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| 型号： | TC1303B-FN2EMF |
| 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： | 15/30页 |
| 文件大小： | 441K |
| 代理商： | TC1303B-FN2EMF |
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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 V
IN
), will enable
the regulator output. A logic low (< 15% of V
IN
) will
ensure that the output is turned off.
3.2
LDO Input Voltage Pin (V
IN2
)
V
IN2
is a LDO power input supply pin. Connect variable
input voltage source to V
IN2
.
Connect V
IN1
and V
IN2
together with board traces as short as possible. V
IN2
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 (V
OUT2
)
V
OUT2
is a regulated LDO output voltage pin. Connect
a 1 μF or larger capacitor to V
OUT2
and A
GND
for proper
operation.
3.4
Power-Good Output Pin (PG)
PG is an output level indicating that V
OUT2
(LDO) is
within 94% of regulation. The PG output is configured
as a push-pull for the TC1303B.
3.5
Analog Ground Pin (A
GND
)
A
GND
is the analog ground connection. Tie A
GND
to the
analog portion of the ground plane (A
GND
). See the
physical layout information in
Section 5.0 “Application
Circuits/Issues”
for grounding recommendations.
3.6
Buck Regulator Output Sense Pin
(V
FB
/V
OUT1
)
For V
OUT1
adjustable output voltage options, connect
the center of the output voltage divider to the V
FB
pin.
For fixed-output voltage options, connect the output of
the buck regulator to this pin (V
OUT1
).
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 V
IN
), will
enable the regulator output. A logic-low (< 15% of V
IN
)
will ensure that the output is turned off.
3.8
Buck Regulator Input Voltage Pin
(V
IN1
)
V
IN1
is the buck regulator power input supply pin.
Connect a variable input voltage source to V
IN1
.
Connect V
IN1
and V
IN2
together with board traces as
short as possible.
3.9
Buck Inductor Output Pin (L
X
)
Connect L
X
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 (P
GND
)
Connect all large-signal level ground returns to P
GND
.
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”
recommendations.
3.11
Exposed Pad (EP)
For the DFN package, connect the EP to A
GND
with
vias into the A
GND
plane.
for
grounding
Pin No.
Name
Function
1
SHDN2
Active Low Shutdown Input for LDO Output Pin
2
V
IN2
V
OUT2
PG
Analog Input Supply Voltage Pin
3
LDO Output Voltage Pin
4
Power-good Output Pin
5
A
GND
Analog Ground Pin
6
V
FB
/ V
OUT1
Buck Feedback Voltage (Adjustable Version) / Buck Output Voltage (Fixed Version) Pin
SHDN1
Active Low Shutdown Input for Buck Regulator Output Pin
7
8
V
IN1
L
X
P
GND
Exposed
Pad
Buck Regulator Input Voltage Pin
9
Buck Inductor Output Pin
10
Power Ground Pin
EP
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 A
GND
.
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相关代理商/技术参数 |
参数描述 |
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| 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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