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參數(shù)資料
| 型號： | LTC693CS#TRPBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO16 |
| 封裝： | 0.300 INCH, PLASTIC, SOP-16 |
| 文件頁數(shù)： | 2/20頁 |
| 文件大小： | 244K |
| 代理商： | LTC693CS#TRPBF |
LTC692/LTC693
10
0692fb
The LTC692/LTC693 are protected for safe area operation
with a short-circuit limit. Output current is limited to ap-
proximately 200mA. If the device is overloaded for long
periods of time, thermal shutdown turns the power switch
off until the device cools down. The threshold temperature
for thermal shutdown is approximately 155°C with about
10°C of hysteresis which prevents the device from oscil-
lating in and out of shutdown.
The PNP switch used in competitive devices was not chosen
for the internal power switch because it injects unwanted
current into the substrate. This current is collected by the
VBATT pin in competitive devices and adds to the charging
current of the battery which can damage lithium batteries.
The LTC692/LTC693 use a charge-pumped NMOS power
switch to eliminate unwanted charging current while
achieving low dropout and low supply current. Since no
current goes to the substrate, the current collected by the
VBATT pin is strictly junction leakage.
A 125Ω PMOS switch connects the VBATT input to VOUT in
battery backup mode. The switch is designed for very low
dropout voltage (input-to-output differential). This feature
is advantageous for low current applications such as bat-
tery backup in CMOS RAM and other low power CMOS
circuitry. The supply current in battery backup mode is
1μA maximum.
The operating voltage at the VBATT pin ranges from 2.0V to
4.0V. High value capacitors, such as electrolytic or farad-
size double layer capacitors, can be used for short-term
memory backup instead of a battery. The charging resistor
for the rechargeable batteries should be connected to VOUT
since this eliminates the discharge path that exists when
the resistor is connected to VCC (Figure 3).
Replacing the Backup Battery
When changing the backup battery with system power on,
spurious resets can occur while the battery is removed
due to battery standby current. Although battery standby
current is only a tiny leakage current, it can still charge up
the stray capacitance on the VBATT pin. The oscillation cycle
is as follows: When VBATT reaches within 50mV of VCC,
the LTC692/LTC693 switch to battery backup. VOUT pulls
VBATT low and the devices go back to normal operation.
The leakage current then charges up the VBATT pin again
and the cycle repeats.
If spurious resets during battery replacement pose no
problems, then no action is required. Otherwise, a resistor
from VBATT to GND will hold the pin low while changing
the battery. For example, the battery standby current is
1μA maximum over temperature and the external resistor
required to hold VBATT below VCC is:
R
V
– 50mV
1A
CC
≤
μ
With VCC = 4.25V, a 3.9M resistor will work. With a 3V
battery, this resistor will draw only 0.77μA from the bat-
tery, which is negligible in most cases.
APPLICATIONS INFORMATION
5V
3V
0.1μF
VBATT
VCC
LTC693
VOUT
GND
4
3
1
2
5
ANY PNP POWER TRANSISTOR
692_3 F02
BATT ON
5V
3V
0.1μF
692_3 F03
VOUT – VBATT
R
I =
R
VBATT
VCC
LTC692
LTC693
VOUT
GND
Figure 2. Using BATT ON to Drive External PNP Transistor
Figure 3. Charging External Battery Through VOUT
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| LTC693CSW | 功能描述:IC MPU SUPERVISRY CIRCUIT 16SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 監(jiān)控器 系列:- 其它有關文件:STM6717 View All Specifications 標準包裝:1 系列:- 類型:多壓監(jiān)控器 監(jiān)視電壓數(shù)目:2 輸出:開路漏極或開路集電極 復位:低有效 復位超時:最小為 600 ms 電壓 - 閥值:1.11V，3.075V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SC-74A，SOT-753 供應商設備封裝:SOT-23-5 包裝:Digi-Reel® 產(chǎn)品目錄頁面:1194 (CN2011-ZH PDF) 其它名稱:497-7019-6 |
| LTC693CSW#PBF | 功能描述:IC MPU SUPERVISRY CIRCUIT 16SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 監(jiān)控器 系列:- 其它有關文件:STM6717 View All Specifications 標準包裝:1 系列:- 類型:多壓監(jiān)控器 監(jiān)視電壓數(shù)目:2 輸出:開路漏極或開路集電極 復位:低有效 復位超時:最小為 600 ms 電壓 - 閥值:1.11V，3.075V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SC-74A，SOT-753 供應商設備封裝:SOT-23-5 包裝:Digi-Reel® 產(chǎn)品目錄頁面:1194 (CN2011-ZH PDF) 其它名稱:497-7019-6 |
| LTC693CSW#TR | 功能描述:IC SUPERVISORY CIRC MPU 16SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 監(jiān)控器 系列:- 標準包裝:1 系列:- 類型:簡單復位/加電復位 監(jiān)視電壓數(shù)目:1 輸出:開路漏極或開路集電極 復位:高有效 復位超時:- 電壓 - 閥值:1.8V 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:6-TSOP（0.059"，1.50mm 寬）5 引線 供應商設備封裝:5-TSOP 包裝:剪切帶 (CT) 其它名稱:NCP301HSN18T1GOSCT |
| LTC693CSW#TRPBF | 功能描述:IC MPU SUPERVISRY CIRCUIT 16SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 監(jiān)控器 系列:- 標準包裝:1 系列:- 類型:簡單復位/加電復位 監(jiān)視電壓數(shù)目:1 輸出:開路漏極或開路集電極 復位:高有效 復位超時:- 電壓 - 閥值:1.8V 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:6-TSOP（0.059"，1.50mm 寬）5 引線 供應商設備封裝:5-TSOP 包裝:剪切帶 (CT) 其它名稱:NCP301HSN18T1GOSCT |
| LTC693I | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Microprocessor Supervisory Circuits |
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