LM2675 datasheet(5/30 Pages) TI

部件名	LM2675

功能描述	LM2675 SIMPLE SWITCHER짰 Power Converter High Efficiency 1A Step-Down Voltage Regulator

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制造商	TI [Texas Instruments]

网页	http://www.ti.com

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LM2675

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SNVS129E – MAY 2004 – REVISED JUNE 2005

All Output Voltage Versions Electrical Characteristics (continued)

Specifications with standard type face are for TJ = 25°C, and those with bold type face apply over full Operating

Temperature Range. Unless otherwise specified, VIN = 12V for the 3.3V, 5V, and Adjustable versions and VIN = 24V for the

12V version, and ILOAD = 100 mA.

Symbol

Parameters

Conditions

Typ

Min

Max

Units

IL

Output Leakage Current

VIN = 40V, ON/OFF Pin = 0V

1

25

μA

VSWITCH = 0V

VSWITCH = −1V, ON/OFF Pin = 0V

6

15

mA

RDS(ON)

Switch On-Resistance

ISWITCH = 1A

0.25

0.30/0.50

Ω

fO

Oscillator Frequency

Measured at Switch Pin

260

225

275

kHz

D

Maximum Duty Cycle

95

%

Minimum Duty Cycle

0

%

IBIAS

Feedback Bias

VFEEDBACK = 1.3V

85

nA

Current

ADJ Version Only

VS/D

ON/OFF Pin

1.4

0.8

2.0

V

Voltage Thesholds

IS/D

ON/OFF Pin Current

ON/OFF Pin = 0V

20

7

37

μA

θJA

Thermal Resistance

P Package, Junction to Ambient(1)

95

°C/W

D Package, Junction to Ambient(1)

105

(1)

Junction to ambient thermal resistance with approximately 1 square inch of printed circuit board copper surrounding the leads. Additional

copper area will lower thermal resistance further. See Application Information section in the application note accompanying this

datasheet and the thermal model in LM267X Made Simple software (version 6.0). The value

θJ−A for the WSON (NHN) package is

specifically dependent on PCB trace area, trace material, and the number of layers and thermal vias. For improved thermal resistance

and power dissipation for the WSON package, refer to Application Note AN-1187 (SNOA401).

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