MAX1874 Maxim, MAX1874 Datasheet - Page 15

• Manufacturer Part Number: MAX1874
• Description: Dual-Input / USB/AC Adapter / 1-Cell Li+ Charger with OVP and Thermal Regulation
• Manufacturer: Maxim

Figure 5. Partial-Battery Load Switching. AC adapter power is routed directly to the battery, but USB power is not. When USB power
is connected, total USB current is limited to that set by USEL and system power is drawn from the battery through D5.
TRANSISTOR COUNT: 4997
PROCESS: BICMOS
Li+ Charger with OVP and Thermal Regulation
CHARGING UP TO 6.0V
OVP UP TO 18V
25V CERAMIC
4.7µF
______________________________________________________________________________________
C5
0.055Ω, -20V
Chip Information
FDN302
Dual-Input, USB/AC Adapter, 1-Cell
Q2
10V CERAMIC
USB INPUT
6.3V CERAMIC
1µF
C2
TO REF
4.7µF
1kΩ
R2
C1
10V CERAMIC
2.2µF
DC
DCOK
DCLV
UOK
USB
DCI
C4
250mΩ
400mΩ
BYP
MAX1874
REGULATOR
PGND
THRM
USEL
BATT
CHG
GND
PON
REF
EN
(MBR0520L)
SCHOTTKY
500mA,
C3
2.2µF
6.3V CERAMIC
D2
C6
0.1µF
10V CERAMIC
500mA
100mA
Q3
FDN302
0.055Ω, -20V
R4
10kΩ
NTC
THERMISTOR
10kΩ AT +25°C
Li+
CELL
D5
500mA,
SCHOTTKY
(MBR0520L)
TO BYP
TO SYSTEM
LOAD
R7
3kΩ
D4
LED
15