LM2676SX-5.0 SIMPLE SWITCHER High Efficiency 3A Step-Down Voltage Regulator

FEATURES

Efficiency Up to 94%

Simple and Easy to Design with (Using Off-The-Shelf External Components)

150 mΩ DMOS Output Switch

3.3V, 5V and 12V Fixed Output and Adjustable (1.2V to 37V) Versions

50μA 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 Oscillato

0 to +125°C Operating Junction Temperature Range

APPLICATIONS

Simple to Design, High Efficiency (>90%) Step- Down Switching Regulators

Efficient System Pre-Regulator for Linear

Voltage Regulators

Battery Chargers

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 Range 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 50μA quiescent current standby condition. The output voltage is ensured to a ±2% tolerance. The clock frequency is controlled to within a ±11% tolerance.

Typical Application

Absolute Maximum Ratings(1)(2)

Operating Ratings

Electrical Characteristics

LM2676-3.3 Limits appearing in bold type face apply over the entire junction temperature range of operation, −40°C to 125°C. Specifications appearing in normal type apply for TA = TJ = 25°C.

(1) Typical values are determined with TA = TJ = 25°C and represent the most likely norm. (2) All limits are ensured at room temperature (standard type face) and at temperature extremes (bold type face). All room temperature limits are 100% tested during production with TA = TJ = 25°C. All limits at temperature extremes are ensured via correlation using standard Quality Control (SQC) methods. All limits are used to calculate Average Outgoing Quality Level (AOQL).

LM2676-5.0

(1) Typical values are determined with TA = TJ = 25°C and represent the most likely norm. (2) All limits are ensured at room temperature (standard type face) and at temperature extremes (bold type face). All room temperature limits are 100% tested during production with TA = TJ = 25°C. All limits at temperature extremes are ensured via correlation using standard Quality Control (SQC) methods. All limits are used to calculate Average Outgoing Quality Level (AOQL).

LM2676-12

(1) Typical values are determined with TA = TJ = 25°C and represent the most likely norm. (2) All limits are ensured at room temperature (standard type face) and at temperature extremes (bold type face). All room temperature limits are 100% tested during production with TA = TJ = 25°C. All limits at temperature extremes are ensured via correlation using standard Quality Control (SQC) methods. All limits are used to calculate Average Outgoing Quality Level (AOQL).

LM2676-ADJ

(1) Typical values are determined with TA = TJ = 25°C and represent the most likely norm. (2) All limits are ensured at room temperature (standard type face) and at temperature extremes (bold type face). All room temperature limits are 100% tested during production with TA = TJ = 25°C. All limits at temperature extremes are ensured via correlation using standard Quality Control (SQC) methods. All limits are used to calculate Average Outgoing Quality Level (AOQL).

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