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TC1303A Datasheet(PDF) 18 Page - Microchip Technology

Part No. TC1303A
Description  500 mA Synchronous Buck Regulator, 300 mA LDO with Power-Good Output
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Maker  MICROCHIP [Microchip Technology]
Homepage  http://www.microchip.com
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TC1303A Datasheet(HTML) 18 Page - Microchip Technology

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TC1303A/TC1303B/TC1303C/TC1304
DS21949B-page 18
© 2005 Microchip Technology Inc.
3.0
PIN DESCRIPTIONS
The descriptions of the pins are listed in Table 3-1.
TABLE 3-1:
PIN FUNCTION TABLE
3.1
TC1303 LDO Shutdown Input Pin
(SHDN2)
SHDN2 is a logic-level input used to turn the LDO Reg-
ulator on and off. A logic-high (> 45% of VIN), will
enable the regulator output. A logic-low (< 15% of VIN)
will ensure that the output is turned off.
3.2
TC1304 Shutdown Input Pin
(SHDN)
SHDN is a logic-level input used to initiate the sequenc-
ing of the LDO output, then the buck regulator output.
A logic-high (> 45% of VIN), will enable the regulator
outputs. A logic-low (< 15% of VIN) will ensure that the
outputs are turned off.
3.3
LDO Input Voltage Pin (VIN2)
VIN2 is a LDO power input supply pin. Connect variable
input voltage source to VIN2. Connect VIN1 and VIN2
together with board traces as short as possible. VIN2
provides the input voltage for the LDO. An additional
capacitor can be added to lower the LDO regulator
input ripple voltage.
3.4
LDO Output Voltage Pin (VOUT2)
VOUT2 is a regulated LDO output voltage pin. Connect
a 1 µF or larger capacitor to VOUT2 and AGND for proper
operation.
3.5
Power-Good Output Pin (PG)
PG is an output level indicating that VOUT2 (LDO) is
within 94% of regulation. The PG output is configured
as a push-pull for the TC1303B and open-drain output
for the TC1303A, TC1303C and TC1304.
3.6
Analog Ground Pin (AGND)
AGND is the analog ground connection. Tie AGND to the
analog portion of the ground plane (AGND). See the
physical layout information in Section 5.0 “Application
Circuits/Issues” for grounding recommendations.
3.7
Buck Regulator Output Sense Pin
(VFB/VOUT1)
For VOUT1 adjustable-output voltage options, connect
the center of the output voltage divider to the VFB pin.
For fixed-output voltage options, connect the output of
the buck regulator to this pin (VOUT1).
3.8
Buck Regulator Shutdown Input
Pin (SHDN1)
SHDN1 is a logic-level input used to turn the buck
regulator on and off. A logic-high (> 45% of VIN), will
enable the regulator output. A logic-low (< 15% of VIN)
will ensure that the output is turned off.
Pin No.
TC1303
Name
TC1304
Name
Function
1
SHDN2
Active Low Shutdown Input for LDO Output Pin
1
SHDN
Active Low Shutdown Input both Buck Regulator Output and LDO Output.
Initiates sequencing up and down
2VIN2
VIN2
Analog Input Supply Voltage Pin
3VOUT2
VOUT2
LDO Output Voltage Pin
4
PG
PG
Power-Good Output Pin
5AGND
AGND
Analog Ground Pin
6VFB/VOUT1
VFB/VOUT1 Buck Feedback Voltage (Adjustable Version) / Buck Output Voltage
(Fixed Version) Pin
7
SHDN1
Active Low Shutdown Input for Buck Regulator Output Pin
7—
AGND
Analog Ground Pin
8VIN1
VIN1
Buck Regulator Input Voltage Pin
9LX
LX
Buck Inductor Output Pin
10
PGND
PGND
Power Ground Pin
EP
Exposed
Pad
Exposed
Pad
For the DFN package, the center exposed pad is a thermal path to remove
heat from the device. Electrically this pad is at ground potential and should
be connected to AGND


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