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SLUS215B − OCTOBER 1998 − REVISED FEBRUARY 2004

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

D Precision Positive Linear Series Pass

Voltage Regulation

D 0.45 V Dropout at 3 A

D 50 mV Dropout at 10 mA

D Quiescent Current Under 650 µA

Irrespective of Load

D Adjustable (5-Lead) Output Voltage Version

D Fixed (3-Lead) Versions for 3.3-V and 5-V

Outputs

D Logic Shutdown Capability

D Short-Circuit Power Limit of

(3% × V

× I

SHORT

)

D Low V

OUT

to V

Reverse Leakage

D Thermal Shutdown

description

The UCC283−3/−5/−ADJ family of positive linear

series pass voltage regulators are 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 UCC283−5 passes

3 A while requiring only 0.45 V of typical input

voltage headroom (ensured 0.6-V dropout).

These regulators include reverse voltage sensing that prevents current in the reverse direction. Quiescent

current is always less than 650 µA. These devices have been internally compensated in such a way that the

need for a minimum output capacitor has been eliminated.

UCC283−3 and UCC283−5 versions are in 3-lead packages and have preset outputs at 3.3 V and 5.0 V

respectively. The output voltage is regulated to 1.5% at room temperature. The UCC283−ADJ version, in a

5-lead package, regulates the output voltage programmed by an external resistor ratio.

Short-circuit current is internally limited. The device responds to a sustained overcurrent condition by turning

off after a t

time delay. The device then stays off for a period, t

OFF

, that is 32 times the t

delay. The device

then begins pulsing on and off at the t

/(t

OFF

) duty cycle of 3%. This drastically reduces the power

dissipation during short-circuit and means heat sinks need only accommodate normal operation. On the

3-leaded versions of the device t

is fixed at 750 µs, on the adjustable 5-leaded versions an external capacitor

sets the on time. The off time is always 32 × t

. The external timing control pin, CT, on the 5-leaded versions

also serves as a shutdown input when pulled low.

Internal power dissipation is further controlled with thermal overload protection circuitry. Thermal shutdown

occurs if the junction temperature exceeds 165°C. The chip remains off until the temperature has dropped 20°C.

The UCC283 series is specified for operation over the industrial range of −40°C to 85°C, and the UCC383 series

is specified from 0°C to 70°C. These devices are available in 3- and 5-pin TO−220 and TO−263 power packages.

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Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

VOUT

GND

VIN

ADJ

TO−263−5 TD PACKAGE

(FRONT VIEW)

TO−220−5 T PACKAGE

(FRONT VIEW)

VOUT

GND

VIN

ADJ

TO−220−3 T PACKAGE

(FRONT VIEW)

VOUT

GND2

VIN

TO−263−3 TD PACKAGE

(FRONT VIEW)

VOUT

GND

VIN

All trademarks are the property of their respective owners.

Summary of content (16 pages)

PAGE 1
SLUS215B − OCTOBER 1998 − REVISED FEBRUARY 2004 D Precision Positive Linear Series Pass D D D D D D D D D Voltage Regulation 0.45 V Dropout at 3 A 50 mV Dropout at 10 mA Quiescent Current Under 650 µA Irrespective of Load Adjustable (5-Lead) Output Voltage Version Fixed (3-Lead) Versions for 3.
PAGE 2
SLUS215B − OCTOBER 1998 − REVISED FEBRUARY 2004 AVAILABLE OPTIONS(1) TA OUTPUT VOLTAGE (V) MIN −40°C −40 C to 85 85°C C TYP MAX TO−220−5 TD T 3.22 3.3 3.58 UCC283TD−3 — UCC283T−3 4.875 5.00 5.125 UCC283TD−5 — UCC283T−5 — — UCC283TD−ADJ — UCC283T−ADJ — UCC383T−3 — ADJ 0°C 70°C 0 C to 70 C PACKAGE DEVICES TO−263−5(2) TO−220−3 TO−263−3(2) — 3.22 3.3 3.58 UCC383TD−3 4.875 5.
PAGE 3
SLUS215B − OCTOBER 1998 − REVISED FEBRUARY 2004 electrical characteristics TA = 0°C to 70°C for the UCC383−x series, TA = −40°C to 85°C for the UCC283−x, VVIN = VVOUT + 1.5 V, IOUT = 10 mA, CIN = 10 mF, COUT = 22 mF. For the UCC283−ADJ, VVIN = 6.5 V, VOUT = 5.
PAGE 4
SLUS215B − OCTOBER 1998 − REVISED FEBRUARY 2004 electrical characteristics TA = 0°C to 70°C for the UCC383−x series, TA = −40°C to 85°C for the UCC283−x, VVIN = VVOUT + 1.5 V, IOUT = 10 mA, CIN = 10 mF, COUT = 22 mF. For the UCC283−ADJ, VVIN = 6.5 V, VOUT = 5.
PAGE 5
SLUS215B − OCTOBER 1998 − REVISED FEBRUARY 2004 pin descriptions ADJ: Adjust pin for the UCC283−ADJ version only. Feedback pin for the linear regulator. Program the output voltage with R1 connected from ADJ to GND and R2 connected from VOUT to ADJ. Output voltage is given by: V OUT + 1.25 V (R1 ) R2) R1 CT: Short-circuit timing capacitor and shutdown input for the UCC283−ADJ version. Pulling CT below 0.
PAGE 6
SLUS215B − OCTOBER 1998 − REVISED FEBRUARY 2004 APPLICATION INFORMATION PEAK CURRENT LIMIT OUTPUT CURRENT OVERLOAD OVER− CURRENT THRESHOLD IO (NOM) VO (NOM) ROLICL OUTPUT VOLTAGE TON 32 TON TON 32 TON TON 32 TON Figure 1. UCC383 Short-Circuit Timing A capacitive load on the regulator’s output appears as a short-circuit during start-up.
PAGE 7
SLUS215B − OCTOBER 1998 − REVISED FEBRUARY 2004 APPLICATION INFORMATION dropout performance Referring to the Block Diagram, the dropout voltage of the UCC383 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.
PAGE 8
SLUS215B − OCTOBER 1998 − REVISED FEBRUARY 2004 APPLICATION INFORMATION voltage programming and shutdown feature for adjustable version A typical application circuit based on the UCC383 adjustable version is shown in Figure 5. The output voltage is externally programmed through a resistive divider at the ADJ pin. TYPICAL DROPOUT VOLTAGE vs. CASE TEMPERATURE WITH A 3-A LOAD VIN − VOUT (V) 0.6 0.5 V OUT = 3.
PAGE 9
SLUS215B − OCTOBER 1998 − REVISED FEBRUARY 2004 APPLICATION INFORMATION thermal design The Package Information section of the Power Supply Control Products Data Book, Volume 3 (Literature No. SLUD003) contains reference material for the thermal ratings of various packages.
PAGE 10
SLUS215B − OCTOBER 1998 − REVISED FEBRUARY 2004 APPLICATION INFORMATION UCC383−ADJ 1 VINPUT VIN VOUT 5 10µF 10µF RLOAD R2 2 CT SHUTDOWN ADJ GND 4 R1 3 Figure 5. Typical Application for 5-Pin Adjustable Version Figure 6. Ripple Rejection vs.
PAGE 11
PACKAGE OPTION ADDENDUM www.ti.
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MECHANICAL DATA MSOT008B – JANUARY 1995 – REVISED SEPTEMBER 2000 KC (R-PSFM-T5) PLASTIC FLANGE-MOUNT 0.113 (2,87) 0.103 (2,62) 0.420 (10,67) 0.380 (9,65) 0.156 (3,96) DIA 0.146 (3,71) 0.185 (4,70) 0.175 (4,46) 0.055 (1,40) 0.045 (1,14) 0.147 (3,73) 0.137 (3,48) 0.340 (8,64) 0.330 (8,38) 1.037 (26,34) 0.997 (25,32) 0.125 (3,18) (see Note C) 1 0.040 (1,02) 0.030 (0,76) 0.010 (0,25) M 5 0.067 (1,70) 0.268 (6,81) 0.122 (3,10) 0.102 (2,59) 0.025 (0,64) 0.012 (0,30) 4040208/E 09/00 NOTES: A. B. C.
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IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.