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AS3676 Datasheet(PDF) 10 Page - ams AG

Part # AS3676
Description  Flexible Lighting Management
PDF  92 Pages
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Manufacturer  AMSCO [ams AG]
Direct Link  http://www.ams.com
Logo AMSCO - ams AG

AS3676 Datasheet(HTML) 10 Page - ams AG

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AS3676
Datasheet - D e ta i l e d D e s c r i p t i o n
8 Detailed Description
8.1
Analog LDO
The LDO is a general purpose LDO and the output pin connected to VANA/GPI. 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 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 start-up.
Figure 10. Analog LDO Block Diagram
Table 5. Electrical Characteristics
Symbol
Parameter
Condition
Min
Typ
Max
Unit
VBAT
Supply Voltage
Range
3.0
5.5
V
RON
On Resistance
@150mA, full operating temperature range
1.0
VDROPOUT
Dropout Voltage
@150mA
150
mV
@50mA
50
mV
ION
Supply Current
Without load
50
µA
With 150mA load
150
IOFF
Shutdown Current
Without load
100
nA
tstart
Start-up Time
200
µs
Vout_tol
Output Voltage
Tolerance
-3
+3
%
VOUT
Output Voltage
VBAT = 3.0V and IOUT=150mA
1.8
2.85
V
Full Programmable Range;
VBAT > VOUT+ 150mV and IOUT<=150mA
1.8
3.35
V
ILIMIT
1
1. Not production tested – guaranteed by design and laboratory verification
LDO Current Limit
Pin VANA/GPI. LDO acts as current source if
the output current exceeds ILIMIT.
300
450
2
2. During startup of the LDO the current limit is half the value of ILIMIT
mA





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