参数资料
| 型号： | LT3587EUD#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 6/24页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST INV ADJ DL 20QFN |
| 标准包装： | 2,500 |
| 类型： | 升压（升压），反相 |
| 输出类型： | 可调式 |
| 输出数： | 2 |
| 输出电压： | 可调至 ±32V |
| 输入电压： | 2.5 V ~ 6 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 1MHz |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-WFQFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 20-QFN 裸露焊盘（3x3） |
LT3587
TYPICAL PERFORMANCE CHARACTERISTICS Speci?cations are at T A = 25°C unless otherwise noted.
EN/SS1, EN/SS3 Shutdown
Threshold vs Temperature
CAP3 Overvoltage Clamp
vs Temperature
0.45
V VIN = 3.6V
31
V VIN = 3.6V
0.40
30
0.35
29
0.30
0.25
28
0.20
–50
–25
0
25
50
75
100
125
27
–50
–25
0
25
50
75
100
125
TEMPERATURE (°C)
3587 G17
PIN FUNCTIONS
V OUT3 (Pin 1): Boost3 Output Pin. This pin is the drain of
an output disconnect PMOS transistor.
CAP3 (Pin 2): Boost3 Output Capacitor Pin. This pin is the
source of an output PMOS disconnect. Connect a capacitor
from this pin to ground.
SW3 (Pin 3): Boost3 Switch Pin. Connect an inductor
from this pin to V IN . Minimize trace area at this pin to
minimize EMI.
GND (Pin 4, 7, 8, 12): Ground Pins.
FLT (Pin 5): Fault Pin. This pin is a bidirectional open-
drain pull-down pin. This pin pulls low when any of the
enabled outputs fall out of regulation for more than 16ms.
Each output is ignored during start-up until its respective
enable/soft-start pin allows for full inductor current. This
pin can also be externally forced low to disable all the
supply outputs. Once this pin goes low (either due to an
out of regulation condition or externally forced low), the
pin latches low until the inputs to EN/SS1 and EN/SS3 are
set low or the input supply pin is recycled. Pull up this pin
to V IN with a 200k resistor when not used.
TEMPERATURE (°C)
3587 G18
FB2 (Pin 6): Inverter Output Voltage Feedback Pin. Con-
nect a resistor R FB2 from this pin to the Inverter Output
(V NEG ) such that:
R FB2 = |V NEG |/8μA
Note that FB2 pin voltage is about 0V when in regulation.
There is an internal 153k resistor from the FB2 pin to the
internal reference.
SW2 (Pin 9): Inverter Switch Pin. Connect an inductor
between this pin and V IN , as well as the ?ying capacitor
from this pin to the anode of the lnverter ground return
diode. Minimize trace area at this pin to minimize EMI.
NC (Pin 10): No Connect Pin. Leave open or connect to
ground.
SW1 (Pin 11): Boost1 Switch Pin. Connect an inductor
from this pin to V IN . Minimize trace area at this pin to
minimize EMI.
CAP1 (Pin 13): Boost1 Output Capacitor Pin. This pin
is the source of an output PMOS disconnect. Connect a
capacitor from this pin to ground.
3587fc
6
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