LM3678SD-1.2EV National Semiconductor, LM3678SD-1.2EV Datasheet - Page 4

• Manufacturer Part Number: LM3678SD-1.2EV
• Description: BOARD EVAL FOR LM3678SD-1.2
• Manufacturer: National Semiconductor
• Series: PowerWise®r

Specifications of LM3678SD-1.2EV

• Main Purpose: DC/DC, Step Down
• Outputs And Type: 1, Non-Isolated
• Voltage - Output: 0.8V or 1.2V
• Current - Output: 1.5A
• Voltage - Input: 2.5 ~ 5.5V
• Regulator Topology: Buck
• Frequency - Switching: 3.3MHz
• Board Type: Fully Populated
• Utilized Ic / Part: LM3678
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Power - Output: -

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V
V
R
R
I
I
V
V
I
F
LIM
SHDN
EN
OSC
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.
Electrical Characteristics
apply over the full operating ambient temperature range (−30°C
the LM3678 Typical Application Circuit (pg. 1) with V
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device 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: 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 5: 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.
Note 6: 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 7: 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 8: The parameters in the electrical characteristic table are tested at V
refer to datasheet curves.
V
EN Pin:
FB, SW Pin:
Continuous Power Dissipation
(Note 3)
Junction Temperature (T
Symbol
J
= 130°C (typ.).
IN
JA
Pin: Voltage to GND
x P
D-MAX
).
Feedback Voltage
Internal Reference Voltage
Pin-Pin Resistance for PFET
Pin-Pin Resistance for NFET
Switch Peak Current Limit
Shutdown Supply Current
Logic High Input for EN & VSELECT
Logic Low Input for EN & VSELECT
Enable (EN) Input Current
Internal Oscillator Frequency
D-MAX
) and the junction to ambient thermal resistance of the package (θ
J-MAX
A-MAX
Parameter
)
) is dependent on the maximum operating junction temperature (T
Internally Limited
(Notes 2, 6, 8)
(GND−0.2V) to
−0.2V to 6.0V
−0.2V to 6.0V
(Note 1)
(V
IN
+150°C
+ 0.2V)
IN
= EN = 3.6V
VSELECT = Low & High
(Note 7)
V
V
Open loop
EN = 0V
V
V
PWM Mode
IN
IN
IN
IN
= V
= V
= 3.6V
= 3.6V
IN
Limits in standard typeface are for T
GS
GS
= 3.6V unless otherwise specified. For performance over the input voltage range
4
= 3.6V
= 3.6V
≤
T
Condition
A
Operating Ratings
Thermal Properties
Storage Temperature Range
Maximum Lead Temperature
Input Voltage Range
Recommended Load Current
Junction Temperature (T
Ambient Temperature (T
4)
Junction-to-Ambient Thermal
Resistance (θ
4 layer board (Note 5)
≤
JA
+85°C). Unless otherwise noted, specifications apply to
) in the application, as given by the following equation: T
(Soldering, 10 sec.)
JA
) (LLP-10) for
J-MAX
), the maximum power dissipation of the device in
A
J
Min
1.9
1.2
2.7
) Range
) Range (Note
-3
J
= 25°C. Limits in boldface type
J
= 150°C (typ.) and disengages at
(Notes 1, 2)
2.15
0.01
Typ
150
110
0.5
3.3
−65°C to +150°C
−30°C to +125°C
−30°C to +85°C
Max
200
150
2.4
0.4
3.6
+3
2.5V to 5.5V
0mA to 1.5A
1
1
A-MAX
49.8°C/W
260°C
= T
Units
MHz
J-MAX
mΩ
mΩ
µA
µA
%
V
A
V
V