power-management-pmic

LM2576

Key datasheet specifications and the closest alternatives, ranked by parametric similarity and grounded in the manufacturer datasheet.

01 — Overview

This TI datasheet covers the LM2576 and LM2576HV series, 3-A step-down voltage regulators. It provides design guidance for high-efficiency switching power supplies requiring minimal external components. Key parameters include a 40V to 60V input range, 3A output current, 52kHz fixed frequency, and adjustable outputs from 1.23V to 37V. The document details electrical characteristics, thermal performance, and layout recommendations for applications like motor drives and server PSUs.

02 — Key specifications

Datasheet parameters

ParameterMinTypMaxConditions
quiescent current — 5 mA 10 mA
output voltage 3.23 V 3.3 V 3.37 V VIN = 12 V, ILOAD = 0.5 ACircuit of Figure 8-3 and Figure 8-9
output current — 3 A —
supply voltage range — — 40 V LM2576
switching frequency — 52 kHz —
operating temperature -40 °C — 125 °C
input bias current 500 nA — — VOUT = 5 V (Adjustable Version Only); Applies over full operating temperature range
standby current — 50 µA —
dropout voltage — 1.4 V —
output count — 1 —
03 — Alternatives

Closest matches to LM2576

L78L05ABD13TR 1.5× higher output voltage, 1.4× higher dropout voltage, 1.3× lower supply voltage range
AZ1117C-3.3 3.0× lower output current, 2.7× lower supply voltage range, 1.2× lower quiescent current
L78M05ABV 6.0× lower output current, 3.0× lower supply voltage range, 1.5× higher output voltage
AZ1117D-3.3TRE1 3.0× lower output current, 2.7× lower supply voltage range, 1.2× lower dropout voltage
UC2845B 16.0× lower supply voltage range, 6.0× higher standby current, 2.9× higher switching frequency
UC3843BN 6.0× higher standby current, 4.0× lower supply voltage range, 2.9× higher switching frequency
UC3844BD1013TR 6.0× higher standby current, 4.0× lower supply voltage range, 2.9× higher switching frequency
AMS1117 4.3× lower supply voltage range, 3.0× lower output current, 1.3× lower dropout voltage
04 — FAQ

Frequently asked questions

What is the dropout voltage of the LM2576?

The dropout voltage is 1.4 V.

What is the input bias current for the LM2576?

The input bias current is 500 nA at VOUT = 5 V (Adjustable Version Only) and applies over the full operating temperature range.

What is the maximum operating temperature for the LM2576?

The maximum operating temperature is 125 °C.

How many outputs does the LM2576 have?

The LM2576 has 1 output.

What is the maximum output current of the LM2576?

The maximum output current is 3 A.

What is the output voltage when VIN = 12 V, ILOAD = 0.5 A, and the circuit follows Figure 8-3 and Figure 8-9?

The output voltage is 3.3 V.

What is the quiescent current of the LM2576?

The quiescent current is 5 mA.

What is the standby current of the LM2576?

The standby current is 50 µA.

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