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7A / 5A / 4.6A / 3A, FAST RESPONSE, LOW DROPOUT POSITIVE LINEAR VOLTAGE REGULATORS
PRELIMINARY INFORMATION
TCL1584 TCL1584 TCL1585 TCL1585 TCL1587 TCL1587
7A / 5A / 4.6A / 3A, FAST RESPONSE, LOW DROPOUT POSITIVE LINEAR VOLTAGE REGULATORS
FEATURES
s s s s s s s s Fixed and Adjustable Voltages ........ 1.5V and 3.3V Optimized for Low Voltage Applications Output Current Capability ..........7A / 5A / 4.6A / 3A Guaranteed Dropout Voltage up to Full Rated Output Integrated Thermal and Short-Circuit Protection Compact 3-Pin Surface-Mount and Thru-Hole Standard Power Packages VREF Accuracy ................................................. 2.0% Load Regulation ............................................. 0.05% The TCL1584/1585/1587 are low dropout, positive linear voltage regulators. They have a maximum current output specification of 7A, 5A, 4.6A and 3A respectively. All three devices are supplied in fixed and adjustable output voltage versions. Good transient load response combined with low dropout voltage makes these devices ideal for the latest low voltage microprocessor power supplies. Additionally, shortcircuit, thermal and safe operating area (SOA) protection is provided internally to ensure reliable operation. The TCL1587, TCL1585 and TCL1584 are available in a 3-pin TO-220 tabbed power package and in a 3-pin surface mount DDPAK-3 package.
APPLICATIONS
s s s s s PentiumTM*, PentiumProTM* CPU Power Supplies PowerPCTM* CPU Power Supplies PentiumProTM* System GTL+ Bus Terminators Low-Voltage, High Speed Microprocessors Post-Regulator for Switch-Mode Power Supplies
ORDERING INFORMATION
Part Number TCL1584-3.3CAB TCL1584-3.3CEB TCL1584-ADJCAB TCL1584-ADJCEB TCL1585-1.5CAB TCL1585-1.5CEB TCL1585-3.3CAB TCL1585-3.3CEB TCL1585-ADJCAB TCL1585-ADJCEB Package TO-220-3 DDPAK-3 TO-220-3 DDPAK-3 TO-220-3 DDPAK-3 TO-220-3 DDPAK-3 TO-220-3 DDPAK-3 TO-220-3 DDPAK-3 TO-220-3 DDPAK-3 TO-220-3 DDPAK-3 Temp. Range 0C to + 70C 0C to + 70C 0C to + 70C 0C to + 70C 0C to + 70C 0C to + 70C 0C to + 70C 0C to + 70C 0C to + 70C 0C to + 70C 0C to + 70C 0C to + 70C 0C to + 70C 0C to + 70C 0C to + 70C 0C to + 70C
GENERAL DESCRIPTION
PIN CONFIGURATIONS
TO-220-3 DDPAK-3
1
2
3
1
2
3
TCL1584CAB TCL1585CAB TCL1587CAB
ADJ/GND ADJ/GND VOUT VOUT VIN VIN
TCL1584CEB TCL1585CEB TCL1587CEB
NOTE: For TO-220 JA = 53C/W. For DDPAK-3 JA = 76C/W. JA for both packages are specified without external heat sinks. See Applications Section for details.
TCL1587-1.5CAB TCL1587-1.5CEB TCL1587-3.3CAB TCL1587-3.3CEB TCL1587-ADJCAB TCL1587-ADJCEB
TYPICAL OPERATING CIRCUIT
Fixed Output Voltage Version VIN = 5V C1 = 10F VIN VOUT TCL158x-3.3 GND VOUT = 3.3V C2* (Tantalum) VIN = 5V C1 = 10F Adjustable Output Voltage Version VIN TCL158x ADJ VOUT R1 VOUT = (1+ R1/R2)VREF C2* (Tantalum)
R2 *NOTE: C2 is required to ensure output stability. Minimum 22F (TCL1584) or 10F (TCL1585/7), low ESR tantalum type. Larger values may be required for high output current transient regulation. See Applications section.
TCL1584/1585/1587-04 6/6/97 TCL1584/1585/1587-04 6/6/97
*All Trademarks and Trade Names are the property of their respective owners.
1
TelCom Semiconductor reserves the right to make changes in the circuitry and specifications of its devices.
PRELIMINARY INFORMATION
TCL1584 TCL1585 TCL1587
ABSOLUTE MAXIMUM RATINGS*
Input Voltage (VIN to GND) ...........................................7V Operating Junction Temperature Range Control Circuitry ................................... 0C to +125C Output Transistor ................................. 0C to +150C Power Dissipation ..................... See Applications Section Storage Temperature (unbiased) .......... - 65C to +150C Lead Temperature (Soldering, 10 sec) ................. +300C
7A / 5A / 4.6A / 3A, FAST RESPONSE, LOW DROPOUT POSITIVE LINEAR VOLTAGE REGULATORS
*This is a stress rating only, and functional operation of the device at these or any other conditions beyond those indicated in the operation section of the specifications is not implied. Exposure to absolute maximum ratings conditions for extended periods of time may affect device reliability.
ELECTRICAL CHARACTERISTICS: TA = Operating Temperature Range, 4.75V VIN 5.25V, unless
otherwise specified. Parameter Device
Reference TCL1584 Voltage TCL1585
Test Conditions
Min
1.225
Typ
1.25
Max
1.275
Unit
V
1.5V (VIN - VOUT) 3V, 10mA IOUT 7A 1.5V (VIN - VOUT) 5.75V, 10mA IOUT 4.6A, TJ 25C 1.5V (VIN - VOUT) 5.75V, 10mA IOUT 4A, TJ < 25C TCL1587 1.5V (VIN - VOUT) 5.75V, 10mA IOUT 3A Output TCL1587-1.5 4.75V VIN 7V, 0mA IOUT 3A Voltage TCL1584-3.3 4.75V VIN 6.3V, 0mA IOUT 7A TCL1585-3.3 4.75V VIN 7V, 0mA IOUT 4.6A, TJ 25C 4.75V VIN 7V, 0mA IOUT 4A, TJ < 25C TCL1587-3.3 4.75V VIN 7V, 0mA IOUT 3A Line TCL1584/5/7 2.75V VIN 7V, IOUT = 10mA Regulation TCL1587-1.5 4.75V VIN 7V, IOUT = 0mA (Notes 1, 2) TCL1584/5/7-3.3 4.75V VIN 7V, IOUT = 0mA Load TCL1584/5/7 (VIN - VOUT) = 3V, TJ = 25C, 10mA IOUT IFULL LOAD Regulation TCL1587-1.5 VIN = 5V, TJ = 25C, 0mA IOUT IFULL LOAD (Notes 1, TCL1584/5/7-3.3 VIN = 5V, TJ = 25C, 0mA IOUT IFULL LOAD 2, 3) Over Operating Temperature Range Dropout TCL1585/7 VREF = 1%, IOUT = 3A Voltage TCL1587-1.5 VOUT = 1%, IOUT = 3A TCL1585/7-3.3 VOUT = 1%, IOUT = 3A TCL1585 VREF = 1%, IOUT = 4.6A, TJ 25C VREF = 1%, IOUT = 4A, TJ < 25C TCL1585-3.3 VOUT = 1%, IOUT = 4.6A, TJ 25C VOUT = 1%, IOUT = 4A, TJ < 25C TCL1584 VREF = 1%, IOUT = 6A TCL1584-3.3 VOUT = 1%, IOUT = 6A: TJ 25C TJ < 25C TCL1584 VREF = 1%, IOUT = 7A TCL1584-3.3 VOUT = 1%, IOUT = 7A Current TCL1584 (VIN - VOUT) = 3V 7.10 Limit TCL1584-3.3 (VIN - VOUT) = 3V (Note 3) TCL1585 (VIN - VOUT) = 5.5V: TJ < 25C TCL1585-3.3 (VIN - VOUT) = 5.5V: TJ 25C TCL1587 (VIN - VOUT) = 5.5V TCL1587-1.5 (VIN - VOUT) = 5.5V TCL1587-3.3 (VIN - VOUT) = 5.5V Temperature TBD TBD Coefficient ADJ Pin TCL1584/5/7 Current
TCL1584/1585/1587-04 6/6/97
3.235
3.30
3.365
V
--
0.005
0.2
%
--
0.05
0.3
%
-- --
0.05 1.15
0.5 1.30
V
--
1.20
1.40
V
-- -- -- 8.25 4.10 4.60 3.10
1.20 1.30 1.25 -- 5.25 5.25 3.75
1.30 1.35 1.40 A -- --
V V | A A
--
55
120
A
2
7A / 5A / 4.6A / 3A, FAST RESPONSE, LOW DROPOUT POSITIVE LINEAR VOLTAGE REGULATORS
PRELIMINARY INFORMATION
TCL1584 TCL1585 TCL1587
ELECTRICAL CHARACTERISTICS: (Cont.) TA = Operating Temperature Range, 4.75V VIN 5.25V,
unless otherwise specified. Parameter Device
ADJ Pin Current Change (Note 3) Minimum Load Current Quiescent Current Ripple Rejection TCL1584 TCL1585/7
Test Conditions
1.5V (VIN - VOUT) 3V, 10mA IOUT IFULL LOAD 1.5V (VIN - VOUT) 5.75V, 10mA IOUT IFULL LOAD
Min
--
Typ
0.2
Max
5
Unit
A
TCL1584/5/7
1.5V (VIN -VOUT) 5.75V
--
2
10
mA
VIN = 5V VIN = 5V f = 120Hz, COUT = 25F Tant. (VIN - VOUT) = 2.5V, IOUT = 7A f = 120Hz, COUT = 25F Tant., VIN = 5.8V, IOUT = 7A f = 120Hz, COUT = 25F Tant., (VIN - VOUT) = 3V, IOUT = 4.6A, TJ 25C f = 120Hz, COUT = 25F Tant., (VIN - VOUT) = 3V, IOUT = 4A, TJ 25C TCL1585-3.3 f = 120Hz, COUT = 25F Tant.,VIN = 6.3V, IOUT = 4.6A, TJ 25C f = 120Hz, COUT = 25F Tant.,VIN = 6.3V, IOUT = 4.6A, TJ 25C TCL1587 f = 120Hz, COUT = 25F Tant., (VIN - VOUT) = 3V, IOUT = 3A TCL1587-1.5 f = 120Hz, COUT = 25F Tant., VIN = 5.0V, IOUT = 3A TCL1587-3.3 f = 120Hz, COUT = 25F Tant., VIN = 6.3V, IOUT = 3A Thermal TCL1584/5/7 TA = 25C, 30msec Pulse Regulation TCL1587-1.5 TA = 25C, 30msec Pulse TCL1584/5/7-3.3 TA = 25C, 30msec Pulse Temperature VIN = 5V, IOUT = 0.5A Stability Long Term TA = 125C, 1000Hrs. Stability RMS TA = 25C, 10Hz f 10kHz Output Noise (% of VOUT) Thermal TCL1584 "A" pkg. (TO-220): Control Circuitry/Power Transistor Resistance TCL1585 "A" pkg. (TO-220): Control Circuitry/Power Transistor (Junction to TCL1585 "E" pkg. (TO-263): Control Circuitry/Power Transistor Case, JA) TCL1587 "A" pkg. (TO-220): Control Circuitry/Power Transistor TCL1587 "E" pkg. (TO-263): Control Circuitry/Power Transistor TCL1587-1.5 TCL1584/5/7-3.3 TCL1584 TCL1584-3.3 TCL1585
-- 60
8 72
13 --
mA dB
--
0.004
0.02
%/W
-- -- --
0.5 0.03 0.003
-- 1.0 --
% % %
-- -- -- -- --
-- -- -- -- --
0.65/2.7 0.7/3.0 0.7/3.0 0.7/3.0 0.7/3.0
C/W C/W C/W C/W C/W
NOTES: 1. See thermal regulation specifications for changes in output voltage due to heating effects. Load and line regulation are measured at a constant junction temperature by low duty cycle pulse testing. 2. Load and line regulation are guaranteed up to the maximum power dissipation (25W for the TCL1584 in "A" pkg., 26.5W for the TCL1585 in "A" pkg., 18W for the TCL1587 in "A" pkg.). Power dissipation is determined by input/output voltage differential and output current. Guaranteed maximum output current/power will not be available over full input/output voltage range. 3. IFULL LOAD is defined as the maximum value of output load current as a function of input-to-output voltage. IFULL LOAD is a nominal 7A for TCL1584, decreasing to approximately 3A as VIN - VOUT increases from 3V to 7V. For all other fixed voltage TCL1585's, IFULL LOAD is 4A. For the TCL1587, IFULL LOAD is 3A. The TCL1585 and 1587 have constant current limit with respect to VIN and VOUT.
TCL1584/1585/1587-04 6/6/97
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PRELIMINARY INFORMATION
TCL1584 TCL1585 TCL1587
7A / 5A / 4.6A / 3A, FAST RESPONSE, LOW DROPOUT POSITIVE LINEAR VOLTAGE REGULATORS
Typical Dropout Voltage vs. Output Current
1.5
INPUT/OUTPUT DIFFERENTIAL (V)
1.4 1.3 1.2 1.1 1.0 0.9 0.8 0.7 0.6 0.5 0 OUTPUT CURRENT (A) IFULL LOAD
SIMPLIFIED SCHEMATIC
VIN
+
TCL1584/5/7
-
VOUT THERMAL LIMIT
ADJ
GND FOR FIXED VOLTAGE DEVICE
TCL1584/1585/1587-04 6/6/97
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7A / 5A / 4.6A / 3A, FAST RESPONSE, LOW DROPOUT POSITIVE LINEAR VOLTAGE REGULATORS
PRELIMINARY INFORMATION
TCL1584 TCL1585 TCL1587
age response to step load current change is illustrated in Figure 1. The capacitor's ESR and ESL cause immediate step changes in the output voltage. These are calculated as follows: VESR = I x ESR DVESL = DI/Dt x ESL To reduce the initial voltage droop, one should select low ESR and ESL capacitors. It should also be noted that the ESR effect is multiplied by absolute change in load current while the ESL effect is multiplied by the rate of change in load current. After the initial voltage drop, the capacitor value dominates the rate of change in voltage. This rate is calculated as follows: V = t x I/C
APPLICATIONS General
The TCL158x family of devices combine high current output (up to 7A) with low dropout voltage and built-in fault protection in a traditional three-terminal LDO format. All three device types are available in fixed output voltage and adjustable output versions. Fault protection includes shortcircuit current limit, over-temperature limit, and safe-operating-area (SOA) governing. These devices are pin-compatible upgrades for the 1083/1084/1085 family of LDO's. However, the TCL158x family delivers lower dropout voltage, faster load transient response and improved internal frequency compensation. Maximum supply voltage rating is 7.0V. Modern processors cycle load current from near zero to several amps in a time period measured in tens of nanoseconds. Load step response requirements are worsened by tighter output voltage tolerances. The TCL1584/85/87 family of regulators meets these stringent requirements without an obnoxious amount of output capacitance, saving both board space and cost.
ESR EFFECTS ESL EFFECTS SLOPE, V = I t C POINT AT WHICH REGULATOR TAKES CONTROL CAPACITANCE EFFECTS
Stability and Transient Response
Like most low dropout voltage regulators, the TCL158x devices require the use of output capacitors to maintain stability. Normally a 22F solid tantalum or a 100F aluminum electrolytic unit will ensure stability over all operating conditions. Keep in mind that commercially available capacitors can have significant non-ideal effects such as capacitance value tolerance, temperature coefficient, ESR, ESL. The TCL158x devices are optimized for use with low ESR (<1) capacitors. On the adjustable voltage versions, bypassing the ADJ pin will improve ripple rejection and transient response. This is discussed in the Ripple Rejection section. This bypassing increases the required output capacitance value. The previously suggested minimum values (22F and 100F) take this into account. If no bypassing is used, lower values of output capacitance may be used. Transient regulation is directly related to output capacitance value. For applications which require large load current step changes, it is recommended that large output capacitors (>100F) be used. The value of the output capacitor can be increased without limit and will only improve transient regulation. In a typical high-performance microprocessor application, the sudden transients can be so fast that the output decoupling network must handle the sudden current demand until the internal voltage regulator is able to respond. In this case the non-ideal effects of the output capacitor are critical in determining the regulator's response. Output voltTCL1584/1585/1587-04 6/6/97
Figure 1. Transient Load Voltage Response
Typically high quality ceramic and tantalum capacitors must be used in combination to minimize ESR and maximize C. This decoupling network must also be placed close to the microprocessor to reduce ESL (parasitic board trace inductance). If possible, the capacitors should be placed inside the microprocessor socket cavity. Of course, robust power and ground planes will also improve performance by reducing parasitic voltage drops. The TCL1584 has an adaptive current limiting scheme where to ensure SOA for the output transistor, the current limit is reduced for increasing input to output differential. This means that the TCL1584 exhibits a negative resistance characteristic under certain conditions. This is a common technique in LDO design to ensure SOA - especially LDO's with high maximum input voltage ratings. This negative resistance can interact with the external capacitance and inductance and cause oscillations during current limit. This effect is highly dependent on system parameters and is difficult to predict. However this oscillation, if it occurs, will not damage the regulator and can be ignored if the system
5
PRELIMINARY INFORMATION
TCL1584 TCL1585 TCL1587
parameters will allow it. Typically, increasing the output capacitance helps reduce the oscillation. NOTE: The TCL1585 and TCL1584 have fixed current limit over the entire voltage range and are not susceptible to this phenomenon.
7A / 5A / 4.6A / 3A, FAST RESPONSE, LOW DROPOUT POSITIVE LINEAR VOLTAGE REGULATORS
Overload Recovery
The built-in Short Circuit and Safe-Operating-Area (SOA) protection function of the TCL158x family can cause secondary effects which must be considered for robust system design. The behavior of the regulator under heavy loads (short circuit) at start-up is such that the output voltage will remain low while sourcing maximum current until the load is removed or reduced. Normally, the output voltage will rise as the load is reduced and trace a line I-V relationship according to the SOA limit. If the load line intersects this output curve at two points the output voltage may not recover from the heavy load/short-circuit condition. This condition is illustrated in Figure 3. The current limit constraint does not allow any load point above it and the load line is defined absolutely by the I-V characteristics of the load (a resistor, in this case). Under these conditions it may be necessary to cycle the power supply off and then on again. This phenomenon is common for LDO's with fold-back current limiting schemes. NOTE: Overload recovery is always guaranteed on the TCL1585 and TCL1587 because of the constant current limit characteristic.
Protection Diodes
The TCL158x family of devices do not normally require any external current limiting circuitry such as protection diodes, frequently used with older LDO regulators. A diode is internally present between the output and input which is capable of handling short-duration surge currents of up to 100A. This capability typically ensures safe operation except for the case where output capacitance is exceedingly large (>1000F) and the input is suddenly shorted to ground. This situation can produce excessive reverse current in the device - enough to cause damage. An external high current diode should be used as shown in Figure 2. The ADJ pin does not normally need protection diodes either. It can handle 7V without any performance degradation or device damage. Current at this pin is internally limited by a series resistor so the bypass capacitors do not present any danger. Of course, exceeding 7V differential between any two pins will cause catastrophic junction breakdowns and possible damage to the device.
Ripple Rejection
A typical ripple rejection curve for the fixed output voltage devices is shown in Figure 3. It is possible to obtain improved performance in ripple rejection by using the adjustable output TCL158x with a bypass capacitor (CADJ) shown in Figure 2. This capacitor should be chosen to have a value such that its impedance at the ripple frequency is less than R1 (see Figure 2.). Usually this is on the order of 100. Example: If R1 = 100 and fRIPPLE = 120Hz, the bypass capacitor should be chosen to be 22F or greater. If these conditions are met the ripple rejection will be improved by a factor of VOUT/1.25 when compared to the performance of the fixed output devices.
D1 1N4002 (OPTIONAL)
VIN
IN TCL1584-3.3 OUT GND
VOUT
+
C1 10F
+
C2 22F
D1 1N4002 (OPTIONAL)
Current Limit Curve
VIN C1 + 10F
IN
TCL1584 ADJ
OUT R1
VOUT
+
C2 22F
IOUT Load Line
Unrecoverable I-V Point Start Up Point
+
CADJ
R2
Figure 2. Protection Diodes and CADJ
VIN - VOUT (Constant VIN)
Figure 3. Overload Recovery
TCL1584/1585/1587-04 6/6/97
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7A / 5A / 4.6A / 3A, FAST RESPONSE, LOW DROPOUT POSITIVE LINEAR VOLTAGE REGULATORS
PRELIMINARY INFORMATION
TCL1584 TCL1585 TCL1587
RP PARASITIC LINE RESISTANCE VIN IN TCL1584-3.3 OUT GND RL
Output Voltage
The output voltage for the fixed output versions of the TCL158x is set internally and cannot be adjusted. For the adjustable output versions, the output voltage is set by two external resistors: R1 and R2 (see Figure 3). A 1.25V reference voltage is maintained between the OUTPUT pin and the ADJ pin. NOTE: the ADJ pin typically will source 55A. R1 should be chosen to conduct at least the specified minimum load current of 10mA (i.e. at most 125). Now R2 will determine the total output voltage according to the equation below: VOUT = VREF(1+ R2/R1) + R2(IADJ) The contribution due to the IADJ term is relatively small as IADJ is only 55A compared to 10mA for the total current in the adjust circuit.
Figure 5. Connection for Best Load Regulation
In both cases, because the effect of parasitic trace resistance (RP) cannot be completely eliminated, it is important to keep the positive output lead as short as possible. Otherwise, at high output currents, the load regulation will degrade appreciably. Example: RP = 5m IOUT = 3A VDROP = (0.005) x (3) = 15mV
VIN C1 + 10F
IN
TCL1584 ADJ IADJ 55A
OUT VREF R1
VOUT C2 22F
VOUT = VREF 1+ R2 R1
(
) + IADJ (R2)
R2
VIN IN TCL1584 ADJ OUT
RP PARASITIC LINE RESISTANCE
Figure 4. Adjustable Voltage Regulator
Load Regulation
Because the TCL158x family are three terminal devices, it is not possible to perform true Kelvin load voltage sensing. Therefore load regulation is limited somewhat by parasitic trace resistance. The load regulation specifications are measured directly at the TCL158x package. To minimize degradation in load regulation performance the following guidelines should be used. For fixed voltage devices, the GND pin should be connected directly to the negative side of the load instead of to a common ground bus. This provides Kelvin sensing at the negative side while the positive side is still limited by RP (See Figure 5). For adjustable output devices, the bottom of R2 connects to the negative side of the load. For the positive side, best regulation is obtained when the top of R1 is connected directly to the TCL158x and not to the load (See Figure 6). If R1 connects to the load the effective resistance between the output and the load is: RP x (1 + R2/R1)
TCL1584/1585/1587-04 6/6/97
R1* RL
R2*
*CONNECT R1 TO CASE CONNECT R2 TO LOAD
Figure 6. Connection for Best Load Regulation
Thermal Considerations
The TCL158x family includes built-in thermal overload protection. However, maximum operating junction temperature must not be exceeded for any condition. Since these devices are capable of dissipating up to 25W or more under some conditions, careful thermal design is required for reliable, continuous operation. In most cases, external heat sinking will be required.
7
PRELIMINARY INFORMATION
TCL1584 TCL1585 TCL1587
When generating the overall thermal design, it is important to consider all sources of thermal resistance between the silicon die and ambient - junction-to-case (JC), case-toheat sink (CH), heat sink-to-ambient (HA). NOTE: there are two separate JC specifications for the power transistor and the control circuitry. Both junction temperatures must be calculated and kept under each respective maximum limit to ensure proper operation. This JC is for the physical path between the die and the bottom metal portion of the case (both TO-220 and DDPAK-3. Heat flow will be greatest through this path. It is important that good thermal coupling is made between the case and heat sink. If electrical isolation from the heat sink is not required, it is recommended that thermally conductive compound be used. Otherwise, use a thermally conductive dielectric spacer. The following is a thermal design example: Using a TCL1585-3.3 in a TO-220 package: Assumptions: TA = +70C VIN = 5.25V (5V + 5%) VOUT = 3.30V IOUT = 4.6A HA = 3.5C/W (heat sink-to-ambient) CH = 1.5C/W (case-to-heat sink) JC = 3C/W (power transistor) JC = 0.7C/W (control circuitry) Power dissipation: PD = (VIN - VOUT)(IOUT) = (5.25 - 3.3)(4.6) = 8.97W Junction Temperatures: TJ = TA + PD(HA + CH + JC) Control Circuitry: TJ = 70 + 8.97(3.5 + 1.5 + 0.7) = 121.1C Power Transistor: TJ = 70 + 8.97(3.5 + 1.5 + 3) = 141.8C These values for TJ fall within the maximum allowed junction temperature for each die section indicating adequate heat sinking with some margin.
7A / 5A / 4.6A / 3A, FAST RESPONSE, LOW DROPOUT POSITIVE LINEAR VOLTAGE REGULATORS
NOTE: Without heat sinking, the thermal resistance for the TO-220 and DDPAK-3 packages are 53C/W and 76C/W respectively.
TCL1584/1585/1587-04 6/6/97
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7A / 5A / 4.6A / 3A, FAST RESPONSE, LOW DROPOUT POSITIVE LINEAR VOLTAGE REGULATORS
PRELIMINARY INFORMATION
TCL1584 TCL1585 TCL1587
TYPICAL APPLICATIONS
Typical IntelTM* 486Dx4 Microprocessor Application
PLACE AT MICROPROCESSOR SOCKET VCC PINS 3.30V 3A C2 22F 10V C3 TO C6 47F 10V C7 TO C15 0.1F C16 TO C24 0.01F
VIN 4.75V C1 10F 10V
VIN
VOUT TCL1587-3.3 GND
ESR OF THE 47F IS < 0.1
IntelTM* 90MHz PentiumTM* Power Supply
THERMALLOY 7020B-MT PLACE IN MICROPROCESSOR SOCKET CAVITY 3.38V 4.6A R1 110 0.1% R2 187 0.1% C5 TO C10 100F 10V AVX TPS 6 EACH C11 TO C20 1F 16V AVX Y5V 0805 10 EACH
4.75V TO 5.25V C1 TO C3 220F 10V AVX TPS 3 EACH
VIN
TCL1585 ADJ
VOUT
C4 330F 16V AVX X7R 0805
AVX Corp. (803) 448-9411 Sanyo Video Components (USA) Corp. (619) 661-6322 Thermalloy Inc. (214) 243-4321 DO NOT SUBSTITUTE COMPONENTS
Transient Response for 3.8A Load Current Step*
VOUT 50mV/DIV
IOUT 2A/DIV
100sec/DIV *TRANSIENT RESPONSE MEASURED WITH AN INTEL POWER VALIDATORTM. VOUT IS MEASURED AT THE POWER VALIDATOR.
All Trademarks and Trade Names are the property of their respective owners.
TCL1584/1585/1587-04 6/6/97
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PRELIMINARY INFORMATION
TCL1584 TCL1585 TCL1587
TYPICAL APPLICATIONS (Cont.)
7A / 5A / 4.6A / 3A, FAST RESPONSE, LOW DROPOUT POSITIVE LINEAR VOLTAGE REGULATORS
Typical IntelTM* PentiumTM* Pro GTL+ Bus Terminator Application Using TCL1587-1.5
VOUT = 1.5V @ 3A VIN = 5V or 3.3V C1 = 10F VIN VOUT TCL1587-1.5 GND C2 = 10F (Tantalum) RTERM C3 =1F x 5 = 100 x 71 (Ceramic) Lines
RREF
GTL+ Bus (ZO)
VREF = 1.0V
VOUT = 1.5V @ 3A VIN = 5V or 3.3V C1 = 10F VIN VOUT TCL1587-1.5 GND C2 = 10F (Tantalum) C3 = 1F x 5 (Ceramic)
RTERM = 100 x 71 Lines
2RREF
NOTES: 1. It is recommended that the GTL+ bus be terminated at each end by a separate regulator to avoid power distribution losses. 2. The GTL+ bus transmission line symbol will consist of all the components (chip set IC's) on the GTL+ bus. 3. RREF and 2RREF should be chosen such that VREF loading does not appreciably degrade VREF regulation. Values <100 ohms should suffice for most applications. 4. RTERM will be determined by individual bus physical/electrical parameters. See CPU manufacturer documentation for application information.
*All Trademarks and Trade Names are the property of their respective owners.
TCL1584/1585/1587-04 6/6/97
10
7A / 5A / 4.6A / 3A, FAST RESPONSE, LOW DROPOUT POSITIVE LINEAR VOLTAGE REGULATORS
PRELIMINARY INFORMATION
TCL1584 TCL1585 TCL1587
TYPICAL CHARACTERISTICS
TCL1584 Dropout Voltage vs. Output Current
1.5
TCL1584 Short Circuit Current vs. Input/Output Differential
OUTPUT VOLTAGE DEVIATION (%)
10 0.10 0.05 0 -0.05 -0.10 -0.15
TCL1584 Load Regulation vs. Temperature
I = 7A
SHORT-CIRCUIT CURRENT (A)
DROPOUT VOLTAGE (V)
1.4 1.3 1.2 1.1 1.0 0.9 0.8 0.7 0.6 0.5 0
INDICATES GUARANTEED TEST POINT T = 25C T = 125C T = - 5C
8
6 T = 125C T = 25C
4
T = - 5C MINIMUM
2 0
1
2
3
4
5
6
7
0
1
2
3
4
5
6
7
OUTPUT CURRENT (A)
INPUT/OUTPUT DIFFERENTIAL (V)
-0.20 -75 -50 -25 0 25 50 75 100 125 150 175 TEMPERATURE (C)
TCL1585 Dropout Voltage vs. Output Current
1.5 6.0
TCL1585 Short-Circuit Current vs. Temperature
0.10
TCL1585 Load Regulation vs. Temperature
OUTPUT VOLTAGE DEVIATION (%)
I = 4.6A
DROPOUT VOLTAGE (V)
1.4 1.3 1.2 1.1 1.0 0.9 0.8 0.7 0.6 0.5 0
INDICATES GUARANTEED TEST POINT T = 25C T = 125C T = - 5C
SHORT-CIRCUIT CURRENT (A)
0.05 0 -0.05 -0.10 -0.15 -0.20 -75 -50 -25 0 25 50 75 100 125 150 175 TEMPERATURE (C)
5.5
5.0
4.5
1
2
3
4
5
4.0 -75 -50 -25 0 25 50 75 100 125150 175 TEMPERATURE (C)
OUTPUT CURRENT (A)
TCL1587 Dropout Voltage vs. Output Current
1.5 1.4
TCL1587 Short-Circuit Current vs. Temperature
OUTPUT VOLTAGE DEVIATION (%)
5.0 0.10 0.05 0 -0.05 -0.10 -0.15 -0.20
TCL1587 Load Regulation vs. Temperature
I = 3A
1.3 1.2 1.1 1.0 0.9 0.8 0.7 0.6 0.5 0
INDICATES GUARANTEED TEST POINT T = 25C T = 125C T = - 5C
SHORT-CIRCUIT CURRENT (A)
3.0
DROPOUT VOLTAGE (V)
4.5
4.0
3.5
0.5
1.0
1.5
2.0
2.5
3.0 -75 -50 -25 0 25 50 75 100 125150 175 TEMPERATURE (C)
-75 -50 -25 0 25 50 75 100 125 150 175 TEMPERATURE (C)
OUTPUT CURRENT (A)
TCL1584/1585/1587-04 6/6/97
11
PRELIMINARY INFORMATION
TCL1584 TCL1585 TCL1587
TYPICAL CHARACTERISTICS (Cont.)
TCL1584/5/7 Reference Voltage vs. Temperature
1.275 REFERENCE VOLTAGE (V) 1.270 OUTPUT VOLTAGE (V) 1.265 1.260 1.255 1.250 1.245 1.240 1.235 1.230 1.255 -75 -50 -25 0 25 50 75 100 125 150 175 TEMPERATURE (C) 3.70 3.65 3.60 3.55 3.50 3.45 3.40 3.35 3.30 3.25
7A / 5A / 4.6A / 3A, FAST RESPONSE, LOW DROPOUT POSITIVE LINEAR VOLTAGE REGULATORS
Output Voltage vs Temperature Using Adjustable TCL1584/5/7
VOUT SET WITH 1% RESISTORS VOUT = 3.6V OUTPUT VOLTAGE (V)
TCL1584/5/7-3.3 Output Voltage vs.Temperature
3.70 3.65 3.60 3.55 3.50 3.45 3.40 3.35 3.30 3.25 3.20 -75 -50 -25 0 25 50 75 100 125 150 175 TEMPERATURE (C) VOUT = 3.3V
VOUT = 3.45V VOUT = 3.38V VOUT = 3.3V
3.20 -75 -50 -25 0 25 50 75 100 125 150 175 TEMPERATURE (C)
TCL1584/5/7 Minimum Load Current vs. Temperature
5 MINIMUM LOAD CURRENT (mA) ADJUST PIN CURRENT (A) 100 90 80 70 60 50 40 30 20 10
TCL1584/5/7 Adjust Pin Current vs. Temperature
13 QUIESCENT CURRENT (mA) 12 11 10 9 8 7 6 5 4
TCL1584/5/7-3.xx Quiescent Current vs. Temperature
4 3 2
1 0 -75 -50 -25 0 25 50 75 100 125 150 175 TEMPERATURE (C)
0 -75 -50 -25 0 25 50 75 100 125 150 175 TEMPERATURE (C)
3 -75 -50 -25 0 25 50 75 100 125 150 175 TEMPERATURE (C)
TCL1584/5/7 Ripple Rejection vs. Frequency
90
TCL1585/7 Maximum Power Dissipation*
30 25 POWER (W) POWER (W) 20 15 10 5 0 TCL1587 TCL1585 30
TCL1584 Maximum Power Dissipation*
TCL1584 25 20 15 10 5 0
RIPPLE REJECTION (dB)
80 70 60 50 40 30 20 10 0 10 100 1k 10k 100k
TCL1584: (VIN - VOUT) 2.5V TCL1584/87 (VIN - VOUT) 3V 0.5V VRIPPLE 2V IOUT = IFULL LOAD
50 60 70 80 90 100 110 120 130 140 150 CASE TEMPERATURE (C)
*AS LIMITED BY MAXIMUM JUNCTION TEMPERATURE
FREQUENCY (Hz)
50 60 70 80 90 100 110 120 130 140 150 CASE TEMPERATURE (C)
*AS LIMITED BY MAXIMUM JUNCTION TEMPERATURE
TCL1584/1585/1587-04 6/6/97
12
7A / 5A / 4.6A / 3A, FAST RESPONSE, LOW DROPOUT POSITIVE LINEAR VOLTAGE REGULATORS
PRELIMINARY INFORMATION
TCL1584 TCL1585 TCL1587
PACKAGE DIMENSIONS DDPAK-3
.410 (10.41) .385 (9.78) .067 (1.70) .045 (1.14) 3 - 7 (5x) .010 (0.25) .000 (0.00) .051 (1.30) .049 (1.24) .037 (0.94) .026 (0.66) .100 (2.54) TYP. 0 - 8 0.26 (0.66) 0.14 (0.36) .110 (2.79) .068 (1.72) .183 (4.65) .170 (4.32)
.055 (1.40) .045 (1.14)
.370 (9.40) .329 (8.38) .605 (15.37) .549 (13.95)
TO-220-3
.410 (10.41) .390 (9.91) .156 (3.96) .146 (3.71) DIA.
.185 (4.70) .165 (4.19)
.113 (2.87) .103 (2.62)
.055 (1.40) .045 (1.14)
.258 (6.55) .230 (5.84) .594 (15.09) .569 (14.45) 3 - 7.5 5 PLCS.
.244 (6.20) .234 (5.94) .560 (14.22) .518 (13.16) .055 (1.40) .045 (1.14) .037 (0.94) .027 (0.69) .105 (2.67) .095 (2.41) .205 (5.21) .195 (4.95)
.0.20 (0.51) .012 (0.30)
.115 (2.92) .095 (2.41)
Dimensions: inches (mm)
Sales Offices
TelCom Semiconductor 1300 Terra Bella Avenue P.O. Box 7267 Mountain View, CA 94039-7267 TEL: 415-968-9241 FAX: 415-967-1590 E-Mail: liter@c2smtp.telcom-semi.com
TCL1584/1585/1587-04 6/6/97
TelCom Semiconductor Austin Product Center 9101 Burnet Rd. Suite 214 Austin, TX 78758 TEL: 512-873-7100 FAX: 512-873-8236 13
TelCom Semiconductor H.K. Ltd. 10 Sam Chuk Street, Ground Floor San Po Kong, Kowloon Hong Kong TEL: 852-2324-0122 FAX: 852-2354-9957
Printed in the U.S.A.

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