API9221 Datasheet, PDF (1/17 Pages) Diodes Incorporated – Car/Wall or USB Supply Input Lithium Battery Charger with OVP USB

API9221
Car/Wall or USB Supply Input Lithium Battery Charger
with OVP USB Bypass and 10mA LDO
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
( Top View )
VDC 1
VUSB ²
PPR 3
CHG ⁴
EN ⁵
IMIN ⁶
Exposed Pad
12 _{VDC_LDO}
11 _BAT
10 USB_BYP
9 IVDC
8 _GND
7 IUSB
DFN4030-12
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
• 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
DC Input
USB Input
OFF
ON
VDC
VUSB
VDC_LDO
BAT
To Battery
API9221 ^USB_BYP
EN
PPR
GND
CHG
IMIN IUSB IVDC
To MCU
I/O_VDD I/O_VDD
LDO Output
USB_BYP
API9221
Document number: DS32204 Rev. 1 - 2
1 of 17
www.diodes.com
May 2010
© Diodes Incorporated