LM3674 Datasheet, PDF (5/15 Pages) National Semiconductor (TI) – 2MHz, 600mA Step-Down DC-DC Converter in SOT 23-5

Electrical Characteristics (Notes 2, 9, 10) Limits in standard typeface are for T_J = 25˚C. Limits in boldface
type apply over the full operating junction temperature range (−30˚C ≤ T_J ≤ 125˚C). Unless otherwise noted, specifications
apply to the LM3674 with V_IN = EN = 3.6V (Continued)
Note 11: Input voltage range recommended for ideal applications performance for the specified output voltages are given below
V_IN = 2.7V to 5.5V for 1.0V ≤ V_OUT < 1.8V
V_IN = ( V_OUT + V_{DROP OUT}) to 5.5V for 1.8 ≤ V_OUT≤ 3.3V
Where V_{DROP OUT} = I_LOAD * (R_{DSON (P)} + R_INDUCTOR)
Note 12: Feedback voltage specification for ADJ include the tolerances of the resistor divider network. ADJ configured to 1.5V output.
Dissipation Rating Table
θ_JA
T_A ≤ 25˚C (Power Rating) T_A = 60˚C (Power Rating) T_A = 85˚C (Power Rating)
250˚C/W (2 layer board)
400mW
260mW
160mW
130˚C/W (4 layer board)
770mW
500mW
310mW
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