MC13883 datasheet(11/64 Pages) FREESCALE

Teilenummer	MC13883

Bauteilbeschribung	Integrated Charger USB Interface

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Hersteller	FREESCALE [Freescale Semiconductor, Inc]

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Power Architecture

MC13883 Technical Data, Rev. 3

Freescale Semiconductor

11

4.2.3

Single-Path Charging

Figure 5. Single-Path Charging Block Diagram

As implied by its name, a single-path charging topology has only one path from the charger to B+. The

phone operates from the voltage at the battery terminals during charge, if the battery is significantly

discharged, the phone will not turn on until the battery has charged to 3.2 V.

There are redundant 1

Ω and 2.2 uF capacitors on the VBUS pin which are required parts for stability

reasons. Each of the 2.2 uF capacitors should be X5R or better with a minimum capacitance of 1.3 uF with

5 volts applied.

The value of a ceramic capacitor is a function of the voltage applied to it. It should be rated for a high

voltage, such as 20 volts to withstand failed chargers.

The selection of devices appropriate for M1 and M2 should be made carefully because of stability issues.

The recommended device for these locations is shown in Table 5.

Table 5. FET Combinations

M1

M2

M4

Combination 1

Si8401

Si8401 or FDZ291P

Combination 2

Si8415

Si8401

Si8401 or FDZ291P

Combination 3

FDZ293P

Si8401 or FDZ293P

B+

0.1

Ω

Battery

CHRGMODE

+

-

OV

Comp

Batt Voltage

Regulator

with Current

Limit and

OV

Protection

+

-

VB[2:0]

Voltage

Error Amp

ICHR

G

[3:0]

Chrg In

Diff Amp

Chrg In

Error Amp

BP Voltage

Regulator

and OV

Protection

VBus (from

mini-USB

connector)

M1

M2

Rs

VBUS

OV_REF

ISENSE

CHRGCTRL

ICHRG_TR[2:0]

+

-

ICHRG

To A/D

Convertor Input

4

3

Trickle

Charge

Control

OV_ENB

+

-

+

-

+

-

OC_

REF

+

-

BP

Ref

Voltage

Error Amp

OC

Comp

Curr Out

Diff Amp

BATTP

BP

FET_CTRL

BP_FET_BIT

BATT_FET_BIT

MC13883 One Chip Charging Block

From Detection

Block

BPFET

FET Switching

Ctrl Logic

BATT_FET

Turnon Signal

to Phone

PWR_ON

R3a

1 Ohm

R3b

1 Ohm

2.2uF

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