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LM2676

Features: .Efficiency up to 94%. Simple and easy to design with (using off-the-shelf external components).150 m? DMOS output switch.3.3V, 5V and 12V fixed output and adjustable (1.2V to 37V ) versions.50A standby current when switched OFF.±2%maximum output tolerance over full line and load conditi...

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SeekIC No. : 004394974 Detail

LM2676: Features: .Efficiency up to 94%. Simple and easy to design with (using off-the-shelf external components).150 m? DMOS output switch.3.3V, 5V and 12V fixed output and adjustable (1.2V to 37V ) versio...

LM2676 Data Sheet

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Part Number:
LM2676
Supply Ability:
5000

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  • Qty
  • 1~5000
  • Unit Price
  • Negotiable
  • Processing time
  • 15 Days
Total Cost: $ 0.00

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Product Details

Description



Features:

. Efficiency up to 94%
. Simple and easy to design with (using off-the-shelf external components)
. 150 m? DMOS output switch
. 3.3V, 5V and 12V fixed output and adjustable (1.2V to 37V ) versions
. 50A standby current when switched OFF
. ±2%maximum output tolerance over full line and load conditions
. Wide input voltage range: 8V to 40V
. 260 KHz fixed frequency internal oscillator
. -40 to +125?C operating junction temperature range


Application

. Simple to design, high efficiency (>90%) step-down switching regulators
. Efficient system pre-regulator for linear voltage regulators
. Battery chargers


Pinout

Connection Diagram


Specifications

If Military/Aerospace specified devices are required,
pleasecontacttheNationalSemiconductorSalesOffice/
Distributors for availability and specifications.
Input Supply Voltage                                          45V
ON/OFF Pin Voltage                                 -0.1V to 6V
Switch Voltage to Ground                         -1V to VIN
Boost Pin Voltage                                       VSW +8V
Feedback Pin Voltage                           -0.3V to 14V
Power Dissipation Internally Limited
ESD (Note 2)                                                     2 kV
Storage Temperature Range             -65 to 150
Soldering Temperature
Wave                                                     4 sec,260
Infrared                                               10 sec,240
Vapor Phase                                       75 sec, 219


Description

The LM2676 series of regulators are monolithic integrated circuits which provide all of the active functions for a step- down (buck) switching regulator capable of driving up to 3A loads with excellent line and load regulation characteristics. High efficiency (>90%) is obtained through the use of a low ON-resistance DMOS power switch. The series consists of fixed output voltages of 3.3V, 5V and 12V and an adjustable output version.

The SIMPLE SWITCHER concept provides for a complete design using a minimum number of external components. A high fixed frequency oscillator (260KHz) allows the use of physically smaller sized components. A family of standard inductors for use with the LM2676 are available from several manufacturers to greatly simplify the design process.

The LM2676 series also has built in thermal shutdown, current limiting and an ON/OFF control input that can power down the regulator to a low 50A quiescent current standby condition. The output voltage is guaranteed to a ±2% toler- ance. The clock frequency is controlled to within a ±11% tolerance.




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