LTC4077EDD(RevA) Ver la hoja de datos (PDF) - Linear Technology
Número de pieza
componentes Descripción
Fabricante
LTC4077EDD Datasheet PDF : 16 Pages
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OPERATIOU
Status Indicators
The charge status output (C H R G ) has two states: pull-down
and high impedance. The pull-down state indicates that
the LTC4077 is in a charge cycle. Once the charge cycle
has terminated or the LTC4077 is disabled, the pin state
becomes high impedance. The pull-down state is capable
of sinking up to 10mA.
LTC4077
The power supply status output (PWR) has two states:
pull-down and high impedance. The pull-down state
indicates that power is present at either DCIN or USBIN.
If no power is applied at either pin, the PWR pin is high
impedance, indicating that the LTC4077 lacks sufficient
power to charge the battery. The pull-down state is capable
of sinking up to 10mA.
STARTUP
BAT < 2.9V
DCIN POWER APPLIED
ONLY USB POWER APPLIED
POWER SELECTION
TRICKLE CHARGE
MODE
1/10th FULL CURRENT
CHRG STATE: PULLDOWN
DCIN POWER
REMOVED
USBIN POWER
REMOVED OR
DCIN POWER
APPLIED
TRICKLE CHARGE
MODE
1/2 OR 1/10th FULL CURRENT
CHRG STATE: PULLDOWN
BAT < 2.9V
BAT > 2.9V
BAT > 2.9V
2.9V < BAT
CHARGE
MODE
FULL CURRENT
CHRG STATE: PULLDOWN
IBAT < ITERMINATE
IN VOLTAGE MODE
CHARGE
MODE
FULL CURRENT
CHRG STATE: PULLDOWN
2.9V < BAT
IBAT < ITERMINATE
IN VOLTAGE MODE
BAT < 4.1V
STANDBY
MODE
NO CHARGE CURRENT
CHRG STATE: Hi-Z
STANDBY
MODE
NO CHARGE CURRENT
CHRG STATE: Hi-Z
BAT < 4.1V
EN
DRIVEN LOW
SHUTDOWN
MODE
IDCIN DROPS TO 20 A
CHRG STATE: Hi-Z
EN
DRIVEN HIGH
DCIN POWER
REMOVED
EN
DRIVEN HIGH
USBIN POWER
REMOVED OR
DCIN POWER
APPLIED
SHUTDOWN
MODE
IUSBIN DROPS TO 18 A
CHRG STATE: Hi-Z
EN
DRIVEN LOW
4075 F01
Figure 1. LTC4077 State Diagram of a Charge Cycle
4077fa
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