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データシート TS2940 PDF ( 特性, スペック, ピン接続図 )

部品番号 TS2940
部品説明 1A Ultra Low Dropout Fixed Positive Voltage Regulator
メーカ Taiwan Semiconductor Company
ロゴ Taiwan Semiconductor Company ロゴ 
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TS2940 Datasheet, TS2940 PDF,ピン配置, 機能
TS2940
1A Ultra Low Dropout Fixed Positive Voltage Regulator
TO-263
Pin assignment:
1. Input
2. Ground
3. Output
Low Dropout Voltage 0.6V (typ.)
General Description
The TS2940 series of fixed-voltage monolithic micro-power voltage regulators is designed for a wide range of
applications. This device excellent choice of use in battery-power application. Furthermore, the quiescent current
increases on slightly at dropout, which prolongs battery life.
This series of fixed-voltage regulators features very low ground current (100uA Typ.) and very low drop output voltage
(Typ. 60mV at light load and 600mV at 1A). This includes a tight initial tolerance of 1% typ., extremely good line regulation
of 0.05% typ., and very low output temperature coefficient.
This series is offered in 3-pin TO-263, TO-220, TO-252 & SOT-223 package.
Features
— Dropout voltage typically 0.6V @Io=1A
— Output current up to 1A
— Output voltage trimmed before assembly
— -18V Reverse peak voltage
— +30V Input over voltage protection
— +60V Transient peak voltage
— Internal current limit
— Thermal shutdown protection
Block Diagram
Ordering Information
Part No.
TS2940CZxx
Operation Temp. Package
-40 ~ +125 oC TO-220
TS2940CMxx
TS2940CPxx
-40 ~ +85 oC
TO-263
TO-252
TS2940CWxx
SOT-223
Note: Where xx denotes voltage option, available are
5.0V, 3.3V, 2.5V and 1.8V. Contact factory for
additional voltage options.
Absolute Maximum Rating (Note 1)
Input Supply Voltage (Note 2)
Vin
Operation Input Supply Voltage
Vin (operate)
Power Dissipation (Note 3)
Operating Junction Temperature Range
Storage Temperature Range
Lead Soldering Temperature (260 oC)
TO-220 TO-263 Package
TO-252 / SOT-223Package
PD
TJ
TSTG
-18 ~ +60
30V
Internally Limited
-40 ~ +125
-65 ~ +150
5
4
V
V
W
oC
oC
S
TS2940
1-6 2003/12 rev. B

1 Page



TS2940 pdf, ピン配列
Application Information
The TS2940 series is a high performance with low dropout
voltage regulator suitable for moderate to high current and
voltage regulator application. Its 600mA(typ) dropout
voltage at full load and over temperature makes it
especially valuable in battery power systems and as high
efficiency noise filters in post regulator applications. Unlike
normal NPN transistor design, where the base to emitter
voltage drop and collector to emitter saturation voltage limit
the minimum dropout voltage, dropout performance of the
PNP output of these devices is limited only by low Vce
saturation voltage.
The TS2940 series is fully protected from damage due to
fault conditions. Linear current limiting is provided. Output
current during overload conditions is constant. Thermal
shutdown the device when the die temperature exceeds the
maximum safe operating temperature. Transient protection
allows device survival even when the input voltage spikes
above and below nominal. The output structure of these
regulators allows voltages in excess of the desired output
voltage to be applied without reverse current flow.
Typical Application Circuit
Output Capacitor
The TS2940 series requires an output capacitor to maintain
stability and improve transient response. Proper capacitor
selection is important to ensure proper operation. The
output capacitor selection is dependent upon the ESR of
the output capacitor the maintain stability. When the output
capacitor is 10uF or greater, the output capacitor should
have an ESR less than 2 ohm. This will improve transient
response as well as promoted stability. Ultra low ESR
capacitors (<100mohm), such as ceramic chip capacitors
may promote instability. These very low ESR levels may
cause an oscillation and/or under damped transient
response.
A low ESR solid tantalum capacitor works extremely
well and provides good transient response and
stability over temperature. Aluminum electrolytic can
also be used, as long as the ESR of the capacitor is
<2ohm. The value of the output capacitor can be
increased without limit. Higher capacitance values
help to improved transient response and ripple
rejection and reduce output noise.
Minimum Load Current
The TS2940 series is specified between finite loads.
If the output current is too small leakage currents
dominate and the output voltage rises. A 10mA
minimum load current is necessary for proper
regulation.
Input Capacitor
An input capacitor of 1uF or greater is recommended
when the device is more that 4 inches away from the
bulk AC supply capacitance or when the supply is a
battery. Small and surface mount ceramic chip
capacitors can be used for bypassing. Larger values
will help to improve ripple rejection by bypassing the
input to the regulator, further improving the integrity of
the output voltage.
Thermal Characteristics
A heatsink may be required depending on the
maximum power dissipation and maximum ambient
temperature of the application. Under all possible
operating conditions, the junction temperature must
be within the range specified under absolute
maximum ratings. To determine if the heatsink is
required, the power dissipated by the regulator, PD
must be calculated.
The below formula shows the voltages and currents
for calculating the PD in the regulator:
Iin = IL / IG
PD = (Vin-Vout) * IL + (Vin) * IG
Ex. PD = (3.3V-2.5V) * 1A + 3.3V * 11mA
= 800mW + 36mW
= 836mW
Remark: IL is output load current,
IG is ground current.
Vin is input voltage
Vout is output voltage
TS2940
3-6 2003/12 rev. B


3Pages


TS2940 電子部品, 半導体
TO-252 Mechanical Drawing
JE
TO-252 DIMENSION
A
F
DIM
MILLIMETERS
MIN MAX
INCHES
MIN MAX
A 6.570 6.840 0.259 0.269
I
B
B 9.250 10.400 0.364 0.409
C 0.550 0.700 0.022 0.028
D 2.560 2.670 0.101 0.105
E 2.300 2.390 0.090 0.094
F 0.490 0.570 0.019 0.022
G 1.460 1.580 0.057 0.062
G H 0.520 0.570 0.020 0.022
DC
H
I
5.340
5.550
0.210
0.219
J
1.460
1.640
0.057
0.065
SOT-223 Mechanical Drawing
A
B
HC
F
G
E
D
I
J
K
SOT-223 DIMENSION
DIM
MILLIMETERS
MIN MAX
INCHES
MIN MAX
A 6.350 6.850 0.250 0.270
B 2.900 3.100 0.114 0.122
C 3.450 3.750 0.136 0.148
D 0.595 0.635 0.023 0.025
E 4.550 4.650 0.179 0.183
F 2.250 2.350 0.088 0.093
G 0.835 1.035 0.032 0.041
H 6.700 7.300 0.263 0.287
I
0.250
0.355
0.010
0.014
J 10° 16° 10° 16°
K 1.550 1.800 0.061 0.071
TS2940
6-6 2003/12 rev. B

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