Rainbow-electronics MAX1874 Bedienungsanleitung PDF herunterladen (Seite 15)

MAX1874

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

Li+ Charger with OVP and Thermal Regulation

______________________________________________________________________________________ 15

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

TO REF

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

FDN302

0.055

Ω

, -20V

500mA,

SCHOTTKY

(MBR0520L)

500mA,

SCHOTTKY

(MBR0520L)

FDN302

0.055

Ω

, -20V

TO BYP

Ω

LED

TO SYSTEM

LOAD

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.

Chip Information

TRANSISTOR COUNT: 4997

PROCESS: BICMOS

1 2 ... 10 11 12 13 14 15 16

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