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參數(shù)資料
| 型號： | ML4854 |
| 廠商： | Fairchild Semiconductor Corporation |
| 英文描述： | Adjustable, Low-Current, 2-Cell Boost Regulator with Shutdown and Low Battery Detect |
| 中文描述： | 可調(diào)，低電流，2節(jié)電池升壓關(guān)機和低電池檢測穩(wěn)壓器 |
| 文件頁數(shù)： | 1/13頁 |
| 文件大?。?/td> | 133K |
| 代理商： | ML4854 |
www.fairchildsemi.com
REV. 1.0.7 5/6/03
Features
95% Efficiency at 200mA Load Current
Integrated Peak Current Limit
Variable Output Voltage Determined by External Resistors
Variable On-time Pulse Frequency Modulation (PFM)
Fully Internal Synchronous Rectifier (no external diodes)
for High Efficiency and Low Peak Currents
Low-Battery Detection
Logic Controlled Shutdown with True Load Disconnect
Applications
2-3 alkaline/NiMH cells or 1 Li-Ion cell Operated Devices
Cell Phones
Medical Devices
PDAs
Portable Instrumentation
General Description
The ML4854 is a low power boost regulator designed for
low voltage DC to DC conversion in two-cell battery pow-
ered systems such as cell phones and PDAs. The converter
starts up at 1.3V and has an operating input voltage range
from 1.6V to 4.5V. After the start it operates at an input
voltage as low as 0.8V. Output voltage can be adjusted by
external resistors from 3.3V to 5V with a maximum load
current of 0.5A.
Quiescent current in shut down mode is less than 30μA,
which maximizes the battery live time. The ON time changes
with the input voltage to maintain the ripple current constant
and to provide the highest efficiency over a wide load range,
while maintaining low peak currents in the boost inductor.
The combination of integrated synchronous rectification,
variable frequency operation, and low supply current make
ML4854 ideal for portable applications.
The ML4854 is available in an 8 lead TSSOP package.
ML4854
Adjustable, Low-Current, 2-Cell Boost Regulator
with Shutdown and Low Battery Detect
Typical Application
V
IN
Input 1.6V
to 4.5V
On
Off
Low Battery
Detect In
Low Battery
Detect Out
Output 3.3V to 5V
up to 0.5A
ML4854
SHDN
LBI
LB0
GND
V
L
V
OUT
FB
1
2
3
4
8
7
6
5
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PDF描述 |
|---|---|
| ML4861 | Low Voltage Drop Boost Regulator(低壓差升壓穩(wěn)壓器) |
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| ML4865CS-2 | High Voltage High Current Boost Regulator |
| ML4865 | High Voltage High Current Boost Regulator |
| ML4866 | 3.3V Output DC-DC Step-Down Converter(3.3V輸出的DC-DC步降變換器) |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ML4854IT | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| ML4854ITX | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| ML485-G | 功能描述:射頻混合器 1.6-3.2 GHz High IP3 Mixer w/ Int LO Amp RoHS:否 制造商:NXP Semiconductors 頻率范圍: 轉(zhuǎn)換損失——最大: 工作電源電壓:6 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 安裝風(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
| ML485-PCB | 功能描述:射頻開發(fā)工具 ML485 1.6-3.2GHz Eval Brd Active Mxr RoHS:否 制造商:Taiyo Yuden 產(chǎn)品:Wireless Modules 類型:Wireless Audio 工具用于評估:WYSAAVDX7 頻率: 工作電源電壓:3.4 V to 5.5 V |
| ML485TRG | 制造商:TriQuint Semiconductor 功能描述:RF MIXER |
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