ETA1918S

www.ETAsolution.com

Outperform with Efficiency

1

2.5A, 3MHz Switching Charger with Dynamic Power Path Management

DESCRIPTION

ETA1918S is a switching Li-Ion battery charger with dynamic power-path control and input current limiting. When a battery is connected,

depending on the battery voltage, the DC-DC switching regulator either pre-conditions, fast-charges the battery or just regulates a system

programming ISET1 or ISET2 pin, depending on the state of the nUSB_DET. One should pull nUSB_DET low, if an USB adapter input is present,

the charge current is set by ISET2; otherwise, it is set by ISET1. When the battery voltage reaches the termination voltage i.e. 4.2V, the

charging path disconnects SYS to BATT. The ETA1918S also includes a dynamic power path when the SYS load current exceeds current limit

through the battery.

FEATURES



Switching Charger with Power Path Management



Up to 95% DC-DC Efficiency





Up to 2.5A Max charging current



Instant on with a dead Battery or no Battery



No battery detection



No External Sense resistor



Programmable USB and AC IN Charging Current

APPLICATIONS



Tablet, MID



Smart Phone



Power Bank

ORDERING INFORMATION

PART

PACKAGE PIN TOP MARK

ETA1918SQ3Q

QFN3X3-16

ETA-42

TYPICAL APPLICATION

2A Switching Charger with Dynamic Power Path

SYS

SW

PGND

IN

BATT

NTC

ISET1

ISET2

nUSB_DET

ENB

SYS

SYSTEM

LOAD

2.2uH

2.2K

2K

Ω

500

Ω

5V INPUT

22uF

10uF

1uF