LM3671_08 datasheet(7/24 Pages) NSC

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Note 2: All voltages are with respect to the potential at the GND pin.

Note 3: Internal thermal shutdown circuitry protects the device from permanent damage. Thermal shutdown engages at T

J= 150°C (typ.) and disengages at

J= 130°C (typ.).

Note 4: The Human body model is a 100 pF capacitor discharged through a 1.5 k

Ω resistor into each pin. The machine model is a 200 pF capacitor discharged

directly into each pin. MIL-STD-883 3015.7

Note 5: In Applications where high power dissipation and/or poor package resistance is present, the maximum ambient temperature may have to be derated.

Maximum ambient temperature (T

A-MAX) is dependent on the maximum operating junction temperature (TJ-MAX), the maximum power dissipation of the device in

the application (P

D-MAX) and the junction to ambient thermal resistance of the package (θJA) in the application, as given by the following equation:TA-MAX= TJ-MAX

− (θ

JAx PD-MAX). Refer to Dissipation rating table for PD-MAX values at different ambient temperatures.

Note 6: Junction to ambient thermal resistance is highly application and board layout dependent. In applications where high power dissipation exists, special care

must be given to thermal dissipation issues in board design. Specified value of 130 °C/W for SOT23-5 is based on a 4 layer, 4" x 3", 2/1/1/2 oz. Cu board as per

JEDEC standards is used.

Note 7: Refer to datasheet curves for closed loop data and its variation with regards to supply voltage and temperature. Electrical Characteristic table reflects

open loop data (FB=0V and current drawn from SW pin ramped up until cycle by cycle current limit is activated). Closed loop current limit is the peak inductor

current measured in the application circuit by increasing output current until output voltage drops by 10%.

Note 8: Min and Max limits are guaranteed by design, test or statistical analysis. Typical numbers are not guaranteed, but do represent the most likely norm.

Note 9: The parameters in the electrical characteristic table are tested at V

IN= 3.6V unless otherwise specified. For performance over the input voltage range

refer to datasheet curves.

Note 10: The input voltage range recommended for ideal applications performance for the specified output voltages are given below:

IN = 2.7V to 4.5V for 1.1V ≤ VOUT < 1.5V

IN = 2.7V to 5.5V for 1.5V ≤ VOUT < 1.8V

IN = (VOUT+ VDROPOUT) to 5.5V for 1.8V ≤ VOUT ≤ 3.3V

where V

DROPOUT = ILOAD *( RDSON, PFET + RINDUCTOR)

Note 11: ADJ version is configured to 1.5V output. For ADJ output version:

IN = 2.7V to 4.5V for 0.90V ≤ VOUT < 1.1V

IN = 2.7V to 5.5V for 1.1V ≤ VOUT < 3.3V

Note 12: Test condition: for V

OUT less than 2.5V, VIN = 3.6V; for VOUT greater than or equal to 2.5V, VIN = VOUT+ 1V.

Dissipation Rating Table

A≤ 25°C

Power Rating

A= 60°C

Power Rating

A= 85°C

Power Rating

130°C/W (4 layer board)

SOT23-5

770mW

500mW

310mW

85°C/W (4 layer board) 5-bump

Micro SMD

1179mW

765mW

470mW

165°C/W (4 layer board) 6-pin

LLP

606mW

394mW

242mW

LM3671 Datasheet(PDF) 7 Page - National Semiconductor (TI)

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