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参数资料
| 型号： | LT1573IS8 |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 基准电压源/电流源 |
| 英文描述： | Low Dropout PNP Regulator Driver |
| 中文描述： | 1.27 V-6.8 V ADJUSTABLE POSITIVE LDO REGULATOR, 0.35 V DROPOUT, PDSO8 |
| 封装： | 0.150 INCH, PLASTIC, SO-8 |
| 文件页数： | 12/16页 |
| 文件大小： | 200K |
| 代理商： | LT1573IS8 |
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LT1573
needed during output transients, more capacitance can be
added to the regulator output. If more capacitance is
added to the output, the bandwidth of the regulator is
lowered. A large value compensation capacitor may be
needed to lower the frequency of the compensation zero to
avoid high frequency oscillation. Equal value output
capacitors with different ESR can have different output
transient response. High frequency performance will be
strongly affected by parasitics in the output capacitor and
board layout. Some experimentation with the external
compensation will be required for optimum results.
Shutdown Function
The regulator can be shut down by pulling the SHDN pin
voltage higher than the shutdown threshold (about 1.3V).
The regulator will restart itself if the SHDN is pulled below
the shutdown threshold.The SHDN pin should be tied to
ground if it is not used. The SHDN pin voltage can be
higher than the input voltage. When the SHDN pin voltage
is higher than 2V, the SHDN pin current increases and is
limited by a 20k resistor. Momentarily putting the device
into shutdown also resets the overcurrent latch.
Lower Dropout Voltage or Higher Output
Current Capability
Lower dropout voltage or higher output current capability
can be achieved by paralleling several output PNP transis-
tors as shown in Figure 3. By paralleling output PNP
transistors, the equivalent resistance between the emit-
ters (V
IN
) and collectors (V
OUT
) is lowered or each PNP
transistor sharing the output current now runs at a lower
collector current, which causes the dropout voltage to
decrease. Because the PNP transistors are running at a
lower collector current where the transistor beta is higher,
much more output current can be obtained at a given base
drive current. When paralleling two or more output tran-
sistors, a separate resistor is needed for R
B
and R
D
for
each output transistor. This allows the base drive current
to be split evenly between output transistors, which pro-
motes equal output current sharing. In the specific
example drawn in Figure 3 with two output transistors, the
resistance of R
B1
and R
B2
is now twice the value of the
resistance of R
B
in Figure 2, and the resistance of R
D1
and
R
D2
is twice the value of the resistance of R
D
in Figure 2.
In case of n PNP transistors in parallel, the resistance R
B
COMP
V
OUT
V
IN
DRIVE
FB
LATCH
SHDN
GND
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+
C
TIME
C
OUT1
C
C
V
IN
R
C
V
OUT
GND
1573 F03
R
B1
R
B2
R
D2
R
D1
R1
R2
LOAD
+
Q
OUT2
Q
OUT1
C
IN
Figure 3. Reduced Dropout Voltage or Increased Output Current
by Paralleling Output PNP Transistors
APPLICATIOU
W
U
U
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT1573IS8#PBF | 功能描述:IC REG CTRLR SGL POS ADJ 8-SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性晶体管驱动器 系列:- 产品培训模块:More Information on LDOs 标准包装:2,500 系列:- 类型:正，固定式 输出数:2 输出电压:2.8V，3.3V 电流 - 电源:12mA 输入电压:5 V ~ 22 V 工作温度:0°C ~ 70°C 封装/外壳:16-SOIC（0.154"，3.90mm 宽） 供应商设备封装:16-SOIC 包装:带卷 (TR) |
| LT1573IS8#TR | 功能描述:IC REG CTRLR SGL POS ADJ 8SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性晶体管驱动器 系列:- 产品培训模块:More Information on LDOs 标准包装:2,500 系列:- 类型:正，固定式 输出数:2 输出电压:2.8V，3.3V 电流 - 电源:12mA 输入电压:5 V ~ 22 V 工作温度:0°C ~ 70°C 封装/外壳:16-SOIC（0.154"，3.90mm 宽） 供应商设备封装:16-SOIC 包装:带卷 (TR) |
| LT1573IS8#TRPBF | 功能描述:IC REG CTRLR SGL POS ADJ 8-SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性晶体管驱动器 系列:- 产品培训模块:More Information on LDOs 标准包装:2,500 系列:- 类型:正，固定式 输出数:2 输出电压:2.8V，3.3V 电流 - 电源:12mA 输入电压:5 V ~ 22 V 工作温度:0°C ~ 70°C 封装/外壳:16-SOIC（0.154"，3.90mm 宽） 供应商设备封装:16-SOIC 包装:带卷 (TR) |
| LT1575 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Ultrafast Transient Response, Low Dropout Regulators Adjustable and Fixed |
| LT-1575-113-006 | 制造商:Carling Technologies 功能描述:LT-SERIES TOGGLE SWITCH - Bulk |
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