LM3678SD-1.2EV National Semiconductor, LM3678SD-1.2EV Datasheet - Page 2

• 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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Connection Diagrams
Note: the above figures are not to any actual scale
Pin Descriptions
Pin#
DAP
10
1
2
3
4
5
6
7
8
9
VSELECT
PGOOD
MODE
Name
GND
GND
VDD
VDD
DAP
SW
EN
FB
Top View
Description
Ground
Switching node connection to the internal PFET switch and NFET synchronous rectifier.
Power supply input. Connect to the input filter capacitor (Figure 1).
Output Voltage Select.
For Example : VSELECT = LOW V
VSELECT = HIGH, V
Power Good Flag. This common drain logic output is pulled to ground when the output voltage is
not within ± 7.5% of regulation.
Mode Control Pin:
Mode = 1 selects forced PWM mode
Mode = 0 selects auto PFM-PWM mode
Enable Pin. The device is in shutdown mode when voltage to this pin < 0.4V and enabled when >
1.0V. Do not leave this pin floating.
Feedback Analog Input. Connect directly to the output filter capacitor for fixed voltage versions.
Die Attach Pad; connect the DAP to GND on PCB layout to enhance thermal performance. It should
not be used as a primary ground connection.
30038702
OUT
= 1.2V
2
OUT
= 0.8V
Bottom View
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