SMB139 Datasheet, PDF (1/27 Pages) Summit Microelectronics, Inc. – Programmable Linear Battery Charger in 1.3 x 2.1 uCSP

SMB139
Programmable Linear Battery Charger in 1.3 x 2.1 uCSP^TM
FEATURES & APPLICATIONS
INTRODUCTION
• World’s smallest linear charger
• Linear charging for reduced board space
o Up to 210mA charge current *
o Stable with small ceramic capacitors
• 4.35 to 6.5V input voltage range
• Small 1.3 x 2.1 uCSP^TM package (0.4mm pitch)
• High-accuracy output voltage regulation: 1%
• Low reverse leakage current
• Digital programming of all major parameters via I²C
interface and lockable non-volatile memory
o Battery voltage set point
o Pre-charge, fast charge, termination current
o Fast charge voltage threshold
o Temperature limits
o Charge safety timers
o Automatic restart threshold
• Fault/Status indicator
• Wide range of protection features
o Thermal regulation
o Input/output over-voltage lockout
Applications
• Bluetooth & Stereo Headsets
• Noise Cancellation Headphones
• MP3 Players
• Wrist PDA/Watches
• Toys
• Handheld Equipment
The SMB139 is a programmable single-cell lithium-ion/lithium-polymer
battery charger for a variety of portable applications. The device
provides a simple way to charge low-capacity Li-Ion or Li-Polymer
batteries via a USB port or an AC port. Unlike conventional devices,
the SMB139’s very small package and high level of configurability
simplify design in a wide range of handheld equipment.
Charge control includes qualification, trickle-charge, pre-charge,
constant current/constant voltage, and termination/safety settings that
are fully programmable via a serial I2C/SMBus making the device truly
a flexible solution. Pre-charge, fast charge and termination current
levels can be set via I2C commands. The Enable (EN) pin is used for
suspending or re-staring the charging process.
The SMB139 offers a wide variety of features that protect the battery
pack as well as the charger and input circuitry: over-current,
under/over-voltage and thermal protection. Ultra-precise, 1% accurate,
float voltage control improves battery capacity utilization. Status can
be monitored via the serial port for charge state and fault conditions.
In addition, one LED driver output can be used to signal charge status.
As a protection mechanism, when the junction temperature
approaches approximately 110°C, the SMB139 will start to reduce
charge current to ensure device and system reliability, while charging
the battery cell as fast as possible.
The SMB139 is available in a space-saving 1.3mm x 2.1mm uCSP^TM
package with lead-free balls and is rated over the –30°C to +85°C
temperature range.
SIMPLIFIED APPLICATIONS DRAWING
4.35V to 6.5V
10V Tolerance
2.2µF
1µF
Optional
I2C Communication
(Optional)
IN _SMB139
VDDCAP
TRICKLE
SENSE
OUT
SDA
SCL
EN
CHGSET
BATT
THERM
2.2µF
STAT
GND
Up to 210mA
Charge Current
Battery
OVLO
1-cell
Li+ Battery
RLIM
RED
LED
Figure 1 – Applications block diagram featuring the SMB139 programmable linear battery charger.
* Contact factory for higher current version
© SUMMIT Microelectronics, Inc. 2005 • 757 N. Mary Avenue • Sunnyvale CA 94085 • Phone [phone] • FAX [phone]
http://www.summitmicro.com/
2121 3.0 6/19/2008
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