Lowpowersemi LP28009 Schematic [ru]

Preliminary Datasheet LP28009

Single and Dual Cell Li+ Battery Charger IC –LP28009

General Description

The LP28009 is a fully integrated low cost single-cell
Li-Ion battery charger IC ideal for portable applications.
The LP28009 is capable of being powered up from AC
adapter. The LP28009 enters sleep mode when AC adapter
is removed. The LP28009 optimizes the charging task by
using a control algorithm including preconditioning mode,
fast charge mode and constant voltage mode. The charging
task is terminated as the charge current drops below the
preset threshold. The AC adapter charge current can be
programmed up to 1A with an external resister . The inter nal
thermal feedback circuitry regulates the die temperature to
optimize the charge rate for all a mbient temperatures. The
LP28009 features 18V maximum rating voltages for AC
adapter. The other features are under voltage protection,
over voltage protection for AC adapter supply and battery
temperature monito ring.

Order Information

LP28009 - □ □ □ □ □

Package Type
SP: SOP-8(EP)
Output Voltage
42: 4.2V
84: 8.4V

Applications

 Portable Media Players/MP3 players
 Cellular and Smart mobile phone
 PDA/DSC

Bluetooth Applications



Marking Information

Please see website of LP28009:

www.lowpowersemi.com.

F: Pb-Free

Features

z 18V Maximum Rating for AC Adapter
z Internal Integrate P-MOSFETs
z AC Adapter Power Good Status Indicator
z Charge Status Indicator
z Under Voltage Protection
z Over Voltage Protection
z Automatic Recharge Feature
z Battery Temperature Monitoring
z Small 8-Lead SOP(EP) Package
z Thermal Feedback Optimizing Charge Rate
z ROHS Compliant and 100% Lead (Pb)-Free

T ypical Application Circuit

VIN

RED

10uF

VIN

RED

10uF

1

ACIN

2

CHRG_S

3

PGOOD

4

GND

9

GND

LP28009-42SPF

1

ACIN

2

CHRG_S

3

PGOOD

4

GND

9

GND

LP28009-84SPF

BATT

ISETA

BATT

ISETA

8
7

NC

5
6

EN

8
7

NC

5
6

EN

10uF

Q1
LPM9013

10uF

Q8
LPM9013

BATTERY

I/O CTRL

BATT

I/O CTRL

LP28009 – 00 Version. 1.0 Datasheet SEP.-2011 www.lowpowersemi.com Page 1 of 11

Preliminary Datasheet LP28009

Functional Pin Description

Package Type Pin Configurations

1

ESOP- 8

ACIN 8

2

CHG_S

PGOOD

3

LP28009

9
PGND

Pin Description

Pin No Pin Name Pin Function

1 ACIN Wall Adaptor Charge Input Supply.

2 CHG_S Charge Status Indicator Output(Open Drain).

3 PGOOD Power Good Indicator Output(Open drain).

BATT

7

NC

6EN

ISETAGND

54

4 GND Ground.

5 ISETA Wall Adaptor supply charge current Set point.

6 EN Charge Enable Input(active low).

7 NC No Internal Connection.

8 BATT Battery Charge Current Output.

This pin provides charge current to the battery and
regulates the final float voltage to4.2 or8.4V. An
internal precision resistor divider from this pin sets the
float voltage which is disconnected in shutdown mode.

9(Exposed Pad) PGND Exposed Pad Should be soldered to PCB Board and

Connected to GND.

Note: LP28009-42SPF and LP28009-84SPF of Battery (Pin8) is output pin, the pin connector to Battery.

LP28009 – 00 Version. 1.0 Datasheet SEP.-2011 www.lowpowersemi.com Page 2 of 11

Function Block Diagram

Preliminary Datasheet LP28009

LP28009 – 00 Version. 1.0 Datasheet SEP.-2011 www.lowpowersemi.com Page 3 of 11

LP28009-42 Flow Chart

Preliminary Datasheet LP28009

LP28009 – 00 Version. 1.0 Datasheet SEP.-2011 www.lowpowersemi.com Page 4 of 11