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TC7800A Series
Three-Terminal Positive Voltage Regulators
FEATURES
s s s s s s s s Output Current in Excess of 1.0A No External Components Required Internal Thermal Overload Protection Internal Short Circuit Current Limiting Output Transistor Safe-Area Compensation Output Voltage Offered in 2% Tolerance Available in Surface Mount DDPAK and Standard 3-Lead Transistor Packages Previous Commercial Temperature Range has been Extended to a Junction Temperature Range of -40C to +125C
GENERAL DESCRIPTION
These voltage regulators are monolithic integrated circuits designed as fixed-voltage regulators for a wide variety of applications including local, on-card regulation. These regulators employ internal current limiting, thermal shutdown, and safe-area compensation. With adequate heatsinking they can deliver output currents in excess of 1.0A. Although designed primarily as a fixed voltage regulator, these devices can be used with external components to obtain adjustable voltages and currents.
ORDERING INFORMATION
3-Pin TO-220B 3-Pin DDPAK-B
Part Number* TC7805A-5.0VBB TC7812A-12.0VBB TC7815A-15.0VBB TC7805A-5.0VRB TC7812A-12.0VRB TC7815A-15.0VRB TC7824A-24.0VRB Package 3-Pin TO-220B 3-Pin TO-220B 3-Pin TO-220B 3-Pin DDPAK-B 3-Pin DDPAK-B 3-Pin DDPAK-B 3-Pin DDPAK-B Temperature Range -40 to + 125C -40 to + 125C -40 to + 125C -40 to + 125C -40 to + 125C -40 to + 125C -40 to + 125C
TC78XXA TC78XXA 1 1 2 3 2 3
Note: Contact company about other voltage and package options.
INPUT
GND
INPUT
GND
OUTPUT
Heatsink surface connected to Pin 2.
Heatsink surface (shown as terminal 4 in case outline drawing) connected to Pin 2.
OUTPUT
STANDARD APPLICATION
Input CIN* 0.33F TC78XXA Output CO**
A common ground is required between the input and the output voltages. The input voltage must remain typically 2.0 V above the output voltage even during the low point on the input ripple voltage. XX, * These two digits of the type number indicate nominal voltage. CIN is required if regulator is located an appreciable distance from power supply filter. CO is not needed for stability; however, it does improve transient response. Values of less than 0.1F could cause instability.
**
(c) 2001 Microchip Technology Inc.
DS21470A
TC7800/TC7800A-1 5/30/00
Three-Terminal Positive Voltage Regulators
TC7800A Series
ABSOLUTE MAXIMUM RATINGS*
(TA = 25C, unless otherwise noted.) Input Voltage (5.0 - 18V) ................................................... VIN = 35VDC (24V) ............................................................ VIN = 40VDC Power Dissipation (TA = 25C) .. PD = Internally Limited W Case TO-220B Thermal Resistance, Junction-to-Ambient ............................... JA = 65C/W Junction-to-Case ................................. JC = 5.0C/W Power Dissipation (TA = 25C) ..... PD = Internally Limited W DDPAK-B Thermal Resistance, Junction-to-Ambient ......... JA = (See Figure 13) C/W Junction-to-Case .................................. JA = 5.0C/W Storage Junction Temperature Range ............ TSTG = -65C to +150C Operating Junction Temperature .................. TJ = +150C
*Note: ESD Data Available upon request.
ELECTRICAL CHARACTERISTICS: (VIN = 10V, IOUT = 1.0A, TJ = TLOW to THIGH [Note 1], unless otherwise noted.)
Symbol TC7805A
VOUT VOUT REGLINE Output Voltage Output Voltage Line Regulation TJ = 25C 5.0mA IOUT 0.1A, PD 15W 7.5VDC VIN 20VDC Note 2 7.5VDC VIN 25VDC, IOUT = 500mA 8.0VDC VIN 12VDC, IOUT = 1.0A 8.0VDC VIN 12VDC, IOUT = 1.0A,TJ = 25C 7.3VDC VIN 20VDC, IOUT = 1.0A,TJ = 25C Note 2 5.0mA IOUT 1.5A, TJ = 25C 5.0mA IOUT 1.0A 250mA IOUT 750mA 8.0VDC VIN 25VDC, IOUT = 500mA 7.5VDC VIN 20VDC, TJ = 25C 5.0mA IOUT 1.0A 8.0VDC VIN 18VDC, f = 120Hz, IOUT = 500mA IOUT = 1.0A, TJ = 25C TA = 25C 10Hz f 100kHz f = 1.0kHz TA = 25C VIN = 35VDC TJ = 25C 4.9 4.8 5.0 5.0 5.1 5.2 VDC VDC mV -- -- -- -- -- -- -- -- -- -- -- 68 -- -- -- -- -- -- 0.5 0.8 1.3 4.5 1.3 0.8 0.53 3.2 0.3 -- 0.08 83 2.0 10 0.9 0.2 2.2 -0.3 10 12 4.0 10 mV 25 25 15 6.0 0.8 0.8 0.5 -- -- -- -- -- - -
Parameter
Test Conditions
Min
Typ
Max
Units
REGLOAD
Load Regulation
IB IB
Quiescent Current Quiescent Current Change
mA mA
RR VIN - VOUT VN ROUT ISC IMAX TCVOUT
Ripple Rejection Dropout Voltage Output Noise Voltage Output Resistance Short Circuit Current Limit Peak Output Current Average Temperature Coefficientof Output Voltage
dB VDC V/VOUT m A A mV/C
NOTES: 1. TLOW = -40C for TC78XXA, THIGH = +125C for TC78XX 2. Load and line regulation are specified at constant junction temperature. Changes in VOUT due to heating effects must be taken into account separately. Pulse testing with low duty cycle is used.
TC7800/TC7800A-1 5/30/00
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(c) 2001 Microchip Technology Inc.
DS21470A
Three-Terminal Positive Voltage Regulators
TC7800A Series
ELECTRICAL CHARACTERISTICS: (VIN = 19V, IOUT = 1.0A, TJ = TLOW to THIGH [Note 1], unless otherwise noted.)
Symbol TC7812A
VOUT VOUT REGLINE Output Voltage Output Voltage Line Regulation TJ = 25C 5.0mA IOUT 0.1A, PD 15W 14.8VDC VIN 27VDC Note 2 14.8VDC VIN 30VDC, IOUT = 500mA 16VDC VIN 22VDC, IOUT = 1.0A 14.5VDC VIN 27VDC, TJ = 25C Note 2 5.0mA IOUT 1.5A, TJ = 25C 5.0mA IOUT 1.0A 15VDC VIN 30VDC, IOUT = 500mA 14.8VDC VIN 27VDC, TJ = 25C 5.0mA IOUT 1.0A, TJ = 25C 15VDC VIN 25VDC, f = 120Hz, IOUT = 500mA IOUT = 1.0A, TJ = 25C TA = 25C 10Hz f 100kHz f = 1.0kHz TA = 25C VIN = 35VDC TJ = 25C 11.75 11.5 12 12 12.25 12.5 VDC VDC mV -- -- -- -- -- -- -- -- -- 55 -- -- -- -- -- -- 3.8 2.2 6.0 -- -- 3.4 -- -- -- 60 2.0 10 1.1 0.2 2.2 -0.8 18 20 120 mV 25 25 6.0 0.8 0.8 0.5 -- -- -- -- -- - -
Parameter
Test Conditions
Min
Typ
Max
Units
REGLOAD
Load Regulation
IB IB
Quiescent Current Quiescent Current Change
mA mA
RR VIN - VOUT VN ROUT ISC IMAX TCVOUT
Ripple Rejection Dropout Voltage Output Noise Voltage Output Resistance Short Circuit Current Limit Peak Output Current Average Temperature Coefficient of Output Voltage
dB VDC V/VOUT m A A mV/C
NOTES: 1. TLOW = -40C for TC78XXA, THIGH = +125C for TC78XX 2. Load and line regulation are specified at constant junction temperature. Changes in VOUT due to heating effects must be taken into account separately. Pulse testing with low duty cycle is used.
(c) 2001 Microchip Technology Inc.
DS21470A
3
TC7800/TC7800A-1 5/30/00
Three-Terminal Positive Voltage Regulators
TC7800A Series
ELECTRICAL CHARACTERISTICS: (VIN = 23V, IOUT = 1.0A, TJ = TLOW to THIGH [Note 1], unless otherwise noted.)
Symbol TC7815A
VOUT VOUT REGLINE Output Voltage Output Voltage Line Regulation TJ = 25C 5.0mA IOUT 0.1A, PD 15W 17.9VDC VIN 30VDC Note 2 17.9VDC VIN 30VDC, IOUT = 500mA 20VDC VIN 26VDC 17.5VDC VIN 30VDC, IOUT = 1.0A, TJ = 25C Note 2 5.0mA IOUT 1.5A, TJ = 25C 5.0mA IOUT 1.0A 250mA IOUT 750mA 17.5VDC VIN 30VDC, IOUT = 500mA 17.5VDC VIN 30VDC, IOUT = 1.0A, TJ = 25C 5.0mA IOUT 1.0A 18.5VDC VIN 28.5VDC, f = 120Hz, IOUT = 500mA IOUT = 1.0A, TJ = 25C TA = 25C 10Hz f 10kHz f = 1.0kHz TA = 25C VIN = 35VDC TJ = 25C 14.7 14.4 15 15 15.3 15.6 VDC VDC mV -- -- -- -- -- -- -- -- -- -- 60 -- -- -- -- -- -- 8.5 3.0 7.0 1.8 1.5 1.2 3.5 -- -- -- 80 2.0 10 1.2 0.2 2.2 -1.0 20 22 20 mV 25 25 15 6.0 0.8 0.8 0.5 -- -- -- -- -- - -
Parameter
Test Conditions
Min
Typ
Max
Units
REGLOAD
Load Regulation
IB IB
Quiescent Current Quiescent Current Change
mA mA
RR VIN - VOUT VN ROUT ISC IMAX TCVOUT
Ripple Rejection Dropout Voltage Output Noise Voltage Output Resistance Short Circuit Current Limit Peak Output Current Average Temperature Coefficient of Output Voltage
dB VDC V/VOUT m A A mV/C
NOTES: 1. TLOW = -40C for TC78XXA, THIGH = +125C for TC78XX 2. Load and line regulation are specified at constant junction temperature. Changes in VOUT due to heating effects must be taken into account separately. Pulse testing with low duty cycle is used.
TC7800/TC7800A-1 5/30/00
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(c) 2001 Microchip Technology Inc.
DS21470A
Three-Terminal Positive Voltage Regulators
TC7800A Series
ELECTRICAL CHARACTERISTICS: (VIN = 33V, IOUT = 1.0A, TJ = TLOW to THIGH [Note 1], unless otherwise noted.)
Symbol TC7824A
VOUT VOUT REGLINE Output Voltage Output Voltage Line Regulation TJ = 25C 5.0mA IOUT 0.1A, PD 15W 27.3VDC VIN 38VDC Note 2 27VDC VIN 38VDC, IOUT = 500mA 30VDC VIN 36VDC, IOUT = 1.0A 30VDC VIN 36VDC, TJ = 25C 26.7VDC VIN 38VDC, IOUT = 1.0A, TJ = 25C Note 2 5.0mA IOUT 1.5A, TJ = 25C 5.0mA IOUT 1.0A 250mA IOUT 750mA 27.3VDC VIN 38VDC, IOUT = 500mA 27VDC VIN 38VDC, TJ = 25C 5.0mA IOUT 1.0A 28VDC VIN 38VDC, f = 120Hz, IOUT = 500mA IOUT = 1.0A, TJ = 25C TA = 25C 10Hz f 100kHz f = 1.0kHz TA = 25C VIN = 35VDC TJ = 25C 23.5 23.2 24 24 24.5 25.8 VDC VDC mV -- -- -- -- -- -- -- -- -- -- -- 45 -- -- -- -- -- -- 11.5 3.8 3.8 10 2.1 2.0 1.8 3.6 -- -- -- 54 2.0 10 1.4 0.2 2.2 -2.0 25 28 12 25 mV 15 25 15 6.0 0.8 0.8 0.5 -- -- -- -- -- - -
Parameter
Test Conditions
Min
Typ
Max
Units
REGLOAD
Load Regulation
IB IB
Quiescent Current Quiescent Current Change
mA mA
RR VIN - VOUT VN ROUT ISC IMAX TCVOUT
Ripple Rejection Dropout Voltage Output Noise Voltage Output Resistance Short Circuit Current Limit Peak Output Current Average Temperature Coefficient of Output Voltage
dB VDC V/VOUT m A A mV/C
NOTES: 1. TLOW = -40C for TC78XXA, THIGH = +125C for TC78XX 2. Load and line regulation are specified at constant junction temperature. Changes in VOUT due to heating effects must be taken into account separately. Pulse testing with low duty cycle is used.
(c) 2001 Microchip Technology Inc.
DS21470A
5
TC7800/TC7800A-1 5/30/00
Three-Terminal Positive Voltage Regulators
TC7800A Series
APPLICATIONS INFORMATION
Design Considerations The TC7800A Series of fixed voltage regulators are designed with Thermal Overload Protection that shuts down the circuit when subjected to an excessive power overload condition, Internal Short Circuit Protection that limits the maximum current the circuit will pass, and Output Transistor Safe-Area Compensation that reduces the output short circuit current as the voltage across the pass transistor is increased. In many low current applications, compensation capacitors are not required. However, it is recommended that the regulator input be bypassed with a capacitor if the regulator is connected to the power supply filter with long wire lengths, or if the output load capacitance is large. An input bypass capacitor should be selected to provide good high-frequency characteristics to insure stable operation under all load conditions. A 0.33F or larger tantalum, mylar, or other capacitor having low internal impedance at high frequencies should be chosen. The bypass capacitor should be mounted with the shortest possible leads directly across the regulators input terminals. Normally good construction techniques should be used to minimize ground loops and lead resistance drops since the regulator has no external sense lead.
Input 0.33F
TC7805A R Constant Current to Grounded Load
Input
Output TC7805A
7 0.33F 1.0k 6
IO
2 0.1F 3 10k
The TC7800A regulators can also be used as a current source when connected as above. In order to minimize dissipation the TC7805A is chosen in this application. Resistor R determines the current as follows: IOUT = 5.0V = IB R IB 3.2mA over line and load charges. For example, a 1.0A current source would require R to be a 5.0, 10W resistor and the output voltage compliance would be the input voltage less 7.0V. Figure 1. Current Regulator
4
TC901
VO = 7.0V to 20V VIN = VO 2.0V The addition of an operational amplifier allows adjustment to higher or intermediate values while retaining regulation characteristics. The minimum voltage obtainable with this arrangement is 2.0V greater than the regulator voltage. Figure 2. Adjustable Output Regulator
RSOURCE Input
MJ2955 or Equiv. 0.33F R TC78XXA Output
RSOURCE Input
RSC
MJ2955 or Equiv. 0.33F
2N6049 or Equiv. R TC78XXA Output 1.0F XX = 2 digits of type number indicating voltage.
The circuit of Figure 3 can be modified to provide supply protection against short circuits by adding a short circuit sense resistor, RSC, and an additional PNP transistor.The current sensing PNP must be able to handle the short circuit current of the three-terminal regulator. Therefore, a four- ampere plastic power transistor is specified. Figure 4. Short Circuit Protection 6
(c) 2001 Microchip Technology Inc. DS21470A
10F
1.0F
1.0F
10F
XX = 2 digits of type number indicating voltage.
The TC7800A series can be current boosted with a PNP transistor. The MJ2955 provides current to 5.0A. Resistor R in conjunction with the VBE of the PNP determines when the pass transistor begins conducting; this circuitis not short circuit proof. Input/output differential voltage minimum is increased by VBE of the pass transistor. Figure 3. Current Boost Regulator
TC7800/TC7800A-1 5/30/00
Three-Terminal Positive Voltage Regulators
TC7800A Series
TYPICAL CHARACTERISTICS
Figure 5. Peak Output Current as a Function of Input/Output Differential Voltage
3.0
IOUT, OUTPUT CURRENT (A)
Figure 6. Ripple Rejection as a Function of Output Voltages
80
RR, RIPPLE REJECTION (dB)
TJ = -40C 2.5 2.0 1.5 1.0 0.5 0 TJ = 85C TJ = 125C 8.0 10 12 15 20 25 30 35 40 TJ = 0C TJ = 25C
70 PART# VIN TC7805A = 10V TC7812A = 19V TC7815A = 23V TC7824A = 33V f = 120Hz IOUT = 20mA VIN = 1.0V(RMS)
60
50
4.0 6.0
40 4.0
6.0
8.0
10
12
14
16
18
20
22
24
VIN - VOUT, INPUT/OUTPUT VOLTAGE DIFFERENTIAL (V)
VOUT, OUTPUT VOLTAGE (V)
Figure 7. Ripple Rejection as a Function of Frequency
80
VOUT, OUTPUT VOLTAGE (V) RR, RIPPLE REJECTION (dB)
Figure 8. Output Voltage as a Function of Junction Temperature (TC7805A)
70 TC78XXA 60 50 40 30 0.01 VIN = 8.0V to 18V IOUT = 500mA f = 120Hz TA = 25C
5.0
VIN = 20V IOUT = 5.0mA
4.9
0.1
1.0
10
4.8 -60
-20
20
60
100
140
180
f, FREQUENCY (kHz)
TJ, JUNCTION TEMPERATURE (C)
Figure 9. Output Impedance as a Function of Output Voltage
ZOUT, OUTPUT IMPEDANCE (m) IB, QUIESCENT CURRENT (mA)
Figure 10. Quiescent Current as a Function of Temperature
6.0 4.0 3.0 2.0 1.0 0 -75 VIN = 10V VOUT = 5.0V IL = 20mA
10 5.0 3.0 2.0 1.0 0.5 0.3 0.2 0.1 4.0 8.0 12 16 20 24 f = 120Hz IO = 500mA TA = 25C CL = 0F
-50
-25
0
25
50
75
100
125
VOUT, OUTPUT VOLTAGE (V)
(c) 2001 Microchip Technology Inc. DS21470A
TJ, JUNCTION TEMPERATURE (C)
7
TC7800/TC7800A-1 5/30/00
Three-Terminal Positive Voltage Regulators
TC7800A Series
VIN - VOUT, INPUT-OUTPUT VOLTAGE DIFFERENTIAL (V)
Figure 11. Worst Case Power Dissipation versus Ambient Temperature (TO-220B) Figure 12. Input Output Differential as a Function of Junction Temperature
2.5 IOUT = 1.0A I = 500mA 2.0 OUT IOUT = 200mA 1.5 IOUT = 20mA 1.0 0.5 IOUT = 0mA
PD, POWER DISSIPATION (W)
20 16 12 8.0 4.0 0 -50 HS = 0C/W JC = 5C/W JA = 65C/W TJ(MAX) = 150C
HS = 5C/W HS = 15C/W
No Heatsink -25 0 25 50 75 100 125 150
VOUT = 2% of VOUT --- Extended Curve for TC78XXA -50 -25 0 25 50 75 100 125
0 -75
TA, AMBIENT TEMPERATURE (C)
TJ, JUNCTION TEMPERATURE (C)
PD, MAXIMUM POWER DISSIPATION (W)
8
Figure 13. DDPAK Thermal Resistance and Maximum Power Dissipation versus P.C.B. Copper Length
DEFINITIONS
Line Regulation - The change in output voltage for a change in the input voltage. The measurement is made under conditions of low dissipation or by using pulse techniques such that the average chip temperature is not significantly affected. Load Regulation - The change in output voltage for a change in the load current at constant chip temperature. Maximum Power Dissipation - The maximum total device dissipation for which the regulator will operate within specifications. Quiescent Current - That part of the input current that is not delivered to the load. Output Noise Voltage - The rms AC voltage at the output, with constant load and no input ripple, measured over a specified frequency range. Long Term Stability - Output voltage stability under accelerated life test conditions with the maximum rated voltage listed in the devices' electrical characteristics and maximum power dissipation.
JA, THERMAL RESISTANCE JUNCTION-TO-AIR (C/W)
80 70 60 50 Free Air Mounted Vertically PD(MAX) for TA = 50C 2.0 oz. Copper L Minimum Size Pad L
3.5 3.0 2.5 2.0 1.5 JA 0 5.0 10 15 20 25 1.0 30
40 30
L, LENGTH OF COPPER (mm)
TC7800/TC7800A-1 5/30/00
(c) 2001 Microchip Technology Inc.
DS21470A
Three-Terminal Positive Voltage Regulators
TC7800A Series
PACKAGE DIMENSIONS
3-Pin TO-220B
.190 (4.82) .160 (4.07) .120 (3.04) .100 (2.54) .405 (10.28) .380 (9.66) .147 (3.73) .142 (3.61)
.055 (1.39) .045 (1.15)
.255 (6.47) .235 (5.97) .620 (15.75) .570 (14.48)
.155 (3.93) .110 (2.80) .562 (14.27) .500 (12.70) .060 (1.52) .045 (1.15)
.025 (0.64) 018 (0 46)
3-Pin DDPAK-B
.403 (10.24) .386 (9.80) .180 (4.57) .170 (4.32)
.055 (1.40) .045 (1.14)
.368 (9.35) .356 (9.04) .579 (14.71) .539 (13.69) .125 (3.18) MAX. PIN 1 .100 (2.54) BSC
.050 (1.27) REF. .010 (0.25) .000 (0.00) .051 (1.30) REF. .036 (0.91) .026 (0.66) 5 REF. .026 (0.66) .018 (0.46) .078 (1.98) .058 (1.47)
(c) 2001 Microchip Technology Inc.
DS21470A
9
TC7800/TC7800A-1 5/30/00
Three-Terminal Positive Voltage Regulators
TC7800A Series
WORLDWIDE SALES AND SERVICE
AMERICAS
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01/09/01
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All rights reserved. (c) 2001 Microchip Technology Incorporated. Printed in the USA. 1/01
Information contained in this publication regarding device applications and the like is intended through suggestion only and may be superseded by updates. It is your responsibility to ensure that your application meets with your specifications. No representation or warranty is given and no liability is assumed by Microchip Technology Incorporated with respect to the accuracy or use of such information, or infringement of patents or other intellectual property rights arising from such use or otherwise. Use of Microchipis products as critical components in life support systems is not authorized except with express written approval by Microchip. No licenses are conveyed, implicitly or otherwise, except as maybe explicitly expressed herein, under any intellectual property rights. The Microchip logo and name are registered trademarks of Microchip Technology Inc. in the U.S.A. and other countries. All rights reserved. All other trademarks mentioned herein are the property of their respective companies.
TC7800/TC7800A-1 5/30/00
10
(c) 2001 Microchip Technology Inc.
DS21470A

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