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参数资料
| 型号： | TC1303B-FN2EUNTR |
| 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： | 5/30页 |
| 文件大小： | 441K |
| 代理商： | TC1303B-FN2EUNTR |
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2005 Microchip Technology Inc.
DS21949A-page 5
TC1303B
Synchronous Buck Regulator (V
OUT1
)
Adjustable Output Voltage Range
Adjustable Reference Feedback
Voltage (V
FB1
)
Feedback Input Bias Current
(I
FB1
)
Output Voltage Tolerance Fixed
(V
OUT1
)
Line Regulation (V
OUT1
)
V
OUT1
V
FB1
0.8
0.78
—
0.8
4.5
0.82
V
V
I
VFB1
—
-1.5
—
nA
V
OUT1
-2.5
±0.3
+2.5
%
Note 2
V
LINE-REG
—
0.2
—
%/V
V
IN
=V
R
+1V to 5.5V,
I
LOAD
= 100 mA
V
IN
= V
R
+ 1.5V, I
LOAD
= 100 mA to
500 mA (
Note 1
)
I
OUT1
= 500 mA, V
OUT1
= 3.3V
(
Note 5
)
Load Regulation (V
OUT1
)
V
LOAD-REG
—
0.2
—
%
Dropout Voltage V
OUT1
V
IN
– V
OUT1
—
280
—
mV
Internal Oscillator Frequency
Start Up Time
R
DSon
P-CHANNEL
R
DSon
N-CHANNEL
L
X
Pin Leakage Current
F
OSC
T
SS
R
DSon-P
R
DSon-N
I
LX
1.6
—
—
—
-1.0
2.0
0.5
450
450
±0.01
2.4
—
650
650
1.0
MHz
ms
m
Ω
m
Ω
μ
A
T
R
= 10% to 90%
I
P
=100 mA
I
N
=100 mA
SHDN = 0V, V
IN
= 5.5V, L
X
= 0V,
L
X
= 5.5V
Positive Current Limit Threshold
LDO Output (V
OUT2
)
Output Voltage Tolerance (V
OUT2
)
Temperature Coefficient
Line Regulation
+I
LX(MAX)
—
700
—
mA
V
OUT2
TCV
OUT
Δ
V
OUT2
/
Δ
V
IN
Δ
V
OUT2
/
I
OUT2
Δ
V
OUT2
/
I
OUT2
V
IN
– V
OUT2
-2.5
—
-0.2
±0.3
25
±0.02
+2.5
—
+0.2
%
Note 2
Note 3
(V
R
+1V)
≤
V
IN
≤
5.5V
ppm/°C
%/V
Load Regulation, V
OUT2
≥
2.5V
-0.75
0.1
+0.75
%
I
OUT2
= 0.1 mA to 300 mA
(
Note 4
)
Load Regulation, V
OUT2
< 2.5V
-0.90
0.1
+0.90
%
I
OUT2
= 0.1 mA to 300 mA
(
Note 4
)
Dropout Voltage V
OUT2
> 2.5V
—
137
205
62
300
500
—
mV
I
OUT2
= 200 mA (
Note 5
)
I
OUT2
= 300 mA
f
≤
100 Hz, I
OUT1
= I
OUT2
= 50 mA,
C
IN
= 0 μF
f
≤
1 kHz, I
OUT2
= 50 mA,
SHDN1 = GND
R
LOAD2
≤
1
Ω
Power Supply Rejection Ratio
PSRR
—
dB
Output Noise
eN
—
1.8
—
μV/(Hz)
Output Short Circuit Current
(Average)
Note
1:
The Minimum V
IN
has to meet two conditions: V
IN
≥
2.7V and V
IN
≥
V
RX
+ V
DROPOUT,
V
RX
= V
R1
or V
R2
.
2:
V
RX
is the regulator output voltage setting.
3:
TCV
OUT2
= ((V
OUT2max
– V
OUT2min
) * 10
6
)/(V
OUT2
* D
T
).
4:
Regulation is measured at a constant junction temperature using low duty cycle pulse testing. Load regulation is tested
over a load range from 0.1 mA to the maximum specified output current.
5:
Dropout voltage is defined as the input to output voltage differential at which the output voltage drops 2% below its
nominal value measured at a 1V differential.
6:
The maximum allowable power dissipation is a function of ambient temperature, the maximum allowable junction
temperature and the thermal resistance from junction to air. (i.e. T
A
, T
J
,
θ
JA
). Exceeding the maximum allowable power
dissipation causes the device to initiate thermal shutdown.
7:
The integrated MOSFET switches have an integral diode from the L
X
pin to V
IN
, and from L
X
to P
GND
. In cases where
these diodes are forward-biased, the package power dissipation limits must be adhered to. Thermal protection is not
able to limit the junction temperature for these cases.
8:
V
IN1
and V
IN2
are supplied by the same input source.
I
OUTsc2
—
240
—
mA
DC CHARACTERISTICS (CONTINUED)
Electrical Characteristics:
V
IN1
=V
IN2
= SHDN1,2 = 3.6V, C
OUT1
= C
IN
= 4.7 μF, C
OUT2
= 1μF, L
= 4.7 μH, V
OUT1
(ADJ) = 1.8V,
I
OUT1
= 100 ma, I
OUT2
= 0.1 mA T
A
= +25°C.
Boldface
specifications apply over the T
A
range of
-40°C to +85°C
.
Parameters
Sym
Min
Typ
Max
Units
Conditions
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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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