MP5512 datasheet(10/22 Pages) MPS

10 / 22 page

MP5512 – 18V, 4.5A ENERGY STORAGE AND MANAGEMENT UNIT

MP5512 Rev. 1.1

www.MonolithicPower.com

4/27/2016

MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.

PIN FUNCTIONS

QFN28

(4mm×5mm)

Pin #

Name

Description

CST

Storage Capacitor for Internal Charge Pump. Requires 10nF decouple capacitor

between CST and AGND to drive the MOSFET current limit. Do not connect to a

capacitor with over 47nF.

VCC

Internal LDO Output. VCC provides power for internal circuits. Decouple with a 1µF

ceramic capacitor. Connect the capacitor as close to VCC as possible.

ILIM

DC Input Current Limit. Connect a resistor between ILIM and AGND to adjust the

DC limit from VIN to VB.

TPOR

Power-On-Reset Delay. Connect a capacitor between TPOR and AGND to

determine the power-on-reset delay time. During the default power-on-reset delay

time, leave TPOR floating for 0.35ms.

DVDT

Bus Voltage Start-Up Slew Rate. Connect a capacitor from DVDT to AGND. Leave it

floating for the default soft-start time (around 0.9ms from 0V to 12V).

PFI

Power-Failure Indicator. PFI is an open-drain output. To indicate a signal, PFI

should be pulled up to a power source through a resistor. PFI goes high if the DET

voltage exceeds 1.02×VDET-REF. PFI goes low if the DET voltage drops below

0.99×VDET-REF. If MP5512 is disabled by UVLO or EN UVLO, it operates with high

impedance.

WARN

VIN Voltage-Drop Warning Indicator. WARN is an open-drain output. To indicate a

signal, WARN should be pulled up to a power source through a resistor. WARN

goes high if the DET voltage exceeds 1.08×VDET-REF. WARN goes low if the DET

voltage drops below 1.06×VDET-REF. WARN indicates the input power distance to the

set supply-voltage level. If MP5512 is disabled by UVLO or EN UVLO, it operates

with high impedance.

PGB

Bus Voltage Power-Good Indicator. PGB is an open-drain output. To indicate a

signal, PGB should be pulled up to a power source through a resistor. PGB goes

high if the FBB voltage exceeds 0.95×VFBB-REF. PGB goes low if the FBB voltage

drops below 0.9×VFBB-REF. If MP5512 is disabled by UVLO or EN UVLO, it operates

with high impedance.

AGND

IC Signal Ground.

DET

Input-Voltage Detection Sense. DET sets the buck-release start voltage when VIN

drops.

11, 28

VIN

Input-Supply Voltage. The MP5512 operates from an unregulated 4V-to-18V input.

Place a 0.1µF ceramic capacitor as close to VIN as possible. A TVS diode at input is

necessary if the VIN voltage spike is high. Refer to the “Selecting Input Capacitor

and TVS” sections.

12, 27

Bus Voltage. VB requires a 22μF-to-47μF ceramic capacitor as close to VB as

possible.

ON/OFF Control. EN enables/disables all internal circuits.

VBO

Source of Internal Isolation MOSFET. Connect the inductor between SW and VBO

for boost and buck operation.

ENCH

Boost Converter ON/OFF Control. ENCH enables/disables the energy-storage

function but does not limit the release function.

ICH

Boost-Mode Charge Switching-Peak Current Adjustment.

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