Datasheet

698
11011B–ATARM–21-Feb-12
SAM3N
Notes: 1. A 10µF or higher ceramic capacitor must be connected between VDDIN and the closest GND pin of the device.
This large decoupling capacitor is mandatory to reduce startup current, improving transient response and noise rejection.
2. To ensure stability, an external 1µF output capacitor, CD
OUT
must be connected between the VDDOUT and the closest GND
pin of the device. The ESR (Equivalent Series Resistance) of the capacitor must be in the range 0.1 to 10 ohms.
Solid tantalum, and multilayer ceramic capacitors are all suitable as output capacitor.
A 100nF bypass capacitor between VDDOUT and the closest GND pin of the device helps decreasing output noise and
improves the load transient response.
3. At power-up VDDIO needs to reach 0.6V before VDDIN reaches 1.0V
4. VDDIO voltage needs to be equal or below to (VDDIN voltage +0.5V)
Table 35-3. 1.8V Voltage Regulator Characteristics
Symbol Parameter Conditions Min Typ Max Units
V
VDDIN
DC Input Voltage Range
(3) (4)
1.8 3.3 3.6 V
V
VDDOUT
DC Output Voltage
Normal Mode
Standby Mode
1.8
0
V
V
ACCURACY
Output Voltage Accuracy I
Load
= 0.5 mA to 60 mA -3 3 %
I
LOAD
Maximum DC Output
Current
V
VDDIN
> 2V
V
VDDIN
≤ 2V
60
40
mA
D
DROPOUT
Dropout Voltage V
VDDIN
= 1.8V, I
Load
= 40 mA 150 mV
V
LINE
V
LINE-TR
Line Regulation
Transient Line regulation
V
VDDIN
from 2.7V to 3.6V; I
Load
MAX
V
VDDIN
from 2.7V to 3.6V; tr = tf = 5µs; I
Load
Max
CD
OUT
= 1µF
20
50
50
100
mV
V
LOAD
V
LOAD-TR
Load Regulation
Transient Load Regulation
V
VDDIN
≥ 2.2V;
I
Load
= 10% to 90% MAX
V
VDDIN
≥ 2.2V;
I
Load
= 10% to 90% MAX
tr = tf = 5 µs
CD
OUT
= 1 µF
20
50
50
100
mV
I
Q
Quiescent Current
Normal Mode;
@ I
Load
= 0 mA
@ I
Load
= 60 mA
Standby Mode;
7
700
10
1200
1
µA
CD
IN
Input Decoupling Capacitor Cf. External Capacitor Requirements
(1)
10 µF
CD
OUT
Output Decoupling
Capacitor
Cf. External Capacitor Requirements
(2)
ESR
0.75
0.1
1
10
µF
Ohm
T
ON
Tu r n o n T i m e
CD
OUT
= 1µF, V
VDDOUT
reaches V
TH+
(core
power brownout detector supply rising
threshold)
100 200 µs
T
OFF
Turn off Time CD
OUT
= 1µF 40 ms