AS3675 datasheet(18/81 Pages) AMSCO

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AS3675

Datasheet - D e ta i l e d D e s c r i p t i o n

Figure 14. Charge Pump Pin Connections

The Charge Pump requires the external components listed in the following table:

Note: The connections of the external capacitors C2, C3, C4 and C5 should be kept as short as possible.

The maximum voltage on the flying capacitors C3 and C4 is VBAT.

Table 13. Charge Pump External Components

Symbol

Parameter

Condition

Min

Typ

Max

Unit

External Decoupling

Capacitor

Ceramic low-ESR capacitor between pins

VBAT and VSS.

1.0

µF

C3, C4

External Flying

Capacitor (2x)

Ceramic low-ESR capacitor between pins

C1_P and C1_N, between pins C2_P and

C2_N and between VBAT and VSS

1.0

µF

External Storage

Capacitor

Ceramic low-ESR capacitor between pins

CPOUT and VSS, pins CPOUT and VSS. Use

nominal 2.2µF capacitors (size 0603)

2.2

µF

Table 14. Charge Pump Characteristics

Symbol

Parameter

Condition

Min

Typ

Max

Unit

ICPOUT

Output Current

Continuous

Depending on PCB layout

0.0

300

Output Current

Pulsed

max. 200ms

VCPOUT=

VBAT * CPMODE – ILOAD * RCP

0.0

500

VCPOUTmax

Output Voltage

Internally limited, Including output ripple

5.6

Efficiency

Including current sink loss;

ICPOUT < 100mA.

ICP1_1.5

Power Consumption

without Load

fclk = 1 MHz

1:1.5 Mode

3.4

ICP1_2

1:2 Mode

3.8

Rcp1_1

Effective Charge

Pump Output

Resistance (Open

Loop, fclk = 1MHz)

1:1 Mode; VBAT

≥ 3.5V

0.57

Rcp1_1.5

1:1.5 Mode; VBAT

≥ 3.3V

2.65

Rcp1_2

1:1.2 Mode; VBAT

≥ 3.1V

3.25

fclk Accuracy

Accuracy of Clock

Frequency

-10

AS3675

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