LM3671MF-1.5EV National Semiconductor, LM3671MF-1.5EV Datasheet - Page 3

• Manufacturer Part Number: LM3671MF-1.5EV
• Description: BOARD EVALUATION LM3671MF-1.5
• Manufacturer: National Semiconductor
• Series: PowerWise®r

Specifications of LM3671MF-1.5EV

• Main Purpose: DC/DC, Step Down
• Outputs And Type: 1, Non-Isolated
• Voltage - Output: 1.5V
• Current - Output: 600mA
• Voltage - Input: 2.7 ~ 5.5V
• Regulator Topology: Buck
• Frequency - Switching: 2MHz
• Board Type: Fully Populated
• Utilized Ic / Part: LM3671
• Lead Free Status / RoHS Status: Not applicable / Not applicable
• Power - Output: -

Pin#
1
2
3
4
5
Powering the LM3671 for Bench
Measurements
When powering the LM3671 with a bench power supply, it is
recommended to place a 100 µF tantalum capacitor across
the V
This capacitor will reduce the input spike caused by the power
Connection Diagram and Package Mark Information
TABLE 2. Pin Descriptions (SOT23-5)
IN
and GND supply terminals of the bench power supply.
Name
VIN
GND
EN
FB
SW
Description
Power supply input. Connect to the input filter capacitor
Ground pin
Enable input. The device is in shutdown mode when voltage to this pin is < 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. For
adjustable version external resistor dividers are required (Figure 2). The internal resistor dividers are
disabled for the adjustable version.
Switching node connection to the internal PFET switch and NFET synchronous rectifier.
FIGURE 4. 6–Pin LLP, Top View
FIGURE 3. SOT23–5, Top View
3
supply and long power cables. The combination of the power
supply and inductance within the power cables produce a
large voltage spike that may damage the device. In addition,
consideration must also be looked at the enable pin of the
device. The enable should never be taken high, until minimum
guaranteed operating voltage of 2.7V is reached. The enable
pin should also never exceed the input voltage.
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