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PDF LTC4099 Data sheet ( Hoja de datos )
| Número de pieza | LTC4099 | |
| Descripción | I2C Controlled USB Power Manager/Charger | |
| Fabricantes | Linear Technology Corporation | |
| Logotipo |  |
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LTC4099
I2C Controlled
USB Power Manager/Charger
with Overvoltage Protection
FEATURES
DESCRIPTION
n Switching Regulator with Bat-TrackTM Adaptive Output
Control Makes Optimal Use of Limited Input Power
n I2C Port for Optimal System Performance and
Status Information
www.DataShneetI4nUp.cuotmOvervoltage 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 Ultra-Thin (0.55mm) 20-Lead 3mm × 4mm QFN
APPLICATIONS
n Media Players
n Portable Navigation Devices
n Smart Phones
n Industrial Handhelds
n Portable Medical Instruments
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 VBUS pin.
The LTC4099 is available in the ultra-thin (0.55mm) 20-lead
3mm × 4mm QFN surface mount package.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
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.
TYPICAL APPLICATION
OVERVOLTAGE
USB PROTECTION
I2C Controlled High Efficiency Battery Charger/
USB Power Manager
VBUS
10μF
SW
VOUT
3.3μH
6.2k
OVGATE
LTC4099
BAT
OVSENS
BATSENS
2
TO μCONTROLLER
NTCBIAS
I2C CLPROG PROG GND NTC
100k
SYSTEM
LOAD
10μF
0.1μF 3.01k 1.02k
100k
T
+
Li-Ion
4099 TA01a
Reduced Power Dissipation
vs Linear Battery Charger
1.8
LINEAR BATTERY
VIN = 5V
1.6
CHARGER
ICHARGE = 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
4099f
1
1 page  
LTC4099
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating temp-
erature range, otherwise specifications are at TA = 25°C. VBUS = 5V, BAT = 3.8V, DVCC = 3.3V, RPROG = 1.02k, RCLPROG = 3.01k, unless
otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Ideal Diode
VFWD
RDROPOUT
IMAX
I2C Port
www.DataShDeVeCt4CU.com
IDVCCQ
VDVCC_UVLO
ADDRESS
Forward Voltage
Internal Diode On-Resistance, Dropout
Diode Current Limit
I2C Logic Reference
DVCC Current
DVCC UVLO
I2C Address
IVOUT = 10mA
IVOUT = 200mA
SCL/SDA = 0kHz
15
0.18
2
1.6 5.5
0.2
1
0001001
⎡
⎣⎢
R
W
⎤
⎦⎥
mV
Ω
A
V
μA
V
VIRQ
IIRQ
VIH, SDA, SCL
IRQ Pin Output Low Voltage
IRQ Pin Leakage Current
Input High Threshold
VIL, SDA, SCL Input Low Threshold
IIH, SDA, SCL
IIL, SDA, SCL
VOL
fSCL
tBUF
Input Leakage High
Input Leakage Low
Digital Output Low (SDA)
Clock Operating Frequency
Bus Free Time Between Stop and Start
Condition
IIRQ = 5mA
VIRQ = 5V
SDA, SCL = DVCC
SDA, SCL = 0V
ISDA = 3mA
0.7 •
DVCC
–1
–1
1.3
65 100
01
0.3 •
DVCC
1
1
0.4
400
mV
μA
V
V
μA
μA
V
kHz
μs
tHD_SDA
tSU_SDA
tSU_STO
tHD_DAT(OUT)
tHD_DAT(IN)
tSU_DAT
tLOW
tHIGH
tSP
Hold Time After (Repeated) Start Condi-
tion
Repeated Start Condition Set-Up Time
Stop Condition Time
Data Hold Time
Input Data Hold Time
Data Set-Up Time
Clock Low Period
Clock High Period
Spike Suppression Time
0.6 μs
0.6 μs
0.6 μs
0 900 ns
0 ns
100 ns
1.3 μs
0.6 μs
50 ns
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: The LTC4099 is guaranteed to meet performance specifications
from 0°C to 85°C. Specifications over the – 40°C to 85°C operating
temperature range are assured by design, characterization and correlation
with statistical process controls.
Note 3: The LTC4099 includes overtemperature protection that is intended
to protect the device during momentary overload conditions. Junction
temperature will exceed 125°C when overtemperature protection is active.
Continuous operation above the specified maximum operating junction
temperature may impair device reliability.
Note 4: Total input current is the sum of quiescent current, IVBUSQ, and
measured current given by:
VCLPROG / RCLPROG • (hCLPROG + 1)
Note 5: The PROG pin always represents actual charge current. See the
Full Capacity Charge Indication (C/x) section.
4099f
5
5 Page 
LTC4099
PIN FUNCTIONS
DVCC (Pin 15): Logic Reference for the I2C Serial Port. A
0.01μF bypass capacitor is required.
SCL (Pin 16): Clock Input for the I2C Serial Port. The I2C
input levels are scaled with respect to DVCC.
SDA (Pin 17): Data Input/Output for the I2C Serial Port.
The I2C input levels are scaled with respect to DVCC.
ACPR (Pin 18): Auxiliary Power Source Present Output
www.DataSh(eAect4tUiv.ceoLmow). ACPR indicates that the output of an external
high voltage step-down switching regulator connected to
WALL is suitable for use by the LTC4099. ACPR may be
connected to the gate of an external P-channel MOSFET
transistor whose source is connected to VOUT and whose
drain is connected to WALL. ACPR has a high level of VOUT
and a low level of GND.
CLPROG (Pin 19): USB Current Limit Program and Monitor
Pin. A 1% resistor from CLPROG to ground determines
the upper limit of the current drawn from the VBUS pin.
A precise fraction of the input current, hCLPROG, is sent
to the CLPROG pin when the high side switch is on. The
switching regulator delivers power until the CLPROG pin
reaches 1.18V. Therefore, the current drawn from VBUS
will be limited to an amount given by hCLPROG and
RCLPROG. There are a multitude of ratios for hCLPROG
available by I2C control, two of which correspond to the
100mA and 500mA USB specifications (see Table 2). A
multilayer ceramic averaging capacitor is also required at
CLPROG for filtering.
OVSENS (Pin 20): Overvoltage Protection Sense Input.
OVSENS should be connected through a 6.2k resistor to
the input power connector and the drain of an external N-
channel MOSFET pass transistor. When the voltage on this
pin exceeds VOVCUTOFF, the OVGATE pin will be pulled to
GND to disable the pass transistor and protect the LTC4099
from potentially damaging high voltage.
Exposed Pad (Pin 21): Ground. The Exposed Pad and pin
must be soldered to the PCB to provide a low electrical
and thermal impedance connection to ground.
4099f
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet LTC4099.PDF ] | |
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