TC1302A_13 Datasheet, PDF (11/26 Pages) Microchip Technology – Low Quiescent Current Dual Output LDO

TC1302A/B
4.0 TC1302B PIN DESCRIPTIONS
The descriptions of the pins are listed in Table 4-1.
TABLE 4-1:
Pin No.
1
2
3
4
5
6
7
8
TC1302B PIN FUNCTION TABLE
Name
Function
NC
V_OUT1
GND
Bypass
SHDN2
V_OUT2
V_IN
SHDN1
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.
Output #1 shutdown control input.
4.1 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. For the TC1302B, V_OUT1 can be turned
ON and OFF using the SHDN1 input pin.
4.5 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.
4.2 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).
4.3 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 startup time will increase with the addition of an
external bypass capacitor. By leaving this pin
unconnected, the startup time will be minimized.
4.4 Output Voltage #2 Shutdown
(SHDN2)
ON/OFF control is performed by connecting SHDN2 to
its proper level. When 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.
4.6 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 minimum input
capacitance of 1 µF and 4.7 µF is recommended.
4.7 Output Voltage #1 Shutdown
(SHDN1)
ON/OFF control is performed by connecting SNDN1 to
its proper level. When this pin is connected to a voltage
less than 15% of V_IN, V_OUT1 will be OFF. If this pin is
connected to a voltage that is greater than 45% of V_IN,
V_OUT1 will be turned ON.
 2003-2012 Microchip Technology Inc.
DS21333C-page 11