MP2269 - 30V, 1A, LOW IQ, SYNCHRONOUS STEP-DOWN CONVERTER

MP2269 Rev. 1.0

www.MonolithicPower.com

5

10/11/2016

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PIN FUNCTIONS

Pin #

QFN-15

(2mmx3mm)

Name

Description

1

MODE

Mode selection. Pull MODE low or float MODE to set auto PFM/PWM mode; pull

MODE high to set forced PWM mode. MODE is pulled down internally. Select MODE

before the part starts up.

2

VIN

Input supply. VIN supplies power to all the internal control circuitries and the power

switch connected to SW. A decoupling capacitor to ground must be placed close to

VIN to minimize switching spikes.

3, 8

PGND

Power ground.

4

EN

Enable. Pull EN below the specified threshold to shut down the MP2269. Pull EN up

above the specified threshold to enable the MP2269.

5

NC

No connection. Leave NC floating.

6

PG

Power good output. The output of PG is an open drain.

7

BIAS

Bias input. BIAS must be connected to GND if the bias function is not being used.

9

SW

Switch node. SW is the output of the internal power switch.

10

BST

Bootstrap. BST is the positive power supply for the high-side MOSFET driver

connected to SW. Connect a bypass capacitor between BST and SW.

11

VCC

Internal LDO output. VCC supplies power to the internal control circuit and gate

drivers. A decoupling capacitor to ground is required close to VCC.

12

AGND

Analog ground.

13

SS

Soft-start input. Place a capacitor from SS to GND to set the soft-start period. The

MP2269 sources 10µA from SS to the soft-start capacitor during start-up. As the SS

voltage rises, the feedback threshold voltage increases to limit inrush current during

start-up.

14

FB

Feedback input. Connect FB to the center point of the external resistor divider. The

feedback threshold voltage is 0.8V.

15

FREQ

Switching frequency set. Connect a resistor from FREQ to ground to set the

switching frequency.