CAT6219_08 Datasheet, PDF (2/10 Pages) Catalyst Semiconductor – 500mA CMOS LDO Regulator

CAT6219
PIN DESCRIPTIONS
Pin # Name Function
1 VIN Supply voltage input.
2 GND Ground reference.
3
EN
Enable input (active high); a 2.5MΩ
pull-down resistor is provided.
4
BYP
Optional bypass capacitor connection for
noise reduction and PSRR enhancing.
4
ADJ
Adjustable input. Feedback pin
connected to resistor divider.
5 VOUT LDO Output Voltage.
V_IN
2.3V
to 5.5V
VIN
C_IN
VOUT
1µF
CAT6219
OFF ON
EN
ADJ
GND
( ) V_OUT = 1.24V
1
+
R₁
R₂
C_OUT
2.2µF
V_OUT
R₁
R₂
Figure 1. Adjustable Output LDO
PIN FUNCTION
VIN is the supply pin for the LDO. A small 1μF
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 2.3V to 5.5V.
EN is the enable control logic (active high) for the regulator
output. It has a 2.5MΩ pull-down resistor, which
assures that if EN pin is left open, the circuit is disabled.
VOUT is the LDO regulator output. A small 2.2μF
ceramic bypass capacitor is required between the
VOUT pin and ground. For better transient response,
its value can be increased to 4.7μF.
The capacitor should be located near the device. For
the SOT23-5 package, a continuous 500mA output
current may turn-on the thermal protection. A 250Ω
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 0.01μF
capacitor can be connected between BYP pin and
GND to reduce the output noise and enhance the
PSRR at high frequency.
ADJ is the adjustable input pin for the adjustable
LDO. The pin is connected to the resistor voltage
divider.
ABSOLUTE MAXIMUM RATINGS ⁽¹⁾
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.)
ESD Rating (Human Body Model)
0 to 6.5
V
-0.3 to V_IN+0.3
V
+150
°C
Internally Limited ⁽²⁾
mW
-65 to +150
°C
260
°C
3
kV
RECOMMENDED OPERATING CONDITIONS ⁽³⁾
Parameter
Range
V_IN
2.3 to 5.5
V_EN
0 to V_IN
Junction Temperature Range, T_J
-40 to +125
Package Thermal Resistance (SOT23-5), θ_JA
235
Typical application circuit with external components is shown on page 1.
Unit
V
V
°C
°C/W
Notes:
(1) Exceeding maximum rating may damage the device.
(2) The maximum allowable power dissipation at any T_A (ambient temperature) is P_Dmax = (T_Jmax – T_A) / θ_JA. Exceeding the maximum
allowable power dissipation will result in excessive die temperature, and the regulator will go into thermal shutdown.
(3) The device is not guaranteed to work outside its operating rating.
Doc. No. MD-10009 Rev. D
2
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice