UC2833N [TI]
Precision Low Dropout Linear Controllers; 精密低压降线性控制器
| 型号： | UC2833N |
| 厂家： | 
TEXAS INSTRUMENTS |
| 描述： | Precision Low Dropout Linear Controllers |
| 文件： | 总20页 (文件大小：1451K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
UC1832
UC2832/3
UC3832/3
Precision Low Dropout Linear Controllers
FEATURES
DESCRIPTION
•
Precision 1% Reference
The UC2832 and UC3833 series of precision linear regulators include all the
control functions required in the design of very low dropout linear regulators.
Additionally, they feature an innovative duty-ratio current limiting technique
which provides peak load capability while limiting the average power dissipa-
tion of the external pass transistor during fault conditions. When the load cur-
rent reaches an accurately programmed threshold, a gated-astable timer is
enabled, which switches the regulator’s pass device off and on at an externally
programmable duty-ratio. During the on-time of the pass element, the output
current is limited to a value slightly higher than the trip threshold of the duty-ra-
tio timer. The constant-current-limit is programmable on the UCx832 to allow
higher peak current during the on-time of the pass device. With duty-ratio con-
trol, high initial load demands and short circuit protection may both be accom-
modated without extra heat sinking or foldback current limiting. Additionally, if
the timer pin is grounded, the duty-ratio timer is disabled, and the IC operates
in constant-voltage/constant-current regulating mode.
•
Over-Current Sense Threshold
Accurate to 5%
•
Programmable Duty-Ratio
Over-Current Protection
•
•
4.5 V to 36 V Operation
100mA Output Drive, Source, or
Sink
•
Under-Voltage Lockout
Additional Features of the UC2832
series:
•
Adjustable Current Limit to
Current Sense Ratio
These IC’s include a 2 Volt (±1%) reference, error amplifier, UVLO, and a high
current driver that has both source and sink outputs, allowing the use of either
NPN or PNP external pass transistors. Safe operation is assured by the inclu-
sion of under-voltage lockout (UVLO) and thermal shutdown.
•
•
Separate +VIN terminal
Programmable Driver Current
Limit
The UC3833 family includes the basic functions of this design in a low-cost, 8-
pin mini-dip package, while the UC2832 series provides added versatility with
the availability of 14 pins. Packaging options include plastic (N suffix), or ce-
ramic (J suffix). Specified operating temperature ranges are: commercial (0°C
to 70°C), order UC3832/3 (N or J); and industrial (–40°C to 85°C), order
UC2832/3 (N or J). Surface mount packaging is also available.
•
•
Access to VREF and E/A(+)
Logic-Level Disable Input
BLOCK DIAGRAMS
UDG-92040
SLUS387A - J UNE 1994 - REVISED - MAY 2003
UC1832
UC2832/3
UC3832/3
ABSOLUTE MAXIMUM RATINGS
Supply Voltage +VIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40V
Driver Output Current (Sink or Source) . . . . . . . . . . . . . 450mA
Driver Sink to Source Voltage . . . . . . . . . . . . . . . . . . . . . . . 40V
TRC Pin Voltage. . . . . . . . . . . . . . . . . . . . . . . . . . –0.3V to 3.2V
Other Input Voltages. . . . . . . . . . . . . . . . . . . . . . . –0.3V to +VIN
Operating Junction Temperature (note 2) . . . –55°C to +150°C
Storage Temperature . . . . . . . . . . . . . . . . . . . –65°C to +150°C
Lead Temperature (Soldering, 10 Seconds) . . . . . . . . . . 300°C
Note 1: Unless otherwise indicated, voltages are referenced to
ground and currents are positive into, negative out of, the speci-
fied terminals.
Note 2: See Unitrode Integrated Circuits databook for
information regarding thermal specifications and limitations of
packages.
CONNECTION DIAGRAMS
UC2832
UC3833
DIL-14 (Top View)
J Or N Package
DIL-8 (Top View)
J Or N Package
SOIC-16 (Top View)
DW Package
SOIC-16 (Top View)
DW Package
PACKAGE PIN FUNCTION
PACKAGE PIN FUNCTION
LCC-20 & PLCC-20
L & Q Package
(Top View)
LCC-20 & PLCC-20
L & Q Package
(Top View)
FUNCTION
PIN
FUNCTION
PIN
N/C
1
+VIN & C/S(+)
1
+VIN
2
N/C
2
Comp/Shutdown
E/A(+)
3
4
N/C
3
N/C
4
+2V REF
N/C
5
6
Comp/Shutdown
5
Gnd
6
Gnd
7
N/C
7
Logic Disable
Limit
8
9
N/C
8
N/C
9
Source
N/C
E/A(-)
Sink
VADJ
N/C
Timer RC
Current Sense(-)
Current Sense(+)
10
11
12
13
14
15-17
18
19
20
Source
N/C
E/A(-)
N/C
N/C
Sink
Timer RC
Current Sense(+)
N/C
10
11
12
13
14
15
16
17
18-20
2
UC1832
UC2832/3
UC3832/3
Unless otherwise stated, specifications hold for
TA = 0°C to 70°C for the UC3832/3, –40°C to 85°C
ELECTRICAL CHARACTERISTICS:
for the UC2832/3, +VIN = 15V, Driver sink = +VIN, C/S(+) voltage = +VIN. TA=TJ.
PARAMETER
Input Supply
TEST CONDITIONS
MIN
TYP
MAX UNITS
Supply Current
+VIN = 6 V
+VIN = 36 V
6.5
9.5
3.3
10
15
mA
mA
mA
Logic Disable = 2 V (UCx832 only)
Reference Section
Output Voltage (Note 3)
TJ = 25°C, IDRIVER = 10 mA
over temperature, IDRIVER = 10 mA
IO = 0 to 10 m
1.98
1.96
-10
2.00 2.02
V
V
2.00
-5.0
2.04
Load Regulation (UCx832 only)
Line Regulation
mV
mV/V
V
+VIN = 4.5 V to 36 V, IDRIVER = 10 m
0.033 0.5
Under-Voltage Lockout Threshold
Logic Disable Input (UCx832 only)
Threshold Voltage
3.6
4.5
1.3
1.4
1.5
V
Input Bias Current
Logic Disable = 0 V
Over Temperature
-5.0
-1.0
µA
Current Sense Section
Comparator Offset
95
93
100
100
135
135
235
305
100
105
107
170
170
290
360
135
10
mV
mV
mV
mV
mV
mV
µA
Amplifier Offset (UCx833 only)
Amplifier Offset (UCx832 only)
110
110
180
250
65
VADJ = Open
VADJ = 1 V
VADJ = 0 V
VCM = +VIN
Input Bias Current
Input Offset Current (UCx832 only) VCM = +VIN
-10
µA
Amplifier CMRR (UCx832 only)
Transconductance
VCM = 4.1 V to + VIN + 0.3
80
65
dB
±
ICOMP = 100 µA
mS
µA
VADJ Input Current (UCx832 only)
VADJ = 0V
-10
-1
Timer
Inactive Leakage Current
Active Pullup Current
Duty Ratio (note 4)
C/S(+) = C/S(-) = +VIN; TRC pin = 2 V
C/S(+) = +VIN, C/S(-) = +VIN - 0.4V; TRC pin = 0 V
ontime/period, RT = 200k, CT = 0.27µF
ontime + offtime, RT = 200k, CT = 0.27µF
0.25
-270
4.8
1.0
µA
µA
%
-345
-175
Period (notes 4,5)
36
ms
V
Upper Trip Threshold (Vu)
Lower Trip Threshold (Vl)
Trip Threshold Ratio
Error Amplifier
1.8
0.9
V
Vu/Vl
2.0
V/V
Input Offset Voltage (UCx832 only) VCM = VCOMP = 2 V
Input Bias Current VCM = VCOMP = 2 V
Input Offset Current (UCx832 only) VCM = VCOMP = 2 V
-8.0
-4.5
-1.5
50
8.0
1.5
mV
µA
µA
dB
dB
dB
mS
V
-1.1
AVOL
VCOMP = 1 V to 13 V
70
80
CMRR (UCx832 only)
PSRR (UCx832 only)
Transconductance
VOH
VCM = 0V to +VIN - 3 V
VCM = 2 V, +VIN = 4.5 V to 36
60
90
±
ICOMP = 10 µA
4.3
ICOMP = 0, Volts below +VIN
ICOMP = 0
.95
.45
-500
1.3
VOL
0.7
V
IOH
VCOMP = 2 V
-700
-100
µA
3
UC1832
UC2832/3
UC3832/3
ELECTRICAL
CHARACTERISTICS (cont.)
Unless otherwise stated, specifications hold for TA = 0°C to 70°C for the UC3832/3, –40°C to
85°C for the UC2832/3, +VIN = 15 V, Driver sink = +VIN, C/S(+) voltage = +VIN. TA=TJ.
PARAMETER
Error Amplifier (cont.)
IOL
TEST CONDITIONS
MIN
TYP
MAX UNITS
VCOMP = 2 V, C/S(-) = +VIN
100
2
500
6
700
µA
VCOMP = 2 V, C/S(-) = +VIN - 0.4 V
mA
Driver
Maximum Current
Driver Limit & Source pins common; TJ = 25°C
Over Temperature
200
100
300
300
400
450
mA
mA
Limiting Voltage (UCx832 only)
Driver Limit to Source voltage at current limit,
ISOURCE = -10 mA; TJ = 25°C (Note 6)
TJ = 25°C (Note 6)
.72
2.4
V
Ω
Internal Current Sense Resistance
Pull-Up Current at Driver Sink
Compensation/Shutdown = 0.4 V; Driver Sink = +VIN - 1V -800
Compensation/Shutdown = 0.4 V, +VIN = 36 V; Driver
-300
-100
µA
Sink = 35 V
Pull-Down Current at Driver Source Compensation/Shutdown = 0.4 V; Driver Source = 1 V
-1000 -300
-75
µA
µA
V
150
300
1.5
700
Saturation Voltage Sink to Source
Maximum Source Voltage
Driver Source = 0 V; Driver Current = 100 mA
Driver Sink = +VIN, Driver Current = 100 mA
Volts below + VIN
3.0
25
V
UVLO Sink Leakage
+VIN = C/S(+) = C/S(-) = 2.5 V, Driver Sink = 15 V, Driver
Source = 0 V, TA = 25°C
µA
Maximum Reverse Source Voltage Compensation/Shutdown = 0 V; ISOURCE = 100 µA,
+VIN = 3 V
1.6
V
Thermal Shutdown
160
°C
Note 3: On the UCx833 this voltage is defined as the regulating level at the error amplifier inverting input, with the error amplifier
driving VSOURCE to 2 V.
Note 4: These parameters are first-order supply-independent, however both may vary with supply for +VIN less than about 4 V. This
supply variation will cause a slight change in the timer period and duty cycle, although a high off-time/on-time ratio will be main-
tained.
±
Note 5: With recommended RT value of 200k, TOFF ≈ RT CT * ln(Vu/Vl) 10%.
Note 6: The internal current limiting voltage has a temperature dependence of approximately -2.0 mV/°C, or -2800 ppm/°C. The inter-
nal 2.4 Ω sense resistor has a temperature dependance of approximately +1500 ppm/°C.
APPLICATION AND OPERATION INFORMATION
NPN Pass (Local 100mA Regulator) (UCx833)
UDG-92041-1
4
UC1832
UC2832/3
UC3832/3
APPLICATION AND OPERATION INFORMATION (cont.)
PNP Pass (Low Drop-Out Regulator) (UCx833)
UDG-92042-1
NPN Pass (Medium Power, Low Drop-Out Regulator) (UCx832)
UDG-92043-1
Estimating Maximum Load Capacitance
For any power supply, the rate at which the total output
capacitance can be charged depends on the maximum
output current available and on the nature of the load. For
a constant-current current-limited power supply, the out-
put will come up if the load asks for less than the maxi-
mum available short-circuit limit current.
Current Sense Amplifier OffsetVoltage
and
K =
100mA
≈1.35 for UCx833, and is variable from 1.35 to 3.05
with VADJ for the UCx832.
For a worst-case constant-current load of value just less
than ITH, CMAX can be estimated from:
To guarantee recovery of a duty-ratio current-limited
power supply from a short-circuited load condition, there
is a maximum total output capacitance which can be
charged for a given unit ON time. The design value of ON
time can be adjusted by changing the timing capacitor.
Nominally, TON = 0.693 x 10k x CT.
TON
VOUT
CMAX = ((K−1)ITH) (
),
where VOUT is the nominal regulator output voltage.
For a resistive load of value RL, the value of CMAX can be
estimated from:
TON
RL
1
VOUT
K • ITH • RL
CMAX =
•
.
Typically, the IC regulates output current to a maximum of
IMAX = K x ITH, where ITH is the timer trip-point current,
−1
In [(1−
)
]
5
UC1832
UC2832/3
UC3832/3
APPLICATION AND OPERATION INFORMATION (cont.)
Current Sense Amplifier Offset Voltage vs VADJ
UCx832/33 Timer Function
UCx832/33 Current Sense Input Configuration
Load current, timing capacitor voltage, and output voltage of
the regulator under fault conditions.
6
UC1832
UC2832/3
UC3832/3
APPLICATION AND OPERATION INFORMATION (cont.)
UNITRODE CORPORATION
7 CONTINENTAL BLVD. • MERRIMACK, NH 03054
TEL. (603) 424-2410 • FAX (603) 424-3460
7
PACKAGE OPTION ADDENDUM
www.ti.com
28-Aug-2012
PACKAGING INFORMATION
Status (1)
Eco Plan (2)
MSL Peak Temp (3)
Samples
Orderable Device
Package Type Package
Drawing
Pins
Package Qty
Lead/
Ball Finish
(Requires Login)
5962-9326501M2A
5962-9326501MCA
5962-9326501V2A
5962-9326501VCA
UC1832J
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
LCCC
CDIP
LCCC
CDIP
CDIP
CDIP
LCCC
SOIC
FK
J
20
14
20
14
14
14
20
16
1
1
TBD
TBD
TBD
TBD
TBD
TBD
TBD
Call TI
Call TI
Call TI
Call TI
FK
J
1
POST-PLATE N / A for Pkg Type
1
A42
A42
A42
N / A for Pkg Type
N / A for Pkg Type
N / A for Pkg Type
J
1
UC1832J883B
UC1832L883B
UC2832DW
J
1
FK
DW
1
POST-PLATE N / A for Pkg Type
CU NIPDAU Level-2-260C-1 YEAR
40
Green (RoHS
& no Sb/Br)
UC2832DWG4
UC2832DWTR
UC2832DWTRG4
UC2833DW
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
SOIC
SOIC
SOIC
SOIC
SOIC
SOIC
SOIC
DW
DW
DW
DW
DW
DW
DW
16
16
16
16
16
16
16
40
2000
2000
40
Green (RoHS
& no Sb/Br)
CU NIPDAU Level-2-260C-1 YEAR
CU NIPDAU Level-2-260C-1 YEAR
CU NIPDAU Level-2-260C-1 YEAR
CU NIPDAU Level-2-260C-1 YEAR
CU NIPDAU Level-2-260C-1 YEAR
CU NIPDAU Level-2-260C-1 YEAR
CU NIPDAU Level-2-260C-1 YEAR
Green (RoHS
& no Sb/Br)
Green (RoHS
& no Sb/Br)
Green (RoHS
& no Sb/Br)
UC2833DWG4
UC2833DWTR
UC2833DWTRG4
40
Green (RoHS
& no Sb/Br)
2000
2000
Green (RoHS
& no Sb/Br)
Green (RoHS
& no Sb/Br)
UC2833J
UC2833N
OBSOLETE
ACTIVE
CDIP
PDIP
JG
P
8
8
TBD
Call TI
Call TI
50
50
40
40
Green (RoHS
& no Sb/Br)
CU NIPDAU N / A for Pkg Type
CU NIPDAU N / A for Pkg Type
CU NIPDAU Level-2-260C-1 YEAR
CU NIPDAU Level-2-260C-1 YEAR
UC2833NG4
UC3832DW
ACTIVE
ACTIVE
ACTIVE
PDIP
SOIC
SOIC
P
8
Green (RoHS
& no Sb/Br)
DW
DW
16
16
Green (RoHS
& no Sb/Br)
UC3832DWG4
Green (RoHS
& no Sb/Br)
Addendum-Page 1
PACKAGE OPTION ADDENDUM
www.ti.com
28-Aug-2012
Status (1)
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
Eco Plan (2)
MSL Peak Temp (3)
Samples
Orderable Device
Package Type Package
Drawing
Pins
Package Qty
Lead/
Ball Finish
(Requires Login)
UC3832DWTR
UC3832DWTRG4
UC3832N
SOIC
SOIC
PDIP
PDIP
SOIC
SOIC
SOIC
SOIC
DW
DW
N
16
16
14
14
16
16
16
16
2000
2000
25
Green (RoHS
& no Sb/Br)
CU NIPDAU Level-2-260C-1 YEAR
Green (RoHS
& no Sb/Br)
CU NIPDAU Level-2-260C-1 YEAR
CU NIPDAU N / A for Pkg Type
CU NIPDAU N / A for Pkg Type
CU NIPDAU Level-2-260C-1 YEAR
CU NIPDAU Level-2-260C-1 YEAR
CU NIPDAU Level-2-260C-1 YEAR
CU NIPDAU Level-2-260C-1 YEAR
Green (RoHS
& no Sb/Br)
UC3832NG4
N
25
Green (RoHS
& no Sb/Br)
UC3833DW
DW
DW
DW
DW
40
Green (RoHS
& no Sb/Br)
UC3833DWG4
UC3833DWTR
UC3833DWTRG4
40
Green (RoHS
& no Sb/Br)
2000
2000
Green (RoHS
& no Sb/Br)
Green (RoHS
& no Sb/Br)
UC3833J
UC3833N
OBSOLETE
ACTIVE
CDIP
PDIP
JG
P
8
8
TBD
Call TI
Call TI
50
50
Green (RoHS
& no Sb/Br)
CU NIPDAU N / A for Pkg Type
UC3833NG4
ACTIVE
PDIP
P
8
Green (RoHS
& no Sb/Br)
CU NIPDAU N / A for Pkg Type
(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), Pb-Free (RoHS Exempt), 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.
Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used between
the die and leadframe. The component is otherwise considered Pb-Free (RoHS compatible) as defined above.
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)
Addendum-Page 2
PACKAGE OPTION ADDENDUM
www.ti.com
28-Aug-2012
(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 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.
OTHER QUALIFIED VERSIONS OF UC1832, UC1832-SP, UC2832, UC3832, UC3833 :
Catalog: UC3832, UC1832
•
Enhanced Product: UC2832-EP
•
Military: UC1832, UC1833
•
Space: UC1832-SP
•
NOTE: Qualified Version Definitions:
Catalog - TI's standard catalog product
•
Enhanced Product - Supports Defense, Aerospace and Medical Applications
•
Military - QML certified for Military and Defense Applications
•
Space - Radiation tolerant, ceramic packaging and qualified for use in Space-based application
•
Addendum-Page 3
PACKAGE MATERIALS INFORMATION
www.ti.com
14-Jul-2012
TAPE AND REEL INFORMATION
*All dimensions are nominal
Device
Package Package Pins
Type Drawing
SPQ
Reel
Reel
A0
B0
K0
P1
W
Pin1
Diameter Width (mm) (mm) (mm) (mm) (mm) Quadrant
(mm) W1 (mm)
UC2832DWTR
UC2833DWTR
UC3832DWTR
UC3833DWTR
SOIC
SOIC
SOIC
SOIC
DW
DW
DW
DW
16
16
16
16
2000
2000
2000
2000
330.0
330.0
330.0
330.0
16.4
16.4
16.4
16.4
10.75 10.7
10.75 10.7
10.75 10.7
10.75 10.7
2.7
2.7
2.7
2.7
12.0
12.0
12.0
12.0
16.0
16.0
16.0
16.0
Q1
Q1
Q1
Q1
Pack Materials-Page 1
PACKAGE MATERIALS INFORMATION
www.ti.com
14-Jul-2012
*All dimensions are nominal
Device
Package Type Package Drawing Pins
SPQ
Length (mm) Width (mm) Height (mm)
UC2832DWTR
UC2833DWTR
UC3832DWTR
UC3833DWTR
SOIC
SOIC
SOIC
SOIC
DW
DW
DW
DW
16
16
16
16
2000
2000
2000
2000
367.0
367.0
367.0
367.0
367.0
367.0
367.0
367.0
38.0
38.0
38.0
38.0
Pack Materials-Page 2
MECHANICAL DATA
MCER001A – JANUARY 1995 – REVISED JANUARY 1997
JG (R-GDIP-T8)
CERAMIC DUAL-IN-LINE
0.400 (10,16)
0.355 (9,00)
8
5
0.280 (7,11)
0.245 (6,22)
1
4
0.065 (1,65)
0.045 (1,14)
0.310 (7,87)
0.290 (7,37)
0.063 (1,60)
0.015 (0,38)
0.020 (0,51) MIN
0.200 (5,08) MAX
0.130 (3,30) MIN
Seating Plane
0.023 (0,58)
0.015 (0,38)
0°–15°
0.100 (2,54)
0.014 (0,36)
0.008 (0,20)
4040107/C 08/96
NOTES: A. All linear dimensions are in inches (millimeters).
B. This drawing is subject to change without notice.
C. This package can be hermetically sealed with a ceramic lid using glass frit.
D. Index point is provided on cap for terminal identification.
E. Falls within MIL STD 1835 GDIP1-T8
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
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