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Summit Microelectronics

SMB135 Datasheet Preview

SMB135 Datasheet

USB/AC Input Li+ Battery Charger

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SMB135
Programmable Switch-mode, USB/AC Input Li+ Battery Charger with
TurboCharge™ Mode*
FEATURES & APPLICATIONS
INTRODUCTION
Programmable USB/AC Li-Ion battery charger
TurboChargeTM Mode: 750mA output from 500mA USB
High-efficiency current-mode PWM controller
o 750kHz to 1.25MHz switching frequency
o 0% to 100% duty-cycle
4.35 to 6.5V input voltage range
Small 1.3 x 2.1 uCSPTM-15 package (0.4mm pitch)
High-accuracy output voltage regulation: 1%
Low reverse leakage current
Digital programming of all major parameters via I2C
interface (with several addresses) and non-volatile
memory
o Battery voltage set point
o Pre-charge, fast charge, termination current
o Fast charge voltage threshold
o Temperature limits
o Automatic restart threshold
Status/Fault indicator
Stability with ceramic capacitors
Wide range of protection features
o Thermal monitor
o Safety timers
o Current limit
o Input/output over-voltage lockout
Applications
GSM Handsets
UMTS Handsets
Portable Media & Gaming Players
Digital camcorders/still cameras
Handheld GPS/PDAs
The SMB135 is a programmable single-cell lithium-ion/lithium-polymer
battery charger for a variety of portable applications. The device
provides a simple and efficient way to charge high-capacity Li-Ion
batteries via a USB port or an AC adapter. Unlike conventional
devices, the SMB135’s high-efficiency operation eliminates large
internal temperature rise and localized hot spot in handheld equipment.
Summit’s proprietary TurboChargeTM mode allows a 750mA charge
current from a 500mA USB port, resulting to significantly reduced
charge times.
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. Fast charge current level (one or five unit loads)
can be set via I2C or an input pin (USB500/100). An Enable (EN) pin is
also provided for suspending USB charging and allowing the device to
work in parallel with AC charger, which may already be integrated into
a PMIC device. In this case, the SMB135 does not allow current to
flow back to the USB port.
The SMB135 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,
Kelvin-sensed ADOC™ technology allows accurate control of battery
float voltage and 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 or
an under-/over-voltage condition. As a protection mechanism, when
the junction temperature approaches approximately 110°C, the PWM
switcher will start to cut back on the duty cycle, to reduce current.
The SMB135 is available in a space-saving 1.3mm x 2.1mm uCSPTM
package with lead-free balls as well as in a lead-free 5x5 QFN-32
package, and is rated over the -30°C to +85°C temperature range.
SIMPLIFIED APPLICATIONS DRAWING
500-700mA
4.35V-6.5V
4.7uF
1uF
GND
D+ USB
Controller
D-
VDC
ADC+ ADC-
Ccomp
Rcomp
SMB135
IN OUT
VDDCAP
SDA
SCL
USB500/100
EN
COMP
SENSEH
SENSEL
BATT
THERM
STAT
GND
6.8uH
10uF
50-100m
Li-Ion
RLIM
LED
Figure 1 – Applications block diagram featuring the SMB135 programmable switch-mode battery charger.
* Patent Pending
© SUMMIT Microelectronics, Inc. 2006 • 757 North Mary Avenue • Sunnyvale CA 94085 • Phone 408 523-1000 • FAX 408 523-1266
http://www.summitmicro.com/
2106 3.1 11/4/2008
1




Summit Microelectronics

SMB135 Datasheet Preview

SMB135 Datasheet

USB/AC Input Li+ Battery Charger

No Preview Available !

SMB135
GENERAL DESCRIPTION
The SMB135 is a fully programmable battery charger for
single-cell Li-Ion and Li-Polymer battery packs. The
device’s high-efficiency, switch-mode operation reduces
heat dissipation and allows for higher current capability
for a given package size. The SMB135 provides four
main charging phases: trickle-charge, pre-conditioning
(pre-charge), constant current and constant voltage.
The overall system accuracy of the SMB135 is 1%,
allowing for a higher capacity utilization versus other
conventional solutions.
When a battery or an external supply is inserted and the
EN (ENABLE) input is asserted, the SMB135 performs
the pre-qualification checks before initiating a charging
cycle. The input voltage needs to be higher than the
UVLO threshold and the cell temperature needs to be
within the temperature limits for the charging cycle to
start. As soon as the input supply is removed, the
SMB135 enters a shutdown mode, thereby saving
battery power. A programmable option also exists that
allows the user to prevent battery charging until an I2C
command has been issued.
If the battery voltage is below 2.0V (trickle-charge to pre-
charge threshold), the device will apply a trickle-charge
current of 10mA (typical). This allows the SMB135 to
reset the protection circuit in the battery pack and bring
the battery voltage to a higher level without
compromising safety.
Once the battery voltage crosses the 2.0V threshold, the
SMB135 enters the pre-charge mode. This mode
replenishes deeply depleted cells and minimizes heat
dissipation during the initial charge cycle. The
preconditioning current is programmable, with the default
value at C/10. If the battery voltage does not reach the
preconditioning voltage level (programmable) within a
specified amount of time (pre-charge timeout), the safety
timer expires and the charge cycle is terminated.
When the battery voltage reaches the pre-charge to fast-
charge voltage level, the SMB135 enters the constant
current (fast charge) mode. The fast charge current
level is programmable in two ways: a) via an external
sense resistor and b) via the corresponding register.
Once the final float voltage (programmable) has been
reached, the battery charger will enter a constant voltage
mode in which the battery voltage is kept constant,
allowing the charge current to gradually taper off. The
constant-voltage charging mode will continue until the
charge current drops below the termination current
threshold, or until the fast charge timer has expires. The
termination current threshold is programmable from
25mA to 130mA in 15mA increments.
After the charge cycle has terminated, the SMB135
continues to monitor the battery voltage. If the battery
voltage falls below the recharge threshold (typically
115mV below float voltage), the SMB135 can
automatically top-off the battery.
A wide range of protection features is also included in
the SMB135. These include input and output over-
voltage protection, battery missing detector and thermal
monitor for continuous cell temperature monitoring and
pre-qualification.
The following charging parameters can be adjusted
dynamically via the I2C interface, for optimizing battery
management real-time. These parameters can also be
programmed statically via a user-friendly GUI interface:
Battery (float) voltage
Fast charge current
Pre-conditioning voltage threshold
Pre-conditioning charge current
Termination current
Safety charge timers
Temperature window
The SMB135 also offers three programmable PWM
switching frequencies ranging from 750kHz to 1250kHz
in 250kHz increments.
Summit Microelectronics, Inc
2106 3.1 11/4/2008
2


Part Number SMB135
Description USB/AC Input Li+ Battery Charger
Maker Summit Microelectronics
Total Page 30 Pages
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