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參數資料
| 型號： | MIC2778-1BM5 |
| 廠商： | MICREL INC |
| 元件分類： | 電源管理 |
| 英文描述： | Voltage Monitor with Adjustable Hysteresis Preliminary Information |
| 中文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO5 |
| 封裝： | SOT-23, 5 PIN |
| 文件頁數： | 1/8頁 |
| 文件大小： | 65K |
| 代理商： | MIC2778-1BM5 |
October 1999
1
MIC2778
MIC2778
Micrel
MIC2778
Voltage Monitor with Adjustable Hysteresis
Preliminary Information
General Description
The MIC2778 is a voltage monitor—uniquely designed to
detect two separate voltage thresholds—combined with a
delay generator and logic. It is designed for monitoring the
battery supply of portable digital systems, particularly PDAs,
pagers, and cellular telephones.
High- and low-voltage thresholds can be adjusted indepen-
dently, allowing for wide hysteresis. Voltage detection thresh-
olds are accurate to 2%.
If the battery voltage falls below the low-voltage threshold, the
output (RST) is asserted and latched, preventing system
operation until the battery is replaced or recharged. Internal
logic prevents the output from chattering due to battery
recovery or load removal. The output is asserted for 140ms
(minimum) when a fresh battery is inserted. For applications
not requiring built-in delay, see MIC833.
The IC’s power supply input is separate from the detector
inputs, allowing the MIC2778 to be powered from a down-
stream supply, such a boost converter. Supply current is
extremely low (1
μ
A, typical), making it ideal for portable
applications.
A high-precision 1% grade is available. The MIC2778 is
supplied in Micrel’s IttyBitty 5-lead SOT-23-5 package.
Typical Application
HTH
RST
VDD
LTH
GND
MIC2778
604k
1%
56k
1%
340k
1%
EN
OUT
BYP
GND
IN
MIC5207-3.0BM5
100k
Li-Ion
Cell
470pF
V
3.0V
4.7μF
V
BAT(hi)
= 3.6V
V
BAT(lo)
= 3.1V
Cellular Telephone Battery Monitor
Features
Optimized for PDAs, cellular telephones, pagers,
and other battery-powered devices
Independently adjustable high- and
low-voltage thresholds
Internal logic prevents battery-voltage-fluctuation chatter
High
±
2% voltage threshold accuracy; 1% available
Built in 140ms (minimum) delay deglitches output
Extremely low 1
μ
A typical supply current
For applications not requiring built-in delay, see MIC833
Immune to brief power supply transients
5-lead SOT-23 package
Applications
PDAs
Pagers
Cordless phones
Consumer electronics
Embedded controllers
Personal electronics
Micrel, Inc. 1849 Fortune Drive San Jose, CA 95131 USA tel + 1 (408) 944-0800 fax + 1 (408) 944-0970 http://www.micrel.com
IttyBitty is a trademark of Micrel, Inc.
Ordering Information
Part Number
MIC2778-2BM5
MIC2778-1BM5
Marking
UFB
UFA
Accuracy
2%
1%
Temperature Range
–40
°
C to +85
°
C
–40
°
C to +85
°
C
Package
SOT-23-5
SOT-23-5
相關PDF資料 |
PDF描述 |
|---|---|
| MIC2778-2BM5 | Voltage Monitor with Adjustable Hysteresis Preliminary Information |
| MIC280-0YM6 | Precision IttyBitty Thermal Supervisor |
| MIC280-1YM6 | Precision IttyBitty Thermal Supervisor |
| MIC280-3YM6 | Precision IttyBitty Thermal Supervisor |
| MIC280-5YM6 | Precision IttyBitty Thermal Supervisor |
相關代理商/技術參數 |
參數描述 |
|---|---|
| MIC2778-1BM5 TR | 功能描述:IC SUPERVISOR ADJ HYSTER SOT23-5 RoHS:否 類別:集成電路 (IC) >> PMIC - 監控器 系列:- 標準包裝:1 系列:- 類型:簡單復位/加電復位 監視電壓數目:1 輸出:開路漏極或開路集電極 復位:低有效 復位超時:標準傳輸延遲為 60 µs 電壓 - 閥值:3V 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® 其它名稱:LM8364BALMF30DKR |
| MIC2778-1YM5 | 制造商:Rochester Electronics LLC 功能描述: 制造商:RF Micro Devices Inc 功能描述: |
| MIC2778-1YM5 TR | 功能描述:監控電路 V-Supervisor w/Adj. Hysteresis, Open-Drain Ouput, 1% Accuracy (Lead Free) RoHS:否 制造商:STMicroelectronics 監測電壓數: 監測電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復位:Resettable 監視器:No Watchdog 電池備用開關:No Backup 上電復位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
| MIC2778-1YM5-TR | 功能描述:Supervisor Open Drain or Open Collector 1 Channel SOT-23-5 制造商:microchip technology 系列:- 包裝:剪切帶（CT） 零件狀態:有效 類型:簡單復位/加電復位 受監控電壓數:1 輸出:開路漏極或開路集電極 復位:低有效 復位超時:最小為 140 ms 電壓 - 閾值:可調節/可選擇 工作溫度:-40°C ~ 85°C（TA） 安裝類型:表面貼裝 封裝/外殼:SC-74A，SOT-753 供應商器件封裝:SOT-23-5 標準包裝:1 |
| MIC2778-2BM5 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
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