PJ3100 查看數據表（PDF） - Promax Johnton
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PJ3100 Datasheet PDF : 9 Pages
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PJ3100Series
300mA CMOS LDO With Enable
ORDERING INFORMATION
Part Number
PJ3115CX
PJ3118CX
PJ3119CX
PJ3122CX
PJ3125CX
PJ3127CX
PJ3128CX
PJ3129CX
PJ3130CX
PJ3133CX
PJ3135CX
PJ3136CX
PJ3138CX
Output Voltage
1.5V
1.8V
1.9V
2.2V
2.5V
2.7V
2.8V
2.9V
3.0V
3.3V
3.5V
3.6V
3.8V
Voltage Code
A
D
E
H
K
M
N
O
P
S
U
V
X
Package
SOT-23-5L
SOT-23-5L
SOT-23-5L
SOT-23-5L
SOT-23-5L
SOT-23-5L
SOT-23-5L
SOT-23-5L
SOT-23-5L
SOT-23-5L
SOT-23-5L
SOT-23-5L
SOT-23-5L
DETAILED DESCRIPTION
The PJ3100 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 PJ3100 switches from voltage mode to current mode when the load exceeds the rated output current. This prevents over-stress.
The PJ3100 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 0.95V.
ENABLE
The Enable pin normally floats high. When actively, pulled low, the PMOS pass transistor shut off, and all internal circuits are
powered down. In this state, the quiescent current is less than 2µA. This pin behaves much like an electronic switch.
EXTERNAL CAPACITOR
The PJ3100 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 0.1uF to have a beneficial effect. All capacitors should be placed in close proximity to the pins. A “quiet” ground
termination is desirable.
4-9
2002/11.rev.A
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