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参数资料
| 型号： | LTC693CS#TRPBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 电源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO16 |
| 封装： | 0.300 INCH, PLASTIC, SOP-16 |
| 文件页数： | 20/20页 |
| 文件大小： | 244K |
| 代理商： | LTC693CS#TRPBF |
LTC692/LTC693
9
0692fb
APPLICATIONS INFORMATION
Microprocessor Reset
The LTC692/LTC693 use a bandgap voltage reference
and a precision voltage comparator C1 to monitor the
5V supply input on VCC (see Block Diagram). When VCC
falls below the reset voltage threshold, the RESET output
is forced to active low state. The reset voltage threshold
accounts for a 10% variation on VCC, so the RESET output
becomes active low when VCC falls below 4.50V (4.40V
typical). On power-up, the RESET signal is held active low
for a minimum of 140ms after reset voltage threshold is
reached to allow the power supply and microprocessor to
stabilize. The reset active time is adjustable on the LTC693.
On power down, the RESET signal remains active low
even with VCC as low as 1V. This capability helps hold the
microprocessor in stable shutdown condition. Figure 1
shows the timing diagram of the RESET signal.
The precision voltage comparator, C1, typically has 40mV
of hysteresis which ensures that glitches at the VCC pin do
not activate the RESET output. Response time is typically
10μs. To help prevent mistriggering due to transient loads,
VCC pin should be bypassed with a 0.1μF capacitor with
the leads trimmed as short as possible.
The LTC693 has two additional outputs: RESET and
LOW LINE. RESET is an active high output and is the
inverse of RESET. LOW LINE is the output of the preci-
sion voltage comparator, C1. When VCC falls below the
reset voltage threshold, LOW LINE goes low. LOW LINE
returns high as soon as VCC rises above the reset volt-
age threshold.
Battery Switchover
The battery switchover circuit compares VCC to the VBATT
input, and connects VOUT to whichever is higher. When
VCC rises to 70mV above VBATT, the battery switchover
comparator, C2, connects VOUT to VCC through a charge
pumped NMOS power switch, M1. When VCC falls to 50mV
above VBATT, C2 connects VOUT to VBATT through a PMOS
switch, M2. C2 has typically 20mV of hysteresis to prevent
spurious switching when VCCremainsnearlyequaltoVBATT.
The response time of C2 is approximately 20μs.
During normal operation, the LTC692/LTC693 use a charge
pumped NMOS power switch to achieve low dropout and
low supply current. This power switch can deliver up to
50mA to VOUT from VCC and has a typical on-resistance
of 5Ω. The VOUT pin should be bypassed with a capaci-
tor of 0.1μF or greater to ensure stability. Use of a larger
bypass capacitor is advantageous for supplying current
to heavy transient loads.
When operating currents larger than 50mA are required
from VOUT, or a lower dropout (VCC – VOUT voltage dif-
ferential) is desired, the LTC693 should be used. This
product provides BATT ON output to drive the base of the
external PNP transistor (Figure 2). If higher currents are
needed with the LTC692, a high current Schottky diode can
be connected from the VCC pin to the VOUT pin to supply
the extra current.
VCC
t1
t1 = RESET ACTIVE TIME
V1 = RESET VOLTAGE THRESHOLD
V2 = RESET VOLTAGE THRESHOLD +
RESET THRESHOLD HYSTERESIS
t1
V2
V1
692_3 F01
RESET
LOW LINE
Figure 1. Reset Active Time
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC693CSW | 功能描述:IC MPU SUPERVISRY CIRCUIT 16SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 监控器 系列:- 其它有关文件:STM6717 View All Specifications 标准包装:1 系列:- 类型:多压监控器 监视电压数目:2 输出:开路漏极或开路集电极 复位:低有效 复位超时:最小为 600 ms 电压 - 阀值:1.11V，3.075V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SC-74A，SOT-753 供应商设备封装:SOT-23-5 包装:Digi-Reel® 产品目录页面:1194 (CN2011-ZH PDF) 其它名称:497-7019-6 |
| LTC693CSW#PBF | 功能描述:IC MPU SUPERVISRY CIRCUIT 16SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 监控器 系列:- 其它有关文件:STM6717 View All Specifications 标准包装:1 系列:- 类型:多压监控器 监视电压数目:2 输出:开路漏极或开路集电极 复位:低有效 复位超时:最小为 600 ms 电压 - 阀值:1.11V，3.075V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SC-74A，SOT-753 供应商设备封装:SOT-23-5 包装:Digi-Reel® 产品目录页面:1194 (CN2011-ZH PDF) 其它名称:497-7019-6 |
| LTC693CSW#TR | 功能描述:IC SUPERVISORY CIRC MPU 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 |
| LTC693CSW#TRPBF | 功能描述:IC MPU SUPERVISRY CIRCUIT 16SOIC RoHS:是 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 |
| LTC693I | 制造商:LINER 制造商全称:Linear Technology 功能描述:Microprocessor Supervisory Circuits |
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