LTC4099 Linear Technology Corporation, LTC4099 Datasheet
LTC4099
Manufacturer Part Number
LTC4099
Description
I2C Controlled USB Power Manager/Charger
Manufacturer
Linear Technology Corporation
Datasheet
1.LTC4099.pdf
(36 pages)
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APPLICATIONS
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TYPICAL APPLICATION
FEATURES
USB
Switching Regulator with Bat-Track
Control Makes Optimal Use of Limited Input Power
I
Status Information
Input Overvoltage Protection
Bat-Track Control of External Step-Down Switching
Regulator Maximizes Effi ciency from Automotive
and Other High Voltage Sources
Instant-On Operation with Low Battery
Optional Overtemperature Battery Conditioner
Improves High Temperature Battery Safety Margin
Ideal Diode Seamlessly Connects Battery When Input
Power is Limited or Unavailable
Full-Featured Li-Ion/Polymer Battery Charger
1.5A Maximum Charge Current with Thermal Limiting
Slew Control Reduces Switching EMI
Ultra-Thin (0.55mm) 20-Lead 3mm 4mm QFN
Media Players
Portable Navigation Devices
Smart Phones
Industrial Handhelds
Portable Medical Instruments
2
C Port for Optimal System Performance and
OVERVOLTAGE
TO μCONTROLLER
PROTECTION
6.2k
I
2
10μF
C Controlled High Effi ciency Battery Charger/
2
V
OVGATE
OVSENS
I
2
BUS
C
0.1μF
CLPROG PROG
USB Power Manager
3.01k
LTC4099
1.02k
TM
GND
Adaptive Output
BATSENS
NTCBIAS
NTC
V
100k
BAT
OUT
SW
T
100k
USB Power Manager/Charger
3.3μH
with Overvoltage Protection
+
Li-Ion
DESCRIPTION
The LTC
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 I
parameters including input current limit, charge current
and fl oat voltage. Several status bits can also be read back
via I
An overvoltage protection circuit guards the LTC4099
from high voltage damage on the low voltage V
The LTC4099 is available in the ultra-thin (0.55mm) 20-lead
3mm 4mm QFN surface mount package.
PowerPath and Bat-Track 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.
4099 TA01a
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
2
2
C.
C port allows digital control of important application
10μF
SYSTEM
LOAD
®
4099 is an I
2
C controlled high effi ciency USB
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
3.3
I
2
Reduced Power Dissipation
3.4
AVAILABLE FOR CHARGING
C Controlled
vs Linear Battery Charger
SWITCHING BATTERY
ADDITIONAL POWER
LINEAR BATTERY
3.5
CHARGER
BATTERY VOLTAGE (V)
CHARGER
3.6
LTC4099
3.7
3.8
V
I
CHARGE
3.9
IN
BUS
= 5V
4
= 1A
4099 TA01b
pin.
1
4099f
4.1
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