TC1302A_13 Datasheet, PDF (10/26 Pages) Microchip Technology – Low Quiescent Current Dual Output LDO

TC1302A/B
3.0 TC1302A PIN DESCRIPTIONS
The descriptions of the pins are listed in Table 3-1.
TABLE 3-1:
Pin No.
1
2
3
4
5
6
7
8
TC1302A PIN FUNCTION TABLE
Name
Function
NC
V_OUT1
GND
Bypass
SHDN2
V_OUT2
V_IN
NC
No connect.
Regulated output voltage #1, capable of 300 mA.
Circuit ground pin.
Internal reference bypass pin. A 10 nF external capacitor can be used to further reduce
output noise and improve PSRR performance.
Output #2 shutdown control input.
Regulated output voltage #2, capable of 150 mA.
Unregulated input voltage pin.
No connect.
3.1 Regulated Output Voltage #1
(V_OUT1)
Connect V_OUT1 to the positive side of the V_OUT1
capacitor and load. Capable of 300 mA maximum
output current. V_OUT1 output is available when V_IN is
available; there is no pin to turn it OFF. See TC1302B
if ON/OFF control of V_OUT1 is desired.
3.2 Circuit Ground Pin (GND)
Connect GND to the negative side of the input and
output capacitor. Only the LDO internal circuitry bias
current flows out of this pin (200 µA maximum).
3.3 Reference Bypass Input
By connecting an external 10 nF capacitor (typical) to
the Bypass Input, both outputs (V_OUT1 and V_OUT2) will
have less noise and improved Power Supply Ripple
Rejection (PSRR) performance. The LDO output
voltage start-up time will increase with the addition of
an external bypass capacitor. By leaving this pin
unconnected, the start-up time will be minimized.
3.4 Output Voltage #2 Shutdown
(SHDN2)
ON/OFF control is performed by connecting SHDN2 to
its proper level. When the input of this pin is connected
to a voltage less than 15% of V_IN, V_OUT2 will be OFF. If
this pin is connected to a voltage that is greater than
45% of V_IN, V_OUT2 will be turned ON.
3.5 Regulated Output Voltage #2
(V_OUT2)
Connect V_OUT2 to the positive side of the V_OUT2
capacitor and load. This pin is capable of a maximum
output current of 150 mA. V_OUT2 can be turned ON and
OFF using SHDN2.
3.6 Unregulated Input Voltage Pin
(V_IN)
Connect the unregulated input voltage source to V_IN. If
the input voltage source is located more than several
inches away or is a battery, a typical input capacitance
of 1 µF to 4.7 µF is recommended.
DS21333C-page 10
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