AS3715 datasheet(36/160 Pages) AMSCO

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Page 36

ams Datasheet, Confidential

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[v1-00] 2014-Sep-10

AS3715 − Detailed Description – Power Management Functions

Parameter

Figure 36:

DCDC SU Parameter

DCDC SU Parameter: Shows the key electrical parameter of the DCDC boost converter.

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

IVDD

Quiescent Current

Pulse skipping mode

140

μA

VFB

Feedback voltage for

external resistor divider

For constant voltage control

1.20

1.25

1.30

VCURR

Feedback voltage for

current sink regulation

CURR1, CURR2, CURR3

0.6

IDCDC_FB

Additional tuning current

at FB_SU

Adjustable by software in 1μA

steps

031

μA

Accuracy of feedback

current

@ full scale

-7

Vrsense_

max

Current limit voltage at

Rsense

E.g.: 0.65A for 0.15Ω sense

resistor

100

RSW

Switch resistance

ON-resistance of external

switching transistor

1Ω

Iload

Load current

At 25V output voltage

fIN

Switching frequency

Internal CLK frequency/4,

default 1MHz

fclk_int/4

MHz

tMIN_ON

Minimum ON time

130

MDC

Maximum duty cycle

@ 1MHz

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