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LM2576SX-5.0/NOPB +BOM

40V, 3A Low Component Count Step-Down Regulator, LM2576SX-5.0/NOPB

Manufacturer:

Texas Instruments
Mfr.Part #:

LM2576SX-5.0/NOPB
Datasheet:

LM2576SX-5.0/NOPB Datasheet (PDF)
Vin (min) (V):

4
Vin (max) (V):

40
Vout (min) (V):

3.3
Vout (max) (V):

37
EDA/CAD Models:

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LM2576SX-5.0/NOPB General Description

The LM2576 series of regulators are monolithic integrated circuits that provide all the active functions for a step-down (buck) switching regulator, capable of driving 3-A load with excellent line and load regulation. These devices are available in fixed output voltages of 3.3 V, 5 V, 12 V, 15 V, and an adjustable output version.

Requiring a minimum number of external components, these regulators are simple to use and include fault protection and a fixed-frequency oscillator.

The LM2576 series offers a high-efficiency replacement for popular three-terminal linear regulators. It substantially reduces the size of the heat sink, and in some cases no heat sink is required.

A standard series of inductors optimized for use with the LM2576 are available from several different manufacturers. This feature greatly simplifies the design of switch-mode power supplies.

Other features include a ±4% tolerance on output voltage within specified input voltages and output load conditions, and ±10% on the oscillator frequency. External shutdown is included, featuring 50-µA (typical) standby current. The output switch includes cycle-by-cycle current limiting, as well as thermal shutdown for full protection under fault conditions.

The LM76003 requires very few external components and has a pinout designed for simple, optimum PCB layout for EMI and thermal performance. See the device comparison table to compare specs.

Key Features

Newer products available:
- LMR51430 4.5 to 36-V, 3-A, 500-kHz and 1.1-MHz synchronous converter
- LM76003 3.5 to 60-V, 3.5-A, 300-kHz to 2.2-MHz synchronous converter
For faster time to market:
- TLVM13630 3 to 36-V, 3-A, 200-kHz to 2.2-MHz power module
3.3-V, 5-V, 12-V, 15-V, and adjustable output versions
Adjustable version output voltage range,1.23 V to 37 V (57 V for HV version) ±4% maximum over line and load conditions
Specified 3-A output current
Wide input voltage range: 40 V Up to 60 V for HV version
Requires only four external components
52-kHz fixed-frequency internal oscillator
TTL-shutdown capability, low-power standby mode
High efficiency
Uses readily available standard inductors
Create a custom design using the LMR33630 or LM76003 with the WEBENCH Power Designer

Application

Simple High-Efficiency Step-Down (Buck) Regulator
Efficient Pre-Regulator for Linear Regulators
On-Card Switching Regulators
Positive to Negative Converter (Buck-Boost)
Negative Step-Up Converters
Power Supply for Battery Chargers

Specifications

Vin (min) (V)	4	Vin (max) (V)	40
Vout (min) (V)	3.3	Vout (max) (V)	37
Iout (max) (A)	3	Iq (typ) (mA)	5
Switching frequency (min) (kHz)	42	Switching frequency (max) (kHz)	63
Features	Enable, Over Current Protection	Operating temperature range (°C)	-40 to 125
Rating	Catalog	Regulated outputs (#)	1
Control mode	Voltage mode	Duty cycle (max) (%)	98
Type	Converter