UC1-2 [TI]
Fast LDO Linear Regulator; 快速LDO线性稳压器
| 型号： | UC1-2 |
| 厂家： | 
TEXAS INSTRUMENTS |
| 描述： | Fast LDO Linear Regulator |
| 文件： | 总6页 (文件大小：188K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
UC182-1,-2,-3,-ADJ
UC282-1,-2,-3,-ADJ
UC382-1,-2,-3,-ADJ
Fast LDO Linear Regulator
DESCRIPTION
FEATURES
• Fast Transient Response
The UC382 is a low dropout linear regulator providing a quick response to
fast load changes. Combined with its precision on-board reference, the
UC382 excels at driving GTL and BTL buses. Due to its fast response to
load transients, the total capacitance required to decouple the regulator’s
output can be significantly decreased when compared to standard LDO lin-
ear regulators.
• 10mA to 3A Load Current
• Short Circuit Protection
• Maximum Dropout of 450mV at 3A
Load Current
Dropout voltage (VIN to VOUT) is only 450mV maximum at 100°C and
350mV typical at 3A load.
• Separate Bias and VIN Pins
• Available in Adjustable or Fixed
Output Voltages
The on-board bandgap reference is stable with temperature and scaled for
a 1.200V input to the internal power amplifier. The UC382 is available in
fixed output voltages of 1.5V, 2.1V, or 2.5V. The output voltage of the adjust-
able version can be set with two external resistors. If the external resistors
are omitted, the output voltage defaults to 1.2V.
• 5 Pin Package allows Kelvin Sensing
of Load Voltage
• Reverse Current Protection
BLOCK DIAGRAM
UDG-96037-1
SLUS317 - J ANUARY 1999
UC182-1,-2,-3,-ADJ
UC282-1,-2,-3,-ADJ
UC382-1,-2,-3,-ADJ
ABSOLUTE MAXIMUM RATINGS
ORDERING INFORMATION
VB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13V
VIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +7.5V
Output Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . +1.2V to 6.0V
Storage Temperature . . . . . . . . . . . . . . . . . . . –65°C to +150°C
Junction Temperature. . . . . . . . . . . . . . . . . . . –55°C to +150°C
Lead Temperature (Soldering, 10 sec.) . . . . . . . . . . . . . +300°C
Temperature Range
Package
Output Voltage
Currents are positive into, negative out of the specified termi-
nal. Consult Packaging Section of Databook for thermal limita-
tions and considerations of packages.
1: –55°C to +125°C T: TO-220
1: 1.5V
2: –25°C to +100°C TD: TO-263 2: 2.1V
3: 0°C to +100°C
3: 2.5V
ADJ: 1.2V or Adjustable
CONNECTION DIAGRAMS
5-Pin TO-220 (Top View)
T Package
5-Pin TO-263 (Top View)
TD Package
Note: Tab tied to Pin 3.
Note: Tab tied to Pin 3.
ELECTRICAL CHARACTERISTICS: Unless otherwise stated, these parameters apply for TA = –55°C to 125°C for the
UC182-X series, –25°C to +100°C for the UC282-X series and 0°C to +100°C for the UC382-X, VB = 5V; VIN = 3.3V, VOUT =
2.5V for the UC382-ADJ, TA = TJ.
PARAMETERS
UC382-3 Fixed 2.5V, 3A Family
Output Voltage (IVOUT = 100mA)
TEST CONDITIONS
MIN
TYP
MAX UNITS
UC382-3
2.475 2.500 2.525
2.450 2.500 2.525
V
V
UC282-3 and UC182-3
IVOUT = 10mA to 3A
Load Regulation
VIN PSSR
0.5
100
60
4
mV
dB
dB
mV
mV
mV
V
80
50
VB PSSR
VIN Dropout Voltage = VIN–VOUT
IVOUT = 3A, TJ = 25°C
IVOUT = 3A, UC382-3
350
350
350
1.8
1.8
1.8
425
450
500
2.10
2.20
2.35
4.5
IVOUT = 3A, UC282-3 and UC182-3
IVOUT = 3A, UC382-3
VB Dropout = VB–VOUT
IVOUT = 3A, UC282-3
V
IVOUT = 3A, UC182-3
V
Short Circuit Current Limit
VB Current
3.3
A
IVOUT = 10mA
IVOUT = 3A
IVOUT = 3A
6
9
mA
mA
A
18
60
VIN Current
2.94
2.97
UC382-2 Fixed 2.1V, 3A Family
Output Voltage (IVOUT = 100mA)
UC382-2
2.079 2.100 2.121
2.058 2.100 2.121
V
V
UC282-2 and UC182-2
IVOUT = 10mA to 3A
Load Regulation
VIN PSSR
0.5
4
mV
dB
80
100
2
UC182-1,-2,-3,-ADJ
UC282-1,-2,-3,-ADJ
UC382-1,-2,-3,-ADJ
ELECTRICAL CHARACTERISTICS: Unless otherwise stated, these parameters apply for TA = –55°C to 125°C for the
UC182-X series, –25°C to +100°C for the UC282-X series and 0°C to +100°C for the UC382-X, VB = 5V; VIN = 3.3V, VOUT =
2.5V for the UC382-ADJ, TA = TJ.
PARAMETERS
UC382-2 Fixed 2.1V, 3A Family (cont.)
VB PSSR
TEST CONDITIONS
MIN
TYP
MAX UNITS
52
62
350
350
350
1.8
1.8
1.8
dB
VIN Dropout Voltage = VIN–VOUT
IVOUT = 3A, TJ = 25°C
425
450
500
2.10
2.20
2.35
4.5
mV
mV
mV
V
IVOUT = 3A, UC382-2
IVOUT = 3A, UC282-2 and UC182-2
IVOUT = 3A, UC382-2
VB Dropout = VB–VOUT
IVOUT = 3A, UC282-2
V
IVOUT = 3A, UC182-2
V
Short Circuit Current Limit
VB Current
3.3
A
IVOUT = 10mA
IVOUT = 3A
IVOUT = 3A
6
9
mA
mA
A
18
60
VIN Current
2.94
2.97
UC382-1 Fixed 1.5V, 3A Family
Output Voltage (IVOUT = 100mA)
UC382-1
1.485 1.500 1.515
1.470 1.500 1.515
V
V
UC282-1 and UC182-1
IVOUT = 10mA to 3A
Load Regulation
VIN PSSR
0.5
100
65
4
mV
dB
dB
mV
mV
mV
V
80
55
VB PSSR
VIN Dropout Voltage = VIN–VOUT
IVOUT = 3A, TJ = 25°C
IVOUT = 3A, UC282-1
350
350
350
1.8
1.8
1.8
425
450
500
2.10
2.20
2.35
4.5
IVOUT = 3A, UC282-2 and UC182-1
IVOUT = 3A, UC382-1
VB Dropout = VB–VOUT
IVOUT = 3A, UC282-1
V
IVOUT = 3A, UC182-1
V
Short Circuit Current Limit
VB Current
3.3
A
IVOUT = 10mA
IVOUT = 3A
IVOUT = 3A
6
9
mA
mA
A
18
60
VIN Current
2.94
2.97
UC382-ADJ Adjustable, 3A Family
ADJ Voltage (IVOUT = 100 mA)
UC382-ADJ
1.188 1.200 1.212
1.176 1.200 1.212
V
V
UC282-ADJ and UC182-ADJ
IVOUT = 10mA to 3A
Load Regulation
VIN PSSR
0.5
100
60
4
mV
dB
dB
mV
mV
mV
V
VOUT Programmed for 2.5V
VOUT Programmed for 2.5V
IVOUT = 3A, TJ = 25°C
80
50
VB PSSR
VIN Dropout Voltage = VIN–VOUT
350
350
350
1.8
1.8
425
450
500
2.10
2.20
4.5
9
IVOUT = 3A, UC382-ADJ
IVOUT = 3A, UC282-ADJ and UC182-ADJ
IVOUT = 3A, UC382-ADJ
IVOUT = 3A, UC282-ADJ
VB Dropout = VB–VOUT
V
Short Circuit Current Limit
VB Current
3.3
A
IVOUT = 10mA
IVOUT = 3A
IVOUT = 3A
6
mA
mA
A
18
60
VIN Current
2.94
2.97
3
UC182-1,-2,-3,-ADJ
UC282-1,-2,-3,-ADJ
UC382-1,-2,-3,-ADJ
PIN DESCRIPTIONS
impedance and fast response. (Dropout is derated for
junction temperatures below 0°C.)
ADJ: In the adjustable version, the user programs the
output voltage with two external resistors. The resistors
should be 0.1% for high accuracy. The output amplifier is
configured as a non-inverting operational amplifier. The
resistors should meet the criteria of R3 || R4 < 100Ω.
Connect ADJ to VOUT for an output voltage of 1.2V. Note
that the point at which the feedback network is
connected to the output is the Kelvin sense point.
VIN: Supplies the current to the collector of the output
power transistor only. The dropout (VIN-VOUT) is under
100mV for light loads; maximum dropout is 450mV at 3A
for TJ = 0°C to +110°C. (Dropout is derated for junction
temperatures over 110°C.) At full load, the majority of the
VB current is going to the load.
GND: For accurate results, the GND pin should be
referenced to the load ground.
VOUT: This pin should be connected to the load via a
low impedance path. Avoid connectors which add
significant inductance and resistance. Note that even
though a Kelvin sense is available through a 5 pin
package, care must be taken since voltage drops along
wire traces add to the dropout voltage.
VB: Supplies power to all circuits of the regulator except
the collector of the output power transistor. The 2V
headroom from VB to VOUT allows the use of a
Darlington output stage for inherently low output
1.9
1.8
1.7
1.6
400
300
200
100
100mA
3A
1A
2A
0
1
2
3
IL
IL (A)
Figure 2. Typical Dropout (V - V
), T = 27°C
J
Figure 1. Typical Dropout (V - V
), T = 27°C
IN
OUT
B
OUT
J
APPLICATION INFORMATION
The UC382 is easy to use. The adjustable version re- will vary according to speed and magnitude of the load
quires two 0.1% resistors to set the output voltage. The transients and the tolerance allowed for transients on
fixed versions of the UC382 require no external resistors. VOUT. When specifying the decoupling capacitors, the
All versions of the UC382 require decoupling capacitors series resistance of the capacitor bank is an important
on the input and output. In a typical application, VB and factor in its ability to filter load transients.
VIN are driven from switching power supplies which may
The UC382 allows for Kelvin sensing the voltage at the
have large filter capacitors at their outputs. If the UC382
load. This improves regulation performance and elimi-
is further than 12 inches from the power supply, it is rec-
nates the voltage drops due to wire trace resistance. This
ommended to add local decoupling as close as possible
voltage drop must be added to the headroom (VIN to
VOUT and VB to VOUT). The dropout of 450mV is mea-
to the linear regulator.
sured at the pins and does not include additional drops
due to trace resistance. The minimum load current is
10mA.
Decouple the output of the UC382 with at least 100µF of
high quality tantalum or Sanyo OSCON capacitors close
to the VOUT pin for maximum stability. Many applications
involving ultra fast GTL or BTL applications require addi-
tional capacitance close to the load. The exact amount
Two or more UC382’s may be used in parallel. While sta-
ble, this arrangement does degrade the transient re-
sponse.
4
UC182-1,-2,-3,-ADJ
UC282-1,-2,-3,-ADJ
UC382-1,-2,-3,-ADJ
APPLICATION INFORMATION (cont.)
Figure 3. Open Loop Gain (100µF Output
Capacitance, 1A Load).
Figure 4. Open Loop Phase (100µF Output
Capacitance, 1A Load).
60
50
40
30
20
10
0
100
1k
10k
100k
1M
10M
FREQUENCY (Hz)
Figure 5. PSRR (V ) 2.5V Out.
B
UDG-96038
Figure 6. Transient test circuit.
5
UC182-1,-2,-3,-ADJ
UC282-1,-2,-3,-ADJ
UC382-1,-2,-3,-ADJ
APPLICATION INFORMATION (cont.)
∆V
O
10mV/DIV
I
L
1A/DIV
2µs/DIV
Figure 7. 10mA to 3A/µs load transient response.
UDG-96039
UDG-96040
Figure 8. Typical UC382-ADJ application
Figure 9. Typical UC382-1, -2, or -3 application
UNITRODE CORPORATION
7 CONTINENTAL BLVD. • MERRIMACK, NH 03054
TEL. (603) 424-2410 FAX (603) 424-3460
6
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