CAT6221_12 Datasheet, PDF (2/10 Pages) ON Semiconductor – 300 mA CMOS Dual LDO Regulator

CAT6221
VIN
V_{IN EN1}
VIN
2.3 V to 5.5 V
C_IN
1 mF
VIN VOUT1
CAT6221
OFF _ON
OFF _ON
EN1 _VOUT2
EN2 _GND
C_OUT1
1 mF
VOUT1
EN2
Reference
VOUT2
C_OUT2
1 mF
LDO1
EN1
Shutdown
Switch
VOUT1
V_OUT1
LDO2
EN2
Shutdown
Switch
GND
VOUT2
V_OUT2
Figure 1. Typical Application Circuit
Figure 2. CAT6221 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.
EN1 & 2 are the enable control logic (active high) for the
regulator outputs.
VOUT1 & 2 are the LDO regulator outputs. A small 1 mF
ceramic bypass capacitor is required between the VOUT
pins and ground. For better transient response, its value can
be increased to 4.7 mF.
The capacitor should be located near the device. For the
TSOT23 6−lead package, a continuous 300 mA output
current for both LDOs may turn−on the thermal protection.
On each output, 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.
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 (TSOT23), 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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