AS3689 datasheet(19/72 Pages) AMSOSRAM

19 / 72 page

AS3689

austriami crosyst ems

Datasheet, Confidential

www.austriamicrosystems.com (mlg, ptr)

Revision 1.0.2 / 20070115

17 - 70

Table

9 – Charge Pump Characteristics

Symbol

Parameter

Min

Typ

Max

Unit

Note

ICPOUT_Pulsed

Output Current Pulsed

0.0

400

300ms pulse width,

10% duty cycle max.

ICPOUT

Output Current

Continuous

0.0

350

Depending on PCB layout

VCPOUTmax

Output Voltage

5.5

Internally limited, Including output

ripple

Efficiency

Including current sink loss;

ICPOUT < 400mA.

ICP1_1.5

1:1.5 Mode

ICP1_2

Power Consumption

without Load

fclk = 1 MHz

1:2 Mode

Rcp1_1

0.7

1.5

1:1 Mode; VBAT >= 3.5V

Rcp1_1.5

1.8

3.0

1:1.5 Mode; VBAT >= 3.3V

Rcp1_2

Effective Charge Pump

Output Resistance

(Open Loop, fclk =

1MHz)

3.5

1:1.2 Mode; VBAT >= 3.1V

fclk Accuracy

Accuracy of Clock

Frequency

-10

currlv_switch

RGB1:RGB3,

CURR41:CURR42 and

CURR51:CURR52

minumum voltage

0.2

currhv_switch

CURR1, CURR2,

CURR6 minumum

voltage

0.45

CURR30:CURR33

minumum voltage

0-160mA range

0.2

curr3x_switch

CURR30:CURR33

minumum voltage

>160mA range

0.4

If the voltage drops below this

threshold, the charge pump will use

the next available mode

(1:1 -> 1:1.5 or 1:1.5 -> 1:2)

240

µsec

cp_start_debounce=0

tdeb

CP automatic up-

switching debounce

time

2000

µsec

After switching on CP (cp _on set to

1), if cp_start_debounce=1

7.3.1 Charge Pump Mode Switching

If automatic mode switching is enabled (cp_mode_switching = 00 or cp_mode_switching = 01) the charge pump

monitors the current sinks, which are connected via a led to the output CP_OUT. To identify these current

sources (sinks), the registers cp_mode_switch1 and cp_mode_switch2 (register bits curr30_on_cp …

curr33_on_cp, rgb1_on_cp … rgb3_on_cp, curr1_on_cp, curr2_on_cp, curr41_on_cp … curr43_on_cp) should

be setup before starting the charge pump (cp _on = 1). If any of the voltage on these current sources drops

below the threshold (currlv_switch, currhv_switch, curr3x_switch), the next higher mode is selected after the

debounce time.

To avoid switching into 1:2 mode (battery current = 2 times output current), set cp_mode_switching = 10.

If the currX_on_cp=0 and the according current sink is connected to the chargepump, the current sink will be

functional, but there is no up switching of the chargepump, if the voltage compliance is too low for the current sink

to supply the specified current.

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