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ZHCSEU9C March 2016 – June 2018 LMZ34202

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- MPQF400A

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7.3.3 Recommended Operating Range

Table 4 and Table 5 below show the allowable switching frequencies for a given range of output voltages. Reference Table 4 for applications where the maximum output current is 1.75 A or less. Reference Table 5 for applications that the output current is greater than 1.75 A. Notice that applications requiring less than 1.75 A can operate over a much wider range of switching frequencies. For the most efficient solution, always operate at the lowest allowable frequency.

Table 4. Switching Frequency vs Output Voltage
Output Current ≤ 1.75 A

V_OUT RANGE (V)	SWITCHING FREQUENCY RANGE (kHz)
	PVIN = 12 V		PVIN = 24 V		PVIN = 36 V
	MIN	MAX	MIN	MAX	MIN	MAX
2.5 - 3.5 V	200	1000	200	600	200	400
>3.5 - 4.5 V	200	1000	200	850	200	550
>4.5 - 5.5 V	200	1000	200	1000	200	750
>5.5 - 6.5 V	300	1000	200	1000	200	1000
>6.5 - 7.5 V	300	900	300	1000	300	950

Table 5. Switching Frequency vs Output Voltage
Output Current > 1.75 A

V_OUT RANGE (V)	SWITCHING FREQUENCY RANGE (kHz)
	PVIN = 12 V		PVIN = 24 V		PVIN = 36 V
	MIN	MAX	MIN	MAX	MIN	MAX
2.5 - 3.5 V	200	450	200	500	200	400
>3.5 - 4.5 V	200	500	200	600	200	550
>4.5 - 5.5 V	200	500	200	650	200	700
>5.5 - 6.5 V	300	500	250	700	250	800
>6.5 - 7.5 V	300	400	300	750	300	800