Position: Home > DataSheet > Index L > L49 Series > L4991, L4991TM1, L4992
Low Cost Custom Prototype PCB Manufacturer

L4991, L4991TM1, L4992

L4991, L4991TM1, L4992 Selling Leads, Datasheet

MFG:NS  Package Cooled:QFN-8  D/C:NSC

L4991, L4991TM1, L4992 Picture

L4991, L4991TM1, L4992 Datasheet download

Five Points

Part Number: L4991

 

MFG: NS

Package Cooled: QFN-8

D/C: NSC

 

 

 
 
 
Urgent Purchase
Attentive hint

Want to post a buying lead? If you are not a member yet, please select the specific/related part number first and then fill the quantity and your contact details in the "Request for Quotation Form" on the left, and then click "Send RFQ".Your buying lead can then be posted, and the reliable suppliers will quote via our online message system or other channels soon.


Top Sellers:

TOP

L4991 Suppliers

More L4991 Suppliers

Select All  

  • L4901A

  • Vendor: ST Pack: TO D/C: 94+& Qty: 472  Adddate: 2024-03-29
  • Inquire Now
  • YOUWEI ELECTRONICS CO., Ltd   China
    Contact: Mr.JACKHU   MSN:youweidz@hotmail.com
    Tel: 86-0755-33062827
    Fax: 86-0755-33062897
    (1)
  • L4901A

  • Vendor: ST Pack: TO D/C: 05+& Qty: 1000 Note: 2C006  Adddate: 2024-03-29
  • Inquire Now
  • Kejin Electronics(HK) Limited   China
    Contact: Ms.JoyLin   MSN:joylin-kejinic@hotmail.com
    Tel: 86-755-83997989
    Fax: 86-755-83282993
    (5)
  • L4901A

  • Vendor: ST D/C: 00+&   Adddate: 2024-03-29
  • Inquire Now
  • orientelec   China
    Contact: Ms.Jessica Ren   MSN:jessica@orientelec.cn
    Tel: 86-10-62103873/62101821
    Fax: 86-10-62102720
    (5)
  • L4901A

  • Vendor: ST Qty: 781 Note: New,unused in stock and at lower price in perfect quality!!!  Adddate: 2024-03-29
  • Inquire Now
  • Beijing huadong shiji teconolgy Co.,Lt   China
    Contact: Mr.zimingjiang   MSN:hddz-006@hotmail.com
    Tel: 86-010-62575888 805
    Fax: 86-010-62575899
    (5)
  • L4904

  • Vendor: ST Pack: DIP D/C: 01+& Qty: 590 Note: 2C006  Adddate: 2024-03-29
  • Inquire Now
  • Kejin Electronics(HK) Limited   China
    Contact: Ms.JoyLin   MSN:joylin-kejinic@hotmail.com
    Tel: 86-755-83997989
    Fax: 86-755-83282993
    (5)
  • L4904A

  • Vendor: ST Pack: DIP D/C: 05+& Qty: 600 Note: 2C006  Adddate: 2024-03-29
  • Inquire Now
  • Kejin Electronics(HK) Limited   China
    Contact: Ms.JoyLin   MSN:joylin-kejinic@hotmail.com
    Tel: 86-755-83997989
    Fax: 86-755-83282993
    (5)

About L4901

PDF/DataSheet Download

Datasheet: L4901

File Size: 137029 KB

Manufacturer: STMICROELECTRONICS [STMicroelectronics]

Download : Click here to Download

Related PDF Download

Related Part Number

L4991TM1 Suppliers

More L4991TM1 Suppliers

Select All  

  • L4901A

  • Vendor: ST Pack: TO D/C: 94+& Qty: 472  Adddate: 2024-03-29
  • Inquire Now
  • YOUWEI ELECTRONICS CO., Ltd   China
    Contact: Mr.JACKHU   MSN:youweidz@hotmail.com
    Tel: 86-0755-33062827
    Fax: 86-0755-33062897
    (1)
  • L4901A

  • Vendor: ST Pack: TO D/C: 05+& Qty: 1000 Note: 2C006  Adddate: 2024-03-29
  • Inquire Now
  • Kejin Electronics(HK) Limited   China
    Contact: Ms.JoyLin   MSN:joylin-kejinic@hotmail.com
    Tel: 86-755-83997989
    Fax: 86-755-83282993
    (5)
  • L4901A

  • Vendor: ST D/C: 00+&   Adddate: 2024-03-29
  • Inquire Now
  • orientelec   China
    Contact: Ms.Jessica Ren   MSN:jessica@orientelec.cn
    Tel: 86-10-62103873/62101821
    Fax: 86-10-62102720
    (5)
  • L4901A

  • Vendor: ST Qty: 781 Note: New,unused in stock and at lower price in perfect quality!!!  Adddate: 2024-03-29
  • Inquire Now
  • Beijing huadong shiji teconolgy Co.,Lt   China
    Contact: Mr.zimingjiang   MSN:hddz-006@hotmail.com
    Tel: 86-010-62575888 805
    Fax: 86-010-62575899
    (5)
  • L4904

  • Vendor: ST Pack: DIP D/C: 01+& Qty: 590 Note: 2C006  Adddate: 2024-03-29
  • Inquire Now
  • Kejin Electronics(HK) Limited   China
    Contact: Ms.JoyLin   MSN:joylin-kejinic@hotmail.com
    Tel: 86-755-83997989
    Fax: 86-755-83282993
    (5)
  • L4904A

  • Vendor: ST Pack: DIP D/C: 05+& Qty: 600 Note: 2C006  Adddate: 2024-03-29
  • Inquire Now
  • Kejin Electronics(HK) Limited   China
    Contact: Ms.JoyLin   MSN:joylin-kejinic@hotmail.com
    Tel: 86-755-83997989
    Fax: 86-755-83282993
    (5)

About L4901

PDF/DataSheet Download

Datasheet: L4901

File Size: 137029 KB

Manufacturer: STMICROELECTRONICS [STMicroelectronics]

Download : Click here to Download

Related PDF Download

Related Part Number

L4992 Suppliers

More L4992 Suppliers

Select All  

  • L4992

  • D/C: 99+& Qty: 58  Adddate: 2024-03-29
  • Inquire Now
  • Moko Technology Limited   China
    Contact: Mr.Tom   MSN:tom-ic@hotmail.com
    Tel: 0086-0755-23956700
    Fax: 0086-0755-23956710
    (22)
  • L4992

  • Vendor: ST Pack: QFP Qty: 1550 Note: stock on hand  Adddate: 2024-03-29
  • Inquire Now
  • TCW(HK) electronic limited   China
    Contact: Mr.David   MSN:hongjijia@hotmail.com
    Tel: 86-0755-82817106
    Fax: 86-0755-83012739
    (3)
  • L4992

  • Vendor: ST Pack: QFP Qty: 320 Note: IN STOCK  Adddate: 2024-03-29
  • Inquire Now
  • Trustful International Co.,Ltd   China
    Contact: Ms.MiggieLo   MSN:sale@hktrustful.com
    Tel: 86-755-3306-2583
    Fax: 86-755-3306-2583
    (0)
  • L4901A

  • Vendor: ST Pack: TO D/C: 94+& Qty: 472  Adddate: 2024-03-29
  • Inquire Now
  • YOUWEI ELECTRONICS CO., Ltd   China
    Contact: Mr.JACKHU   MSN:youweidz@hotmail.com
    Tel: 86-0755-33062827
    Fax: 86-0755-33062897
    (1)
  • L4901A

  • Vendor: ST Pack: TO D/C: 05+& Qty: 1000 Note: 2C006  Adddate: 2024-03-29
  • Inquire Now
  • Kejin Electronics(HK) Limited   China
    Contact: Ms.JoyLin   MSN:joylin-kejinic@hotmail.com
    Tel: 86-755-83997989
    Fax: 86-755-83282993
    (5)

About L4992

PDF/DataSheet Download

Datasheet: L4992

File Size: 315649 KB

Manufacturer: STMicro

Download : Click here to Download

Related PDF Download

Related Part Number

L4992 General Description

The L4992 is a sophisticated dual PWM stepdown controller and power monitor intended for Notebook computer and/or battery powered equipment. The device produces regulated +3.3V, +5.1V and 12V supplies for use in portable and PCMCIA applications.

The internal architecture allows to operate with minimum external components count. A very high switching frequency (200/300 KHz or externally synchronizable) optimizes their physical dimensions.

Synchronous rectification and pulse skipping mode for the buck sections optimise the overall efficiency over a wide load current range (96% efficiency @1A/5.1V and 93% efficiency @ 0.05A/5.1V.

The two high performance PWM controllers for +3.3V and +5.1V lines are monitored for overvoltage, undervoltage and overcurrent conditions. On detection of a fault, a POWER GOOD signal is generated and a specific shutdown procedure takes place to prevent physical damage and data corruption.

A disable function allows to manage the output power sections separately, optimising the quiescent consumption of the IC in stand-by conditions.

L4992 Maximum Ratings

Symbol Parameter
Value
Unit
VIN Power Supply Voltage on VIN
0 to 25
V
VI Maximum Pin Voltage to Pins 1, 24, 25, 32
-0.5 to (VIN +5)
V
IIN Input Current Except V13IN and VIN
-1 to +1
mA
IOUT Output Current Digital Output
-15 to +15
mA
TJ junction temperature
-55 to +150

L4992 Features

`DUAL PWM BUCK CONTROLLERS (3.3V and 5.1V)
`12V/120mA LINEAR REGULATOR
`DUAL SYNCH RECTIFIERS DRIVERS
`96% EFFICIENCY ACHIEVABLE
`50A (@ 12V) STAND BY CONSUMPTION
`5.5V TO 25V SUPPLY VOLTAGE
`EXCELLENT LOAD TRANSIENT RESPONSE
`DISABLE PULSE SKIPPING FUNCTION
`POWER MANAGEMENT:
   - UNDER AND OVERVOLTAGE OUTPUT DETECTION
   - POWER GOOD SIGNAL
   - SEPARATED DISABLE
`THERMAL SHUTDOWN
`PACKAGE: TQFP32

L4992 Typical Application

·NOTEBOOK AND SUBNOTEBOOK COMPUTERS
·PEN TOP AND PORTABLE EQUIPMENT
·COMMUNICATING COMPUTERS

L4992 Connection Diagram

Hotspot Suppliers Product

  • Models: MT58L64L18CT-10
Price: 4-6 USD

    MT58L64L18CT-10

    Price: 4-6 USD

    MT58L64L18CT-10 TQFP100

  • Models: DL-7140-211M
Price: 5-6.5 USD

    DL-7140-211M

    Price: 5-6.5 USD

    DL-7140-211M laser tube

  • Models: 74LVC74APG
Price: 4-5 USD

    74LVC74APG

    Price: 4-5 USD

    74LVC74APG - IC FLIP FLOP D-Type POS-EDG DUAL 14TSSOP

  • Models: CY28346ZI-2
Price: 6.5-8 USD

    CY28346ZI-2

    Price: 6.5-8 USD

    CYPRESS - Clock Synthesizer with Differential CPU Outputs

  • Models: PI5V330QEX
Price: .284-.286 USD

    PI5V330QEX

    Price: 0.284-0.286 USD

    PI5V330QEX Pericom Multiplexer Switch ICs

  • Models: BSM300GA120DN2
Price: 1-2 USD

    BSM300GA120DN2

    Price: 1-2 USD

    IGBT power module, Single switch, 1200 V, Collector-emitter voltage, 430A

  • Models: SVA150XG04TB
Price: 1-2 USD

    SVA150XG04TB

    Price: 1-2 USD

    a-Si TFT-LCD, NEC, 228.096Hmm, 560V

  • Models: PC354N1
Price: .124-.2 USD

    PC354N1

    Price: 0.124-0.2 USD

    PC354N1T - Mini-flat Package, AC Input Type Photocoupler - Sharp Electrionic Components

  • Models: RL1210JR-070R22L
Price: .177-.178 USD

    RL1210JR-070R22L

    Price: 0.177-0.178 USD

    RL1210JR51-XX-BL - Thick Film Chip Resistor Low Ohmic - TAITRON Components Incorporated

  • Models: STPS140A
Price: .053-.055 USD

    STPS140A

    Price: 0.053-0.055 USD

    STPS140A - POWER SCHOTTKY RECTIFIER - STMicroelectronics

  • Models: STA013
Price: 1.45-1.5 USD

    STA013

    Price: 1.45-1.5 USD

    STA013 - MPEG 2.5 LAYER III AUDIO DECODER - STMicroelectronics

  • Models: SMBJ5347B
Price: .073-.075 USD

    SMBJ5347B

    Price: 0.073-0.075 USD

    SMBJ5347B - 5 Watt Surface Mount Silicon Zener Diodes - Micro Commercial Components

Quick search:    ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789