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参数资料
| 型号： | TPS3619-33DGKR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 电源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8 |
| 封装： | 3.05 X 4.98 MM, GREEN, PLASTIC, MSOP-8 |
| 文件页数： | 2/17页 |
| 文件大小： | 494K |
| 代理商： | TPS3619-33DGKR |
www.ti.com
DETAILED DESCRIPTION
Battery Freshness Seal (TPS3619)
Power-Fail Comparator (PFI and PFO)
Backup-Battery Switchover
SLVS387H – APRIL 2001 – REVISED DECEMBER 2007
The battery freshness seal of the TPS3619 family disconnects the backup-battery from internal circuitry until it is
needed. This function prevents the backup-battery from being discharged unitl the final product is put to use. The
following steps explain how to enable the freshness seal mode.
1. Connect VBAT (VBAT > VBAT min)
2. Ground PFO
3. Connect PFI to VDD (PFI = VDD)
4. Connect VDD to power supply (VDD > VIT) and keep connected for 5 ms < t < 35 ms
The battery freshness seal mode is automatically removed by the positive-going edge of RESET when VDD is
applied.
An additional comparator is provided to monitor voltages other than the nominal supply voltage. The
power-fail-input (PFI) is compared with an internal voltage reference of 1.15 V. If the input voltage falls below the
power-fail threshold VIT(PFI) of typical 1.15 V, the power-fail output (PFO) goes low. If VIT(PFI) goes above V(PFI),
plus about 12-mV hysteresis, the output returns to high. By connecting two external resistors, it is possible to
supervise any voltages above V(PFI). The sum of both resistors should be about 1 M, to minimize power
consumption and also to assure that the current in the PFI pin can be ignored compared with the current through
the resistor network. The tolerance of the external resistors should be not more than 1% to ensure minimal
variation of sensed voltage. If the power-fail comparator is unused, PFI should be connected to ground and PFO
left unconnected.
In case of a brownout or power failure, it may be necessary to preserve the contents of RAM. If a backup battery
is installed at VBAT, the device automatically switches the connected RAM to backup power when VDD fails. In
order to allow the backup battery (e.g., a 3.6-V lithium cell) to have a higher voltage than VDD, these supervisors
do not connect VBAT to VOUT when VBAT is greater than VDD. VBAT only connects to VOUT (through a 15- switch)
when VDD falls below VIT and VBAT is greater than VDD. When VDD recovers, switchover is deferred either until
VDD crosses VBAT, or until VDD rises above the reset threshold VIT. VOUT connects to VDD through a 1- (max)
PMOS switch when VDD crosses the reset threshold.
FUNCTION TABLE
VDD > VBAT
VDD > VIT
VOUT
1
VDD
1
0
VDD
0
1
VDD
0
VBAT
10
Copyright 2001–2007, Texas Instruments Incorporated
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相关代理商/技术参数 |
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| TPS3619-33DGKRG4 | 功能描述:监控电路 Battery-Backup for RAM Retention 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 |
| TPS3619-33-EP | 制造商:TI 制造商全称:Texas Instruments 功能描述:BACKUP-BATTERY SUPERVISORS FOR RAM RETENTION |
| TPS3619-33MDGKREP | 功能描述:监控电路 Mil Enhance Backup- Batt Sup 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 |
| TPS3619-50 | 制造商:TI 制造商全称:Texas Instruments 功能描述:BACKUP-BATTERY SUPERVISORS FOR RAM RETENTION |
| TPS3619-50DGK | 功能描述:监控电路 Battery-Backup for RAM Retention 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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