak Repetitive Forward Current .............................. 2A
Peak Non-Repetitive Forward Current....................... 3A
Peak Repetitive Reverse Voltage............................. 20V
Continuous (Average) Reverse Voltage .................. 15V
Operating Junction Temperature ......................... 125 ° C
Note 1: Minimum effective switch “on” time for the LT1572 (in current
limit only) is ≈ 0.6 μ s. This limits the maximum safe input voltage during
an output shorted condition. Buck mode and inverting mode input voltage
during an output shorted condition is limited to:
V IN (max, output shorted) = 15V +
buck and inverting mode
R = Inductor DC resistance
I L = 2.5A
V f = Output catch diode forward voltage at I L
t = 0.6 μ s, f = 100kHz switching frequency
S PACKAGE
16-LEAD PLASTIC SO
*ALWAYS CONNECT BOTH ANODE
AND BOTH CATHODE PINS
T JMAX (REGULATOR) = 100 ° C
T JMAX (DIODE) = 125 ° C
SEE THERMAL MANAGEMENT SECTION FOR θ JA
Consult factory for Industrial and Military grade parts.
Maximum input voltage can be increased by increasing R or V f .
External current limiting such as that shown in AN19, Figure 39, will
provide protection up to the full supply voltage rating. C1 in Figure 39
should be reduced to 200pF.
Transformer designs will tolerate much higher input voltages because
leakage inductance limits rate of rise of current in the switch. These
designs must be evaluated individually to assure that current limit is well
controlled up to maximum input voltage.
Boost mode designs are never protected against output shorts because
the external catch diode and inductor connect input to output.
ELECTRICAL C HARA C TERISTICS
V IN = 15V, V C = 0.5V, V FB = V REF , output pin open, unless otherwise noted.
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V REF
I B
Reference Voltage
Feedback Input Current
Measured at Feedback Pin
V C = 0.8V
V FB = V REF
q
1.224
1.214
1.244
1.244
350
1.264
1.274
750
V
V
nA
q
1100
nA
g m
Error Amplifier
Transconductance
Error Amplifier Source or
Sink Current
? I C = ± 25 μ A
V C = 1.5V
q
q
3000
2400
150
120
4400
200
6000
7000
350
400
μ mho
μ mho
μ A
μ A
Error Amplifier Clamp
Hi Clamp, V FB = 1V
1.80
2.30
V
Voltage
Reference Voltage Line
Lo Clamp, V FB = 1.5V
3V ≤ V IN ≤ 40V
q
0.25
0.38
0.52
0.03
V
%/V
Regulation
V C = 0.8V
A V
Error Amplifier Voltage Gain
Minimum Input Voltage (Note 3)
0.9V ≤ V C ≤ 1.4V
q
500
800
2.6
3.0
V/V
V
I Q
Supply Current
3V ≤ V IN ≤ 40V, V C = 0.6V
6
9
mA
2
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