CAT6218 Datasheet, PDF (2/9 Pages) Catalyst Semiconductor – 300mA CMOS LDO Regulator

CAT6218
V_IN
2.3 V
to 5.5 V
C_IN
1 μF
VIN VOUT
CAT6218
OFF _ON
EN BYP
GND
V_OUT
C_OUT
1 μF
C_BYP (Optional)
10 nF
VIN
V_IN
EN
BYP
Reference
LDO
VOUT
V_OUT
Shutdown
Switch
GND
Figure 1. Typical Application Circuit
Figure 2. CAT6218 Functional Block Diagram
Pin Function
VIN is the supply pin for the LDO. A small 1 mF ceramic
bypass capacitor is required between the V_IN pin and ground
near the device. When using longer connections to the power
supply, C_IN value can be increased without limit. The
operating input voltage range is from 2.3 V to 5.5 V.
EN is the enable control logic (active high) for the regulator
output. It has a 2.5 MW pull−down resistor, which assures
that if EN pin is left open, the circuit is disabled.
VOUT is the LDO regulator output. A small 1 mF ceramic
bypass capacitor is required between the V_OUT pin and
ground for stability. For better transient response, its value
can be increased to 4.7 mF.
The capacitor should be located near the device. ESR
domain is 5 mW to 500 mW. V_OUT can deliver a maximum
guaranteed current of 300 mA. For input−to−output voltages
higher than 1 V, a continuous 300 mA output current might
turn−on the thermal protection. A 250 W internal shutdown
switch discharges the output capacitor in the no−load
condition.
GND is the ground reference for the LDO. The pin must be
connected to the ground plane on the PCB.
BYP is the reference bypass pin. An optional 0.01 mF
capacitor can be connected between BYP pin and GND to
reduce the output noise and enhance the PSRR at high
frequency.
Table 1. ABSOLUTE MAXIMUM RATINGS
Parameter
Rating
Unit
V_IN
V_EN, V_OUT
Junction Temperature, T_J
Power Dissipation, P_D
Storage Temperature Range, T_S
Lead Temperature (soldering, 5 sec.)
0 to 6.5
V
−0.3 to V_IN + 0.3
V
+150
_C
Internally Limited (Note 1)
mW
−65 to +150
_C
260
_C
ESD Rating (Human Body Model)
3
kV
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the
Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect
device reliability.
Table 2. RECOMMENDED OPERATING CONDITIONS (Note 2)
Parameter
Range
Unit
V_IN
2.3 to 5.5
V
V_EN
0 to V_IN
V
Junction Temperature Range, T_J
−40 to +125
_C
Package Thermal Resistance (SOT23−5), θ_JA
235
_C/W
NOTE: Typical application circuit with external components is shown above.
1. The maximum allowable power dissipation at any T_A (ambient temperature) is P_Dmax = (T_Jmax − T_A)/q_JA. Exceeding the maximum allowable
power dissipation will result in excessive die temperature, and the regulator will go into thermal shutdown.
2. The device is not guaranteed to work outside its operating rating.
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