Diodes API9221 User Manual
Api9221, New prod uc t description, Applications
API9221
CAR/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
November 2011
© Diodes Incorporated
NEW PROD
UC
T
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
EN
. 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
Typical Application Circuit
API9221
ON
OFF
VDC_LDO
EN
PPR
CHG
BAT
GND
USB_BYP
IMIN
IUSB
IVDC
To Battery
To MCU
R
IM
IN
R
IUSB
R
IV
D
C
USB_BYP
LDO Output
VDC
VUSB
USB Input
DC Input
I/O_VDD
I/O_VDD
VDC
VUSB
PPR
CHG
EN
IMIN
VDC_LDO
BAT
USB_BYP
IVDC
GND
IUSB
(Top View)
U-DFN4030-12
1
2
3
4
5
6
12
11
10
9
8
7
Exposed Pad