SMB135E-470V View Datasheet(PDF) - Summit Microelectronics
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SMB135E-470V
Summit Microelectronics
SMB135E-470V Datasheet PDF : 34 Pages
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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
50-100mΩ
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
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