LTC4054LES5-4.2#PBF Linear Technology, LTC4054LES5-4.2#PBF Datasheet - Page 10

• Manufacturer Part Number: LTC4054LES5-4.2#PBF
• Manufacturer: Linear Technology
• Type: Battery Chargerr

Specifications of LTC4054LES5-4.2#PBF

• Battery Type: Li-Ion
• Output Current: 0.01 to 0.15A
• Output Voltage: 4.2V
• Operating Supply Voltage (min): 4.25V
• Operating Supply Voltage (max): 6.5V
• Operating Temp Range: -40C to 85C
• Package Type: TSOT-23
• Mounting: Surface Mount
• Pin Count: 5
• Operating Temperature Classification: Industrial
• Lead Free Status / RoHS Status: Compliant

OPERATIO
LTC4054L-4.2
Manual Shutdown
At any point in the charge cycle, the LTC4054L can be put
into shutdown mode by removing R
PROG pin. This reduces the battery drain current to less
than 2 A and the supply current to less than 50 A. A new
charge cycle can be initiated by reconnecting the program
resistor.
In manual shutdown, the CHRG pin is in a weak pull-down
state as long as V
conditions. The CHRG pin is in a high impedance state if
the LTC4054L is in undervoltage lockout mode: either V
is within 100mV of the BAT pin voltage or insufficient
voltage is applied to the V
10
U
CC
is high enough to exceed the UVLO
CC
pin.
PROG
thus floating the
CC
Automatic Recharge
Once the charge cycle is terminated, the LTC4054L con-
tinuously monitors the voltage on the BAT pin using a
comparator with a 2ms filter time (t
cycle restarts when the battery voltage falls below 4.05V
(which corresponds to approximately 80% to 90% battery
capacity). This ensures that the battery is kept at or near
a fully charged condition and eliminates the need for
periodic charge cycle initiations. CHRG output enters a
strong pull-down state during recharge cycles.
RECHARGE
). A charge
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