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參數(shù)資料
| 型號： | LT3479 |
| 廠商： | Linear Technology Corporation |
| 元件分類： | LED驅(qū)動器 |
| 英文描述： | Single Cell 350mA LED Driver |
| 中文描述： | 單細胞350mA的LED驅(qū)動器 |
| 文件頁數(shù)： | 1/12頁 |
| 文件大小： | 123K |
| 代理商： | LT3479 |
1
LTC3490
3490f
■
Portable Lighting
■
Rechargeable Flashlights
Single Cell Minimum Component LED Driver
Single Cell 350mA
LED Driver
■
350mA Constant Current Output
■
2.8V to 4V Output Compliance
■
1- or 2-Cell NiMH or Alkaline Input
■
Synchronous Rectification: Up to 90% Efficiency
■
Fixed Frequency Operation: 1.3MHz
■
Low Quiescient Current: <1mA
■
Very Low Shutdown Current: <50
μ
A
■
Open LED Output Limited to 4.7V
■
V
IN
Range: 1V to 3.2V
■
Dimming Control
■
Undervoltage Lockout to Protect Batteries
■
Low Profile (0.75mm) 3mm
×
3mm Thermally
Enhanced 8-Lead DD and S8 Packages
APPLICATIU
Efficiency vs V
IN
at V
LED
= 3.5V
FEATURES
DESCRIPTIOU
The LTC
3490 provides a constant current drive for 1W
LED applications. It is a high efficiency boost converter
that operates from 1 or 2 NiMH or alkaline cells and
generates 350mA of constant current with up to 4V of
compliance. It contains a 100m
NFET switch and a
130m
PFET synchronous rectifier. The fixed switching
frequency is internally set to 1.3MHz.
The LTC3490 limits the output voltage to 4.7V if the output
load is disconnected. It also features an analog dimming
capability that reduces the drive current proportional to
the CTRL/SHDN pin voltage. A low-battery logic output
signals when the battery has dropped below 1V/cell. An
undervoltage lockout circuit shuts down the LTC3490
when the battery voltage drops below 0.85V/cell. The
feedback loop is internally compensated to minimize com-
ponent count.
TYPICAL APPLICATIO
U
+
SW
CAP
ON/OFF
LED
1 NiMH OR
ALKALINE
CELL
4.7
μ
F
LOBAT
3490 TA01
V
IN
CTRL/SHDN
CELLS
1M
HIGH
CURRENT
LED
GND
LTC3490
3.3
μ
H
350mA
V
IN
(V)
1
0
E
10
30
40
50
100
70
1.5
2
3490 TA02
20
80
90
60
2.5
3
I
OUT
= 350mA
, LTC and LT are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| LT3479EDE | 制造商:Linear Technology 功能描述:Conv DC-DC Single Step Up 2.5V to 24V 14-Pin DFN EP |
| LT3479EDE#PBF | 功能描述:IC REG BOOST INV ADJ 3A 14DFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關穩(wěn)壓器 系列:- 標準包裝:250 系列:- 類型:降壓（降壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:1.2V 輸入電壓:2.05 V ~ 6 V PWM 型:電壓模式 頻率 - 開關:2MHz 電流 - 輸出:500mA 同步整流器:是 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:6-UFDFN 包裝:帶卷 (TR) 供應商設備封裝:6-SON（1.45x1） 產(chǎn)品目錄頁面:1032 (CN2011-ZH PDF) 其它名稱:296-25628-2 |
| LT3479EDE#PBF | 制造商:Linear Technology 功能描述:DC-DC CONVERTER CURRENT MODE 制造商:Linear Technology 功能描述:DC-DC CONVERTER, CURRENT MODE, 3.5MHZ, D |
| LT3479EDE#TRPBF | 功能描述:IC REG BOOST INV ADJ 3A 14DFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關穩(wěn)壓器 系列:- 標準包裝:2,500 系列:- 類型:降壓（降壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:1.2V，1.5V，1.8V，2.5V 輸入電壓:2.7 V ~ 20 V PWM 型:- 頻率 - 開關:- 電流 - 輸出:50mA 同步整流器:是 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:10-TFSOP，10-MSOP（0.118"，3.00mm 寬）裸露焊盤 包裝:帶卷 (TR) 供應商設備封裝:10-MSOP 裸露焊盤 |
| LT3479EDEPBF | 制造商:Linear Technology 功能描述:DC-DC Soft-Start&Inrush Protection DFN14 |
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