MP2276

– 16V, 8A, HIGH EFFICIENCY, SYNC, STEP-DOWN CONVERTER

MP2276 Rev.1.0

www.MonolithicPower.com

12

3/22/2017

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PIN FUNCTIONS

Pin #

Name

Description

1, 14

PGND

System ground. PGND is the reference ground of the regulated output voltage.

PGND requires careful consideration during PCB layout. Connect using wide PCB

traces.

2, 11

SW

Switch output. Connect SW to the inductor and bootstrap capacitor. SW is driven

up to VIN by the high-side switch during the on-time of the PWM duty cycle. The

inductor current drives SW negative during the off-time. Connect using wide PCB

traces.

3

VIN

Supply voltage. VIN supplies power to the internal MOSFET and regulator.

Decouple the input rail with an input capacitor. Connect using wide PCB traces and

multiple vias.

4

ILIM

Current limit. Connect a resistor from ILIM to ground to set the current limit trip

point.

5

EN

Enable. EN is a digital input that turns the regulator on or off. Drive EN high to turn

on the regulator; drive EN low to turn off the regulator. Connect EN to VIN through

a pull-up resistor or a resistive voltage divider for automatic start-up. Do not float

EN.

6

FB

Feedback. An external resistor divider from the output to GND tapped to FB sets

the output voltage. Place the resistor divider as close to FB as possible. Vias

should be avoided on the FB traces.

7

AGND

Analog ground. Select AGND as the control circuit reference point.

8

SS/TRK

External tracking voltage input. The output voltage tracks this input signal.

Decouple SS/TRK with a ceramic capacitor as close to it as possible. Ceramic

capacitors with X7R or X5R grade dielectrics are recommended for their stable

temperature characteristics. The capacitance of this capacitor determines the soft-

9

PG

Power good output. PG is an open-drain signal. A pull-up resistor connected to a

DC voltage is required to indicate high if the output voltage is within regulation.

There is a delay of about 1ms from the time FB

≥ 92.5% to PG pulling high.

10

BST

Bootstrap. Connect a capacitor between SW and BST to form a floating supply

across the high-side switch driver.

12

FREQ/MODE

Operation mode selection. Program FREQ/MODE to select CCM or pulse-skip

mode and the operating switching frequency. See Table 1 on page 15 for details.

13

VCC

Internal 3V LDO output. VCC supplies power to the driver and control circuits.

Decouple VCC with a minimum 1µF ceramic capacitor as close to it as possible.

Ceramic capacitors with X7R or X5R grade dielectrics are recommended for their

stable temperature characteristics.