AS3658F-BCTP datasheet(17/158 Pages) AMSCO

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AS3658

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

Figure 4. DC/DC step-up Converter 2

Table 5. DC/DC Converter parameters

Symbol

Parameter

Min

Typ

Max

Unit

Note

IVDD

Quiescent Current

140

µA

Pulse skipping mode

VFB1

Feedback voltage for external

resistor divider:

1.20

1.25

1.30

for constant voltage control

VFB2

Feedback voltage for current

sink regulation

0.5

DCDC_CURR1, DCDC_CURR2

or DCDC_CURR3

IDCDC_FB

Additional tuning current at

DCDC_FB

031

µA

adjustable by software in 1µA

steps

Accuracy of feedback current

-5

@ full scale

Vrsense_max Current limit voltage at Rsense

100

E.g.: 0.65A for 0.15

Ω sense

resistor

RSW

switch resistance

ON-resistance of external

switching transistor

Iload

Load current

at 15V output voltage

fIN

Switching frequency

fclk_int/

MHz

internal CLK frequency/2

Programmable: 0.8 to 1.15 MHz

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