PM6644 데이터 시트보기 (PDF) - STMicroelectronics
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PM6644 Datasheet PDF : 35 Pages
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PM6644
Figure 3. Pinout
Simplified application schematic
1.1
Pin description
Table 2. Pin description
Pin
Name
Description
1
REF 1.216 V internal reference voltage. Do not connect this pin to any external component.
Feedback input for the switching section:
2
FB
If this pin is connected to VCC, OUT operates at 3.47 V (Fixed mode).
If this pin is connected to a resistive divider from OUT to GND, OUT can be adjusted
from 0.9 V to 8 V.
3
TON
Switching frequency setting. Connect to VIN with a resistor to properly set the switching
frequency.
ENABLE (EN) pin. The EN pin is used to enable both the switching regulator and
4
EN internal reference. Tie to ground to shut down the device. Apply 2.1 V or more for normal
operation. If the EN pin is not used for power sequencing, tie this pin to the VIN pin.
5
GND Power and signal ground connection.
6
SW
The SW pin is the switching node of the switching regulator with integrated power
MOSFETs. Connect this pin to the inductor.
Input voltage for the switching regulator. Bypass to GND with a 1-2.2 µF MLCC
7
VIN capacitor. The VIN pin supplies current to the internal switching regulator and to the
integrated voltage generator that supplies VCC if BYP < 2.4 V.
Output of a regulator that supplies the main switching controller. Bypass to GND with a 1
8
VCC
µF capacitor. An integrated voltage generator regulates at 3.8 V (when VIN> = 6 V) if
BYP< 2.4 V. When BYP > 3.2 V, the integrated voltage generator shuts down and VCC is
connected to BYP through a MOSFET switch (see Figure 18 ).
9
BYP
VCC BYPASS pin (BYP). If BYP > 3.2 V, VCC is supplied by BYP through a MOSFET
switch. Bypass to GND with a 10-100 nF capacitor.
10
REF3
Integrated 3.3 V high accuracy reference voltage. Bypass to GND with a 100 nF
capacitor. VREF3 is the voltage at REF3 pin.
EXP PAD EXP PAD Exposed pad. Connect to signal ground.
Doc ID 023203 Rev 1
7/35
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