MAX1874 データシートの表示（PDF） - Maxim Integrated
部品番号
コンポーネント説明
メーカー
MAX1874
Maxim Integrated
MAX1874 Datasheet PDF : 17 Pages
| |||
Dual-Input, USB/AC Adapter, 1-Cell
Li+ Charger with OVP and Thermal Regulation
OVP UP TO 18V
R2
CHARGING UP TO 6.0V
1kΩ
C5
4.7µF
25V CERAMIC
D1
500mA,
SCHOTTKY
(MBR0520L)
Q2
FDN302
0.055Ω, -20V
Q1
FDN302
0.055Ω, -20V
USB INPUT
R3
10kΩ
C2
1µF
10V CERAMIC
C1
4.7µF
6.3V CERAMIC
TO REF
R5
100kΩ
R6
301kΩ
DC
DCOK
MAX1874
PON
DCLV
BATT
UOK
250mΩ
USB
CHG
400mΩ
USEL
EN
DCI
REGULATOR REF
THRM
BYP
C4
2.2µF
10V CERAMIC
PGND
GND
D2
500mA,
SCHOTTKY
(MBR0520L)
Q3
FDN302
0.055Ω, -20V
TO SYSTEM
LOAD
C3
2.2µF
6.3V CERAMIC
Li+
CELL
500mA
100mA
C6
0.1µF
10V CERAMIC
R4
10kΩ
NTC
THERMISTOR
10kΩ AT +25°C
Figure 4. Full-Featured Circuit. Overvoltage protection MOSFET (Q2) on DC withstands up to 18V from the AC adapter, but disables
charging at inputs over 6.2V. Output switch-over MOSFET (Q3) disconnects the battery from the system load when input power is
applied. The input can power the system through D1, D2, Q1, and Q2 when either USB or AC power is present.
14 ______________________________________________________________________________________
Share Link: 