參數(shù)資料
型號： TC1303A-RI1EUN
元件分類： 穩(wěn)壓器
英文描述： 0.5 A SWITCHING REGULATOR, 2400 kHz SWITCHING FREQ-MAX, PDSO10
封裝： PLASTIC, MO-187, MSOP-10
文件頁數(shù)： 11/38頁
文件大?。?/td> 756K
代理商： TC1303A-RI1EUN
2008 Microchip Technology Inc.
DS21949C-page 19
TC1303A/TC1303B/TC1303C/TC1304
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
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.
3.2
TC1304 Shutdown Input Pin
(SHDN)
SHDN is a logic-level input used to initiate the
sequencing 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 F 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).
Pin No.
Symbol
Description
TC1303
TC1304
MSOP, DFN MSOP, DFN
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
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
Power Ground Pin
11
EP
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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