4 dcdc0 and dcdc1 – Rainbow Electronics AT73C246 User Manual
Page 14
14
11050A–PMAAC–07-Apr-10
AT73C246
9.4
DCDC0 and DCDC1
Unless otherwise specified: External components L=2.2
μH, C
OUT
=22
μF and C
IN
=10
μF. V
IN{0,1}
> V
DD{0,1}
+ 500mV.
T
J
= [-40°C ; +125°C].
Table 9-5.
DCDC0 and DCDC1 Electrical Characteristics
Symbol
Parameter
Comments
Min
Typ
Max
Units
V
IN
Operating Supply Voltage
V
IN0
, V
IN1
and V
INSYS
2.9
3.6
5.5
V
I
DD
Supply Current
OFF
-
-
1
µA
PFM operation.
V
DD0
= 1.85V, V
DD1
= 1.2V
-
40
80
µA
PWM operation.
V
DD0
= 1.85V, V
DD1
= 1.2V
-
3
6.5
mA
I
O
Output Current
PFM operation.
-
-
50
mA
PWM operation.
-
-
600
mA
f
SW
Switching Frequency
PWM operation.
1.8
2
2.2
MHz
V
DD0
Default Output Voltage
V
DD0
-
1.85
-
V
V
DD1
V
DD1
-
1.2
-
V
V
DD_RANGE
Programmable Output Voltage
Range
PFM or PWM operation.
0.8
3.6
V
V
DD_STEP
Output Voltage Steps
PFM or PWM operation.
50
mV
N
STEP
Number of Output Steps
In case of direct output voltage
programming. Automatic ramping
not active.
4
step /
100µs
T
STEP
Step time
With automatic ramping.
260
280
300
µs
V
DD_ACC
DC Output Voltage Accuracy
PFM; T
J
= 25°C ; I
O
= 0 mA
-1.5
2.5
%
PFM; T
J
= [-40;125°C] ; I
O
= 0 mA
-2
3
PWM; T
J
= 25°C ; I
O
= 0 mA
-1.5
1.5
PWM; T
J
= [-40;125°C] ; I
O
= 0 mA
-2
2
V
DD_RIPPLE
Ripple Voltage
PWM operation.
2
mV
Δ
VDD_IL
Static Load Regulation
PWM operation. I
O
ranging from 0
to I
OMAX
2
5
mV
Dynamic Load Regulation
PWM. I
O
: 0 to I
OMAX
; 1
μs rise time
-40
mV
PWM. I
O
: I
OMAX
to 0 ; 1
μs fall time
40
Δ
VDD_VIN
Static Line Regulation
V
IN0
and V
INSYS
from 2.9 to 5.5V
V
DD0
= 1.85V, V
DD1
= 1.2V
5
mV
Eff
Efficiency
PWM. I
OMAX
load. V
DD0
= 1.85V.
Relative to V
IN0
input supply.
85
%
PWM. I
OMAX
load. V
DD1
= 1.2V.
Relative to V
IN1
input supply.
78
%
I
INRUSH
Inrush Current
Current from V
IN(0,1)
and V
INSYS
from 0 to 100% V
DD{0,1}
V
DD0
= 1.85V, V
DD1
= 1.2V
30
200
mA