API9221
Car/Wall or USB Supply Input Lithium Battery Charger
with OVP USB Bypass and 10mA LDO
Description
Pin Assignments
( Top View )
The API9221 has two supply inputs for highly integrated
portable applications, enabling charging from a USB host,
wall adapter, or car adapter.
1
2
3
4
5
6
12
11
10
9
VDC
VDC_LDO
BAT
VUSB
PPR
The
pin indicates to a host controller that a safe and
PPR
USB_BYP
IVDC
Exposed Pad
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
CHG
EN
8
GND
state of charging via the enable pin
. The API9221
7
IUSB
EN
IMIN
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
DFN4030-12
Features
programmable via an external resistor, RIMIN
.
The
pin indicates when the termination current is
CHG
reached, and is reset by
•
•
•
•
•
•
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
, power off, or battery below 3.9V.
EN
The maximum charge current can be programmed
independently via the resistors RIUSB and RIVDC
.
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.
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
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.
Thermal protection
Applications
DFN4030-12: Available in “Green” Molding Compound
(No Br, Sb)
•
•
•
•
•
Handheld Consumer Devices
Cell Phones, PDAs, MP3 Players
Handheld Test Equipment
Digital Still Cameras
•
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.
Multimedia players
Typical Application Circuit
DC Input
VDC_LDO
LDO Output
USB_BYP
VDC
To Battery
USB Input
BAT
VUSB
USB_BYP
PPR
API9221
EN
OFF
ON
To MCU
GND
CHG
IVDC
IMIN
IUSB
I/O_VDD
I/O_VDD
1 of 17
www.diodes.com
May 2010
© Diodes Incorporated
API9221
Document number: DS32204 Rev. 1 - 2
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