AS3685B datasheet(5/25 Pages) TAOS

5 / 25 page

AS3685A/AS3685B

Datasheet

www.austriamicrosystems.com/

AS3685

(ptr)

Revision 2.2

4 - 24

Table

2 – Operating Conditions

Symbol

Parameter

Min

Typ

Max

Unit

Note

0.85

1:1 Mode

6.6

1:1.5 Mode

IOPERATING

Power Consumption without

load

8.1

1:2 Mode

5.3 Electrical Characteristics

Table

3 – Charge Pump Characteristics

Symbol

Parameter

Min

Typ

Max

Unit

Note

V(VCP) Output voltage

without load – do not short to

VSS

VBAT *

CP-

mode

CP-mode is 1, 1.5 or 2

(automatically selected)

VCPOUT

Output limitation

5.4

5.6

internally limited

0.28

0.53

Ω

1:1 Mode

VBAT = 3.6V, ICPOUT = 200mA

1.37

2.00

Ω

1:1.5 Mode

VBAT = 3.3V, ICPOUT = 500mA,

TJUNCTION<=85°C

RCP

Charge Pump effective

Resistance

1.95

2.44

Ω

1:2 Mode

VBAT = 3.0V, ICPOUT=700mA,

TJUNCTION<=85°C

Eta

Efficiency

Vin=3.0V-4.5V, Iout=100mA

(Charge Pump alone)

VRIPPLE

Output ripple voltage

100

mVpp

Vin=3.0-4.5V, Iout=350mA,

fclk

Operating Frequency

-20%

1.0

+20%

MHz

tUP_DEB_LONG

Initial Mode Switching

Debounce Time

256

μs

Mode switching up-debounce

time after enabling of the

charge pump or after mode

switching between 1:1 to 1:1.5

tUP_DEB

Mode Switching Debounce

Time

μs

Mode switching up-debounce

time in normal operation

Table

4 – Current Source (Sink) Characteristics

Symbol

Parameter

Min

Typ

Max

Unit

Note

ILED

Output Current Range

700

1000

700mA: RISET = 14.2kΩ

1000mA: RISET = 10kΩ

IACCURACY

Current Setting Accuracy

-10%

500

+10%

Measured with RISET = 19.9kΩ

and maximum flash current

VISET

Current Generator Set Point

Voltage (pin ISET)

1.3

IISET

Current Generator operating

range

10.0

130

μA

IISET = VISET / RISET

if the resulting bias current is

higher than 200

μA (typ.), the

current source is disabled

IFLASH2ISET

Flash Current to Bias Current

Ratio

7650

A/A

AS3685A, EN1=1, EN2=1 or

AS3685B at full flash current

(700mA with RISET = 14.2kΩ)

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