Details

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Wide Input Range Synchronous Buck Controller with Analog Current Monitor

Parameter	Symbol	Min	Typ	Max	Unit	Description
Input Voltage	VIN	4.5	-	60	V	Operating input voltage range
Output Voltage	VOUT	-	-	-	V	Programmable, depends on external components
Switching Frequency	fSW	100	500	2000	kHz	Adjustable switching frequency
Quiescent Current	IQ	-	90	-	渭A	Typical quiescent current
Maximum Duty Cycle	DMAX	-	87	-	%	Maximum duty cycle
Minimum ON Time	tON(MIN)	75	-	-	ns	Minimum switch ON time
Minimum OFF Time	tOFF(MIN)	75	-	-	ns	Minimum switch OFF time
Current Limit	ILIM	-	3.8	-	A	Peak inductor current limit
Power Good Delay	tPGD	-	2.4	-	ms	Power good delay
UVLO Threshold (Rising)	VUVLO(R)	2.7	-	-	V	Under-voltage lockout threshold (rising)
UVLO Threshold (Falling)	VUVLO(F)	-	2.2	-	V	Under-voltage lockout threshold (falling)

Instructions for Use:

1. Input Voltage Setup: Ensure the input voltage is within the specified range of 4.5V to 60V.
2. Output Voltage Configuration: Set the output voltage using external resistors according to the datasheet formula.
3. Frequency Adjustment: Adjust the switching frequency via an external resistor or use default settings if fixed-frequency operation is acceptable.
4. Current Limiting: Monitor and adjust the peak inductor current limit to protect against overcurrent conditions.
5. Power Good Functionality: Utilize the power good delay feature to ensure stable output before enabling downstream circuits.
6. Under-Voltage Lockout: Verify that the input voltage does not drop below the UVLO thresholds to prevent improper operation.

For detailed design considerations and specific application notes, refer to the LM5117PMHX datasheet.

(For reference only)