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LM3671TLX-1.5 Fiches technique(PDF) 7 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
No de pièce LM3671TLX-1.5
Description  2MHz, 600mA Step-Down DC-DC Converter
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Fabricant  NSC [National Semiconductor (TI)]
Site Internet  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM3671TLX-1.5 Fiches technique(HTML) 7 Page - National Semiconductor (TI)

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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
T
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:
V
IN = 2.7V to 4.5V for 1.1V VOUT < 1.5V
V
IN = 2.7V to 5.5V for 1.5V VOUT < 1.8V
V
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:
V
IN = 2.7V to 4.5V for 0.90V VOUT < 1.1V
V
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
θ
JA
T
A25°C
Power Rating
T
A= 60°C
Power Rating
T
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
7
www.national.com


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