CAT6243 Datasheet, PDF (2/15 Pages) ON Semiconductor – 1 Amp Adjustable CMOS LDO Voltage Regulator

CAT6243
VIN
VIN VOUT
ENABLE
C_IN
1 mF
CAT6243
BYP
ADJ
C_BYP
(Optional)
GND
VOUT
C_OUT
2.2 mF
Figure 1. Application Schematic
VIN
I_SENSE
Thermal
Shutdown
+
−
+
EN
Enable
Logic
V_REF ^−
2.5 M
VOUT
ADJ
BYP
GND
Figure 2. Simplified Block Diagram
Table 1. PIN FUNCTION DESCRIPTION
Pin #
Pin #
Pin #
WDFN−6 DPAK−5−4 DPAK−5−5 Pin Name
1
5
5
EN
2, PAD
3, TAB
3, TAB
GND
3
NC
NC
BYP
4
2
5
1
2
V_OUT
1
ADJ
6
4
4
V_IN
Description
The Enable Input. An active HIGH input, turning ON the LDO. This input
should be tied to V_IN if the 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 con-
nected to Ground and as such can cause short circuits to signal traces run-
ning 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 100 pF to 470 pF between BYP and
ground reduces noise on V_OUT. This capacitor is optional and it increases
the turn−on time.
Regulated Output Voltage. A protection block eliminates any current flow
from output to input if V_OUT > V_IN.
Output Voltage Adjust Input. This input ties to the common point of a resistor
divider which determines the regulator’s output voltage. See Applications
section for details on selecting resistor values.
Positive Power Supply Input. Supplies power for V_OUT as well as the regu-
lator’s internal circuitry.
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