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LM2675N-ADJ/NOPB

SIMPLE SWITCHER® 6.5V to 40V, 1A Low Component Count Step-Down Regulator

Manufacturer:

TI
Mfr.Part #:

LM2675N-ADJ/NOPB
Datasheet:

LM2675N-ADJ/NOPB Datasheet (PDF)
Vin (min) (V):

6.5
Vin (max) (V):

40
Vout (min) (V):

1.23
Vout (max) (V):

37
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LM2675N-ADJ/NOPB General Description

The LM2675 series of regulators are monolithic integrated DC-DC converter circuits built with a LMDMOS process. These regulators provide all the active functions for a step-down (buck) switching regulator, capable of driving a 1-A load current with excellent line and load regulation. These devices are available in fixed output voltages of 3.3 V, 5 V, 12 V, and an adjustable output version.

Requiring a minimum number of external components, these regulators are simple to use and include patented internal frequency compensation and a fixed frequency oscillator.

The LM2675 series operates at a switching frequency of 260 kHz, thus allowing smaller-sized filter components than what would be needed with lower frequency switching regulators. Because of its very high efficiency (>90%), the copper traces on the printed-circuit board are the only heat sinking needed.

A family of standard inductors for use with the LM2675 are available from several different manufacturers. This feature greatly simplifies the design of switch-mode power supplies using these advanced ICs. Also included in the data sheet are selector guides for diodes and capacitors designed to work in switch-mode power supplies.

Other features include ±1.5%-tolerance on output voltage within specified input voltages and output load conditions, and ±10% on the oscillator frequency. External shutdown is included, featuring typically 50-µA standby current. The output switch includes current limiting, as well as thermal shutdown for full protection under fault conditions.

Key Features

Efficiency up to 96%
Available in 8-Pin SOIC, PDIP, and 16-Pin WSON
Package
Requires only 5 External Components
3.3-V, 5-V, 12-V, and Adjustable Output Versions
Adjustable Version Output Voltage Range: 1.21 V
to 37 V
±1.5% Maximum Output Voltage Tolerance Over
Line and Load Conditions
Ensured 1-A Output Load Current
Wide Input Voltage Range: 8 V to 40 V
260-kHz Fixed Frequency Internal Oscillator
TTL Shutdown Capability, Low-Power Standby
Mode
Thermal Shutdown and Current Limit Protection

Specifications

Vin (min) (V)	6.5	Vin (max) (V)	40
Vout (min) (V)	1.23	Vout (max) (V)	37
Iout (max) (A)	1	Iq (typ) (mA)	2.5
Switching frequency (min) (kHz)	260	Switching frequency (max) (kHz)	260
Features	Enable, Over Current Protection	Operating temperature range (°C)	-40 to 125
Rating	Catalog	Regulated outputs (#)	1
Control mode	Voltage mode	Duty cycle (max) (%)	95
Type	Converter