LTC4067_15 Datasheet, PDF (1/20 Pages) Linear Technology – USB Power Manager with OVP and Li-Ion/Polymer Charger

LTC4067
USB Power Manager
with OVP and
Li-Ion/Polymer Charger
FEATURES
Programmable Input Current Limit:
■ _{Single Resistor at CLPROG Pin to Set and Monitor}
Input Current
Battery Charger/Ideal Diode/Controller:
■ _{13V Overvoltage Protection}
■ _{Full Featured Battery Charger with 4.2V Float}
■ _{Up to 1.25A Programmable Charge Current}
■ _{Thermal Regulation Maximizes Charge Current}
Without Risk of Overheating
■ _{Internal 2 Hour Termination Timer from Onset of}
Voltage Mode Charging
■ _{Automatic Load Switchover to Battery Power with}
Internal Ideal Diode and Drive Output for Optional
External MOSFET
■ _{NTC Thermistor Input}
■ _{Bad Battery Time-Out Detection}
■ _{4mm × 3mm 12-Lead DFN Package}
U
APPLICATIO S
■ _{Automatic Battery Charging/Load Switchover}
■ _{Backup Battery Charger}
■ _{Uninterrupted Supplies}
, LTC and LT are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
DESCRIPTIO
The LTC^®4067 is a USB power management and Li-Ion/
Polymer battery charger designed for portable battery
powered applications. The part controls total current used
by the USB peripheral for operation and battery charging.
The total input current may be left unregulated, or it may
be limited to 20% or 100% of the programmed value up
to 1.5A (typically 500mA). Battery charge current is au-
tomatically reduced such that the sum of the load current
and the charge current does not exceed the programmed
input current.
With the addition of an external P-channel MOSFET the
LTC4067 can withstand voltages up to 13V.
The LTC4067 includes a complete constant current/con-
stant voltage linear charger for single cell Li-Ion batteries.
The float voltage applied to the battery is held to a tight
0.4% tolerance, and charge current is programmed using
an external resistor to ground. An end-of-charge status
output, ^⎯C^⎯H^⎯R^⎯G, indicates full charge. Also featured is an
NTC thermistor input used to monitor battery temperature
while charging.
The LTC4067 is available in a 12-lead low profile 4mm ×
3mm DFN package.
TYPICAL APPLICATIO
WALL
OR
USB
OVI
OUT
10nF
OVP
I_LOAD
10μF
IN
BAT
1μF
10μF
LTC4067
1-CELL
Li-Ion
I_LIM0
CHRG
I_LIM1
PROG
CLPROG _GND
2k
4067 TA01
I_LIM0 I_LIM1 I_IN(MAX)
L H O (SUSPEND)
L
L 200V/R_CLPROG
2k
H
H 1000V/R_CLPROG
H L FIXED (2A)
OVP Response to Ramp Input at OVI
V_OVI
5V/DIV
5V TO 12V
I_IN
500mA/DIV
V_OUT
5V/DIV
V_OVP
5V/DIV
V_BAT = 4.2V
1ms/DIV
4067 TA01b
4067f
1