www.SiliconStandard.com

7 of 9

SS4036G

1/09/2006 Rev.3.01

CHARGING CONTROL

1k

Ω

3.3k

Ω

10k

Ω

NPN1

CAP

V+

VB+

VDD

VDD

1

GND

8

TEMP

2

V2

7

CCTL

3

V1

6

LED

4

ISENSE

5

U?

SS4036G

Figure 4 shows the linear charger circuit using the

MOSFET which is working in the active region. This

SS4036G. The output of pin CCTL (3) is a pulse-

P-channel MOSFET must be chosen carefully to

width-modulated (PWM) signal. This signal is

handle the required power dissipation.

translated to a DC voltage to control the P-channel

CHARGING STATUS INDICATION

The LED (4) output pin can sink at most 20mA to light up the LED. Table 1 summarizes the operation of this LED pin.

LED pin output

Condition

High

Normal charging

Low

Fully charged

4 Hz square signal

Bad battery, charging continued

Hi-Z

Temperature fault, charging suspended

Figure 4. Charging Control

Table 1. Charging Status

P-channel

MOSFET