LTM8062IV#PBF Linear Technology, LTM8062IV#PBF Datasheet - Page 8

• Manufacturer Part Number: LTM8062IV#PBF
• Description: IC, BATT CHRG, Li-Ion, Li-Polymer, 2A, LGA77
• Manufacturer: Linear Technology

Specifications of LTM8062IV#PBF

• Battery Type: Li-Ion, Li-Polymer
• Input Voltage: 32V
• Battery Charge Voltage: 14.4V
• Charge Current Max: 2A
• Battery Ic Case Style: LGA
• No. Of Pins: 77
• No. Of Series Cells: 1

LTM8062
BLOCK DIAGRAM
OPERATION
The LTM8062 is a complete monolithic, mid-power, power
tracking battery charger, addressing high input voltage ap-
plications with solutions that use a minimum of external
components. The product can be programmed for float
voltages between 3.3V and 14.4V with just two external
resistors, operating under a 1MHz fixed frequency, average
current mode step-down architecture. A 2A power Schottky
diode is integrated within the μModule for reverse input
voltage protection. A wide input range allows the operation
to full charge from an input voltage up to 32V. A precision
threshold on the RUN pin allows the implementation of
a UVLO feature by using a simple resistor network. The
charger can also be put into a low current shutdown mode,
in which the input supply bias is reduced to only 15μA.
The LTM8062 employs an input voltage regulation loop,
which reduces charge current if a monitored input volt-
age falls below a programmed level at the V
There is a 1% 100k resistor to GND at this pin. When the
LTM8062 is powered by a solar panel, the input regulation
8
V
RUN
ADJ
TMR
NTC
INREG
V
0.1µF
INA
100k
0.1µF
COMPENSATION
INTERNAL
GND
V
IN
MANAGEMENT
CONTROLLER
CURRENT
BATTERY
MODE
INREG
pin.
FAULT
loop is used to maintain the panel at peak output power.
The LTM8062 automatically enters a battery precondition
mode if the sensed battery voltage is very low. In this
mode, the charge current is reduced to 300mA. Once the
battery voltage climbs above the internally set precondition
threshold (2.3V at the ADJ pin), the μModule automati-
cally increases the maximum charge current to the full
programmed value.
The LTM8062 can use a charge current based C/10 termina-
tion scheme, which ends a charge cycle when the battery
charge current falls to one-tenth the programmed charge
current. The LTM8062 also contains an internal charge cycle
control timer, for timer-based termination. When using the
internal timer, the charge cycle can continue beyond the
C/10 level to top-off the battery. The charge cycle terminates
when the programmed time elapses, about three hours for
a 0.68µF timer capacitor. The CHRG status pin continues
to signal charging at a C/10 or greater rate, regardless of
which termination scheme is used. When the timer-based
CHRG
8.2µH
RESISTOR
SENSE
10µF
BIAS
ADJ
BAT
8062 BD
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