- 您现在的位置：买卖IC网 > PDF目录98281 > TPS3818G25DRVRG4 (TEXAS INSTRUMENTS INC) 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO6 PDF资料下载
参数资料
| 型号： | TPS3818G25DRVRG4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 电源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO6 |
| 封装： | 2 X 2 MM, GREEN, PLASTIC, SON-6 |
| 文件页数： | 15/16页 |
| 文件大小： | 535K |
| 代理商： | TPS3818G25DRVRG4 |
DEVICE OPERATION
SENSE INPUT
RESET OUTPUT
V
IN
TPS3818G01
V
DD
SENSE
GND
RESET
R
1
R
2
1nF
V
=(1+)0.405
IT
R1
R2
V
OUT
MANUAL RESET (MR) INPUT
TPS3818G25
OMAP1510
MR
RESET
RESPWRON
1MW
2.5V
GND
SENSE V
DD
V
DDSHV 1, 3, 6, 7, 9
C
T
SBVS106A – MAY 2008 – REVISED AUGUST 2008 ......................................................................................................................................................... www.ti.com
supply line can be used to allow the reset signal for
The TPS3818 microprocessor supervisory product
the microprocessor to have a voltage higher than VDD
family is designed to assert a RESET signal when
(up to 6.5V). The pull-up resistor should be no
either the SENSE pin voltage drops below VIT or the
smaller than 10k
as a result of the finite impedance
manual reset (MR) is driven low. The RESET output
of the RESET line.
remains asserted for a user-adjustable time after both
the manual reset (MR) and SENSE voltages return
above the respective thresholds. A broad range of
voltage threshold and reset delay time adjustments
The SENSE input provides a terminal at which any
are available, allowing these devices to be used in a
system voltage can be monitored. If the voltage on
wide array of applications. Reset threshold voltages
this pin drops below VIT, then RESET is asserted.
can be factory-set from 0.82V to 3.3V or from 4.4V to
The comparator has a built-in hysteresis to ensure
5.0V, while the TPS3818G01 can be set to any
smooth RESET assertions and de-assertions. It is
voltage above 0.405V using an external resistor
good analog design practice to put a 1nF to 10nF
divider.
Two
preset
delay
times
are
also
bypass capacitor on the SENSE input to reduce
user-selectable: connecting the CT pin to VDD results
sensitivity to transients and layout parasitics.
in a 300ms reset delay, while leaving the CT pin open
The TPS3818G01 can be used to monitor any
yields a 20ms reset delay. In addition, connecting a
voltage rail down to 0.405V using the circuit shown in
capacitor between CT and GND allows the designer
to select any reset delay period from 1.25ms to 10s.
A typical application of the TPS3818G25 used with
the OMAP1510 processor is shown in Figure 10. The
open-drain RESET output is typically connected to
the RESET input of a microprocessor. A pull-up
resistor must be used to hold this line high when
RESET is not asserted. The RESET output is
undefined for voltage below 0.8V, but this is normally
not a problem because most microprocessors do not
function below this voltage. RESET remains high
(unasserted) as long as SENSE is above its threshold
Figure 11. Using the TPS3818G01 to Monitor a
(VIT) and the manual reset (MR) is logic high. If either
User-Defined Threshold Voltage
SENSE falls below VIT or MR is driven low, RESET is
asserted, driving the RESET pin to a low impedance.
The manual reset (MR) input allows a processor or
other logic circuit to initiate a reset. A logic low
(0.3VDD) on MR causes RESET to assert. After MR
returns to a logic high and SENSE is above its reset
threshold,
RESET
is
de-asserted
after
the
user-defined reset delay expires. Note that MR is
internally tied to VDD using a 90k resistor so this pin
can be left unconnected if MR is not used.
See Figure 12 for how MR can be used to monitor
multiple system voltages. Note that if the logic signal
driving MR does not go fully to VDD, there will be
Figure 10. Typical Application of the TPS3818
some additional current draw into VDD as a result of
with an OMAP Processor
the internal pull-up resistor on MR. To minimize
current draw, a logic-level FET can be used as
Once MR is again logic high and SENSE is above VIT
illustrated in Figure 13.
+ VHYS (the threshold hysteresis), a delay circuit is
enabled that holds RESET low for a specified reset
delay period. Once the reset delay has expired, the
RESET pin goes to a high impedance state. The
pull-up resistor from the open-drain RESET to the
8
Copyright 2008, Texas Instruments Incorporated
Product Folder Link(s): TPS3818
相关PDF资料 |
PDF描述 |
|---|---|
| TPS3837E18DBVRG4 | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO5 |
| TPS3837K33MDBVREP | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO5 |
| TPS40007DGQRG4 | SWITCHING CONTROLLER, 350 kHz SWITCHING FREQ-MAX, PDSO10 |
| TPS40009DGQG4 | SWITCHING CONTROLLER, 700 kHz SWITCHING FREQ-MAX, PDSO10 |
| TPS40009DGQRG4 | SWITCHING CONTROLLER, 700 kHz SWITCHING FREQ-MAX, PDSO10 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| TPS3818G25DRVT | 功能描述:监控电路 Lo Quies Crnt Acc Progr-Delay Sup Crct RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel |
| TPS3818G25DRVTG4 | 功能描述:监控电路 Low Quies Crnt Acc Prgrm-Delay Sup Crct RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel |
| TPS382033DBVR | 制造商:TI 功能描述:Pb Free |
| TPS3820-33DBVR | 功能描述:监控电路 Processor Sprvisry Circuits RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel |
| TPS3820-33DBVRG4 | 功能描述:监控电路 Processor Sprvisry Circuits RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel |
发布紧急采购，3分钟左右您将得到回复。