LTC4099_15 Datasheet, PDF (1/36 Pages) Linear Technology – I2C Controlled USB Power Manager/Charger with Overvoltage Protection

LTC4099
I²C Controlled
USB Power Manager/Charger
with Overvoltage Protection
Features
n _{Switching Regulator with Bat-Track™ Adaptive Output}
Control Makes Optimal Use of Limited Input Power
n _I²_{C Port for Optimal System Performance and}
Status Information
n _{Input Overvoltage Protection}
n _{Bat-Track Control of External Step-Down Switching}
Regulator Maximizes Efficiency from Automotive
and Other High Voltage Sources
n _{Instant-On Operation with Low Battery}
n _{Optional Overtemperature Battery Conditioner}
Improves High Temperature Battery Safety Margin
n _{Ideal Diode Seamlessly Connects Battery When Input}
Power is Limited or Unavailable
n _{Full-Featured Li-Ion/Polymer Battery Charger}
n _{1.5A Maximum Charge Current with Thermal Limiting}
n _{Slew Control Reduces Switching EMI}
n _{20-Lead 3mm × 4mm × 0.75mm QFN Package}
Applications
n _{Media Players}
n _{Portable Navigation Devices}
n _{Smart Phones}
n _{Industrial Handhelds}
n _{Portable Medical Instruments}
Description
The LTC^®4099 is an I²C controlled high efficiency USB
PowerPath™ controller and full-featured Li-Ion/Polymer
battery charger. It seamlessly manages power distribution
from multiple sources including USB, a wall adapter and
a Li-Ion/Polymer battery.
The LTC4099 automatically limits its input current for
USB compatibility. For automotive and other high volt-
age applications, the LTC4099 interfaces with an external
switching regulator. Both the USB input and the auxiliary
input controller feature Bat-Track optimized charging to
provide maximum power to the application and reduced
heat in high power density applications.
The I²C port allows digital control of important application
parameters including input current limit, charge current
and float voltage. Several status bits can also be read back
via I²C.
An overvoltage protection circuit guards the LTC4099
from high voltage damage on the low voltage V_BUS pin.The
LTC4099 is available in a 20-Lead 3mm × 4mm × 0.75mm
QFN Package.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of
Linear Technology Corporation. PowerPath, Bat-Track and ThinSOT are trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
Protected by U.S. Patents, including 6522118, 6570372, 6700364, 6819094. Other patents
pending.
Typical Application
OVERVOLTAGE
USB ^PROTECTION
I²C Controlled High Efficiency Battery Charger/
USB Power Manager
V_BUS
10µF
SW
V_OUT
3.3µH
6.2k
OVGATE
LTC4099
BAT
OVSENS
BATSENS
2
TO µCONTROLLER
NTCBIAS
I²C CLPROG PROG GND NTC
100k
0.1µF 3.01k 1.02k
100k
T
+
Li-Ion
SYSTEM
LOAD
10µF
4099 TA01a
Reduced Power Dissipation
vs Linear Battery Charger
1.8
LINEAR BATTERY
V_IN = 5V
1.6
CHARGER
I_CHARGE = 1A
1.4
1.2
ADDITIONAL POWER
1.0 ^{AVAILABLE FOR CHARGING}
0.8
0.6
SWITCHING BATTERY
0.4
CHARGER
0.2
0
3.3 3.4 3.5 3.6 3.7 3.8 3.9
BATTERY VOLTAGE (V)
4 4.1
4099 TA01b
4099fd