MP5505 – ENERGY STORAGE AND MANAGEMENT UNIT

MP5505 Rev. 1.01

www.MonolithicPower.com

7

1/12/2015

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PIN FUNCTIONS

QFN20

(3×4mm)

Pin #

Name

I/O

Description

1

DVDT

I

Slew rate control pin for VB voltage during start up. Connect a capacitor from this

pin to GND to program different VB charge up slew rate. Leave it open for the

default soft start time of around 0.9ms from 0V to VIN.

2

TPOR

I

Power-on-reset delay time for VB start up. When VIN and EN are ready and after

this programmable delay time, VB starts to charge up. Connect a capacitor between

this pin and GND to select different delay time. Leave it open for the default power-

on-reset delay time of 0.4ms.

3

ILIM

I

Input current limit setting pin. Connect a resistor between this pin and GND to adjust

the current limit of the input current limiter. This pin cannot be left open.

4

O

5

O

6

EN

I

ON/OFF control pin for MP5505. When EN is pulled low, all the functions of

MP5505 will be disabled, for both input current limiter and charge/release circuitry.

Make sure EN voltage is high during releasing.

7

ENCH

I

ON/OFF control pin for charge and release circuitry. When the ENCH is pulled

down, the release circuitry is disable, note that ENCH needs to be keep high to

achieve energy release.

8

PGND

I/O

Power ground.

9

SW

O

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

between this pin and VBO pin.

10

STRG

O

Storage voltage pin. Connect appropriate storage capacitors for energy storage and

release operation

11

BST

NC

Bootstrap pin for charge and release circuitry. The internal bi-directional switcher

requires the bootstrap capacitor 100nF from this pin to SW pin to supply the high-

side switch driver voltage during releasing.

12

CST

O

High side switch driving voltage storage pin. MP5505 can support energy even

when storage voltage is close to the VB regulated voltage..

13

NC

NC No Connect

14

AGND

I/O

IC Ground

15

FBB

I

Bus Voltage Feedback Sense. Sets the bus voltage release.

16

FBS

I

Storage Voltage Feedback Sense. Sets the storage voltage.

17

ICH

I

Boost-Mode Current Limit Adjustment Pin. This pin cannot be pulled to VCC or

pulled to external voltage source.

18

VBO

O

Internal Boost. The input voltage after passing through input isolation FET.

19

VB

O

Internal Bus Voltage. Requires a 22μF-to-47μF ceramic capacitor as close to this

pin as possible.

20

VIN

I

Input Supply Voltage. The MP5505 operates from an unregulated 2.7V-to-7V input.

Place a 10µF-to-22µF ceramic capacitor as close to the pin as possible.