L6924D

2/5

CD00061067

However, when a current-limited adapter is used, the device works in Quasi Pulse Mode thanks to its low

input voltage. The device has an operating input voltage ranging from 2.5V to 14V. On the L6924D is

possible to select the output voltage (4.1V-4.2V) with ±1% voltage accuracy.

This allows to use both coke and graphite anode cells. The L6924D offers two open collector outputs, for

diagnostic purpose, which can be used to drive two external LEDs, or to communicate with a host

microcontroller.

Moreover, the voltage across the resistor connected between IEND and GND gives the status about the

charging current (working as a gas gauge) and some eventual faults, like battery over temperature, the

battery absence and the over time charge.

Figure 1.

Basic Application Diagram

Figure 2.

Demo Board Layout

SHDN

ON

OFF

GND

V

OPRG

I

PRE

T

PRG

V

PRE

I

PRG

I

END

V

OSNS

V

OUT

TH

V

REF

V

INSNS

V

IN

ST1

ST2

L6924D

CHARGER

BATTERY

Li-Ion cell

R3

C2

NTC

C1

C3

SHDN

ON

OFF

GND

V

OPRG

I

PRE

T

PRG

V

PRE

I

PRG

I

END

V

OSNS

V

OUT

TH

V

REF

V

INSNS

V

IN

ST1

ST2

L6924D

CHARGER

BATTERY

Li-Ion cell

R3

C2

NTC

C1

C3