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LTC4085-4 Datasheet(PDF) 1 Page - Linear Technology

Part # LTC4085-4
Description  USB Power Manager with Ideal Diode Controller and 3.95V Li-Ion Charger
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC4085-4 Datasheet(HTML) 1 Page - Linear Technology

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LTC4085-3/LTC4085-4
1
408534fb
USB Power Manager with
Ideal Diode Controller and
3.95V Li-Ion Charger
The LTC®4085-3/LTC4085-4 is a USB power manager
and Li-Ion/Polymer battery charger designed for portable
battery-powered applications. The part controls the total
current used by the USB peripheral for operation and
battery charging. The total input current can be limited to
20% or 100% of a programmed value up to 1.5A (typically
100mA or 500mA). Battery charge current is automati-
cally reduced such that the sum of the load current and
charge current does not exceed the programmed input
current limit.
The LTC4085-3/LTC4085-4 includes a complete constant-
current/constant-voltage linear charger for single cell Li-Ion
batteries. These 3.95V versions of the standard LTC4085
are intended for applications which have extended battery
lifetime requirements or those that require high temperature
(approximately >60°C) operation or storage. Under these
conditions, a reduced float voltage will trade-off initial cell
capacity for the benefit of increased capacity retention
over the life of the battery. A reduced float voltage also
minimizes swelling in prismatic and polymer cells, and
avoids open CID (pressure fuse) in cylindrical cells.
The LTC4085-3/LTC4085-4 also includes a programmable
termination timer, automatic recharging, an end-of-charge
status output and an NTC thermistor.
Portable USB Devices
Seamless Transition Between Input Power Sources:
Li-Ion/Polymer Battery, USB and 5V Wall Adapter
215mΩ Internal Ideal Diode Plus Optional External
Ideal Diode Controller Provide Low Loss PowerPath
When Wall Adapter/USB Input Not Present
Load Dependent Charging Guarantees Accurate
USB Input Current Compliance
3.95V Float Voltage Improves Battery Life Span and
High Temperature Safety Margin
Constant-Current/Constant-Voltage Operation with
Thermal Feedback to Maximize Charging Rate without
Risk of Overheating*
Selectable 100% or 20% Input Current Limit
(e.g., 500mA/100mA)
Battery Charge Current Independently Programmable
Up to 1.2A
Automatic Output Undervoltage Charge Current
Reduction (LTC4085-3)
Tiny (4mm
× 3mm × 0.75mm) 14-Lead DFN Package
Input and Battery Current vs Load Current
RPROG = 100k, RCLPROG = 2k
FEATURES
DESCRIPTION
APPLICATIONS
TYPICAL APPLICATION
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
Bat-Track, PowerPath 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, 6700364. Other patents pending.
ILOAD (mA)
0
600
500
400
300
200
100
0
–100
300
500
408534 TA01b
100
200
400
600
ILOAD
IIN
IBAT
(CHARGING)
IBAT
(DISCHARGING)
WALL = 0V
IN
SUSP
HPWR
PROG
CLPROG
NTC
VNTC
WALL
ACPR
OUT
GATE
BAT
CHRG
TIMER
LTC4085-3/
LTC4085-4
GND
+
0.1μF
4.7μF
TO LDOs,
REGs, ETC
10k
10k
2k
100k
5V WALL
ADAPTER
INPUT
5V (NOM)
FROM USB
CABLE VBUS
4.7μF
SUSPEND USB POWER
100mA 500mA SELECT
1k
510Ω
408534 TA01
*
* OPTIONAL - TO LOWER
IDEAL DIODE IMPEDANCE
IIN
ILOAD
IBAT


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