MIC79110 Datasheet, PDF (1/12 Pages) Micrel Semiconductor – Simple 1.2A Linear Li-Ion Battery Charger

MIC79110
Micrel
MIC79110
Simple 1.2A Linear Li-Ion Battery Charger
General Description
The Micrel MIC79110 is a simple and accurate lithium ion
battery charger. Featuring a built-in pass transistor, precision
programmable current limiting (±5%), and precision voltage
termination (±1.5% over temperature) all in a very small
package, the MIC79110 packs full functionality into a small
space.
Other features of the MIC79110 include two independent
end-of-charge indications, including a digital indication that is
programmable with a resistor-to-ground and an analog cur-
rent output that is proportional to the output current, allowing
for monitoring of the actual charging current. Additional
features include very low dropout (500mV over the tempera-
ture range), thermal shutdown, and reverse polarity protec-
tion. In the event the input voltage to the charger is discon-
nected, the MIC79110 also provides minimal reverse-current
and reversed-battery protection.
Available in both fixed 4.2V and adjustable outputs, the
MIC79110 is offered in the leadless 3mm x 3mm MLF-10 with
an operating junction temperature range of –40˚C to +125˚C.
Features
• Input voltage range: 2.5V to 16V
• High output voltage accuracy of ±0.75% over –5°C to
+60˚C and ±1.5% over temperature
• Current Limit ±5% accurate from –5°C ≤ Tj ≤ + 125°C
• Programmable End-of-Charge Flag
• Analog output proportional to output current
• Adjustable and Fixed 4.2V Output
• Low dropout voltage of 500mV at 700mA load, over
temperature
• 1.2A output current
• Excellent line and load regulation specifications
• Reverse current and reverse battery protection
• Thermal shutdown and current limit protection
• Tiny 3mm × 3mm MLF™-10 package
• Junction Temperature Range: –40°C to +125°C
Applications
• Cellular phones
• PDAs
• Digital cameras
• Camcorders
• MP3 players
• Notebook PCs
• Portable Meters
• Cradle chargers
• Car chargers
• Battery packs
Typical Application
V_IN
SHUTDOWN
ENABLE
4kΩ 167Ω
10kΩ
MIC79110
VIN
BAT
SD
SNS
REOC
DEOC
RSET
ACHG
GND
1kΩ
4.2V_BAT
4.2V
Li-Ion
Cell
MLF and MicroLeadFrame is a trademark of Amkor Technology.
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 [phone] • fax + 1 [phone] • http://www.micrel.com
July 2004
1
M9999-072004