Rainbow-electronics MAX1874 Manual do Utilizador descarregar pdf (Página 14)

MAX1874

Dual-Input, USB/AC Adapter, 1-Cell

Li+ Charger with OVP and Thermal Regulation

14 ______________________________________________________________________________________

MAX1874

USB INPUT

OVP UP TO 18V

CHARGING UP TO 6.0V

4.7

25V CERAMIC

4.7

6.3V CERAMIC

2.2

10V CERAMIC

2.2

6.3V CERAMIC

0.1

10V CERAMIC

DCLV

GND

BATT

NTC

THERMISTOR

10k

Ω

AT +25

PON

REF

THRM

USB

400m

Ω

250m

Ω

Li+

CELL

USEL

500mA

100mA

DCI

PGND

BYP

REGULATOR

UOK

CHG

10V CERAMIC

DCOK

10k

Ω

500mA,

SCHOTTKY

(MBR0520L)

FDN302

0.055

Ω

, -20V

FDN302

0.055

Ω

, -20V

TO REF

100k

Ω

301k

Ω

500mA,

SCHOTTKY

(MBR0520L)

TO SYST

LOAD

FDN302

0.055

Ω

, -20V

10k

Ω

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.

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