Details

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Below is the parameter table and instructions for the SSC3S927L, a 3A Synchronous Buck Converter.

Parameter Table

Parameter	Symbol	Min	Typ	Max	Unit	Condition
Input Voltage Range	VIN	2.7	-	5.5	V	-
Output Voltage Range	VOUT	0.8	-	3.6	V	Adjustable with external resistors
Output Current	IOUT	-	3	-	A	Continuous
Switching Frequency	fSW	1.0	2.0	2.2	MHz	Programmable
Efficiency (Typical)	η	-	92	-	%	VIN = 5V, VOUT = 3.3V, IOUT = 1A
Quiescent Current	IQ	-	30	-	μA	No load, VIN = 5V
Shutdown Current	ISD	-	1	-	μA	VIN = 5V, SHDN = 0V
Soft-Start Time	tSS	2.0	4.0	6.0	ms	Typical
Thermal Shutdown Temperature	TSD	150	-	160	°C	-
Operating Temperature Range	TOPR	-40	-	125	°C	-
Storage Temperature Range	TSTG	-65	-	150	°C	-
Package Type	-	-	-	-	3x3 QFN-10	-

Instructions

1. Pin Configuration

• VIN: Input voltage.
• VOUT: Output voltage.
• GND: Ground.
• FB: Feedback pin for output voltage adjustment.
• EN/UVLO: Enable/Under-Voltage Lockout.
• PG: Power Good indicator.
• BST: Bootstrap capacitor connection.
• SS/TRK: Soft-start/Tracking pin.
• NC: No Connect.
• EXPOS: Exposed pad for thermal dissipation.

2. Output Voltage Adjustment

• The output voltage can be adjusted using an external resistor divider connected to the FB pin.
• Use the formula: ( V_ = V_ times left(1 + fracright) )
  • ( V_ ) is typically 0.8V.
  • Choose R1 and R2 to set the desired output voltage.

3. Switching Frequency Setting

• The switching frequency can be set using an external resistor connected to the FREQ pin.
• Use the formula: ( f_ = frac{1.25 times 10^6}{R_} )
  • ( R_ ) is the resistance in ohms.

4. Enable/UVLO Function

• The EN/UVLO pin controls the enable function and under-voltage lockout.
• Apply a high logic level (≥1.2V) to enable the converter.
• The UVLO threshold is typically 2.3V.

5. Power Good Indicator

• The PG pin indicates when the output voltage is within the regulation range.
• It outputs a high logic level when VOUT is within ±10% of the set point.

6. Soft-Start and Tracking

• The SS/TRK pin controls the soft-start time and can be used for tracking other power supplies.
• Connect a capacitor from SS/TRK to GND to set the soft-start time.

7. Thermal Management

• Ensure proper heat dissipation by soldering the exposed pad (EXPOS) to a large ground plane on the PCB.
• Use a heatsink if necessary, especially at high output currents.

8. Capacitor Selection

• Input Capacitor (CIN): Use a ceramic capacitor with low ESR, typically 10μF to 22μF.
• Output Capacitor (COUT): Use a ceramic or tantalum capacitor, typically 10μF to 22μF.
• Bootstrap Capacitor (CBST): Use a ceramic capacitor, typically 0.1μF.

9. Layout Considerations

• Keep the input and output capacitors close to the IC.
• Minimize trace lengths for high-frequency signals (e.g., SW node).
• Use wide traces for power paths to reduce resistance and inductance.

10. Storage and Handling

• Store the device in a dry environment to prevent moisture damage.
• Handle with care to avoid static discharge and mechanical damage.

For detailed application circuits and more advanced configurations, refer to the datasheet provided by the manufacturer.

(For reference only)