MPQ28164 – SINGLE-INDUCTOR, BUCK-BOOST CONVERTER W/ 4.2A SWITCHES

MPQ28164 Rev. 1.0

www.MonolithicPower.com

3

11/13/2018

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PIN FUNCTIONS

Pin #

Name

Description

1

EN

On/off control. Pull EN high to enable the MPQ28164. Pull EN low or leave EN

floating to disable all of the internal circuits. EN is pulled down to AGND with a

1.5MΩ

resistor internally.

2

MODE/SYNC

Operation mode selection. If MODE/SYNC is low, the MPQ28164 switches between

PSM and fixed frequency PWM automatically according to the load level. If

MODE/SYNC is

high,

the

MPQ28164

works

in

fixed-frquency PWM mode

continuously. An external clock can be applied to MODE/SYNC for switching

frequency synchronization. MODE/SYNC is pulled down to AGND with a

1MΩ resistor

internally. MODE/SYNC should be pulled high or low through a resistor smaller than

10kΩ.

3

PG

Power good indicator. PG switches high and low based on the feedback voltage.

4

VCC

Supply voltage for control stage. VCC is powered by the higher value of either VIN

or VOUT. Decouple VCC with a

1μF capacitor.

5

AGND

Signal ground.

6

FB

Output voltage feedback. Keep FB and its associated traces far away from noise

sources like SW.

7

VOUT

Buck-boost converter output. An output capacitor should be placed close to VOUT

and PGND.

8

SW2

Switch. Internal switches are connected to SW2. Connect an inductor between SW1

and SW2.

9

PGND

Power ground.

10

SW1

Switch. Internal switches are connected to SW1. Connect an inductor between SW1

and SW2.

11

VIN

Supply voltage for the power stage.

ABSOLUTE MAXIMUM RATINGS (1)

VIN to GND .......................................-0.3V to 6V

SW1/2 to GND .................. -0.3V (-2V for <10ns)

to 6.5V (8.5V for <10ns)

All other pins .....................................-0.3V to 6V

Junction temperature ................................150°C

Lead temperature .....................................260°C

Continuous power dissipation (TA = +25°C)

(2)

QFN-11 (2mmx3mm) ............................... 1.78W

Storage temperature ................ -65

C to +150C

Recommended Operating Conditions

(3)

Startup supply voltage (VST)............1.8V to 5.5V

Operation voltage (VIN) ...............1.2V

(4) to 5.5V

Output voltage (VOUT) .........................1.5V to 5V

Operating junction temp. (TJ)... -40°C to +125°C

Thermal Resistance

(4)

θJA

θJC

QFN-11 (2mmx3mm).............. 70 ...... 15... °C/W

NOTES:

1) Exceeding these ratings may damage the device.

2) The maximum allowable power dissipation is a function of the

maximum junction temperature TJ (MAX), the junction-to-

ambient thermal resistance θ

JA, and the ambient temperature

TA. The maximum allowable continuous power dissipation at

any ambient temperature is calculated by PD (MAX) = (TJ

(MAX)-TA)/θJA. Exceeding the maximum allowable power

dissipation produces an excessive die temperature, causing

the regulator to go into thermal shutdown. Internal thermal

shutdown circuitry protects the device from permanent

damage.

3) The device is not guaranteed to function outside of its

operating conditions.

4) If VCC is powered from a source higher than 1.8V (such as

VOUT), the MPQ28164 can work down to VIN = 1.2V, but the

load capability is lower because of the high RDS(ON) of SWA

and low current limit.

5) Measured on JESD51-7, 4-layer PCB.