CM2830/CM2830A
300mA CMOS LDO
2004/04/30 Rev. 1.6
Champion Microelectronic Corporation
Page 9
ELECTRICAL CHARACTERISTICS
TA = +25
℃; unless otherwise noted
CM2830/CM2830A
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
Input Voltage
Note 1
7
V
Output Voltage Accuracy
Io = 1mA
-1.5
1.5
%
1.2V<VO(NOM)<=2.0V
1300
2.0V<VO(NOM)<=2.5V
800
Dropout Voltage
IO = 300mA,
VOUT=VO(NOM)-1.5%,
2.5V<VO(NOM)
300
mV
Output Current
VOUT > 1.2V
300
mA
Short Circuit Current
VOUT < 1.05V
150
300
mA
Current Limit
VOUT>1.2V
300
450
mA
Quiescent Current
VIN=5V, No Load
30
35
µ A
Ground Pin Current
I = 1mA to 300mA
30
35
µ A
IOUT=5mA, VIN=VOUT+1 to VOUT+2, VOUT <= 3.0V
-0.15
0.03
0.15
Line Regulation
IOUT=5mA, VIN=VOUT+1 to VOUT+2, VOUT > 3.0V
-0.3
0.06
0.3
%
Load Regulation
Io=1mA to 300mA
-1
0.2
1
%
f=1KHz
60
dB
f=10KHz
50
Power Supply Rejection
IO = 100mA
CO=2.2
F ceramic
µ
f=100KHz
40
Over Temperature Shutdown
150
℃
Over Temperature Hysteresis
30
℃
Output Noise
F=10Hz to 100kHz, CO=2.2
µ F, I
O = 10mA
30
µ Vrms
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 2.2
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.