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| 型号： | TC1303B-EF1EUN |
| 厂商： | Microchip Technology Inc. |
| 英文描述： | 500 mA Synchronous Buck Regulator, + 300 mA LDO with Power-Good Output |
| 中文描述： | 500毫安同步降压稳压器，300 mA的LDO具有电源就绪输出 |
| 文件页数： | 7/30页 |
| 文件大小： | 441K |
| 代理商： | TC1303B-EF1EUN |
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2005 Microchip Technology Inc.
DS21949A-page 15
TC1303B
3.0
PIN DESCRIPTIONS
The descriptions of the pins are listed in Table 3-1.
TABLE 3-1:
PIN FUNCTION TABLE
3.1
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
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 regulator. An
additional capacitor can be added to lower the LDO
regulator input ripple voltage.
3.3
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.
3.4
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.
3.5
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.
3.6
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).
3.7
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.
3.8
Buck Regulator Input Voltage Pin
(VIN1)
VIN1 is the buck regulator power input supply pin.
Connect a variable input voltage source to VIN1.
Connect VIN1 and VIN2 together with board traces as
short as possible.
3.9
Buck Inductor Output Pin (LX)
Connect LX directly to the buck inductor. This pin
carries large signal-level current; all connections
should be made as short as possible.
3.10
Power Ground Pin (PGND)
Connect all large-signal level ground returns to PGND.
These large-signal, level ground traces should have a
small loop area and length to prevent coupling of
switching noise to sensitive traces. Please see the
physical layout information supplied in Section 5.0
“Application
Circuits/Issues”
for
grounding
recommendations.
3.11
Exposed Pad (EP)
For the DFN package, connect the EP to AGND with
vias into the AGND plane.
Pin No.
Name
Function
1
SHDN2
Active Low Shutdown Input for LDO Output Pin
2VIN2
Analog Input Supply Voltage Pin
3VOUT2
LDO Output Voltage Pin
4
PG
Power-good Output Pin
5AGND
Analog Ground Pin
6VFB / VOUT1 Buck Feedback Voltage (Adjustable Version) / Buck Output Voltage (Fixed Version) Pin
7
SHDN1
Active Low Shutdown Input for Buck Regulator Output Pin
8VIN1
Buck Regulator Input Voltage Pin
9LX
Buck Inductor Output Pin
10
PGND
Power Ground Pin
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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相关代理商/技术参数 |
参数描述 |
|---|---|
| TC1303B-IA0EMF | 功能描述:低压差稳压器 - LDO PWM/LDO combo w/PG RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| TC1303B-IA0EMFTR | 功能描述:低压差稳压器 - LDO PWM/LDO combo w/PG RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| TC1303B-IA0EUN | 功能描述:低压差稳压器 - LDO PWM/LDO combo w/PG RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| TC1303B-IA0EUNTR | 功能描述:低压差稳压器 - LDO PWM/LDO combo w/PG RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| TC1303B-PA0EMF | 功能描述:低压差稳压器 - LDO PWM/LDO combo w/PG RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
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