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| 型号： | TPS3808G01QDBVRQ1 |
| 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： | GREEN, PLASTIC, SOT-23, 6 PIN |
| 文件页数： | 20/20页 |
| 文件大小： | 659K |
| 代理商： | TPS3808G01QDBVRQ1 |
3.3V
TP S 38 08xx x
V
DD
SENSE
C
T
90k
G ND
C
T (nF)
+ tD (s)*0.5
10*3 (s)
175
Delay (s) = CT (nF) + 0.5 x 103 (s)
20ms Delay
300ms Delay
(c)
(b)
(a)
175
3.3V
TPS3808G33
V
DD
SENSE
C
T
RESET
3.3V
TPS3808G33
V
DD
SENSE
C
T
C
T
RESET
3.3V
TPS3808G33
V
DD
SENSE
C
T
50k
RESET
www.ti.com
SBVS085G – JANUARY 2007 – REVISED DECEMBER 2010
Figure 11. Using an External MOSFET to Minimize IDD When MR Signal Does Not Go to VDD
Selecting the Reset Delay Time
The TPS3808 has three options for setting the RESET delay time as shown in Figure 12. Figure 12a shows the
configuration for a fixed 300-ms typical delay time by tying CT to VDD; a resistor from 40 k to 200 k must be
used. Supply current is not affected by the choice of resistor. Figure 12b shows a fixed 20-ms delay time by
leaving the CT pin open. Figure 12c shows a ground referenced capacitor connected to CT for a user-defined
program time between 1.25 ms and 10 s.
The capacitor CT should be ≥100 pF nominal value in order for the TPS3808 to recognize that the capacitor is
present. The capacitor value for a given delay time can be calculated using the following equation:
(1)
The reset delay time is determined by the time it takes an on-chip precision 220-nA current source to charge the
external capacitor to 1.23 V. When a RESET is asserted, the capacitor is discharged. When the RESET
conditions are cleared, the internal current source is enabled and begins to charge the external capacitor. When
the voltage on this capacitor reaches 1.23 V, RESET is deasserted. Note that a low-leakage type capacitor such
as a ceramic should be used and that stray capacitance around this pin may cause errors in the reset delay time.
Immunity to SENSE Pin Voltage Transients
The TPS3808 is relatively immune to short negative transients on the SENSE pin. Sensitivity to transients is
dependent on threshold overdrive, as shown in the Maximum Transient Duration at Sense vs Sense Threshold
Overdrive Voltage graph (Figure 5) in the Typical Characteristics section.
Figure 12. Configuration Used to Set the RESET Delay Time
Copyright 2007–2010, Texas Instruments Incorporated
9
Product Folder Link(s): TPS3808-Q1
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| TPS3808G01QDRVRQ1 | 功能描述:监控电路 AC Low Quies Crnt 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 |
| TPS3808G09DBVR | 功能描述:监控电路 Programmable-Delay Supervisory 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 |
| TPS3808G09DBVR | 制造商:Texas Instruments 功能描述:PROGRAMMABLE-DELAY SUPERVISORY CIRCUIT 制造商:Texas Instruments 功能描述:IC, SUPERVISORY CKT 2.7 uA, 6.5V, SOT23-6 |
| TPS3808G09DBVRG4 | 功能描述:监控电路 Programmable-Delay Supervisory 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 |
| TPS3808G09DBVT | 功能描述:监控电路 Programmable-Delay Supervisory 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 |
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