MP2321 – 19V, 2A, LOW IQ, STEP-DOWN CONVERTER

MP2321 Rev. 1.1

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21

5/24/2019

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TYPICAL APPLICATION CIRCUITS (continued)

Figure 17: VIN = 12V, VOUT = 1.5V, IOUT = 2A, FS = 500kHz

NOTE:

a.

Use R6 = 196kΩ to set forced PWM. Use R7 = 220kΩ to set auto PFM/PWM. The recommended R6 and R7 values are based on

Equation (12) and Equation (13) and optimized according to test results.

b.

Recommend to pull-up PG to IC VCC pin. If need pull-up PG to external power supply, please refer to the PG description in

application information section.

Figure 18: VIN = 12V, VOUT = 1.8V, IOUT = 2A, FS = 500kHz

NOTE:

a.

Use R6 = 243kΩ to set forced PWM. Use R7 = 255kΩ to set auto PFM/PWM. The recommended R6 and R7 values are based on

Equation (12) and Equation (13) and optimized according to test results.

b.

Recommend to pull-up PG to IC VCC pin. If need pull-up PG to external power supply, please refer to the PG description in

application information section.