CM2830/CM2830A
300mA CMOS LDO
ELECTRICAL CHARACTERISTICS
TA = +25℃; unless otherwise noted
CM2830/CM2830A
Unit
Parameter
Test Conditions
Min.
Note 1
-1.5
Typ.
Max.
7
Input Voltage
V
Output Voltage Accuracy
Io = 1mA
1.2V<VO(NOM)<=2.0V
1.5
%
1300
800
300
IO = 300mA,
Dropout Voltage
mV
2.0V<VO(NOM)<=2.5V
2.5V<VO(NOM)
V
OUT=VO(NOM)-1.5%,
Output Current
Short Circuit Current
Current Limit
VOUT > 1.2V
300
300
mA
mA
mA
µA
µA
VOUT < 1.05V
VOUT>1.2V
150
450
30
300
Quiescent Current
Ground Pin Current
VIN=5V, No Load
I = 1mA to 300mA
35
35
30
IOUT=5mA, VIN=VOUT+1 to VOUT+2, VOUT <= 3.0V
-0.15
-0.3
-1
0.03
0.06
0.2
60
0.15
0.3
1
Line Regulation
Load Regulation
%
I
OUT=5mA, VIN=VOUT+1 to VOUT+2, VOUT > 3.0V
Io=1mA to 300mA
f=1KHz
%
dB
IO = 100mA
f=10KHz
Power Supply Rejection
50
CO=2.2µF ceramic
f=100KHz
40
Over Temperature Shutdown
Over Temperature Hysteresis
Output Noise
150
30
℃
℃
F=10Hz to 100kHz, CO=2.2µF, IO = 10mA
30
µVrms
Output Voltage Temp. Coeff.
25
ppm/℃
Note 1. VIN(MIN) = VOUT + VDROPOUT
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 2.2µF 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 0.1µF 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. ]
