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PDF TCL1587 Data sheet ( Hoja de datos )

Número de pieza TCL1587
Descripción 7A / 5A / 4.6A / 3A/ FAST RESPONSE/ LOW DROPOUT POSITIVE LINEAR VOLTAGE REGULATORS
Fabricantes TelCom Semiconductor 
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7A / 5A / 4.6A / 3A, FAST RESPONSE,
LOW DROPOUT POSITIVE LINEAR
VOLTAGE REGULATORS
PRELIMINARY INFORMATION
TTCCLL11558844
TTCCLL1155885
TTCCLL1155887
7A / 5A / 4.6A / 3A, FAST RESPONSE, LOW DROPOUT
POSITIVE LINEAR VOLTAGE REGULATORS
FEATURES
s Fixed and Adjustable Voltages ........ 1.5V and 3.3V
s Optimized for Low Voltage Applications
s Output Current Capability ..........7A / 5A / 4.6A / 3A
s Guaranteed Dropout Voltage up to Full Rated
Output
s Integrated Thermal and Short-Circuit Protection
s Compact 3-Pin Surface-Mount and Thru-Hole
Standard Power Packages
s VREF Accuracy ................................................. 2.0%
s Load Regulation ............................................. 0.05%
APPLICATIONS
s PentiumTM*, PentiumProTM* CPU Power Supplies
s PowerPCTM* CPU Power Supplies
s PentiumProTM* System GTL+ Bus Terminators
s Low-Voltage, High Speed Microprocessors
s Post-Regulator for Switch-Mode Power Supplies
GENERAL DESCRIPTION
PIN CONFIGURATIONS
TO-220-3
DDPAK-3
TCL1584CAB
TCL1585CAB
TCL1587CAB
123
123
TCL1584CEB
TCL1585CEB
TCL1587CEB
NOTE: For TO-220 ΘJA = 53°C/W. For DDPAK-3 ΘJA = 76°C/W. ΘJA for both packages
are specified without external heat sinks. See Applications Section for details.
The TCL1584/1585/1587 are low dropout, positive lin-
ear 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 drop-
out voltage makes these devices ideal for the latest low
voltage microprocessor power supplies. Additionally, short-
circuit, 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.
ORDERING INFORMATION
Part Number
Package
TCL1584-3.3CAB
TCL1584-3.3CEB
TCL1584-ADJCAB
TCL1584-ADJCEB
TO-220-3
DDPAK-3
TO-220-3
DDPAK-3
TCL1585-1.5CAB
TCL1585-1.5CEB
TCL1585-3.3CAB
TCL1585-3.3CEB
TCL1585-ADJCAB
TCL1585-ADJCEB
TO-220-3
DDPAK-3
TO-220-3
DDPAK-3
TO-220-3
DDPAK-3
TCL1587-1.5CAB
TCL1587-1.5CEB
TCL1587-3.3CAB
TCL1587-3.3CEB
TCL1587-ADJCAB
TCL1587-ADJCEB
TO-220-3
DDPAK-3
TO-220-3
DDPAK-3
TO-220-3
DDPAK-3
Temp. Range
0°C to + 70°C
0°C to + 70°C
0°C to + 70°C
0°C to + 70°C
0°C to + 70°C
0°C to + 70°C
0°C to + 70°C
0°C to + 70°C
0°C to + 70°C
0°C to + 70°C
0°C to + 70°C
0°C to + 70°C
0°C to + 70°C
0°C to + 70°C
0°C to + 70°C
0°C to + 70°C
TYPICAL OPERATING CIRCUIT
VIN = 5V
C1 = 10µF
Fixed Output Voltage Version
VIN VOUT
TCL158x-3.3
GND
VOUT = 3.3V
C2*
(Tantalum)
Adjustable Output Voltage Version
VIN = 5V
C1 = 10µF
VIN VOUT
TCL158x
ADJ
R1
VOUT =
(1+ R1/R2)VREF
C2*
(Tantalum)
*NOTE: C2 is required to ensure output stability. Minimum 22µF (TCL1584) or 10µF (TCL1585/7),
low ESR tantalum type. Larger values may be required for high output current transient
regulation. See Applications section.
*All Trademarks and Trade Names are the property of their respective owners.
TCL1584/1585/1587-04 6/6/97
1
TCL1584/1585/1587-04 6/6/97 TelCom Semiconductor reserves the right to make changes in the circuitry and specifications of its devices.
R2

1 page




TCL1587 pdf
7A / 5A / 4.6A / 3A, FAST RESPONSE,
LOW DROPOUT POSITIVE LINEAR
VOLTAGE REGULATORS
PRELIMINARY INFORMATION
TCL1584
TCL1585
TCL1587
APPLICATIONS
age response to step load current change is illustrated in
General
Figure 1. The capacitor’s ESR and ESL cause immediate
step changes in the output voltage. These are calculated as
The TCL158x family of devices combine high current follows:
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 short-
circuit current limit, over-temperature limit, and safe-operat-
ing-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
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 calcu-
lated as follows:
several amps in a time period measured in tens of nanosec-
onds. Load step response requirements are worsened by
V = t x I/C
tighter output voltage tolerances. The TCL1584/85/87 fam-
ily of regulators meets these stringent requirements without
an obnoxious amount of output capacitance, saving both
board space and cost.
Stability and Transient Response
Like most low dropout voltage regulators, the TCL158x
devices require the use of output capacitors to maintain
stability. Normally a 22µF solid tantalum or a 100µF alumi-
num electrolytic unit will ensure stability over all operating
ESR
EFFECTS
ESL
EFFECTS
CAPACITANCE
EFFECTS
V
SLOPE, t
=
I
C
POINT AT WHICH REGULATOR
TAKES CONTROL
conditions. Keep in mind that commercially available ca-
pacitors can have significant non-ideal effects such as
capacitance value tolerance, temperature coefficient, ESR,
Figure 1. Transient Load Voltage Response
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 previ-
ously suggested minimum values (22µF and 100µF) take
this into account. If no bypassing is used, lower values of
output capacitance may be used.
Transient regulation is directly related to output capaci-
tance value. For applications which require large load cur-
rent step changes, it is recommended that large output
capacitors (>100µF) be used. The value of the output
capacitor can be increased without limit and will only im-
prove transient regulation.
In a typical high-performance microprocessor applica-
tion, the sudden transients can be so fast that the output
decoupling network must handle the sudden current de-
mand 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 volt-
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 induc-
tance). If possible, the capacitors should be placed inside
the microprocessor socket cavity. Of course, robust power
and ground planes will also improve performance by reduc-
ing 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
TCL1584/1585/1587-04 6/6/97
5

5 Page





TCL1587 arduino
7A / 5A / 4.6A / 3A, FAST RESPONSE,
LOW DROPOUT POSITIVE LINEAR
VOLTAGE REGULATORS
TYPICAL CHARACTERISTICS
PRELIMINARY INFORMATION
TCL1584
TCL1585
TCL1587
TCL1584 Dropout Voltage vs.
Output Current
1.5
1.4
1.3
1.2 T = – 5°C
1.1
1.0 T = 125°C
0.9 T = 25°C
0.8
0.7
0.6
0.5
0
INDICATES GUARANTEED TEST POINT
1 2345 67
OUTPUT CURRENT (A)
TCL1584 Short Circuit Current
vs. Input/Output Differential
10
8
6
T = 125°C
T = 25°C
4
T = – 5°C
MINIMUM
2
0
0 1 2 3 4 5 67
INPUT/OUTPUT DIFFERENTIAL (V)
TCL1584 Load Regulation
vs. Temperature
0.10
I = 7A
0.05
0
–0.05
–0.10
–0.15
–0.20
–75 –50 –25 0 25 50 75 100 125 150 175
TEMPERATURE (°C)
TCL1585 Dropout Voltage vs.
Output Current
1.5
1.4
1.3 T = – 5°C
1.2
1.1
1.0 T = 125°C
0.9 T = 25°C
0.8
0.7
0.6
0.5 INDICATES GUARANTEED TEST POINT
0 1 2 3 45
OUTPUT CURRENT (A)
TCL1587 Dropout Voltage vs.
Output Current
1.5
1.4
1.3
1.2 T = – 5°C
1.1
1.0 T = 25°C
0.9
T = 125°C
0.8
0.7
0.6
0.5
0
INDICATES GUARANTEED TEST POINT
0.5 1.0 1.5 2.0 2.5 3.0
OUTPUT CURRENT (A)
TCL1584/1585/1587-04 6/6/97
TCL1585 Short-Circuit Current
vs. Temperature
6.0
5.5
5.0
4.5
4.0
–75 –50 –25 0 25 50 75 100 125150 175
TEMPERATURE (°C)
TCL1585 Load Regulation
vs. Temperature
0.10
I = 4.6A
0.05
0
–0.05
–0.10
–0.15
–0.20
–75 –50 –25 0 25 50 75 100 125 150 175
TEMPERATURE (°C)
TCL1587 Short-Circuit Current
vs. Temperature
5.0
4.5
4.0
3.5
3.0
–75 –50 –25 0 25 50 75 100 125150 175
TEMPERATURE (°C)
11
TCL1587 Load Regulation
vs. Temperature
0.10
0.05
I = 3A
0
–0.05
–0.10
–0.15
–0.20
–75 –50 –25 0 25 50 75 100 125 150 175
TEMPERATURE (°C)

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