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參數(shù)資料
| 型號： | TPS3619-33DGKR |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8 |
| 封裝： | 3.05 X 4.98 MM, GREEN, PLASTIC, MSOP-8 |
| 文件頁數(shù)： | 2/17頁 |
| 文件大?。?/td> | 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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| TPS3619-33DGKRG4 | 功能描述:監(jiān)控電路 Battery-Backup for RAM Retention RoHS:否 制造商:STMicroelectronics 監(jiān)測電壓數(shù): 監(jiān)測電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開關(guān):No Backup 上電復(fù)位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
| TPS3619-33-EP | 制造商:TI 制造商全稱:Texas Instruments 功能描述:BACKUP-BATTERY SUPERVISORS FOR RAM RETENTION |
| TPS3619-33MDGKREP | 功能描述:監(jiān)控電路 Mil Enhance Backup- Batt Sup RoHS:否 制造商:STMicroelectronics 監(jiān)測電壓數(shù): 監(jiān)測電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開關(guān):No Backup 上電復(fù)位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
| TPS3619-50 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:BACKUP-BATTERY SUPERVISORS FOR RAM RETENTION |
| TPS3619-50DGK | 功能描述:監(jiān)控電路 Battery-Backup for RAM Retention RoHS:否 制造商:STMicroelectronics 監(jiān)測電壓數(shù): 監(jiān)測電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開關(guān):No Backup 上電復(fù)位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
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