参数资料
| 型号： | LT3587EUD#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 14/24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
APPLICATIONS INFORMATION
Output Disconnect
Both the Boost1 and the Boost3 channels have an output
disconnect between their respective CAP pin and V OUT
pin. This disconnect feature prevents a DC path from V IN
to V OUT .
For Boost1, this output disconnect feature is implemented
using a PMOS (M1) as shown in the Block Diagram in
Figure 1. When turned on, M1 is driven hard in the linear
region to reduce power dissipation when delivering cur-
rent between the CAP1 pin and the V OUT1 pin. M1 stays
on as long as the voltage difference between CAP1 and
V IN is greater than 2.5V. This allows for the positive bias
to stay high for as long as possible as the negative bias
The output disconnect feature on Boost3 is implemented
similarly using M3. However, in this case M3 is only turned
off when the EN/SS3 pin voltage is less than 200mV and
the Boost3 regulation loop is disabled.
The disconnect transistor M3 is also current limited, pro-
viding a maximum output current at V OUT3 of 110mA (typ).
M3 also has a similar protection circuit as M1 that limits
the voltage drop across CAP3 and V OUT3 to about 10V.
Figure 8 shows the output voltage and current during an
overload event with V CAP3 initially at 24V.
I VOUT3
500mA/DIV
discharges during turn off.
The disconnect transistor M1 is current limited to provide a
maximum output current of 155mA (typ). However, there is
also a protection circuit for M1 that limits the voltage drop
across CAP1 and V OUT1 to about 10V. When the voltage at
I L4
500mA/DIV
V CAP3
10V/DIV
V VOUT3
10V/DIV
0mA
24V
CAP1 is greater than 10V, in an overload or a short-circuit
event, M1 current is limited to 155mA until the voltage
across CAP1 to V OUT1 grows to about 10V. Then M1 is
turned on hard without any current limit to allow for the
I VOUT3
500mA/DIV
40μs/DIV
3587 F08a
voltage on CAP1 to discharge as fast as possible. When
the voltage across CAP1 and V OUT1 reduces to less than
10V, the output current is then again limited to 155mA.
Figure 7 shows the output voltage and current during an
overload event with V CAP1 initially at 15V.
I L4
500mA/DIV
V CAP3
10V/DIV
V VOUT3
10V/DIV
0mA
24V
V VIN = 3.6V
C4 = 1μF
40μs/DIV
3587 F08b
I VOUT1
500mA/DIV
I L1
500mA/DIV
V CAP1
10V/DIV
V VOUT1
10V/DIV
0mA
15V
15V
Figure 8. V CAP3 , V VOUT3 , I VOUT3 and I L4 During a Short-Circuit
Condition with and Without Programmed 20mA Current Limit
Choosing A Feedback Node
Boost1 feedback resistor, R FB1 , may be connected to the
V OUT1 pin or the CAP1 pin (see Figure 9). Similarly for
Boost3 in a boost voltage regulator con?guration, the
V VIN = 3.6V
C1 = 4.7μF
40μs/DIV
3587 F07
feedback resistor, R VFB3 , may be connected to the V OUT3
pin or the CAP3 pin. Regulating the V OUT1 and V OUT3 pins
Figure 7. V CAP1 ,V VOUT1 , I VOUT1 and I L1 During a Short-Circuit Event
eliminates the output offset resulting from the voltage drop
across the output disconnect PMOS transistors.
3587fc
14
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