User guide

17
11050A–PMAAC–07-Apr-10
AT73C246
9.6 LDO3
Unless otherwise specified: External components C
OUT
=10µF, C
IN
=10μF, T
J
= [-40°C ; +125°C].
Notes: 1. Current consumption in V
IN3
without load.
2. Default output voltage are set during manufacturing. Please contact Atmel for other default settings.
3. Threshold level is programmed in register PMU_RST_LVL (0x04)
4. V
DROPOUT
= V
IN3
- V
DD3
when V
DD3
= 98% of V
DD3
obtained with V
IN3
> V
DD3
+ 300mV
Table 9-7. LDO3 Electrical Characteristics
Symbol Parameter Comments Min Typ Max Units
V
IN
Operating Supply Voltage V
IN3
2.9 3.6 5.5 V
I
DD
Supply Current
(1)
OFF - - 1 µA
ON - - 350 µA
I
O
Output Current V
IN3
> V
DD3
+ 300mV. - - 200 mA
V
DD3
Default Output Voltage
(2)
-3.3- V
V
DD_RANGE
Programmable Output Voltage
Range
2.7 3.6 V
V
DD_STEP
Output Voltage Steps 50 mV
T
STEP
Step time With automatic ramping. 570 600 630 µs
V
DD_ACC
DC Output Voltage Accuracy
V
IN3
> V
DD3
+ 300mV
T
J
= 25°C ; I
O
= 0 mA
-1 1
%
V
IN3
> V
DD3
+ 300mV
T
J
= [-40°C ; 125°C] ; I
O
= 0 mA
-1.5 1.5
Δ
VDD_IL
Static Load Regulation
V
IN3
> V
DD3
+ 300mV
I
O
ranging from 0 to I
OMAX
0.05 0.5 %.V
DD3
Dynamic Load Regulation
V
IN3
> V
DD3
+ 300mV
I
O:
0 to I
OMAX
; 1μs rise time
-40
mV
V
IN3
> V
DD3
+ 300mV
I
O:
I
OMAX
to 0 ; 1μs fall time
40
Δ
VDD_VIN
Static Line Regulation
V
IN3
> V
DD3
+ 300mV. I
O
= 0 mA
V
IN3
from 2.9 to 5.5V
5mV
V
DROPOUT
Drop Out Voltage
(4)
I
O
= 10mA 50 mV
I
O
= 200mA 250 mV
PSRR Power Supply Rejection Ratio
V
IN3
> V
DD3
+ 300mV
I
O
= 1mA. DC to 3kHz.
60
dB
V
IN3
> V
DD3
+ 300mV
I
O
= 10mA. DC to 3kHz.
50
I
INRUSH
Inrush Current
Current from V
IN3
from 0 to 95%
of final value.
200 500 mA
T
START
Start-up Time
V
DD3
OFF and rising to 95% of
final value. I
O
= 0 mA
1ms
PWRF
DET
Power Fail Detector Threshold
Accuracy
Overload of the programmed
threshold by 10mV / 5us min
(3)
.
-1 - +1 %.V
DD3