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Datasheet> All Categories > Power/power management> The power supply circuit> UCC281DPTR-ADJ
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UCC281DPTR-ADJ

Description
1.22 V-1.28V ADJUSTABLE POSITIVE LDO REGULATOR, 0.6V DROPOUT, PDSO8, GREEN, SOIC-8
CategoryPower/power management    The power supply circuit   
File Size956KB，13 Pages
ManufacturerRochester Electronics
Websitehttps://www.rocelec.com/
Environmental Compliance  
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UCC281DPTR-ADJ Overview

1.22 V-1.28V ADJUSTABLE POSITIVE LDO REGULATOR, 0.6V DROPOUT, PDSO8, GREEN, SOIC-8

UCC281DPTR-ADJ Parametric

Parameter NameAttribute value
Is it lead-free?Lead free
MakerRochester Electronics
Parts packaging codeSOIC
package instructionGREEN, SOIC-8
Contacts8
Reach Compliance Codeunknow
Maximum drop-back voltage 10.6 V
JESD-30 codeR-PDSO-G8
JESD-609 codee4
length4.9 mm
Humidity sensitivity level2
Number of functions1
Number of terminals8
Working temperatureTJ-Max150 °C
Operating temperatureTJ-Mi-55 °C
Maximum output current 11 A
Maximum output voltage 11.28 V
Minimum output voltage 11.22 V
Package body materialPLASTIC/EPOXY
encapsulated codeSOP
Package shapeRECTANGULAR
Package formSMALL OUTLINE
Peak Reflow Temperature (Celsius)260
Certification statusCOMMERCIAL
Regulator typeADJUSTABLE POSITIVE SINGLE OUTPUT LDO REGULATOR
Maximum seat height1.75 mm
surface mountYES
technologyBICMOS
Terminal surfaceNICKEL PALLADIUM GOLD
Terminal formGULL WING
Terminal pitch1.27 mm
Terminal locationDUAL
Maximum time at peak reflow temperatureNOT SPECIFIED
width3.9 mm

UCC281DPTR-ADJ Preview

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UCC281-3/-5/-ADJ
UCC381-3/-5/-ADJ
Low Dropout 1 Ampere Linear Regulator Family
FEATURES
•
Precision Positive Linear Voltage
Regulation
•
0.5V Dropout at 1A
•
Guaranteed Reverse Input/ Output
Voltage Isolation with Low Leakage
•
Low Quiescent Current Irrespective of
Load
•
Adjustable Output Voltage Version
•
Fixed Versions for 3.3V and 5V
Outputs
•
Logic Shutdown Capability
•
Short Circuit Power Limit of
3%
•
V
IN
•
Current Limit
•
Remote Load Voltage for Accurate
Load Regulation
DESCRIPTION
The UCC381-3/-5/-ADJ family of positive linear series pass regulators is
tailored for low drop out applications where low quiescent power is impor-
tant. Fabricated with a BiCMOS technology ideally suited for low input to
output differential applications, the UCC381 will pass 1A while requiring
only 0.5V of input voltage headroom. Dropout voltage decreases linearly
with output current, so that dropout at 200mA is less than 100mV. Quies-
cent current is always less than 650µA. To prevent reverse current conduc-
tion, on-chip circuitry limits the minimum forward voltage to typically 50mV.
Once the forward voltage limit is reached, the input-output differential volt-
age is maintained as the input voltage drops until undervoltage lockout dis-
ables the regulator.
UCC381-3 and UCC381-5 versions have on-chip resistor networks preset
to regulate either 3.3V or 5.0V, respectively. Furthermore, remote sensing
of the load voltage is possible by connecting the VOUTS pin directly at the
load. The output voltage is then regulated to 1.5% at room temperature and
better than 2.5% over temperature. The UCC381-ADJ version has a regu-
lated output voltage programmed by an external user-definable resistor ra-
tio.
(continued)
BLOCK DIAGRAM
VIN
8
V
PUMP
CURRENT
LIMIT
1.3/2.1A
CURRENT
REFERENCE
–
+
VOLTAGE
AMPLIFIER
–
+
R2
1
4
VOUT
VOUTS
2
1.25V
3
R1
6
GND
GND
GND
GND
SHUTDOWN FOR FIXED VERSIONS
CT*
5
0.65V
3% DUTY CYCLE
CURRENT LIMIT TIMER
REVERSE VOLTAGE
SENSE
UVLO
THERMAL
SHUTDOWN
R2
UCC381-ADJ
UCC381-3
UCC381-5
7
*ADJ
VERSION
ONLY
R1
0 OPEN
82k
150k
50k
50k
UDG-98112
SLUS214B -JANUARY
2001
UCC281-3/-5/-ADJ
UCC381-3/-5/-ADJ
ABSOLUTE MAXIMUM RATINGS
VIN. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9V
CT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
−0.3
to 3V
Storage Temperature . . . . . . . . . . . . . . . . . . .
−65°C
to +150°C
Junction Temperature . . . . . . . . . . . . . . . . . . .
−55°C
to +150°C
Lead Temperature (Soldering, 10 sec.) . . . . . . . . . . . . . +300°C
CONNECTION DIAGRAMS
SOIC-8 (Top View)
DP Package
VOUT
GND
GND
VOUTS
1
2
3
4
8
7
6
5
VIN
GND
GND
CT*
Currents are positive into, negative out of the specified terminal.
Consult Packaging Section of Databook for thermal limitations
and considerations of packages. All voltages are referenced to
GND.
* ADJ version only
DESCRIPTION (cont.)
Short circuit current is internally limited. The device re-
sponds to a sustained overcurrent condition by turning
off after a T
ON
delay. The device then stays off for a pe-
riod, T
OFF
, that is 32 times the T
ON
delay. The device
then begins pulsing on and off at the T
ON
/(T
ON
+T
OFF
)
duty cycle of 3%. This drastically reduces the power dis-
sipation during short circuit such that heat sinking, if at all
required, must only accommodate normal operation. On
the fixed output versions of the device T
ON
is fixed at
400µs
−
a guaranteed minimum. On the adjustable ver-
sion an external capacitor sets the on time. The off time
is always 32 times T
ON
.
The UCC381 can be shutdown to 25µA (max) by pulling
the CT pin low.
Internal power dissipation is further controlled with ther-
mal overload protection circuitry. Thermal shutdown oc-
curs if the junction temperature exceeds 165°C. The chip
will remain off until the temperature has dropped 20°C.
The UCC281 series is specified for operation over the in-
dustrial range of
−40°C
to +85°C, and the UCC381 se-
ries is specified from 0°C to +70°C. These devices are
available in the 8 pin DP surface mount power package.
For other packaging options consult the factory.
UCC381-X series and
−40°C
to +85°C for the UCC283-X series, V
IN
= V
OUT
+ 1.5V, I
OUT
= 0mA, C
OUT
= 2.2µF. C
T
= 1500pF for
the UCC381-ADJ version and V
OUT
set to 5V. T
J
= T
A
.
PARAMETER
UCC381-5 Fixed 5V, 1A Family
Output Voltage
Line Regulation
Load Regulation
Drop Out Voltage, V
IN
– V
OUT
Peak Current Limit
Overcurrent Threshold
Current Limit Duty Cycle
Overcurrent Time Out, T
ON
Quiescent Current
Quiescent Current in Shutdown
Shutdown Threshold
Reverse Leakage Current
UVLO Threshold
V
IN
= 9V
At C
T
Input
1V < V
IN
< V
OUT
, V
OUT
< 5.1V, at V
OUT
V
IN
where V
OUT
passes current
2.5
2.8
0.25
V
OUT
= 0V
V
OUT
= 0V
400
T
J
= 25°C
Over Temperature
V
IN
= 5.15V to 9V
I
OUT
= 0mA to 1A
I
OUT
= 1A, V
OUT
= 4.85V, TA < 85°C
I
OUT
= 200mA, V
OUT
= 4.85V, TA < 85°C
V
OUT
= 0V
1
3
750
400
10
0.65
75
3.0
4.925
4.875
1
2
0.5
100
2
5
5.075
5.125
3
5
0.6
200
3.5
1.8
5
1600
650
25
V
V
mV
mV
V
mV
A
A
%
µs
µA
µA
V
µA
V
TEST CONDITIONS
MIN
TYP
MAX UNITS
ELECTRICAL CHARACTERISTICS:
Unless otherwise stated, these specifications hold for T
A
= 0°C to 70°C for the
2
UCC281-3/-5/-ADJ
UCC381-3/-5/-ADJ
ELECTRICAL CHARACTERISTICS:
Unless otherwise stated, these specifications hold for T
A
= 0°C to 70°C for the
PARAMETER
UCC381-3 Fixed 3.3V, 1A Family
Output Voltage
Line Regulation
Load Regulation
Dropout Voltage, V
IN
- V
OUT
Peak Current Limit
Overcurrent Threshold
Current Limit Duty Cycle
Overcurrent Time Out, T
ON
Quiescent Current
Quiescent Current in Shutdown
Shutdown Threshold
Reverse Leakage Current
UVLO Threshold
UCC381-ADJ Adjustable Output, 1A Family
Regulating Voltage at ADJ Input
Line Regulation, at ADJ Input
Load Regulation, at ADJ Input
Dropout Voltage, V
IN
- V
OUT
Peak Current Limit
Overcurrent Threshold
Current Limit Duty Cycle
Overcurrent Time Out, T
ON
Quiescent Current
Quiescent Current in Shutdown
Shutdown Threshold
Reverse Leakage Current
Bias Current at ADJ Input
UVLO Threshold
V
IN
where V
OUT
passes current
2.5
V
IN
= 9V
At C
T
Input
1V < V
IN
< V
OUT
, V
OUT
< 9V, at V
OUT
100
2.8
0.25
V
OUT
= 0V
V
OUT
= 0V, C
T
= 1500pF
400
T
J
= 25°C
Over Temperature
V
IN
= V
OUT
+ 150mV to 9V
I
OUT
= 0mA to 1A
I
OUT
= 1A, V
OUT
= 4.85V
I
OUT
= 200mA, V
OUT
= 4.85V
V
OUT
= 0V
1
3
1000
400
10
0.65
100
250
3.0
1.23
1.22
1
2
0.5
100
2
1.25
1.27
1.28
3
5
0.6
200
3.5
1.8
5
1600
650
25
V
V
mV
mV
V
mV
A
A
%
µs
µA
µA
V
µA
nA
V
V
IN
= 9V
At C
T
Input
1V < V
IN
< V
OUT
, V
OUT
< 3.35V, at V
OUT
V
IN
where V
OUT
passes current
2.5
2.8
0.25
V
OUT
= 0V
V
OUT
= 0V
400
T
J
= 25°C
Over Temperature
V
IN
= 3.45V to 9V
I
OUT
= 0mA to 1A
I
OUT
= 1A, V
OUT
= 3.15V, T
A
< 85°C
I
OUT
= 200mA, V
OUT
= 3.15V, T
A
< 85°C
V
OUT
= 0V
1
3
750
400
10
0.65
75
3.0
3.25
3.22
1
2
0.6
100
2
3.3
3.35
3.38
3
5
0.8
200
3.5
1.8
5
1600
650
25
V
V
mV
mV
V
mV
A
A
%
µs
µA
µA
V
µA
V
TEST CONDITIONS
MIN
TYP
UCC381-X series and
−40°C
to +85°C for the UCC283-X series, V
IN
= V
OUT
+ 1.5V, I
OUT
= 0mA, C
OUT
= 2.2µF. C
T
= 1500pF for
the UCC381-ADJ version and V
OUT
set to 5V. T
J
= T
A
.
MAX UNITS
3
UCC281-3/-5/-ADJ
UCC381-3/-5/-ADJ
PIN DESCRIPTIONS
CT:
For UCC381-3 and UCC381-5 versions, this is the
shutdown pin which, when pulled low, turns off the regu-
lator output and puts the device in a low current state.
For the UCC381-ADJ version, a capacitor is required be-
tween the CT pin and GND to set the T
ON
time during
overcurrent according to the following (typical) equation:
spect to the required transient loading. For example, if
the load is very dynamic, a large capacitor will smooth
out the response to load steps.
VOUTS:
Feedback for regulator sensing of the output
voltage. For loads which are a considerable resistive dis-
tance from the VOUT pin, the VOUTS pin can be used to
move the resistance into the control loop of the regulator,
thereby effectively canceling the IR drop associated with
the load path. For local regulation, merely connect this
pin directly to the VOUT pin. For the UCC381-ADJ ver-
sion, the output voltage can be set by two external resi-
tors according to the following relationship:
T
ON
=
660 ,000
•
C
CT
GND:
All voltages are measured with respect to this pin.
This is the low noise ground reference input for regula-
tion. The output decoupling capacitor should be tied to
PIN 7.
VIN:
Positive supply input for the regulator. Bypass this
pin to GND with at least 1µF of low ESR, ESL capaci-
tance if the source is located further than 1 inch from the
device.
VOUT:
Output for regulator. The regulator does not re-
quire a minimum output capacitor for stability. Choose
the appropriate size capacitor for the application with re-
R
2
V
OUT
=
1. 25
• 
1
+
R
1
where R1 is a resistor connected between VOUT and
VOUTS and R2 is a resistor connected between VOUTS
and GND.
TYPICAL APPLICATION CIRCUIT
SHUTDOWN
C
T
NOTE 2
R2
NOTE 1
VOUTS
5
CT
V
IN
4
R1
NOTE 1
8
VIN
UCC381
VOUT
1
C
OUT
OUTPUT
1.0µF
GND
GND
GND
GND
7
6
3
2
UDG-98148
Note 1: R1 and R2 for adjustable version only. For 3.3V and 5V versions connect VOUT to VOUTS. See Pin Descriptions.
Note 2: C
T
timing capacitor is for adjustable version only. For 3.3V and 5V versions, the CT pin is used to enable or shutdown
the part. See Pin Descriptions.
4
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Description 1.22 V-1.28V ADJUSTABLE POSITIVE LDO REGULATOR, 0.6V DROPOUT, PDSO8, GREEN, SOIC-8 5V FIXED POSITIVE LDO REGULATOR, 0.6V DROPOUT, PDSO8, GREEN, SOIC-8 5V FIXED POSITIVE LDO REGULATOR, 0.6V DROPOUT, PDSO8, GREEN, SOIC-8 3.3V FIXED POSITIVE LDO REGULATOR, 0.8V DROPOUT, PDSO8, GREEN, SOIC-8 3.3V FIXED POSITIVE LDO REGULATOR, 0.8V DROPOUT, PDSO8, GREEN, SOIC-8 5V FIXED POSITIVE LDO REGULATOR, 0.6V DROPOUT, PDSO8, GREEN, SOIC-8 1.22 V-1.28V ADJUSTABLE POSITIVE LDO REGULATOR, 0.6V DROPOUT, PDSO8, GREEN, SOIC-8 1.22 V-1.28V ADJUSTABLE POSITIVE LDO REGULATOR, 0.6V DROPOUT, PDSO8, GREEN, SOIC-8 1.22 V-1.28V ADJUSTABLE POSITIVE LDO REGULATOR, 0.6V DROPOUT, PDSO8, GREEN, SOIC-8 5V FIXED POSITIVE LDO REGULATOR, 0.6V DROPOUT, PDSO8, GREEN, SOIC-8
Is it lead-free? Lead free Lead free Lead free Lead free Lead free Lead free Lead free Lead free Lead free Lead free
Maker Rochester Electronics Rochester Electronics Rochester Electronics Rochester Electronics Rochester Electronics Rochester Electronics Rochester Electronics Rochester Electronics Rochester Electronics Rochester Electronics
Parts packaging code SOIC SOIC SOIC SOIC SOIC SOIC SOIC SOIC SOIC SOIC
package instruction GREEN, SOIC-8 GREEN, SOIC-8 GREEN, SOIC-8 GREEN, SOIC-8 GREEN, SOIC-8 GREEN, SOIC-8 GREEN, SOIC-8 GREEN, SOIC-8 GREEN, SOIC-8 GREEN, SOIC-8
Contacts 8 8 8 8 8 8 8 8 8 8
Reach Compliance Code unknow unknown unknown unknown unknown unknown unknow unknow unknow unknow
Maximum drop-back voltage 1 0.6 V 0.6 V 0.6 V 0.8 V 0.8 V 0.6 V 0.6 V 0.6 V 0.6 V 0.6 V
JESD-30 code R-PDSO-G8 R-PDSO-G8 R-PDSO-G8 R-PDSO-G8 R-PDSO-G8 R-PDSO-G8 R-PDSO-G8 R-PDSO-G8 R-PDSO-G8 R-PDSO-G8
JESD-609 code e4 e4 e4 e4 e4 e4 e4 e4 e4 e4
length 4.9 mm 4.9 mm 4.9 mm 4.9 mm 4.9 mm 4.9 mm 4.9 mm 4.9 mm 4.9 mm 4.9 mm
Humidity sensitivity level 2 2 2 2 2 2 2 2 2 2
Number of functions 1 1 1 1 1 1 1 1 1 1
Number of terminals 8 8 8 8 8 8 8 8 8 8
Working temperatureTJ-Max 150 °C 150 °C 150 °C 150 °C 150 °C 150 °C 150 °C 150 °C 150 °C 150 °C
Maximum output current 1 1 A 1 A 1 A 1 A 1 A 1 A 1 A 1 A 1 A 1 A
Maximum output voltage 1 1.28 V 5.125 V 5.125 V 3.38 V 3.38 V 5.125 V 1.28 V 1.28 V 1.28 V 5.125 V
Minimum output voltage 1 1.22 V 4.875 V 4.875 V 3.22 V 3.22 V 4.875 V 1.22 V 1.22 V 1.22 V 4.875 V
Package body material PLASTIC/EPOXY PLASTIC/EPOXY PLASTIC/EPOXY PLASTIC/EPOXY PLASTIC/EPOXY PLASTIC/EPOXY PLASTIC/EPOXY PLASTIC/EPOXY PLASTIC/EPOXY PLASTIC/EPOXY
encapsulated code SOP SOP SOP SOP SOP SOP SOP SOP SOP SOP
Package shape RECTANGULAR RECTANGULAR RECTANGULAR RECTANGULAR RECTANGULAR RECTANGULAR RECTANGULAR RECTANGULAR RECTANGULAR RECTANGULAR
Package form SMALL OUTLINE SMALL OUTLINE SMALL OUTLINE SMALL OUTLINE SMALL OUTLINE SMALL OUTLINE SMALL OUTLINE SMALL OUTLINE SMALL OUTLINE SMALL OUTLINE
Peak Reflow Temperature (Celsius) 260 260 260 260 260 260 260 260 260 260
Certification status COMMERCIAL COMMERCIAL COMMERCIAL COMMERCIAL COMMERCIAL COMMERCIAL COMMERCIAL COMMERCIAL COMMERCIAL COMMERCIAL
Regulator type ADJUSTABLE POSITIVE SINGLE OUTPUT LDO REGULATOR FIXED POSITIVE SINGLE OUTPUT LDO REGULATOR FIXED POSITIVE SINGLE OUTPUT LDO REGULATOR FIXED POSITIVE SINGLE OUTPUT LDO REGULATOR FIXED POSITIVE SINGLE OUTPUT LDO REGULATOR FIXED POSITIVE SINGLE OUTPUT LDO REGULATOR ADJUSTABLE POSITIVE SINGLE OUTPUT LDO REGULATOR ADJUSTABLE POSITIVE SINGLE OUTPUT LDO REGULATOR ADJUSTABLE POSITIVE SINGLE OUTPUT LDO REGULATOR FIXED POSITIVE SINGLE OUTPUT LDO REGULATOR
Maximum seat height 1.75 mm 1.75 mm 1.75 mm 1.75 mm 1.75 mm 1.75 mm 1.75 mm 1.75 mm 1.75 mm 1.75 mm
surface mount YES YES YES YES YES YES YES YES YES YES
technology BICMOS BICMOS BICMOS BICMOS BICMOS BICMOS BICMOS BICMOS BICMOS BICMOS
Terminal surface NICKEL PALLADIUM GOLD NICKEL PALLADIUM GOLD NICKEL PALLADIUM GOLD NICKEL PALLADIUM GOLD NICKEL PALLADIUM GOLD NICKEL PALLADIUM GOLD NICKEL PALLADIUM GOLD NICKEL PALLADIUM GOLD NICKEL PALLADIUM GOLD NICKEL PALLADIUM GOLD
Terminal form GULL WING GULL WING GULL WING GULL WING GULL WING GULL WING GULL WING GULL WING GULL WING GULL WING
Terminal pitch 1.27 mm 1.27 mm 1.27 mm 1.27 mm 1.27 mm 1.27 mm 1.27 mm 1.27 mm 1.27 mm 1.27 mm
Terminal location DUAL DUAL DUAL DUAL DUAL DUAL DUAL DUAL DUAL DUAL
Maximum time at peak reflow temperature NOT SPECIFIED NOT SPECIFIED NOT SPECIFIED NOT SPECIFIED NOT SPECIFIED NOT SPECIFIED NOT SPECIFIED NOT SPECIFIED NOT SPECIFIED NOT SPECIFIED
width 3.9 mm 3.9 mm 3.9 mm 3.9 mm 3.9 mm 3.9 mm 3.9 mm 3.9 mm 3.9 mm 3.9 mm
Maximum input voltage - 9 V 9 V 9 V 9 V 9 V - - - 9 V
Minimum input voltage - 5.15 V 5.15 V 3.45 V 3.45 V 5.15 V - - - 5.15 V
Nominal output voltage 1 - 5 V 5 V 3.3 V 3.3 V 5 V - - - 5 V

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Please look at this 51 program, what is wrong?
This is a 50-second timer. We want to use external interrupts to form a countdown. #include#define GPIO_DIG P0 sbit LSA=P2^2; sbit LSB=P2^3; sbit LSC=P2^4; code unsigned char sag[10]={0x3F,0x06,0x5B,0...
曹云鹏 51mcu
Tell us about the biggest obstacle you encountered when learning with Mini2440~~
We have organized a group purchase of Mini2440 development boards before, and we sincerely hope that we can help everyone learn and master this board through the power of friends in the forum. If we s...
soso Embedded System
ST32M105 serial port 4 not working
I'd like to ask the moderator, has anyone used the serial port 4 of ST32M105? I used it in my project, but it doesn't work. However, the other serial ports 1, 2, and 3 work well. I transplanted it fro...
tanta stm32/stm8
Another application of CC1101 wireless module (wireless temperature and humidity monitoring system-RF transmitter)
I just finished this project recently, which took me one month to complete. I would like to share it with you. (Another application based on CC1101 wireless module) This product uses CC1101 wireless m...
zhaofaohua RF/Wirelessly
Photoelectric detection technology
[i=s]This post was last edited by qwqwqw2088 on 2020-2-23 18:08[/i]Photoelectric detection technology has a wide range of applications in many fields, from simple infrared sensors to fiber optic commu...
qwqwqw2088 Analogue and Mixed Signal
Problems with downloading hex files from sensorTag
[i=s]This post was last edited by wwwenl on 2014-7-16 16:50[/i] I got the sensorTag today and installed it. After connecting it to CC Debugger, I used Flash Programmer to burn the hex file. All of the...
wwwenl Wireless Connectivity
Shortcut:   A0 A1 A2 A3 A4 A5 A6 A7 A8 A9 AA AB AC AD AE AF AG AH AI AJ AK AL AM AN AO AP AQ AR AS AT AU AV AW AX AY AZ B0 B1 B2 B3 B4 B5 B6 B7 B8 B9 BA BB BC BD BE BF BG BH BI BJ BK BL BM BN BO BP BQ BR BS BT BU BV BW BX BY BZ C0 C1 C2 C3 C4 C5 C6 C7 C8 C9 CA CB CC CD CE CF CG CH CI CJ CK CL CM CN CO CP CQ CR CS CT CU CV CW CX CY CZ D0 D1 D2 D3 D4 D5 D6 D7 D8 D9 DA DB DC DD DE DF DG DH DI DJ DK DL DM DN DO DP DQ DR DS DT DU DV DW DX DZ

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