LM3679TL-1.8EV National Semiconductor, LM3679TL-1.8EV Datasheet - Page 3

• Manufacturer Part Number: LM3679TL-1.8EV
• Description: BOARD EVALUATION LM3679TL-1.8
• Manufacturer: National Semiconductor
• Series: PowerWise®r

Specifications of LM3679TL-1.8EV

• Main Purpose: DC/DC, Step Down
• Outputs And Type: 1, Non-Isolated
• Voltage - Output: 1.8V
• Current - Output: 350mA
• Voltage - Input: 2.5 ~ 5.5V
• Regulator Topology: Buck
• Frequency - Switching: 3MHz
• Board Type: Fully Populated
• Utilized Ic / Part: LM3679
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Power - Output: -

V
V
V
I
I
R
R
I
V
V
I
F
SHDN
Q
LIM
EN
OSC
IN
FB
REF
IH
IL
DSON (P)
DSON (N)
Absolute Maximum Ratings
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
If Military/Aerospace specified devices are required, please
contact the National Semiconductor Sales Office/Distributors
for availability and specifications.
Electrical Characteristics
Limits in boldface type apply over the operating ambient temperature range (−30°C
specifications apply to the LM3679TL/UR with V
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the component may occur. Operating Ratings are conditions under which operation
of the device is guaranteed. Operating Ratings do not imply guaranteed performance limits. For guaranteed performance limits and associated test conditions,
see the Electrical Characteristics tables.
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
T
Note 4: The Human body model is a 100 pF capacitor discharged through a 1.5 kΩ 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
the application (P
− (θ
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. Value specified here 85 °C/W is based on measurement results using a 4 layer board as per JEDEC
standards.
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 under open loop conditions at V
the input voltage range and closed loop condition, refer to the datasheet curves.
Note 10: Input voltage will depend on I
V
FB, SW, EN Pin:
Continuous Power Dissipation
(Note 3)
Junction Temperature (T
Storage Temperature Range
Maximum Lead Temperature
Symbol
J
= 130°C (typ.).
IN
(Soldering, 10 sec.)
JA
Pin: Voltage to GND
x P
D-MAX
). Refer to Dissipation rating table for P
Input Voltage
Feedback Voltage
Internal Reference Voltage
Shutdown Supply Current
DC Bias Current into V
Pin-Pin Resistance for PFET
Pin-Pin Resistance for NFET
Switch Peak Current Limit
Logic High Input
Logic Low Input
Enable (EN) Input Current
Internal Oscillator Frequency
D-MAX
) and the junction to ambient thermal resistance of the package (θ
J-MAX
Parameter
A-MAX
)
OUT MAX
) is dependent on the maximum operating junction temperature (T
IN
value. I
−65°C to +150°C
Internally Limited
D-MAX
OUT MAX
(Note 2)
(GND−0.2V) to
−0.2V to 6.0V
(Note 1)
(V
IN
values at different ambient temperatures.
IN
= EN = 3.6V.
= 300mA -> VIN = 2.5 to 5.5V. I
(Note 10)
PWM mode
EN = 0V
No load, device is not switching
V
V
Open Loop(Note 7)
PWM Mode
+125°C
+ 0.2V)
IN
IN
,
260°C
= V
= V
(Note 8)
GS
GS
= 3.6V, I
= 3.6V, I
3
,
Condition
(Note 9)
Operating Ratings
Thermal Properties
SW
SW
ESD Rating (Note 4)
Input Voltage Range
Recommended Load Current
Junction Temperature (T
Ambient Temperature (T
5)
Junction-to-Ambient Thermal
Resistance (θ
Human Body Model: All Pins
Machine Model: All Pins
= 100mA
= -100mA
JA
) in the application, as given by the following equation: T
OUT MAX
Limits in standard typeface are for T
IN
= 350mA - > VIN = 2.7V to 5.5V
JA
= 3.6V unless otherwise specified. For performance over
) (Note 6)
≤
J-MAX
T
A
), the maximum power dissipation of the device in
≤
+85°C). Unless otherwise noted,
A
J
) Range
) Range (Note
Min
-2.5
820
2.5
1.0
2.5
J
= 150°C (typ.) and disengages at
(Note 1)
0.01
0.01
Typ
350
150
950
0.5
16
3
,
−30°C to +125°C
−30°C to +85°C
(Note 2)
0mA to 350 mA
J
1075
+2.5
Max
450
250
5.5
0.4
3.5
= T
35
2.5V to 5.5V
1
1
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A-MAX
A
85°C/W
= 25°C.
2.0 kV
= T
200V
Units
MHz
mΩ
mΩ
J-MAX
mA
µA
µA
µA
%
V
V
V
V