cat6243 ON Semiconductor, cat6243 Datasheet - Page 2

• Manufacturer Part Number: cat6243
• Description: 1 Amp Adjustable Cmos Ldo Voltage Regulator
• Manufacturer: ON Semiconductor

Table 1. PIN FUNCTION DESCRIPTION
WDFN−6
2, PAD
Pin #
1
3
4
5
6
Pin Name
V
GND
BYP
ADJ
V
EN
OUT
IN
The Enable Input. An active HIGH input, turning ON the LDO. This input should be tied to V
LDO is not intended to be shut off during normal operation. A pull−down 2.5 MW resistor maintains
the circuit in the OFF state if the pin is left open.
Power Supply Ground; Device Substrate. The center pad is internally connected to Ground and as
such can cause short circuits to signal traces running beneath the IC. This pad is intended for heat
sinking the IC to the PCB and is typically connected to the PCB ground plane.
Bypass input. Placing a capacitor of 1 nF to 10 nF between BYP and ground reduces noise on V
This capacitor is optional.
Regulated Output Voltage. A protection block eliminates any current flow from output to input if V
> V
Output Voltage Adjust Input. This input ties to the common point of a resistor divider which determ-
ines the regulator’s output voltage. See Applications section for details on selecting resistor values.
Positive Power Supply Input. Supplies power for V
VIN
EN
VIN
IN
.
2.5 M
Figure 2. Simplified Block Diagram
Shutdown
C
1 mF
Figure 1. Application Schematic
Thermal
IN
(Optional)
C
BYP
Enable
Logic
http://onsemi.com
BYP
VIN
ENABLE
CAT6243
GND
2
GND
VOUT
I
SENSE
+
−
V
ADJ
REF
Description
+
−
OUT
as well as the regulator’s internal circuitry.
C
2.2 mF
OUT
VOUT
ADJ
BYP
VOUT
IN
if the
OUT.
OUT