MP5507E

– 7V, 3A, ENERGY STORAGE AND MANAGEMENT UNIT

MP5507E Rev. 1.0

www.MonolithicPower.com

9

6/29/2016

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© 2016 MPS. All Rights Reserved.

PIN FUNCTIONS

QFN-16 Pin #

Name

Description

1

DVDT

VB voltage slew-rate control. Connect a capacitor from DVDT to AGND to

program the VB charge-up slew rate. Leave DVDT floating for the default soft-start

time (around 0.8ms from 0V to 5V).

2

ILIM

Input current limit setting. Connect a resistor between ILIM and AGND to adjust

the DC limit from VIN to VB. ILIM cannot be left floating. Pull ILIM higher than 1V to

turn off the VIN-to-VB MOSFET. Do not pull ILIM up to a voltage source higher than

the maximum of VIN and VB.

3

PGB

VB power good indicator. PGB is an open-drain output. PGB goes high if the FBB

4

DISC

On/off control for the VIN-to-VB isolation FET. When DISC is pulled down, the

VIN-to-VB isolation FET is turned off. When DISC is pulled high, the VIN-to-VB

isolation FET is turned on. It is recommended to pull DISC up to VIN through a 100k

resistor for automatic start-up.

5

ENCH

On/off control for the charge/release circuitry. When ENCH is pulled down, the

charge/release circuitry is disabled. ENCH must be kept high to achieve energy

release.

6

PGND

Power ground.

7

SW

Switch output for the charge/release circuitry. Connect a small inductor between

SW and VBO.

8

STRG

Storage voltage. Connect the appropriate storage capacitors for energy storage

and release operation.

9

BST

Bootstrap for the charge/release circuitry. The internal bidirectional switcher

requires a bootstrap capacitor (typically 100nF) from BST to SW to supply high-side

switch-driver voltage during release.

10

CST

High-side switch driving voltage storage. CST is charged by the storage power

when the storage voltage is high and supports driver voltage when the storage

voltage drops close to the VB regulated voltage.

11

AGND

IC signal ground.

12

FBB

Bus voltage feedback sense. FBB sets the bus release voltage.

13

FBS

Storage voltage feedback sense. FBS sets the storage voltage.

14

VBO

Source of internal isolation FET. Connect the inductor between SW and VBO for

boost and buck operation.

15

VB

Bus voltage. A 22

μF to 47μF ceramic capacitor is required as close to VB as

possible.

16

VIN

Input supply voltage. The MP5507E operates from an unregulated 2.7V to 7V

input. Place a ceramic capacitor 0.1µF or larger as close to VIN as possible. A TVS

diode at the input is necessary if the VIN voltage spike is high. Refer to the

Selecting the Input Capacitor and TVS section on page 14 for additional details.