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SMB135_08

更新时间： 2024-11-11 12:22:31
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SUMMIT 电池开关
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34页 623K
描述
Programmable Switch-mode, USB/AC Input Li Battery Charger with TurboCharge Mode

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SMB135_08 数据手册

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SMB135  
Programmable Switch-mode, USB/AC Input Li+ Battery Charger with  
TurboCharge™ Mode*  
FEATURES & APPLICATIONS  
• Programmable USB/AC Li-Ion battery charger  
• TurboChargeTM Mode: 750mA output from 500mA USB  
• High-efficiency current-mode PWM controller  
INTRODUCTION  
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.  
o
o
750kHz to 1.25MHz switching frequency  
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  
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.  
• Digital programming of all major parameters via I2C  
interface (with several addresses) and non-volatile  
memory  
o
o
o
o
o
Battery voltage set point  
Pre-charge, fast charge, termination current  
Fast charge voltage threshold  
Temperature limits  
Automatic restart threshold  
• Status/Fault indicator  
• Stability with ceramic capacitors  
• Wide range of protection features  
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.  
o
o
o
o
Thermal monitor  
Safety timers  
Current limit  
Input/output over-voltage lockout  
Applications  
• GSM Handsets  
• UMTS Handsets  
• Portable Media & Gaming Players  
• Digital camcorders/still cameras  
• Handheld GPS/PDAs  
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  
6.8uH  
SMB135  
OUT  
IN  
10uF  
4.7uF  
VDDCAP  
500-700mA  
1uF  
SENSEH  
SENSEL  
50-100mΩ  
4.35V-6.5V  
GND  
SDA  
BATT  
RLIM  
D+  
SCL  
USB  
Li-Ion  
Controller  
USB500/100  
D-  
LED  
THERM  
EN  
VDC  
STAT  
GND  
ADC+  
ADC-  
COMP  
Ccomp  
Rcomp  
Figure 1 – Applications block diagram featuring the SMB135 programmable switch-mode battery charger.  
* Patent Pending  
757 North Mary Avenue • Sunnyvale CA 94085 • Phone 408 523-1000 • FAX 408 523-1266  
© SUMMIT Microelectronics, Inc. 2006 • http://www.summitmicro.com/  
2106 3.1111/4/2008  
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