AME2056 Datasheet, PDF (10/26 Pages) Analog Microelectronics – 1A Single Cell Li-ion

AME
AME2056
1A Single Cell Li-ion
Battery Linear Charger
n Detailed Description
The AME2056 is a linear battery charger designed for single cell lithium-ion batteries. The charger has CC/CV modes
with programmable charging current. Charging current is programmed by an external resistor. No blocking diode or
external sense resistor are required.
State Diagram of A Typical Charge Cycle
A charge cycle starts when the V_CC pin voltage rises above the UVLO threshold. If the voltage at BAT pin is smaller
than 2.9V, the charger is operating in trickle mode. AME2056 supplies 1/10 programmed current to the battery. When
the BAT pin voltage is greater than 2.9V, the charger enters constant-current mode. The charger supplies the pro-
grammed current to the battery. When the voltage at BAT pin approaches the float voltage (4.2V), the charger operates
in constant-voltage mode and the charging current is decreased. A charge cycle is terminated when the charging current
drops below 1/10 programmed current after the float voltage is reached. When the charging current falls below 1/10
programmed charging current for longer than T_TERM (1.8ms), charging is terminated. The AME2056 enters in standby
mode.
V_CC > V_UVLO
& VCE = HIGH
& VCC > VBAT
NO
YES
Shutdown mode
PFET OFF
CHRG=High Impedance
STDBY=HIGH Impedance
If VCC < VUVLO or
VCC < VBAT or
VCE = Low or
VTEMP > 0.8VCC or
V_TEMP < 0.45V_CC
V_BAT < 4.2V
NO
YES
V_BAT > 2.9V
NO
CC mode
YES _{Charge Current=IBAT}
CHRG=Strong pull-down
STDBY=High Impedance
Trickle Charge mode
Charge Current= 0.1 * IBAT
CHRG=Strong pull-down
STDBY=High Impedance
I_Charge < 0.1 * I_BAT
NO
YES
Standy mode
Charge Current=0
CHRG=High Impedance
STDBY=Strong pull-down
VBAT < 4.1V
YES
10
Rev. B.01