AS3689 datasheet(9/72 Pages) AMSOSRAM

9 / 72 page

AS3689

austriami crosyst ems

Datasheet, Confidential

www.austriamicrosystems.com (mlg, ptr)

Revision 1.0.2 / 20070115

7 - 70

Figure

7 – Current Sink CURR4x vs. VBAT

0,0

0,5

1,0

1,5

2,0

V(CURR41) [V]

CURR41=38.25mA

CURR41=4.8mA

Figure

8 – RGB Current Sinks RGBx vs. VBAT

Detailed Functional Description

7.1

Analog LDO

The LDO is a general purpose LDO and the output pin is shared with the current source (sink) connected to

RGB3. The design is optimized to deliver the best compromise between quiescent current and regulator

performance for battery powered devices.

Stability is guaranteed with ceramic output capacitors (see Figure 3) of 1µF ±20% (X5R) or 2.2µF +100/-50%

(Z5U). The low ESR of these capacitors ensures low output impedance at high frequencies. The low impedance

of the power transistor enables the device to deliver up to 150mA even at nearly discharged batteries without any

decrease in performance.

The LDO is off by default after startup (apply voltage on VDD_GPIO)

0,0

0,5

1,0

1,5

2,0

V(RGB1) [V]

RGB1=38.25mA

RGB1=4.8mA

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