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參數(shù)資料
| 型號： | TPS3619-50MDGKREP |
| 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： | PLASTIC, MSOP-8 |
| 文件頁數(shù)： | 3/18頁 |
| 文件大?。?/td> | 451K |
| 代理商： | TPS3619-50MDGKREP |
www.ti.com
SGLS350C – JULY 2006 – REVISED SEPTEMBER 2010
DETAILED DESCRIPTION
Battery Freshness Seal (TPS3619)
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 until 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 retain for 5 ms < t < 35 ms
The battery freshness seal mode is removed automatically by the positive-going edge of RESET when VDD is
applied.
Power-Fail Input/Output Comparator (PFI and PFO)
An additional comparator is provided to monitor voltages other than the nominal supply voltage. The 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 1.15 V (typ), the 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 ensure 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.
Backup-Battery Switchover
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 the VIT and VBAT is greater than VDD. When VDD recovers, switchover is deferred, either
until VDD crosses VBAT or until VDD rises above VIT. VOUT connects to VDD through a 1- (max) PMOS switch
when VDD crosses the reset threshold.
Table 2. FUNCTION TABLE
VDD > VBAT
VDD > VIT
VOUT
1
VDD
1
0
VDD
0
1
VDD
0
VBAT
Copyright 2006–2010, Texas Instruments Incorporated
11
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TPS3620-33 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:BACKUP-BATTERY SUPERVISORS FOR RAM RETENTION |
| TPS3620-33DGK | 制造商:TI 制造商全稱:Texas Instruments 功能描述:BACKUP-BATTERY SUPERVISORS FOR RAM RETENTION |
| TPS3620-33DGKR | 功能描述:監(jiān)控電路 3.3-V 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 |
| TPS3620-33DGKRG4 | 功能描述:監(jiān)控電路 3.3-V 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 |
| TPS3620-33DGKT | 功能描述:監(jiān)控電路 3.3-V 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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