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参数资料
| 型号： | LTC695IN-3.3#TRPBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 电源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY MANAGEMENT CKT, PDIP16 |
| 封装： | 0.300 INCH, LEAD FREE, PLASTIC, DIP-16 |
| 文件页数： | 2/20页 |
| 文件大小： | 189K |
| 代理商： | LTC695IN-3.3#TRPBF |
LTC694-3.3/LTC695-3.3
10
69453fb
APPLICATIONS INFORMATION
The LTC694-3.3/LTC695-3.3 are protected for safe area
operation with short-circuit limit. Output current is limited
to approximately 200mA. If the device is overloaded for
a long period 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 oscillating 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 LTC694-3.3/LTC695-3.3 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
VBATT pin is strictly junction leakage.
A 125Ω PMOS switch connects the VBATT input to VOUT
in battery back-up mode. The switch is designed for very
low dropout voltage (input-to-output differential). This
feature is advantageous for low current applications such
as battery back-up in CMOS RAM and other low power
CMOS circuitry. The supply current in battery back-up
mode is 1μA maximum.
The operating voltage at the VBATT pin ranges from 1.5V
to 2.75V. The charging resistor for 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 Back-Up Battery
When changing the back-up 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 LTC694-3.3/LTC695-3.3 switch to battery backup.
VOUT pulls VBATT low and the device goes 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 so the external resistor
required to hold VBATT below VCC is:
R
≤
VCC – 50mV
1A
With VCC = 3V, a 2.7M resistor will work. With a 2V battery,
this resistor will draw only 0.7μA from the battery, which
is negligible in most cases.
Figure 2. Using BATT ON to Drive External PNP Transistor
3.3V
2.4V
0.1μF
VBATT
VCC
LTC695-3.3
VOUT
GND
4
3
1
2
5
ANY PNP POWER TRANSISTOR
694/5-3.3 F02
BATT ON
Figure 3. Charging External Battery Through VOUT
3.3V
2.4V
0.1μF
VBATT
VCC
LTC694-3.3
LTC695-3.3
VOUT
GND
694/5-3.3 F03
VOUT – VBATT
R
I =
R
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC695INPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Microprocessor Supervisory Circuits |
| LTC695IN-PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Microprocessor Supervisory Circuits |
| LTC695IS | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Power Supply Supervisor |
| LTC695IS-3.3 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Power Supply Supervisor |
| LTC695ISW | 功能描述:IC MPU SUPERVISRY CIRCUIT 16SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 监控器 系列:- 标准包装:1 系列:- 类型:简单复位/加电复位 监视电压数目:1 输出:开路漏极或开路集电极 复位:高有效 复位超时:- 电压 - 阀值:1.8V 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:6-TSOP（0.059"，1.50mm 宽）5 引线 供应商设备封装:5-TSOP 包装:剪切带 (CT) 其它名称:NCP301HSN18T1GOSCT |
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