LM2599S-12 판매점 - SIMPLE SWITCHER Power Converter 150 kHz 3A Step-Down Voltage Regulator/ with Features

LM2599S-12 반도체 회로 부품 판매점

SIMPLE SWITCHER Power Converter 150 kHz 3A Step-Down Voltage Regulator/ with Features

National Semiconductor

April 1998

LM2599

SIMPLE SWITCHER® Power Converter 150 kHz 3A

Step-Down Voltage Regulator, with Features

General Description

The LM2599 series of regulators are monolithic integrated

circuits that provide all the active functions for a step-down

(buck) switching regulator, capable of driving a 3A load with

excellent line and load regulation. These devices are avail-

able in fixed output voltages of 3.3V, 5V, 12V, and an adjust-

able output version.

This series of switching regulators is similar to the LM2596

series, with additional supervisory and performance features

added.

Requiring a minimum number of external components, these

regulators are simple to use and include internal frequency

compensation†, improved line and load specifications,

fixed-frequency oscillator, Shutdown/Soft-start, error flag de-

lay and error flag output.

The LM2599 series operates at a switching frequency of 150

kHz thus allowing smaller sized filter components than what

would be needed with lower frequency switching regulators.

Available in a standard 7-lead TO-220 package with several

different lead bend options, and a 7-lead TO-263 Surface

mount package.

A standard series of inductors (both through hole and sur-

face mount types) are available from several different manu-

facturers optimized for use with the LM2599 series. This fea-

ture greatly simplifies the design of switch-mode power

supplies.

Other features include a guaranteed ±4% tolerance on out-

put voltage under all conditions of input voltage and output

load conditions, and ±15% on the oscillator frequency. Ex-

ternal shutdown is included, featuring typically 80 µA

standby current. Self protection features include a two stage

current limit for the output switch and an over temperature

shutdown for complete protection under fault conditions.

Features

n 3.3V, 5V, 12V, and adjustable output versions

n Adjustable version output voltage range, 1.2V to 37V

±4% max over line and load conditions

n Guaranteed 3A output current

n Available in 7-pin TO-220 and TO-263 (surface mount)

Package

n Input voltage range up to 40V

n 150 kHz fixed frequency internal oscillator

n Shutdown/Soft-start

n Out of regulation error flag

n Error output delay

n Low power standby mode, IQ typically 80 µA

n High Efficiency

n Uses readily available standard inductors

n Thermal shutdown and current limit protection

Applications

n Simple high-efficiency step-down (buck) regulator

n Efficient pre-regulator for linear regulators

n On-card switching regulators

n Positive to Negative converter

Note: † Patent Number 5,382,918.

Typical Application (Fixed Output Voltage Versions)

SIMPLE SWITCHER® and Switchers Made Simple® are registered trademarks of National Semiconductor Corporation.

DS012582-1

www.national.com

Absolute Maximum Ratings (Note 1)

If Military/Aerospace specified devices are required,

please contact the National Semiconductor Sales Office/

Distributors for availability and specifications.

Maximum Supply Voltage (VIN)

SD /SS Pin Input Voltage (Note 2)

Delay Pin Voltage (Note 2)

Flag Pin Voltage

Feedback Pin Voltage

Output Voltage to Ground

(Steady State)

Power Dissipation

Storage Temperature Range

45V

1.5V

−0.3 ≤ V ≤45V

−0.3 ≤ V ≤+25V

−1V

Internally limited

−65˚C to +150˚C

ESD Susceptibility

Human Body Model (Note 3)

Lead Temperature

S Package

Vapor Phase (60 sec.)

Infrared (10 sec.)

T Package (Soldering, 10 sec.)

Maximum Junction Temperature

2 kV

+215˚C

+245˚C

+260˚C

+150˚C

Operating Conditions

Temperature Range

Supply Voltage

−40˚C ≤ TJ ≤ +125˚C

4.5V to 40V

LM2599-3.3

Electrical Characteristics

Specifications with standard type face are for TJ = 25˚C, and those with boldface type apply over full Operating Tempera-

ture Range.

Symbol

Parameter

Conditions

LM2599-3.3

Typ Limit

Units

(Limits)

(Note 4)

(Note 5)

SYSTEM PARAMETERS (Note 6) Test Circuit Figure 1

VOUT

Output Voltage

4.75V ≤ VIN ≤ 40V, 0.2A ≤ ILOAD ≤ 3A

3.3 V

3.168/3.135

V(min)

3.432/3.465

V(max)

η Efficiency

VIN = 12V, ILOAD = 3A

LM2599-5.0