PRELIMINARY
CM3121
ELECTRICAL OPERATING CHARACTERISTICS (CONT’D)
(SEE NOTE 3)
V
DDQ
Regulator Parameters
V
CC MIN
V
DDQ
V
DDQ ADJ
V
DDQ LD
V
DDQ LINE
e
N DDQ
I
DDQ LIM
I
DDQ SC
V
TT
V
TT LD
V
TT LINE
e
N TT
I
TT LIM
I
TT SC
Input Voltage
Default Output Voltage Range
Adjustable Output Voltage
Range
Load Regulation
Line Regulation
Output Noise Voltage
Current Limit
Short Circuit Current
V
DDQ
= 2.5V, I
DDQ
= 1.5A,
SENSE_V
DDQ
= 0V, Note 4
I
DDQ
= 0.01A,V
CC
= 3.3V,
SENSE_V
DDQ
= 0V, Note 4
V
CC
= 3.3V, SENSE_V
DDQ
tied to
external resistors R1 and R2, Note 4
T
A
= 25°C, V
CC
= 2.5V,
0.01A
≤
I
DDQ
≤
1.0A, Note 4
-1.0
-
49
1.7
2.0
0.5
1.0
%
2.2V
≤
V
CC
≤
2.8V, Note 4
BW = 10Hz - 100kHz, C
DDQ
= 10µF
Note 4
V
DDQ
< 0.3V
V
DDQ
= 1.8V, I
TT
= 0.01A,
T
A
= 25°C, V
DDQ
= 1.8V,
0.01A
≤
I
TT
≤
±0.3A
2.2V
≤
V
CC
≤
2.8V
T
A
= 25°C, I
TT
= 0A,
BW = 10Hz - 100kHz, C
TT
= 10µF
0.4
V
TT
< 0.3V
0.86
-1.0
-1.0
µVrms
A
A
2.2
1.75
1.6
-
-
1.80
1.85
2.8
2.5
V
V
V
%
T
A
= 25°C, I
DDQ
= 0.01A,
V
TT
Regulator Parameters
Output Voltage Range
Load Regulation
Line Regulation
Output Noise Voltage
Current Limit
Short Circuit Current
0.90
-
-
51
0.6
0.3
0.94
1.0
1.0
V
%
%
µVrms
A
A
Note 3: All parameters specified at T
A
= -40°C to +85°C unless otherwise noted.
Note 4: Note that the I
DDQ
current specified is the load current output from the V
DDQ
pin. V
DDQ
also supplies current internally to the
V
TT
regulator when it is sourcing current. The maximum source current can be up to 0.5A. So the maximum total current
from the V
DDQ
regulator is the external V
DDQ
current I
DDQ
added to the maximum V
TT
sourcing current I
TT
. All load currents
are specified as such, but the V
DDQ
current limit is specified at a current just above the total maximum current.
V
CC
(1)
2.8V to 3.6V
X
EN_DDR
Low
High
V
DDQ OUT
V
DDQ
0V
V
TT OUT
V
DDQ
/ 2
0V
Table 1: Truth Table for CM3121
©
2004 California Micro Devices Corp. All rights reserved.
6
430 N. McCarthy Blvd., Milpitas, CA 95035-5112
●
Tel: 408.263.3214
●
Fax: 408.263.7846
●
www.calmicro.com
11/12/04
CALMIRCO [ CALIFORNIA MICRO DEVICES CORP ]
