3. TECHNICAL BRIEF
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3.10 Battery Charger Interface
Figure 3-10-1 BATTERY CHARGER BLOCK
The RT9524 linear battery chargers safely charges single-cell Li+ batteries.
Charging rate is optimized to accommodate the thermal characteristics of a given application.
There is no need to reduce the maximum charge current or worst-case charger power dissipation.
Charging is optimized for Li+ cells using a control algorithm that includes low-battery precharging,
voltage and current-limited fast charging, and top-off charging, while continuously monitoring for input
overvoltage and device over-temperature.
The charge current and termination threshold are programming by simple one wire serial interfaces.
The charger status is indicated by two open-drain outputs.
The AC adapter charger current is programming by external ISET1 resistor while USB charge current is
programming either 90mA or 400mA through one wire interface.
The RT9524 is available in the tiny 10pin 2mm by 3mm TDFN package.
3. TECHNICAL BRIEF
From External Source
(Travel Adaptor or USB)
0.1u
C255
U201
6
5
7
4
8
3
9
2
10
1
11
PGND
VIN
BATT
ISET
PGB
GND1
CHGSB
LDO
GND2
IEOC
EN_SET
1V8_VDD
C223
1u
0.1u
C224
VBUS_USB
1u
C225
VBAT
100K
R211
R227
1.2K
3.9K
R228
CHG_EN
LDO_OUT
_EOC
Ichg=530/Riset=481.8mA
Ieoc=Rieoc/200=19.5%(93.95mA)
(25V)
(10V)
CHARGING IC
From External Source
(Travel Adaptor or USB)