mic79110yml Micrel Semiconductor, mic79110yml Datasheet

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mic79110yml

Manufacturer Part Number
mic79110yml
Description
Mic79110 Simple 1.2a Linear Li-ion Battery Charger
Manufacturer
Micrel Semiconductor
Datasheet

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General Description
The Micrel MIC79110 is a simple and accurate lithium ion
battery charger. The part features a built-in pass transistor,
precision programmable current limiting (±5%), and
precision voltage termination (±0.75% over temperature).
The MIC79110 packs full functionality into a small space.
Other features of the MIC79110 include two independent
indicators:
programmable with a resistor to ground, and an analog
current output that is proportional to the output current,
allowing for monitoring of the actual charging current.
Additional features include very low dropout (550mV over
the temperature range), thermal shutdown, and reverse
polarity protection. In the event the input voltage to the
charger is disconnected, 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 10-pin 3mm x 3mm
MLF
–40˚C to +125˚C.
Data sheets and support documentation can be found on
Micrel’s web site at www.micrel.com.
___________________________________________________________________________________________________________
Typical Application
MLF and MicroLeadFrame are registered trademarks of Amkor Technology, Inc.
October 2007
®
with an operating junction temperature range of
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (
a
digital
End-of-Charge
SHUTDOWN
ENABLE
V
signal
IN
MIC79110 Typical Application
that
V
SD
R
R
IN
EOC
SET
MIC79110
is
GND
D
A
SNS
BAT
CHG
EOC
Features
• Input voltage range: 2.5V to 16V
• High output voltage accuracy of ±0.75%
• Current limit ±5% accurate from –5°C ≤ T
• Programmable end-of-charge flag
• Analog output proportional to output current
• Adjustable and fixed 4.2V output
• Low dropout voltage of 550mV at 700mA load, over
• 1.2A max charge current
• Excellent line and load regulation specifications
• Reverse current protection
• Thermal shutdown and current limit protection
• Tiny 10-Pin 3mm × 3mm MLF
• Junction temperature range: –40°C to +125°C
Applications
408
Simple 1.2A Linear Li-Ion Battery Charger
over –5°C to +60˚C
temperature
) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
Cellular phones
PDAs
Digital cameras
Camcorders
MP3 players
Notebook PCs
Portable Meters
Cradle chargers
Car chargers
Battery packs
4.2V
Li-Ion
Cell
4.2V
MIC79110
BAT
®
package
M9999-102507
J
≤ + 125°C

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mic79110yml Summary of contents

Page 1

General Description The Micrel MIC79110 is a simple and accurate lithium ion battery charger. The part features a built-in pass transistor, precision programmable current limiting (±5%), and precision voltage termination (±0.75% over temperature). The MIC79110 packs full functionality into a ...

Page 2

... ADJ 4 BAT 5, 6 VIN 7 ACHG 8 DEOC 9 REOC 10 GND October 2007 Pb-Free Marking MIC79110-4.2YML L942* MIC79110YML L9AA* 10 GND 9 R EOC 8 D EOC 7 A CHG ® (ML) Pin Function Shutdown Input. Logic High = Off; Logic Low = On. Current limit: Sets constant current limit via an external resistor to ground. ...

Page 3

Micrel, Inc. Absolute Maximum Ratings Input Supply Voltage (V ).................................... 0V to 18V IN Shutdown Input Voltage (V) ................................. 0V to 10V Output Voltage (ADJ) .....................................................10V Power Dissipation ...................................Internally Limited Junction Temperature ...............................–40°C to +125°C Electrical Characteristics T = 25°C ...

Page 4

Micrel, Inc. Notes: 1. Exceeding the absolute maximum rating may damage the device. 2. The device is not guaranteed to function outside its operating rating. 3. Dropout Voltage is defined as the input to output differential at which the output ...

Page 5

Micrel, Inc. Typical Characteristics October 2007 5 MIC79110 M9999-102507 ...

Page 6

Micrel, Inc. Typical Characteristics (continued) October 2007 6 MIC79110 M9999-102507 ...

Page 7

Micrel, Inc. Functional Characteristics October 2007 7 MIC79110 M9999-102507 ...

Page 8

Micrel, Inc. Application Information Detailed Description The MIC79110 forms a complete charger for 1-cell Lithium-ion batteries. It includes precision voltage control (0.75% over temperature) to performance and cycle life. All are compatible with common 4.2V Lithium-ion chemistries. Voltages other than ...

Page 9

Micrel, Inc. All lithium-ion batteries take approximately 3 hours to charge with the second stage taking twice as long as the first stage. Some chargers claim to be fast chargers by skipping the second stage and just charges the battery ...

Page 10

Micrel, Inc. October 2007 10 MIC79110 M9999-102507 ...

Page 11

Micrel, Inc. Simple Charger - External Trigger to Reset Charge Cycle reset Reset charge cycle. SD GND RSET Reoc SNS DEOC BAT AEOC VIN The V voltage steps voltage greater than V IN When V is below ...

Page 12

Micrel, Inc. Signal Diagram 1 Vgate October 2007 VSD Vbat set voltage Vbat SD threshold Ibattery Active high DEOC pin 9 Active low DEOC pin 10 12 MIC79110 Vin 2 M9999-102507 ...

Page 13

Micrel, Inc. Auto Top-Off-Charger - Application Circuit Lithium-Ion batteries will begin to lose their charge over time. The MIC79110 can be configured to automatically recharge the battery if the voltage drops below a certain voltage. This minimum voltage is set ...

Page 14

Micrel, Inc. Package Information MICREL, INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA TEL +1 (408) 944-0800 FAX +1 (408) 474-1000 WEB http://www.micrel.com The information furnished by Micrel in this data sheet is believed to be accurate and reliable. ...

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