參數(shù)資料
型號： LT1937
廠商： Linear Technology Corporation
英文描述： White LED Step-Up Converter in SC70 and ThinSOT
中文描述： 白光LED升壓型SC70和轉(zhuǎn)換器采用ThinSOT
文件頁數(shù)： 1/12頁
文件大?。?/td> 367K
代理商： LT1937
1
LT1937
1937f
White LED
Step-Up Converter in
SC70 and ThinSOT
, LTC and LT are registered trademarks of Linear Technology Corporation.
ThinSOT is a trademark of Linear Technology Corporation.
The LT
1937 is a step-up DC/DC converter specifically
designed to drive white LEDs with a constant current. The
device can drive two, three or four LEDs in series from a
Li-Ion cell. Series connection of the LEDs provides iden-
tical LED currents resulting in uniform brightness and
eliminating the need for ballast resistors. The LT1937
switches at 1.2MHz, allowing the use of tiny external
components. The output capacitor can be as small as
0.22
μ
F, saving space and cost versus alternative solu-
tions. A low 95mV feedback voltage minimizes power loss
in the current setting resistor for better efficiency.
The LT1937 is available in low profile SC70 and ThinSOT
packages.
I
Inherently Matched LED Current
I
High Efficiency: 84% Typical
I
Drives Up to Four LEDs from a 3.2V Supply
I
Drives Up to Six LEDs from a 5V Supply
I
36V Rugged Bipolar Switch
I
Fast 1.2MHz Switching Frequency
I
Uses Tiny 1mm Tall Inductors
I
Requires Only 0.22
μ
F Output Capacitor
I
Low Profile SC70 and ThinSOT
TM
Packaging
I
Cellular Phones
I
PDAs, Handheld Computers
I
Digital Cameras
I
MP3 Players
I
GPS Receivers
LED CURRENT (mA)
0
60
E
65
70
75
80
85
90
V
IN
= 3V
5
10
15
20
1937 TA01b
V
IN
= 3.6V
Figure 1. Li-Ion Powered Driver for Three White LEDs
Conversion Efficiency
V
IN
SW
LT1937
L1
22
μ
H
C1
1
μ
F
C2
0.22
μ
F
15mA
1937 F01a
V
IN
3V TO 5V
OFF ON
SHDN
R1
6.34
C1, C2: X5R OR X7R DIELECTRIC
D1: CENTRAL SEMICONDUCTOR CMDSH-3
L1: MURATA LQH3C-220 OR EQUIVALENT
FB
LED 3
LED 2
LED 1
D1
GND
FEATURES
DESCRIPTIOU
APPLICATIU
TYPICAL APPLICATIO
U
相關(guān)PDF資料
PDF描述
LT1937ES5 White LED Step-Up Converter in SC70 and ThinSOT
LT1937ESC6 White LED Step-Up Converter in SC70 and ThinSOT
LT1946A 2.7MHz Boost DC/DC Converter with 1.5A Switch and Soft-Start
LT1946AEMS8E 2.7MHz Boost DC/DC Converter with 1.5A Switch and Soft-Start
LT1946 1.2MHz Boost DC/DC Converter with 1.5A Switch and Soft-Start
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LT1937ES5 制造商:Linear Technology 功能描述:LED DRVR 6Segment 3.3V/5V/9V 5-Pin TSOT-23
LT1937ES5#PBF 制造商:Linear Technology 功能描述:LED DRIVER BOOST PWM 1.2MHZ 制造商:Linear Technology 功能描述:LED DRIVER, BOOST, PWM, 1.2MHZ, TSOT-23-5; Topology:Boost (Step Up); No. of Outputs:1; Output Voltage:36V; Driver Case Style:TSOT-23; Input Voltage Min:2.5V; Input Voltage Max:10V; Dimming Control Type:PWM; Switching Frequency:1.2MHz;RoHS Compliant: Yes
LT1937ES5#TR 功能描述:IC LED DRIVR WHITE BCKLGT TSOT-5 RoHS:否 類別:集成電路 (IC) >> PMIC - LED 驅(qū)動器 系列:- 標準包裝:6,000 系列:- 恒定電流:- 恒定電壓:- 拓撲:開路漏極，PWM 輸出數(shù):4 內(nèi)部驅(qū)動器:是 類型 - 主要:LED 閃爍器 類型 - 次要:- 頻率:400kHz 電源電壓:2.3 V ~ 5.5 V 輸出電壓:- 安裝類型:表面貼裝 封裝/外殼:8-VFDFN 裸露焊盤 供應(yīng)商設(shè)備封裝:8-HVSON 包裝:帶卷 (TR) 工作溫度:-40°C ~ 85°C 其它名稱:935286881118PCA9553TK/02-TPCA9553TK/02-T-ND
LT1937ES5#TRM 功能描述:IC LED DRIVR WHITE BCKLGT TSOT-5 RoHS:否 類別:集成電路 (IC) >> PMIC - LED 驅(qū)動器 系列:- 標準包裝:1 系列:- 恒定電流:- 恒定電壓:- 拓撲:PWM，切換式電容器（充電泵） 輸出數(shù):1 內(nèi)部驅(qū)動器:是 類型 - 主要:背光 類型 - 次要:白色 LED 頻率:642kHz 電源電壓:2.7 V ~ 5.5 V 輸出電壓:5V 安裝類型:表面貼裝 封裝/外殼:10-VFDFN 裸露焊盤 供應(yīng)商設(shè)備封裝:10-VSON 包裝:剪切帶 (CT) 工作溫度:-30°C ~ 85°C 產(chǎn)品目錄頁面:1371 (CN2011-ZH PDF) 其它名稱:BD1603NUV-E2CT
LT1937ES5#TRMPBF 功能描述:IC LED DRIVR WHITE BCKLGT TSOT-5 RoHS:是 類別:集成電路 (IC) >> PMIC - LED 驅(qū)動器 系列:- 標準包裝:60 系列:- 恒定電流:- 恒定電壓:- 拓撲:線性（LDO），PWM，升壓（升壓） 輸出數(shù):8 內(nèi)部驅(qū)動器:是 類型 - 主要:背光 類型 - 次要:RGB，白色 LED 頻率:500kHz ~ 1.5MHz 電源電壓:4.75 V ~ 26 V 輸出電壓:45V 安裝類型:* 封裝/外殼:* 供應(yīng)商設(shè)備封裝:* 包裝:* 工作溫度:-40°C ~ 85°C
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