MC34673AEP datasheet(11/22 Pages) FREESCALE

Part #	MC34673AEP

Description	High Input Voltage 1.2A Charger for Single-cell Li-Ion Batteries

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Manufacturer	FREESCALE [Freescale Semiconductor, Inc]

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Analog Integrated Circuit Device Data

Freescale Semiconductor

11

34673

FUNCTIONAL DESCRIPTION

INTRODUCTION

FUNCTIONAL DESCRIPTION

INTRODUCTION

The MC34673 is a fully-integrated Li-Ion and Li-Polymer

battery charger in a tiny package. It uses current, voltage and

temperature control loops to regulate the charge current. It

has up to 28V input voltage rating, which makes the handheld

device safe even when connected to a wrong AC adapter.

The MC34673 requires only two external capacitors and

one resistor to build a fully functional charger for space-

limited applications such as PDAs, cell phones, portable

video game players and digital still cameras. Its ultra high-

accuracy (

±0.7%) output voltage and temperature-limited

charging current offer additional battery safety during

charging.

The CC-mode current can be programmed with an

external resistor (RISET). The voltage across this resistor is

proportional to the charge current, so the system can monitor

the charge current during the whole charge cycle. The EOC

current threshold is preset to 10% of the CC-mode current.

For a deeply discharged battery with a voltage lower than

2.7V, the MC34673 charges the battery with a trickle-mode

current, which is 20% of the CC-mode current.

Three indication outputs make it easy to report the input

power status and the charge status to MCUs, or users via

LEDs.

FUNCTIONAL PIN DESCRIPTION

INPUT SUPPLY (VIN)

The supply input. This pin should be bypassed to ground

with a 1.0µF capacitor.

POWER PRESENT INDICATOR (PPR)

Open-drain logic output to indicate the input power status.

The PPR-pin output is only determined by the input voltage,

not other conditions such as the EN pin input. The output is

low if VIN is higher than VPOR. This pin is capable to sink at

least 12.0mA current to drive a LED indicator.

CHARGE INDICATOR (CHG)

Open-drain logic output to indicate the charge status. The

output is low when the MC34673 is charging, until the EOC

conditions are reached. This pin is capable to sink at least

12.0mA current to drive a LED indicator.

ENABLE (EN)

Active-low enable logic Input. This pin is internally pulled

to ground by a weak current source. When left floating, the

charger is enabled. Pulling this pin to high voltage externally

disables the charger.

GROUND (GND)

Ground.

FAST CHARGE INDICATOR (FAST)

When charging, this open-drain logic output indicates

whether or not the battery voltage is higher than the trickle-

mode threshold. This pin is capable to sink more than 0.3mA

current. When the charger is on, this pin outputs a logic low

signal if the battery voltage is higher than the trickle-mode

threshold. When the charger is in the shutdown mode or in

any fault conditions, this pin outputs high-impedance.

CC-MODE CURRENT SETTING AND CHARGE

CURRENT MONITOR (ISET)

The CC-mode current, ICHG, is programmed by connecting

a resistor, RISET, between this pin and the ground. When

charging in the CC-mode, the voltage at this pin is 1.0V. The

voltage reduces proportionally as the charge current reduces

in the CV-mode. During the whole charge cycle, the voltage

at this pin can be used to monitor the charge current using the

following equation:

equ. 1

where IBAT is the actual charge current, ICHG is the

programmed CC-mode current, and VISET is the voltage of

the ISET pin during the whole charge cycle.

CHARGER OUTPUT (BAT)

Charger output pin. Connect this pin to the battery being

charged. Bypass to ground with a 2.2µF or higher capacitor.

EXPOSED PAD (EPAD)

Exposed pad. Must be soldered on the large ground plane

on the PCB to enhance the thermal conductivity. The pad

must be connected to GND electrically.

I

BAT

V

ISET

1.0V

--------------- I

CHG

⋅

=

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