Diodes API9221 Manuel d'utilisateur télécharger pdf

API9221

R/WALL or USB SUPPLY INPUT LITHIUM BATTERY

CHARGER with OVP USB BYPASS and 10mA LDO

API9221

Document number: DS32204 Rev. 2 - 2

1 of 15

www.diodes.com

November 2011

NEW PRODUCT

Description

The API9221 has two supply inputs for highly integrated

portable applications, enabling charging from a USB host,

wall adapter, or car adapter.

The

PPR

pin indicates to a host controller that a safe and

valid supply is connected to either VUSB or VDC. The higher

charge current option from VDC will take priority if both

supplies are connected. The host controller can control the

state of charging via the enable pin

. The API9221

implements the constant current/constant voltage (CC/CV)

charge algorithm for Lithium based battery cells. The

connected cell will be charged to 4.2V with an accuracy of

1% over the entire temperature range. The termination

current is programmable via an external resistor, R

IMIN

The

CHG

pin indicates when the termination current is

reached, and is reset by

EN , power off, or battery below

3.9V. The maximum charge current can be programmed

independently via the resistors R

IUSB

and R

IVDC

The API9221 comes with several protection features. To

prevent system damage, the VUSB pin uses over voltage

protection (OVP) at 5.4V, and the VDC OVP is at 6.9V.

Above these levels, the non-operating device is protected

against damage up to 28V. For control and system start-up

the API9221 has a current limited linear regulator.

To protect the chip against excessive power dissipation,

temperature monitoring is integrated, which folds back the

current to a safe level. As the temperature rises, this fold-

back begins at 125°C without completely interrupting

charging.

Applications

• Handheld Consumer Devices

• Cell Phones, PDAs, MP3 Players

• Handheld Test Equipment

• Digital Still Cameras

• Multimedia players

Pin Assignments

Features

• Linear Lithium Ion / Lithium Polymer charging IC

• Supplied from USB host or car/wall adapter

• Overvoltage protection USB: 5.4V, wall:6.9V

• Supply inputs safe up to 28V

• Fast charging with maximum current of 1.2A

• Integrated linear regulator of 4.9V at 10mA with

current limit

• Separate resistor-programmable charging

current for wall and USB

• Resistor programmable end-of-charge

• Current limit on USB bypass path

• Indicator pins for charging and power present

• Enable pin to enable host control charging

• Reverse current protection

• Thermal protection

• U-DFN4030-12: Available in “Green” Molding

Compound

(No Br, Sb)

• Lead Free Finish/ RoHS Compliant (Note 1)

Note: 1. EU Directive 2002/95/EC (RoHS). All applicable RoHS

exemptions applied. Please visit our website at

http://www.diodes.com/products/lead_free.html.

Typical Application Circuit

API9221

OFF

VDC_LDO

PPR

CHG

BAT

GND

USB_BYP

IMIN IUSB IVDC

To Battery

To MCU

IMIN

IUSB

IVDC

USB_BYP

LDO Output

VDC

VUSB

USB Input

DC Input

I/O_VDD

VDC

VUSB

PPR

CHG

IMIN

VDC_LDO

BAT

USB_BYP

IVDC

GND

IUSB

(Top View)

U-DFN4030-12

Exposed Pad

1 2 3 4 5 6 ... 14 15

Résumé du contenu

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Page 8 - CHG goes

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Page 10 - November 2011

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Page 13 - (All Dimensions in mm)

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Diodes API9221 Manuel d'utilisateur

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