参数资料
| 型号： | LT3587EUD#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 11/24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
capacitance will slow down the switching waveform, which
can cause signi?cant switching losses at 1MHz switch-
ing frequency. Some recommended Schottky diodes are
listed in Table 2.
Table 2. Recommended Schottky Diodes
The same constraints as the other Schottky diodes ap-
ply for selecting D3. Therefore, the same recommended
Schottky diodes in Table 2 can be used for D3.
Boost3 Overcurrent and Overvoltage Protection
As brie?y discussed in the Operation section, the regula-
PART
FORWARD FORWARD
CURRENT VOLTAGE
DIODE
CAPACI-
TANCE
tion loop of Boost3 uses the maximum of the two voltages
at V FB3 and I FB3 as feedback information to set the peak
NUMBER
(mA)
DROP (V) (pF at 10V) MANUFACTURER
current of its power switch Q3. This allows for the Boost3
RSX051VA-30
PMEG401OCEJ
PMEG2005EB
1000
500
500
0.35
0.49
0.43
30
25
8
ROHM
www.rohm.com
NXP/Phillips
www.nxp.com
loop to be con?gured as either a boost voltage regulator
or a boost current regulator (Figure 3). Furthermore, this
architecture also allows for a programmable current limit on
voltage regulation or voltage limit on current regulation.
IR05H40CSPTR
B0540WS
500
500
0.48
0.48
39
20
Vishay
www.vishay.com
Diodes Inc.
V VIN
V VIN
ZLLS400
520
0.53
17
www.diodes.com
Zetex
www.zetex.com
V IN
LT3587
SW3
CAP3
V IN
LT3587
SW3
CAP3
I FB3
Smaller Footprint Inverter Topology
In certain applications with higher tolerance of current ripple
at the output of the inverter, the inductor L3 can be replaced
BOOST3
VOLTAGE
REGULATOR
EN/SS3
V OUT3
R VFB3
V FB3
VOLTAGE
REGULATION
FEEDBACK
R IFB3 RESISTOR
BOOST3
CURRENT
REGULATOR
EN/SS3
V OUT3
V FB3
I FB3
R IFB3
R VFB3
OPTIONAL
PROGRAMMABLE
VOLTAGE LIMIT
RESISTOR
with a Schottky diode. Since the Schottky diode footprint
is usually smaller than the inductor footprint, this alternate
OPTIONALPROGRAMMABLE
CURRENT LIMIT RESISTOR
CURRENT REGULATION
FEEDBACK RESISTOR
3587 F03
topology is recommended if a smaller overall solution is a
must. Note that this topology is only viable if the absolute
value of the inverter output is greater than V IN .
This Schottky diode is con?gured with the anode connected
to the output of the inverter and the cathode to the output
end of the ?ying capacitor C2 as shown in Figure 2.
Figure 3. Boost3 Con?gured as a Voltage
Regulator and as a Current Regulator
When con?gured as a boost voltage regulator, a feedback
resistor from the output pin V OUT3 to the V FB3 pin sets the
voltage level at V OUT3 at a ?xed level. In this case, the I FB3
pin can either be grounded if no current limiting is desired
or connected to ground with a resistor such that:
V VIN
2.5V TO 4.5V
L2
15μH
LT3587
SW2
C2
2.2μF
FB2
3587 F02
R FB1
1M
D3
INVERTER
OUTPUT
–8V, 100mA
I LIMIT = 200 ? (0.8V/R IFB3 )
where I LIMIT is the desired output current limit value. Recall
that the pull-up current on the I FB3 pin is controlled to be
typically 1/200 of the output load current at the V OUT3
pin. In this case, when the load current is less than I LIMIT ,
DS2
C7
22μF
the Boost3 loop regulates the voltage at the V FB3 pin to
0.8V. When there is an increase in load current beyond
I LIMIT , the voltage at V FB3 starts to drop and the voltage
Figure 2. Inverter Con?gured with a Schottky
Diode in Place of the Output Inductor
at I FB3 rises above 0.8V. The Boost3 loop then regulates
the voltage at the I FB3 pin to 0.8V, limiting the output
3587fc
11
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