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SMB135 датащи(PDF) 1 Page - Summit Microelectronics, Inc.

номер детали SMB135
подробное описание детали  Programmable Switch-mode, USB/AC Input Li Battery Charger with TurboCharge Mode
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производитель  SUMMIT [Summit Microelectronics, Inc.]
домашняя страница  http://www.summitmicro.com
Logo SUMMIT - Summit Microelectronics, Inc.

SMB135 датащи(HTML) 1 Page - Summit Microelectronics, Inc.

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SMB135
© 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
Programmable Switch-mode, USB/AC Input Li+ Battery Charger with
TurboCharge™ Mode*
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 TurboCharge
TM 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 I
2C 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 uCSP
TM
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.
Figure 1 – Applications block diagram featuring the SMB135 programmable switch-mode battery charger.
SIMPLIFIED APPLICATIONS DRAWING
FEATURES & APPLICATIONS
* Patent Pending
USB
Controller
D+
D-
VDC
GND
ADC+ ADC-
IN
GND
STAT
R
LIM
LED
6.8uH
SMB135
SENSEH
SENSEL
50-100m
10uF
Li-Ion
THERM
EN
OUT
USB500/100
SDA
BATT
COMP
C
comp
R
comp
VDDCAP
1uF
4.7uF
SCL
500-700mA
4.35V-6.5V


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