LX2208 データシートの表示（PDF） - Microsemi Corporation

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LX2208

2 Amp Three Level Lithium Ion Battery Charger

Microsemi Corporation 

LX2208

2 Amp Three Level Lithium Ion Battery Charger

®

TM

PRODUCTION DATA SHEET

ABSOLUTE MAXIMUM RATINGS

PACKAGE PIN OUT

Supply Input Voltage (IN, BAT) ...................................................................... -0.3V to 7V

All other pins ............................................................................................-0.3V to VSUPPLY

Battery Charging Current .............................................................................................2.5A

Operating Ambient Temperature Range (TA) ..................................................-40 to 125°C

Maximum Operating Junction Temperature .............................................................. 150°C

Storage Temperature Range.........................................................................-65°C to 150°C

Lead Temperature (Soldering 10 seconds)................................................................. 300°C

Peak Temp. for Solder Reflow (40 seconds maximum exposure).................. 260°C (+0 -5)

Note: Exceeding these ratings could cause damage to the device. All voltages are with respect to

Ground. Currents are positive into, negative out of specified terminal.

THERMAL DATA

LD

Plastic Micro Leadframe Package 12-Pin

THERMAL RESISTANCE-JUNCTION TO AMBIENT, θJA

33°C/W*

Junction Temperature Calculation: TJ = TA + (PD x θJA).

*The θJA numbers are guidelines for the thermal performance of the device/pc-board system. All of

the above assume no ambient airflow. See layout guidelines section for important details.

IN

1

CMP

2

STAT

3

DC OK 4

SD

5

20%

6

12

BAT

11

TMP

10

HCP

9

LCP

8

H/L

7

GND

LD Package

(Top View)

RoHS / Pb-free 100% matte Tin Pin Finish

FUNCTIONAL PIN DESCRIPTION

Name Pin

Description

BAT 12 Output, Battery Connection – This pin is wired to the positive terminal of a single cell Lithium Ion/Polymer battery.

CMP 2 Input, Compensation – Connect a series combination of a 1k resistor and 0.47µF capacitor from IN to CMP.

DC OK 4

Output, Power status logic pin and LED driver – This pin is an open drain output that can sink 10mA of current to

drive an external LED. This pin is low impedance to GND when the IN pin input voltage is high enough to charge

the battery.

GND 7 Common Ground – Used as chip ground and as a reference for the battery return.

Input, High Current Programming and Termination Current Programming – A resistor (RHCP) between this pin and

GND sets the constant current high level. The following relationship determines the charging current of constant

HCP 10

current mode: Typically IBAT=7150/RHCP when H/ L is high. The termination current is set to 1/10 of the HCP

current level, and the conditioning current is set to 1/20 of the HCP current level.

H/ L

8

High or Low load select logic input – A logic high selects the constant charge current level set by the HCP pin

resistor RHCP and a logic low selects the constant charge current level set by the LCP pin resistor RLCP.

IN

1 Input Power – Connect to a wall adapter or a USB port.

Input, Low Current Programming – A resistor (RLCP) between this pin and GND sets the constant current low

LCP 9 level. The following relationship determines the charging current of constant current mode: Typically

IBAT=7150/RLCP when H/ L is low and 20% is high.

SD

5

Input, Shutdown – A logic high places the LX2208 in shut down mode; it can also be used for USB suspend

mode.

Output, Charging status logic pin and LED driver – This pin can source or sink 5mA of current to drive an external

STAT 3 LED in either output state. This pin is low when the battery is in charging mode and becomes high when the

charge cycle is finished. It becomes high impedance when the input power is removed.

Input, Battery Temperature Monitor – This sense pin determines the battery temperature. It is connected to a

TMP 11 resistor network as defined in the application note. When the TMP pin falls below 29% (typ) of VIN or rises above

74% (typ) of VIN it suspends charging. Ground the TMP pin if it is not used.

20%

20% Select logic input – This pin is only monitored when the H/ L pin is low. A logic high on 20% pin selects the

6 constant charge current level set by the LCP pin resistor RLCP. A logic low selects 20% of the constant charge

current level set by the LCP pin resistor RLCP .

Copyright © 2007

Rev. 1.0, 2007-04-03

Microsemi

Analog Mixed Signal Group

11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570

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