AS3687 datasheet(15/55 Pages) AMSCO

15 / 55 page

AS3687/87XM

Datasheet

www.austriamicrosystems.com/AS3687

1v3-4

14 - 54

Figure

13 – Charge Pump Pin Connections

Charge Pump

1:1, 1:1.5, 1:2

150mA

Battery

VBAT

C2_P

500nF

C2_N

C1_P

500nF

C1_N

CPOUT

1µF

1.0µF

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

Table

5 – Charge Pump External Components

Symbol

Parameter

Min

Typ

Max

Unit

Note

External Decoupling

Capacitor

1.0

µF

Ceramic low-ESR capacitor between

pins VBAT and VSS.

C3, C4

External Flying

Capacitor (2x)

500

Ceramic low-ESR capacitor between

pins C1_P and C1_N, between pins

C2_P and C2_N and between VBAT

and VSS.

External Storage

Capacitor

1.0

µF

Ceramic low-ESR capacitor between

pins CP_OUT and VSS, pins

CP_OUT and VSS. Use nominal 1µF

capacitors (size 0603)

Note:

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

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

Table

6 – Charge Pump Characteristics

Symbol

Parameter

Min

Typ

Max

Unit

Note

ICPOUT

Output Current

Continuous

0.0

150

Depending on PCB layout

VCPOUTmax

Output Voltage

5.5

Internally limited, Including output

ripple

Efficiency

Including current sink loss;

ICPOUT < 100mA.

ICP1_1.5

3.4

1:1.5 Mode

ICP1_2

Power Consumption

without Load

fclk = 1 MHz

3.8

1:2 Mode

Rcp1_1

0.57

Ω

1:1 Mode; VBAT >= 3.5V

Rcp1_1.5

Effective Charge Pump

Output Resistance

2.65

Ω

1:1.5 Mode; VBAT >= 3.3V

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