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LT1121CS8
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Technical/Catalog InformationLT1121CS8
VendorLinear Technology
CategoryIntegrated Circuits (ICs)
Regulator TypeSingle Output
Package / Case8-SOIC (3.9mm Width)
PackagingTube
Regulator TopologyPositive Adjustable
Current - Output150mA
Voltage - Output3.75 ~ 30 V
Operating Temperature0°C ~ 125°C
Voltage - Input4.17 ~ 36 V
Number of Regulators1
Current - Limit (Min)200mA
Current Short Circuit (Isc)-
Drawing Number161; 05-08-1610; S; 8
Lead Free StatusContains Lead
RoHS StatusRoHS Non-Compliant
Other Names LT1121CS8
LT1121CS8

Product Manufacturers Pack D/C
LT1121CS8 - - -

Pinout/Connection Diagram

lt1121cs8 Circuit
Constant-current Sources are required in many applications,particularly when it comes to battery charging in such applications,it is desirable that the output current be accurate,temperaturestable,and adjustable The controller also can be successfully employed as the control element in a low-cost linear current source.Output current is sensed by resistor R1,with the value selected so that 100 mV is full-scale The voltage across R1 is amplified by a factor of 10 and averaged across capacitor C4.AN internal transconductance error amplifier compares the voltage on pin 8 against the programming voltage at pin 7.The error-amplifier outputis present on pin 2 (Iout),and is level-shiftedby Q2 to control the PNP pass transistor Output current is programmed by adjusting the voltage across R5 (1 V full-scale).The LT1121 LDO regulator provides a 5-V,±1.5 percent reference voltage so that current can be accurately programmed by simply connecting different values for Rprog. The input voltage can range from +6 to +28 V, with output current changing less than 0.3 percent Properheat sinking must be provided for Q1, especially when operating with large input-to-output voltage differentials.Transistor Q3 and R4 limit the magnitude of Q1's base drive during dropout,preventing excessive dissipation in driver transistor Q2 using voltage regulator IC2, the constant-currentSource operates directly from the unregulated input voltage. Pulling IC2's shutdown ptn lowturns off VCC to the entire circuit,and limits the reverse current drawn from the output to less than 25μA.

Supplier

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  Part Number Mfg Pack D/C Qty Note
LT1121CS8 LT SOP 99+ 909 new part
  LATTICE INTERNATIONAL TRADING CO,.LTD China (Mainland)
Contact: Mr. Chan   MSN:lattice-ic@hotmail.com Tel: 86-755-83237896 Fax: 86-755-61309212
LT1121CS8 LT SOP 17440 Professional IC Supplier in China
  RANTLE EAST ELECTRONIC TRADING CO China (Mainland)
Contact: Ms. Jessica Wong   MSN:rantle-east@hotmail.com Tel: 86-754-84475086 Fax: 86-754-84471197
LT1121CS8 LINEAR 8/SO 2000 86
  ASC (HK) Electronic Co., Limited， China (Mainland)
Contact: Ms. shanna wei   MSN:shanna_wei@hotmail.com Tel: 0086-755-61570263, 61570276 Fax: 0086-755-61570263
LT1121CS8 LINEAR SOP 98+ 9
  E-core Electronics Co. China (Mainland)
Contact: Mr. Eric   MSN:ecore-ic@hotmail.com Tel: +86-754-89970968 Fax: +86-754-89970567
LT1121CS8 LINEAR SMD 400
  AIBOSI ELECTRONIC (HK) CO., LIMITED China (Mainland)
Contact: Ms. liuhongyun   MSN:aibosi02@hotmail.com Tel: +86-755-23806752 Fax: +86-755-82719183
LT1121CS8 'LT SOP 08+ 300
  Goldenway Electronic Limited Company Hong Kong
Contact: Ms. sarah   Tel: 0086-755-82535329 Fax: 0086-755-
LT1121CS8 LT SO 30
  3E-ELEC(HK)Co. Ltd China (Mainland)
Contact: Ms. Selina Zhang   MSN:3e06@3e-elec.com Tel: 86-755-33063502 Fax: 86-755-33063509
LT1121CS8 LT SOP 04+ 10000
  Zhengxinyuan ELectronics(HongKong)Co.LTD  China (Mainland)
Contact: Ms. Marco yuan   MSN:marco@zxy-ic.com Tel: 086-0755-88822655 Fax: 086-0755-88860655
LT1121CS8 SOP/8 LT 93+ 201
  OneNew(HK)Electronics Co.,Ltd China (Mainland)
Contact: Mr. Bill   MSN:bill12124@gmail.com Tel: 86-0755-83987701 Fax: 86-0755-83987726
LT1121CS8 SOP 2011+ LT 2500
  HK Chuanghua Electronic Company Hong Kong
Contact: Ms. Nice Lu   MSN:nice19881@live.cn Tel: 00852-97966836-86-0755-83423012 Fax: 00852-97966836-86-15017966836
LT1121CS8 LT SOP O4 72
  Yike Electronics (HK) Co.,Ltd China (Mainland)
Contact: Mr. Zhao   MSN:zhaojunjack@hotmail.com Tel: 86--15017908912 Fax: 86-755-82533178
LT1121CS8 LINEAR 05+ 26 RFQ,CALL FOR PRICE
  Grand Parts Electronics Corporation China (Mainland)
Contact: Ms. Anna   Tel: 86-755-8281-4478 Fax: 86-755-8281-4458
LT1121CS8 LT SOP 10+ 12000 HOT & New and Origina
  HHS Technology Co.,Ltd China (Mainland)
Contact: Ms. Jane Zhang   MSN:cheerjane@hotmail.com Tel: 86-755-83970132 Fax: 86-755-83953764
LT1121CS8 LT/98 SO 98 1241
  Hong Kong Ssit Electronics Co., Limited China (Mainland)
Contact: Mr. Lian   MSN:sales@ssit-ic.com Tel: +86-755-89335285 Fax: +86-755-89579939
LT1121CS8 LINEAR 58806 SOIC8
  BST INT'L ELECTRONIC(HK) CO., LIMITED Hong Kong
Contact: Ms. Tina   MSN:tina-bst@live.cn Tel: 00-852-30504229 Fax: 00-852-30691955
LT1121CS8 LT SOP N/A 100
  Aslan Internatinal Trade Co., Limited China (Mainland)
Contact: Mr. David King   MSN:Aslan0908@live.com Tel: 86-754-84439661 Fax: 86-754-84439661
LT1121CS8 LT SOP 08+ 201 instock,advantage price,good quality,
  Big Seashell Electronic Co. China (Mainland)
Contact: Mr. Jayco   MSN:jayco.bigseashell@hotmail.com Tel: +86-189-2479-1245 Fax: +86-755-8253-6827
LT1121CS8 LT 792
  E-Sailing Electronic Tech Co.,Ltd. China (Mainland)
Contact: Ms. Lee   MSN:e-sailing@hotmail.com Tel: 86-755-83669519 Fax: 86-755-83669519
LT1121CS8 lt SOP dc9909 1279
  HK Ekenda Electronic Industrial Co.,Ltd China (Mainland)
Contact: Ms. Wendy   MSN:ekendasales2@hotmail.com Tel: 86-755-89487322 Fax: 86-755-28198533
LT1121CS8 LT 10+ 8000
  Beford Enterprises Ltd China (Mainland)
Contact: Ms. Sea   MSN:Beford17@hotmail.com Tel: 86-0755-83228351 Fax: 86-0755-23486252
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PDF / Datasheet

LT1121CS8 PDF Download

LT1121CS8

File Size: 161258 KB
Manufacturer: Linear

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