AS3685C
Datasheet
Table 2 – Operating Conditions
Symbol
Parameter
Min
Typ
Max
Unit
Note
0.85
mA
1:1 Mode
I OPERATING
Power Consumption without
load
6.6
8.1
mA
mA
1:1.5 Mode
1:2 Mode
5.3 Electrical Characteristics
Table 3 – Charge Pump Characteristics
Symbol
V CPOUT
Parameter
V(VCP) Output voltage
without load – do not short to
VSS
Min
Typ
Max
V BAT *
CP-
mode
Unit
V
Note
CP-mode is 1, 1.5 or 2
(automatically selected)
Output limitation
5.4
5.6
internally limited
0.28
0.53
?
1:1 Mode
V BAT = 3.6V, I CPOUT = 200mA
1:1.5 Mode
R CP
Charge Pump effective
Resistance
1.37
2.00
?
V BAT = 3.3V, I CPOUT = 500mA,
T JUNCTION <=85°C
1:2 Mode
1.95
2.44
?
V BAT = 3.0V, I CPOUT =700mA,
T JUNCTION <=85°C
Eta
V RIPPLE
Efficiency
Output ripple voltage
75
100
93
%
mVpp
Vin=3.0V-4.5V, Iout=100mA
(Charge Pump alone)
Vin=3.0-4.5V, Iout=350mA,
fclk
Operating Frequency
-20%
1.0
+20%
MHz
Mode switching up-debounce
t UP_DEB_LONG
Initial Mode Switching
Debounce Time
256
μ s
time after enabling of the
charge pump or after mode
switching between 1:1 to 1:1.5
t UP_DEB
Mode Switching Debounce
Time
16
μ s
Mode switching up-debounce
time in normal operation
Table 4 – Current Source (Sink) Characteristics
Symbol
I LED
I ACCURACY
Parameter
Output Current Range
Current Setting Accuracy
Min
-10%
Typ
700
500
Max
1000
+10%
Unit
mA
mA
Note
700mA: R ISET = 14.2k ?
1000mA: R ISET = 10k ?
Measured with R ISET = 19.9k ?
and maximum flash current
I INDICATOR
Indicator Current setting
1.0
mA
V ISET
Current Generator Set Point
Voltage (pin ISET)
1.3
V
I ISET = V ISET / R ISET
if the resulting bias current is
I ISET
I FLASH2ISET
Current Generator operating
range
Flash Current to Bias Current
Ratio
10.0
7650
130
μ A
A/A
higher than 200 μ A (typ.), the
current source is disabled
At full flash current
(700mA with R ISET = 14.2k ? )
Mode Switching Threshold on
Data1<7:0>(flash LED current)
V SWITCH
V(ILED) between 1:1 -> 1:1.5
350
400
450
mV
>= 0x80h in flash mode;
and 1:1.5 -> 1:2
I LED >350mA @ R ISET =14.2k ?
www.austriamicrosystems.com/AS3685
(ptr)
1.1
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