CM2830/CM2830A
300mA CMOS LDO
ELECTRICAL CHARACTERISTICS
T
A
= +25℃; unless otherwise noted
CM2830/CM2830A
Min.
Note 1
I
o
= 1mA
I
O
= 300mA,
V
OUT
=V
O(NOM)
-1.5%,
1.2V<V
O(NOM)
<=2.0V
2.0V<V
O(NOM)
<=2.5V
2.5V<V
O(NOM)
300
150
300
450
30
30
-0.15
-0.3
-1
0.03
0.06
0.2
60
50
40
150
30
F=10Hz to 100kHz, C
O
=2.2
µ
F, I
O
= 10mA
30
25
℃
℃
35
35
0.15
0.3
1
300
-1.5
Typ.
Max.
7
1.5
1300
800
300
mA
mA
mA
mV
Parameter
Input Voltage
Output Voltage Accuracy
Dropout Voltage
Output Current
Short Circuit Current
Current Limit
Quiescent Current
Ground Pin Current
Line Regulation
Load Regulation
Power Supply Rejection
Over Temperature Shutdown
Over Temperature Hysteresis
Output Noise
Output Voltage Temp. Coeff.
Note 1.
V
IN(MIN)
= V
OUT
+ V
DROPOUT
Test Conditions
Unit
V
%
V
OUT
> 1.2V
V
OUT
< 1.05V
V
OUT
>1.2V
V
IN
=5V, No Load
I = 1mA to 300mA
I
OUT
=5mA, V
IN
=V
OUT
+1 to V
OUT
+2, V
OUT
<= 3.0V
I
OUT
=5mA, V
IN
=V
OUT
+1 to V
OUT
+2, V
OUT
> 3.0V
I
o
=1mA to 300mA
C
O
=2.2
µ
F ceramic
I
O
= 100mA
f=1KHz
f=10KHz
f=100KHz
µ
A
µ
A
%
%
dB
µ
Vrms
ppm/℃
DETAILED DESCRIPTION
The CM2830/CM2830A family of CMOS regulators contain a PMOS pass transistor, voltage reference, error amplifier,
over-current protection, thermal shutdown, and short circuit protection.
The P-channel pass transistor receives data from the error amplifier, over-current shutdown, short output protection, and thermal
protection circuits. During normal operation, the error amplifier compares the output voltage to a precision reference. Over-current
and Thermal shutdown circuits become active when the junction temperature exceeds 150℃, or the current exceeds 300mA.
During thermal shutdown, the output voltage remains low. Normal operation is restored when the junction temperature drops
below 120℃.
The CM2830/CM2830A switches from voltage mode to current mode when the load exceeds the rated output current. This
prevents over-stress. The CM2830 also incorporates current fold-back to reduce power dissipation when the output is
short-circuited. This feature becomes active when the output drops below 1.05V, and reduces the current flow by 65%. Full
current is restored when the voltage exceeds 1.05V.
EXTERNAL CAPACITOR
The CM2830/2830A is stable with an output capacitor to ground of 2.2
µ
F or greater. It can keep stable even with higher or poor
ESR capacitors. A second capacitor is recommended between the input and ground to stabilize VIN. The input capacitor should
be larger than 0.1
µ
F to have a beneficial effect. All capacitors should be placed in close proximity to the pins. A “quiet” ground
termination is desirable.
2004/04/30
Rev. 1.6
Champion Microelectronic Corporation
Page 9
CHAMP [ CHAMPION MICROELECTRONIC CORP. ]
