AAT2552IRN-CAE-T1 Analogic Tech, AAT2552IRN-CAE-T1 Datasheet - Page 16

• Manufacturer Part Number: AAT2552IRN-CAE-T1
• Description: Charge Pumps Total Pwr Solution for Portable App
• Manufacturer: Analogic Tech

Specifications of AAT2552IRN-CAE-T1

• Package / Case: TDFN-16 EP
• Mounting Style: SMD/SMT
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

be high (internally pulled down). When the battery is
connected to the BAT pin, the charger checks the condi-
tion of the battery and determines which charging mode
to apply. If the battery voltage is below V
begins battery pre-conditioning by charging at 10% of
the programmed constant current; e.g., if the pro-
grammed current is 150mA, then the pre-conditioning
current (trickle charge) is 15mA. Pre-conditioning is
purely a safety precaution for a deeply discharged cell
and will also reduce the power dissipation in the internal
series pass MOSFET when the input-output voltage dif-
ferential is at its highest.
Pre-conditioning continues until the battery voltage
reaches V
begins constant-current charging. The current level for
this mode is programmed using a single resistor from
the ISET pin to ground. Programmed current can be set
from a minimum 15mA up to a maximum of 500mA.
Constant current charging will continue until the battery
16
SystemPower
Charge Complete Voltage
MIN
Constant Current Mode
Termination Threshold
(see Figure 1). At this point, the charger
Regulated Current
Trickle Charge and
Voltage Threshold
TM
Figure 1: Current vs. Voltage Profile During Charging Phases.
I = CC / 10
Preconditioning
Trickle Charge
Phase
MIN
, the charger
w w w . a n a l o g i c t e c h . c o m
I = Max CC
Constant Current
Total Power Solution for Portable Applications
Charge Phase
voltage reaches the voltage regulation point, V
the battery voltage reaches V
begins constant voltage mode. The regulation voltage is
factory programmed to a nominal 4.2V (±0.5%) and will
continue charging until the charging current has reduced
to 10% of the programmed current.
After the charge cycle is complete, the pass device turns
off and the device automatically goes into a power-sav-
ing sleep mode. During this time, the series pass device
will block current in both directions, preventing the bat-
tery from discharging through the IC.
The battery charger will remain in sleep mode, even if
the charger source is disconnected, until one of the fol-
lowing events occurs: the battery terminal voltage drops
below the V
or the charging source is reconnected. In all cases, the
charger will monitor all parameters and resume charging
in the most appropriate mode.
RCH
threshold; the charger EN pin is recycled;
PRODUCT DATASHEET
Constant Voltage
Charge Phase
AAT2552178
BAT
, the battery charger
2552.2009.01.1.3
BAT
. When