AS3658F-BCTP datasheet(48/158 Pages) AMSCO

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AS3658

Data Sheet Confidential - Detail ed Descri ption-Power Management Functions

Figure 17. Step down charger Efficiency (Measured) VSupply=4.4V

8.7.1 External Step Down/Linear Charger Characteristics

The battery charge controller controls the external Step Down/ Linear charger.

During Trickle charge of the deeply discharged battery the step down/Linear converter regulates the Vsupply to Vchlimit.

In step down charger mode, If the VBAT voltage exceeds ResVoltRise, the internal battery switch is switched on, the

Vsupply voltage drops down to VBAT immediately, and the step down converter operates as controlled current source

to Vsupply. The battery current is regulated to the value defined in ConstantCurrent register.

In linear charger mode, the Vsupply is still regulated to Vchlimit, if the VBAT voltage exceeds ResVoltRise. The current is

regulated by the battery switch to the value defined in the constant current register.

In EOC operation (see Battery Charge Controller on page 51), the operation of the charger depends on the bit

isolate_battery:

If isolate_battery = 1 and EOC the output is regulated to Vchlimit.

If isolate_battery = 0 and EOC the output is not allowed to drop below VEOC (3.6V).

CVSUPPLY

Minimum total

capacitance parallel to

Vsupply

22µF± 20%, X5R or X7R dielectric

10 µH inductor

47µF± 20%, X5R or X7R dielectric

22 µH inductor

Table 39. Step down Charger parameters

Symbol

Parameter

Min

Typ

Max

Unit

Note

Vrsense_max

Current limit voltage at

Rsense

100

130

e.g.: 1.4A for 0.07O sense

resistor typ.

Cout_10

Output capacitor with 10µH

inductor

µF

X7R ceramic

Table 38. Charger External Components

Symbol

Component

Value

Note

Step down charger

100

0,0000

0,2000

0,4000

0,6000

0,8000

1,0000

1,2000

Output current (A)

Vcharger=5V, f=550kHz

Vcharger=6V, f=550kHz

Vcharger=12V, f=550kHz

Vcharger=5V, f=275kHz

Vcharger=6V, f=275kHz

Vcharger=12V, f=275kHz

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