TI UCC381DP-5

UCC281-3/-5/-ADJ
UCC381-3/-5/-ADJ
Low Dropout 1 Ampere Linear Regulator Family
FEATURES
DESCRIPTION
• Precision Positive Linear Voltage
Regulation
The UCC381-3/-5/-ADJ family of positive linear series pass regulators is
tailored for low drop out applications where low quiescent power is important. 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. Quiescent current is always less than 650µA. To prevent reverse current conduction, on-chip circuitry limits the minimum forward voltage to typically 50mV.
Once the forward voltage limit is reached, the input-output differential voltage is maintained as the input voltage drops until undervoltage lockout disables the regulator.
• 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
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 regulated output voltage programmed by an external user-definable resistor ratio.
• Logic Shutdown Capability
• Short Circuit Power Limit of
3% • VIN • Current Limit
• Remote Load Voltage for Accurate
Load Regulation
(continued)
BLOCK DIAGRAM
VIN
8
VPUMP
VOLTAGE
AMPLIFIER
CURRENT
LIMIT
1.3/2.1A
CURRENT
REFERENCE
4
VOUTS
2
GND
3
GND
6
GND
7
GND
–
–
+
+
SHUTDOWN FOR FIXED VERSIONS
R1
5
0.65V
*ADJ
VERSION
ONLY
VOUT
R2
1.25V
CT*
1
3% DUTY CYCLE
CURRENT LIMIT TIMER
R2
REVERSE VOLTAGE
SENSE
UCC381-ADJ
UVLO
THERMAL
SHUTDOWN
R1
0 OPEN
UCC381-3
82k
50k
UCC381-5
150k
50k
UDG-98112
SLUS214B -JANUARY 2001
UCC281-3/-5/-ADJ
UCC381-3/-5/-ADJ
CONNECTION DIAGRAMS
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
SOIC-8 (Top View)
DP Package
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.
VOUT
1
8
VIN
GND
2
7
GND
GND
3
6
GND
VOUTS
4
5
CT*
* ADJ version only
DESCRIPTION (cont.)
Short circuit current is internally limited. The device responds to a sustained overcurrent condition by turning
off after a TON delay. The device then stays off for a period, TOFF, that is 32 times the TON delay. The device
then begins pulsing on and off at the TON /(TON+TOFF)
duty cycle of 3%. This drastically reduces the power dissipation during short circuit such that heat sinking, if at all
required, must only accommodate normal operation. On
the fixed output versions of the device TON is fixed at
400µs − a guaranteed minimum. On the adjustable version an external capacitor sets the on time. The off time
is always 32 times TON.
The UCC381 can be shutdown to 25µA (max) by pulling
the CT pin low.
Internal power dissipation is further controlled with thermal overload protection circuitry. Thermal shutdown occurs 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 industrial range of −40°C to +85°C, and the UCC381 series 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.
ELECTRICAL CHARACTERISTICS: Unless otherwise stated, these specifications hold for TA = 0°C to 70°C for the
UCC381-X series and −40°C to +85°C for the UCC283-X series, VIN = VOUT + 1.5V, IOUT = 0mA, COUT = 2.2µF. CT = 1500pF for
the UCC381-ADJ version and VOUT set to 5V. TJ = TA.
PARAMETER
TEST CONDITIONS
MIN
TYP
TJ = 25°C
4.925
5
Over Temperature
4.875
MAX UNITS
UCC381-5 Fixed 5V, 1A Family
Output Voltage
5.075
V
5.125
V
Line Regulation
VIN = 5.15V to 9V
1
3
mV
Load Regulation
IOUT = 0mA to 1A
2
5
mV
Drop Out Voltage, VIN – VOUT
Peak Current Limit
IOUT = 1A, VOUT = 4.85V, TA < 85°C
0.5
0.6
V
IOUT = 200mA, VOUT = 4.85V, TA < 85°C
100
200
mV
VOUT = 0V
2
Overcurrent Threshold
1
Current Limit Duty Cycle
VOUT = 0V
Overcurrent Time Out, TON
VOUT = 0V
400
Quiescent Current
Quiescent Current in Shutdown
VIN = 9V
Shutdown Threshold
At CT Input
Reverse Leakage Current
1V < VIN < VOUT, VOUT < 5.1V, at VOUT
UVLO Threshold
VIN where VOUT passes current
0.25
2
2.5
3.5
A
1.8
A
3
5
%
750
1600
µs
400
650
µA
10
25
µA
75
µA
3.0
V
0.65
2.8
V
UCC281-3/-5/-ADJ
UCC381-3/-5/-ADJ
ELECTRICAL CHARACTERISTICS: Unless otherwise stated, these specifications hold for TA = 0°C to 70°C for the
UCC381-X series and −40°C to +85°C for the UCC283-X series, VIN = VOUT + 1.5V, IOUT = 0mA, COUT = 2.2µF. CT = 1500pF for
the UCC381-ADJ version and VOUT set to 5V. TJ = TA.
PARAMETER
TEST CONDITIONS
MIN
TYP
TJ = 25°C
3.25
3.3
Over Temperature
3.22
MAX UNITS
UCC381-3 Fixed 3.3V, 1A Family
Output Voltage
3.35
V
3.38
V
Line Regulation
VIN = 3.45V to 9V
1
3
mV
Load Regulation
IOUT = 0mA to 1A
2
5
mV
Dropout Voltage, VIN - VOUT
Peak Current Limit
IOUT = 1A, VOUT = 3.15V, TA < 85°C
0.6
0.8
V
IOUT = 200mA, VOUT = 3.15V, TA < 85°C
100
200
mV
VOUT = 0V
2
Overcurrent Threshold
1
Current Limit Duty Cycle
VOUT = 0V
Overcurrent Time Out, TON
VOUT = 0V
400
Quiescent Current
3.5
A
1.8
A
3
5
%
750
1600
µs
400
650
µA
10
25
µA
75
µA
Quiescent Current in Shutdown
VIN = 9V
Shutdown Threshold
At CT Input
Reverse Leakage Current
1V < VIN < VOUT, VOUT < 3.35V, at VOUT
UVLO Threshold
VIN where VOUT passes current
2.5
2.8
3.0
V
TJ = 25°C
1.23
1.25
1.27
V
Over Temperature
1.22
1.28
V
0.25
0.65
V
UCC381-ADJ Adjustable Output, 1A Family
Regulating Voltage at ADJ Input
Line Regulation, at ADJ Input
VIN = VOUT + 150mV to 9V
1
3
mV
Load Regulation, at ADJ Input
IOUT = 0mA to 1A
2
5
mV
Dropout Voltage, VIN - VOUT
Peak Current Limit
IOUT = 1A, VOUT = 4.85V
0.5
0.6
V
IOUT = 200mA, VOUT = 4.85V
100
200
mV
VOUT = 0V
2
Overcurrent Threshold
Current Limit Duty Cycle
VOUT = 0V
Overcurrent Time Out, TON
VOUT = 0V, CT = 1500pF
400
Quiescent Current
Quiescent Current in Shutdown
VIN = 9V
Shutdown Threshold
At CT Input
Reverse Leakage Current
1V < VIN < VOUT, VOUT < 9V, at VOUT
0.25
Bias Current at ADJ Input
UVLO Threshold
3.5
A
1.8
A
3
5
%
1000
1600
µs
400
650
µA
10
25
µA
1
VIN where VOUT passes current
3
2.5
0.65
V
100
µA
100
250
nA
2.8
3.0
V
UCC281-3/-5/-ADJ
UCC381-3/-5/-ADJ
PIN DESCRIPTIONS
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.
CT: For UCC381-3 and UCC381-5 versions, this is the
shutdown pin which, when pulled low, turns off the regulator output and puts the device in a low current state.
For the UCC381-ADJ version, a capacitor is required between the CT pin and GND to set the TON time during
overcurrent according to the following (typical) equation:
VOUTS: Feedback for regulator sensing of the output
voltage. For loads which are a considerable resistive distance 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 version, the output voltage can be set by two external resitors according to the following relationship:
TON = 660 ,000 • CCT
GND: All voltages are measured with respect to this pin.
This is the low noise ground reference input for regulation. 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 capacitance if the source is located further than 1 inch from the
device.
R2 

VOUT = 1. 25 •  1 +

R1 

where R1 is a resistor connected between VOUT and
VOUTS and R2 is a resistor connected between VOUTS
and GND.
VOUT: Output for regulator. The regulator does not require a minimum output capacitor for stability. Choose
the appropriate size capacitor for the application with re-
TYPICAL APPLICATION CIRCUIT
CT
NOTE 2
SHUTDOWN
R2
NOTE 1
5
CT
VOUTS
VIN
8
R1
NOTE 1
UCC381
VIN
VOUT
1.0µF
4
GND
GND
GND
GND
7
6
3
2
1
OUTPUT
COUT
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: CT 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
UCC281-3/-5/-ADJ
UCC381-3/-5/-ADJ
APPLICATION INFORMATION
Overview
The UCC381 family of low dropout linear (LDO) regulators provide a regulated output voltage for applications
with up to 1A of load current. The regulator features a
low dropout voltage and short circuit protection, making
their use ideal for demanding high current applications
requiring fault tolerance.
A capacitive load on the regulator’s output will appear as a
short circuit during start-up. If the capacitance is too large,
the output voltage will not come into regulation during the
initial TON period and the UCC381 will enter pulsed mode
operation. The peak current limit, TON period, and load
characteristics determine the maximum value of output capacitor that can be charged. For a constant current load
the maximum output capacitance is given as follows:
Short Circuit Protection
The UCC381 provides unique short circuit protection
circuitry that reduces power dissipation during a fault.
When an overload situation is detected, the device enters a pulsed mode of operation at 3% duty cycle reducing the heat sink requirements during a fault. The
UCC381 has two current thresholds that determine its
behavior during a fault as shown in Fig. 1.
When the regulator current exceeds the Overcurrent
Threshold for a period longer than the TON, the
UCC381 shuts off for a period (TOFF) which is 32 times
TON. If the short circuit current exceeds the Peak Current Limit, the regulator limits the current to peak current limit during the TON period. The peak current limit
is nominally 1 Amp greater than the overcurrent threshold. The regulator will continue in pulsed mode until the
fault is cleared as illustrated in Fig. 1.
COUT (max ) = (ICL − I LOAD ) •
TON
Farads
VOUT
(1)
For worst case calculations the minimum values of on time
(TON) and peak current limit (ICL) should be used. The adjustable version allows the TON time to be adjusted with a
capacitor on the CT pin:
TON (adj ) (µ sec) = 660 , 000 • C (µ Farads )
(2)
For a resistive load (RLOAD) the maximum output capacitor
can be estimated from:
COUT (max ) =
(3)
TON
R LOAD



1
• ln 
VOUT

1− 
I •R

 CL
LOAD






 


Farads
OVERLOAD
OUTPUT
CURRENT
PEAK CURRENT
LIMIT
IO (nom)
OVERCURRENT
THRESHOLD
VO
(nom)
ROL ICL
OUTPUT
VOLTAGE
TON
32T ON
TON
32T ON
Figure 1. UCC381 short circuit timing.
5
TON
32T ON
UDG-98150
UCC281-3/-5/-ADJ
UCC381-3/-5/-ADJ
APPLICATION INFORMATION (cont.)
Dropout Performance
Referring to the Block Diagram, the dropout voltage of
the UCC381 is equal to the minimum voltage drop (VIN to
VOUT) across the N-Channel MOSFET. The dropout voltage is dependent on operating conditions such as load
current, input and load voltages, as well as temperature.
The UCC381 achieves a low Rds(ON) through the use of
an internal charge-pump (VPUMP) that drives the MOSFET gate. Fig. 2 depicts typical dropout voltages versus
load current for the 3.3V and 5V versions of the part, as
well as the adjustable version programmed to 3.0V.
VOUT -VIN (V)
Vout = 3V
Fig. 3 depicts the typical dropout performance of the adjustable version with various output voltages and load
currents.
0.2
Operating temperatures effect the RDS(ON) and dropout
voltage of the UCC381. Fig. 4 graphs the typical dropout
for the 3.3V and 5V versions with a 3A load over temperature.
0.4
0.6
IOUT(A)
DROP (3V)
Referring to the Typical Application Circuit, the output
voltage for the adjustable version is externally programmed through a resistive divider at the VOUTS pin as
shown.
0.7
VIN-VOUT (V)
0.8
VOUT
Vout = 5V
0.8
1
Figure 2. Typical dropout vs. load current.
Voltage Programming
R2 

= 1. 25 •  1 +
 Volts
R1 

Vout = 3.3V
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
(4)
DROP (5V)
0.6
0.5
For the fixed Voltage versions the resistive divider is internally set, and the VOUTS pin should be connected to
the VOUT pin. The maximum programmed output voltage for the adjustable part is constrained by the 9V absolute rating of the IC (including the charge pump
voltage) and its ability to enhance the N-Channel MOSFET. Unless the load current is well below the 1A rating
of the device, output voltages above 7V are not recommended. The minimum output voltage can be programmed down to 1.25V, however, the input voltage
must always be greater than the UVLO of the part.
0.4
-40
-20
0
20
40
TEMPERATURE (°C)
60
80
Figure 4. Typical dropout vs. temperature (1A load).
Iout = 0.2A
Iout = 0.5A
Iout = 1.0A
0.7
0.6
Shutdown Feature
0.5
VIN-VOUT (V)
All versions include a shutdown feature, limiting quiescent current to 25µA typical. The UCC381 is shut down
by pulling the CT pin to below 0.25V. As shown in the
applications circuit, a small logic level MOSFET or BJT
transistor connected to the CT pin can be driven with a
digital signal, putting the device in shutdown. If the CT
pin is not pulled low, the IC will internally pull up on the
pin, enabling the regulator. The CT pin should not be
forced high, as this will interfere with the short circuit protection feature. Selection of the timing capacitor for the
adjustable version is explained in the Short Circuit Protection section.
0.4
0.3
0.2
0.1
0
3
3.5
4
4.5
5
VOUT (V)
Figure 3. Typical dropout voltate vs. IOUT and VOUT.
6
UCC281-3/-5/-ADJ
UCC381-3/-5/-ADJ
APPLICATION INFORMATION (cont.)
mal resistance is required by the application, the device
heat sinking would need to be improved.
Thermal Design
The Packing Information section of the data book contains reference material for the thermal ratings of various
packages. The section also includes an excellent article
Thermal Characteristics of Surface Mount Packages, that
is the basis of the following discussion.
When the UCC381 regulator is in pulsed mode, due to
an overload or short circuit in the application, the maximum average power dissipation is calculated as follows:
PPULSE (avg ) =
Thermal design for the UCC381 includes two modes of
operation, normal and pulsed mode. In normal operation,
the linear regulator and heat sink must dissipate power
equal to the maximum forward voltage drop multiplied by
the maximum load current. Assuming a constant current
load, the expected heat rise at the regulator’s junction
can be calculated as follows:
T RISE = PDISS • (θ jc + θ ca) ° C
(V IN
(6)
 TON
− VOUT ) • ICL • 
 33 • TON

 Watts

As seen in equation 6, the average power during a fault
is reduced dramatically by the duty cycle, allowing the
heat sink to be sized for normal operation. Although the
peak power in the regulator during the TON period can be
significant, the thermal mass of the package will generally keep the junction temperature from rising unless the
TON period is increased to tens of milliseconds.
(5)
Where theta is thermal resistance and PDISS is the power
dissipated. The thermal resistance of both the SOIC-8
DP package (junction to case) is 22 degrees Celsius per
Watt. In order to prevent the regulator from going into
thermal shutdown, the case to ambient theta must keep
the junction temperature below 150C. If the LDO is
mounted on a 5 square inch pad of 1 ounce copper, for
example, the thermal resistance from junction to ambient
becomes 40-70 degrees Celsius per Watt. If a lower ther-
Ripple Rejection
Even though the UCC381 linear regulators are not optimized for fast transient applications (Refer to UC182
“Fast LDO Linear Regulator”), they do offer significant
power supply rejection at lower frequencies. Fig 5. depicts ripple rejection performance in a typical application.
The performance can be improved with additional filtering.
90
RIPPLE REJECTION (db)
80
70
60
50
10uF,
IOUT = 100mA
40
30
1uF, IOUT = 100mA
20
10uF, IOUT = 1A
10
0
1.0E+02
1uF, IOUT = 1A
1.0E+03
1.0E+04
FREQUENCY
Figure 5. Ripple rejection vs. frequency.
UNITRODE CORPORATION
7 CONTINENTAL BLVD. • MERRIMACK, NH 03054
TEL. (603) 424-2410 • FAX (603) 424-3460
7
1.0E+05
PACKAGE OPTION ADDENDUM
www.ti.com
4-Nov-2005
PACKAGING INFORMATION
Orderable Device
Status (1)
Package
Type
Package
Drawing
Pins Package Eco Plan (2)
Qty
UCC281DP-5
ACTIVE
SOIC
D
8
75
Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-2-260C-1 YEAR
UCC281DP-ADJ
ACTIVE
SOIC
D
8
75
Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-2-260C-1 YEAR
UCC281DPTR-5
ACTIVE
SOIC
D
8
2500 Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-2-260C-1 YEAR
UCC281DPTR-5G4
ACTIVE
SOIC
D
8
2500 Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-2-260C-1 YEAR
UCC281DPTR-ADJ
ACTIVE
SOIC
D
8
2500 Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-2-260C-1 YEAR
UCC281DPTR-ADJG4
ACTIVE
SOIC
D
8
2500 Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-2-260C-1 YEAR
UCC381DP-3
ACTIVE
SOIC
D
8
75
Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-2-260C-1 YEAR
UCC381DP-5
ACTIVE
SOIC
D
8
75
Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-2-260C-1 YEAR
UCC381DP-ADJ
ACTIVE
SOIC
D
8
75
Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-2-260C-1 YEAR
UCC381DP-ADJG4
ACTIVE
SOIC
D
8
75
Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-2-260C-1 YEAR
UCC381DPTR-3
ACTIVE
SOIC
D
8
2500 Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-2-260C-1 YEAR
UCC381DPTR-3G4
ACTIVE
SOIC
D
8
2500 Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-2-260C-1 YEAR
UCC381DPTR-5
ACTIVE
SOIC
D
8
2500 Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-2-260C-1 YEAR
UCC381DPTR-ADJ
ACTIVE
SOIC
D
8
2500 Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-2-260C-1 YEAR
UCC381DPTR-ADJG4
ACTIVE
SOIC
D
8
2500 Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-2-260C-1 YEAR
Lead/Ball Finish
MSL Peak Temp (3)
(1)
The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in
a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2)
Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS) or Green (RoHS & no Sb/Br) - please check
http://www.ti.com/productcontent for the latest availability information and additional product content details.
TBD: The Pb-Free/Green conversion plan has not been defined.
Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements
for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered
at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.
Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame
retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material)
(3)
MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder
temperature.
Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is
provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the
Addendum-Page 1
PACKAGE OPTION ADDENDUM
www.ti.com
4-Nov-2005
accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and continues to take
reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on
incoming materials and chemicals. TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited
information may not be available for release.
In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI
to Customer on an annual basis.
Addendum-Page 2
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