CAT6217
150 mA CMOS LDO
Regulator
Description
The CAT6217 is a 150 mA CMOS low dropout regulator that
provides fast response time during load current and line voltage
CAT6217
VIN
VOUT
V
IN
LDO
EN
V VIN VOUT V
IN OUT
V
OUT
C
IN
2.3 V
C
OUT
to 5.5 V
1 F
1 F
CAT6217
Shutdown
Reference
BYP
OFF
EN BYP Switch
ON
C (Optional)
BYP
GND
10 nF
GND
Figure 1. Typical Application Circuit Figure 2. CAT6217 Functional Block Diagram
Pin Function
VIN is the supply pin for the LDO. A small 1 F ceramic The capacitor should be located near the device. ESR
bypass capacitor is required between the V pin and ground domain is 5 m to 500 m. V can deliver a maximum
IN OUT
near the device. When using longer connections to the power guaranteed current of 150 mA. A 250 internal shutdown
supply, C value can be increased without limit. The switch discharges the output capacitor in the noload
IN
operating input voltage range is from 2.3 V to 5.5 V. condition.
EN is the enable control logic (active high) for the regulator GND is the ground reference for the LDO. The pin must be
output. It has a 2.5 M pulldown resistor, which assures connected to the ground plane on the PCB.
that if EN pin is left open, the circuit is disabled.
BYP is the reference bypass pin. An optional 0.01F
VOUT is the LDO regulator output. A small 1 F ceramic capacitor can be connected between BYP pin and GND to
bypass capacitor is required between the V pin and reduce the output noise and enhance the PSRR at high
OUT
ground for stability. For better transient response, its value frequency.
can be increased to 4.7 F.
Table 1. ABSOLUTE MAXIMUM RATINGS
Parameter Rating Unit
V 0 to 6.5 V
IN
V , V 0.3 to V + 0.3 V
EN OUT IN
Junction Temperature, T +150 C
J
Power Dissipation, P Internally Limited (Note 1) mW
D
Storage Temperature Range, T 65 to +150 C
S
Lead Temperature (soldering, 5 sec.) 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 2.3 to 5.5 V
IN
V 0 to V V
EN IN
Junction Temperature Range, T 40 to +125 C
J
Package Thermal Resistance (SOT23 5), 235
C/W
JA
NOTE: Typical application circuit with external components is shown above.
1. The maximum allowable power dissipation at any T (ambient temperature) is P = (T T )/ . Exceeding the maximum allowable
A Dmax Jmax A JA
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.