LM3671_08 Datasheet, PDF (3/24 Pages) National Semiconductor (TI) – 2MHz, 600mA Step-Down DC-DC Converter

20108462
FIGURE 5. 6-Pin LLP Package Number LCA06B (2mm x 2mm x 0.6mm)
Pin Descriptions (SOT23-5)
Pin #
1
2
3
4
5
Name
V_IN
GND
EN
FB
SW
Description
Power supply input. Connect to the input filter capacitor (Figure 1).
Ground pin.
Enable pin. 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.
Pin Descriptions (5-Bump Micro SMD)
Pin #
A1
A3
C1
C3
B2
Name
V_IN
GND
EN
FB
SW
Description
Power supply input. Connect to the input filter capacitor (Figure 1).
Ground pin.
Enable pin. 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.
Pin Descriptions (6-Pin LLP)
Pin #
1
2
3
4
5
6
Name
EN
Pgnd
V_IN
SW
Sgnd
FB
Description
Enable pin. 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.
Ground pin.
Power supply input. Connect to the input filter capacitor ().
Switching node connection to the internal PFET switch and NFET synchronous rectifier.
Singnal ground (feedback ground).
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.
3
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