MP2316 Rev. 1.11

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10

4/11/2017

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PIN FUNCTIONS

Package

Pin #

Name

Description

1,12

GND

System Ground. These pins are the reference ground for the regulated output voltage,

and require special consideration during PCB layout.

2, 13

SW

Switch output. Connect using wide PCB traces.

3, 14

VIN

Supply Voltage. The MP2316 operates from a +4V to +19V input rail. C1 is needed to

decouple the input rail. Use wide PCB traces and multiple vias to make the connection.

4

FREQ/MODE

Frequency set during CCM operation. Connect a resistor to VIN to set the switching

frequency and part works at forced PWM mode. Connect a resistor to GND to set the

switching frequency and part works at auto PFM/PWM mode. Don’t float this pin.

5

PG

Power-Good Output. The output of this pin is an open drain that goes high if the output

voltage is higher than 90% of the nominal voltage. There is a 40µs delay between when

FB ≥ 90% and when the PG pin goes high.

6

SS

Soft start. Connect a capacitor across SS and GND to set the soft-start time to avoid

start up inrush current.

7

FB

Feedback. Sets the output voltage when connected to the tap of an external resistor

divider that is connected between output and GND.

8

CR

Internal Ramp Adjust. Connect a capacitor from VOUT to this pin to adjust the internal

ramp amplitude. This can be used to improve the transient performance.

9

EN

EN = 1 to enable the MP2316. For automatic start-up, connect EN pin to VIN with a

pull-up resistor.

10

BST

Bootstrap requires a capacitor connected between SW and BST pins to form a floating

supply across the high-side switch driver.

11

VCC

Internal Bias Supply. Internal 5V LDO output. Decouple with a 1µF ceramic capacitor as

close to the pin as possible.