LM2596SX

Part: LM2596 — Texas Instruments

Type: Step-Down Voltage Regulator

Description: 150-kHz 3-A step-down switching regulator capable of driving a 3-A load with fixed output voltages of 3.3 V, 5 V, 12 V, or an adjustable output from 1.2 V to 37 V.

Operating Conditions:

• Supply voltage: 4.5–40 V
• Operating temperature: -40 to 125 °C

Absolute Maximum Ratings:

• Max junction temperature: 150 °C

Features:

• 3.3-V, 5-V, 12-V, and adjustable output versions
• Adjustable version output voltage range: 1.2-V to 37-V ±4% maximum over line and load conditions
• 3-A output load current
• Input voltage range up to 40 V
• 150-kHz fixed-frequency internal oscillator
• TTL shutdown capability
• Low power standby mode, IQ, typically 80 μA
• Thermal shutdown and current-limit protection

Applications:

• Appliances
• Grid infrastructure
• EPOS
• Home theater

Package:

• NDH (TO-220, 5)
• KTT (TO-263, 5)

• New product available:
• -LMR51430 4.5 to 36-V, 3-A, 500-kHz and 1.1MHz 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, and adjustable output versions
• Adjustable version output voltage range: 1.2-V to 37-V ±4% maximum over line and load conditions
• Available in TO-220 and TO-263 packages
• 3-A output load current
• Input voltage range up to 40 V
• Requires only four external components
• Excellent line and load regulation specifications
• 150-kHz fixed-frequency internal oscillator
• TTL shutdown capability
• Low power standby mode, IQ, typically 80 μA
• High efficiency
• Uses readily available standard inductors
• Thermal shutdown and current-limit protection
• Create a custom design using the LM2596 with the WEBENCH ® Power Designer

• Appliances
• Grid infrastructure
• EPOS
• Home theater

(Fixed Output Voltage Versions)

Figure 6-2. 5-Pin TO-263 KTT Package Top View

Figure 6-1. 5-Pin TO-220 NDH Package Top View

Table 6-1. Pin Functions

Table 6-1. Pin Functions

Specifications are for TJ = 25°C (unless otherwise noted)

over operating free-air temperature range (unless otherwise noted) (1) (2)

• (1) Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, which do not imply functional operation of the device at these or any other conditions beyond those indicated under Recommended Operating Conditions . Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
• (2) If Military/Aerospace specified devices are required, please contact the Texas Instruments Sales Office/ Distributors for availability and specifications.
• (3) Voltage internally clamped. If clamp voltage is exceeded, limit current to a maximum of 1 mA.

• (1) For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application report.
• (2) The package thermal impedance is calculated in accordance to JESD 51-7.
• (3) Thermal Resistances were simulated on a 4-layer, JEDEC board.
• (4) Junction to ambient thermal resistance (no external heat sink) for the package mounted TO-220 package mounted vertically, with the leads soldered to a printed circuit board with (1 oz.) copper area of approximately 1 in 2 .
• (5) Junction to ambient thermal resistance with the TO-263 package tab soldered to a single sided printed circuit board with 0.5 in 2 of 1-oz copper area.

• (6) Junction to ambient thermal resistance with the TO-263 package tab soldered to a single sided printed circuit board with 2.5 in 2 of 1-oz copper area.
• (7) Junction to ambient thermal resistance with the TO-263 package tab soldered to a double sided printed circuit board with 3 in 2 of 1-oz copper area on the LM2596S side of the board, and approximately 16 in 2 of copper on the other side of the PCB.

• (1) For all available packages, see the orderable addendum at the end of the data sheet.

Typical Application

Typical Application