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
V
REF
Accuracy ................................................. 2.0%
Load Regulation ............................................. 0.05%
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.
APPLICATIONS
s
s
s
s
s
Pentium
TM*
, PentiumPro
TM*
CPU Power Supplies
PowerPC
TM*
CPU Power Supplies
PentiumPro
TM*
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
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
GENERAL DESCRIPTION
PIN CONFIGURATIONS
TO-220-3
DDPAK-3
1
2
3
1
2
3
TCL1584CAB
TCL1585CAB
TCL1587CAB
ADJ/GND
ADJ/GND
V
OUT
V
OUT
V
IN
V
IN
TCL1584CEB
TCL1585CEB
TCL1587CEB
NOTE:
For TO-220
Θ
JA
= 53°C/W. For DDPAK-3
Θ
JA
= 76°C/W.
Θ
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
V
IN
= 5V
C1 = 10µF
V
IN
V
OUT
TCL158x-3.3
GND
V
OUT
= 3.3V
C2*
(Tantalum)
V
IN
= 5V
C1 = 10µF
Adjustable Output Voltage Version
V
IN
TCL158x
ADJ
V
OUT
R1
V
OUT
=
(1+ R1/R2)V
REF
C2*
(Tantalum)
R2
*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.
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 (V
IN
to GND) ...........................................7V
Operating Junction Temperature Range
Control Circuitry ................................... 0°C to +125°C
Output Transistor ................................. 0°C to +150°C
Power Dissipation ..................... See
Applications
Section
Storage Temperature (unbiased) .......... – 65°C to +150°C
Lead Temperature (Soldering, 10 sec) ................. +300°C
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:
T
A
= Operating Temperature Range, 4.75V
≤
V
IN
≤
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
≤
(V
IN
– V
OUT
)
≤
3V, 10mA
≤
I
OUT
≤
7A
1.5V
≤
(V
IN
– V
OUT
)
≤
5.75V, 10mA
≤
I
OUT
≤
4.6A, T
J
≥
25°C
1.5V
≤
(V
IN
– V
OUT
)
≤
5.75V, 10mA
≤
I
OUT
≤
4A, T
J
< 25°C
TCL1587
1.5V
≤
(V
IN
– V
OUT
)
≤
5.75V, 10mA
≤
I
OUT
≤
3A
Output
TCL1587-1.5
4.75V
≤
V
IN
≤
7V, 0mA
≤
I
OUT
≤
3A
Voltage
TCL1584-3.3
4.75V
≤
V
IN
≤
6.3V, 0mA
≤
I
OUT
≤
7A
TCL1585-3.3
4.75V
≤
V
IN
≤
7V, 0mA
≤
I
OUT
≤
4.6A, T
J
≥
25°C
4.75V
≤
V
IN
≤
7V, 0mA
≤
I
OUT
≤
4A, T
J
< 25°C
TCL1587-3.3
4.75V
≤
V
IN
≤
7V, 0mA
≤
I
OUT
≤
3A
Line
TCL1584/5/7
2.75V
≤
V
IN
≤
7V, I
OUT
= 10mA
Regulation TCL1587-1.5
4.75V
≤
V
IN
≤
7V, I
OUT
= 0mA
(Notes 1, 2) TCL1584/5/7-3.3 4.75V
≤
V
IN
≤
7V, I
OUT
= 0mA
Load
TCL1584/5/7
(V
IN
– V
OUT
) = 3V, T
J
= 25°C, 10mA
≤
I
OUT
≤
I
FULL LOAD
Regulation TCL1587-1.5
V
IN
= 5V, T
J
= 25°C, 0mA
≤
I
OUT
≤
I
FULL LOAD
(Notes 1, TCL1584/5/7-3.3 V
IN
= 5V, T
J
= 25°C, 0mA
≤
I
OUT
≤
I
FULL LOAD
2, 3)
Over Operating Temperature Range
Dropout
TCL1585/7
∆V
REF
= 1%, I
OUT
= 3A
Voltage
TCL1587-1.5
∆V
OUT
= 1%, I
OUT
= 3A
TCL1585/7-3.3
∆V
OUT
= 1%, I
OUT
= 3A
TCL1585
∆V
REF
= 1%, I
OUT
= 4.6A, T
J
≥
25°C
∆V
REF
= 1%, I
OUT
= 4A, T
J
< 25°C
TCL1585-3.3
∆V
OUT
= 1%, I
OUT
= 4.6A, T
J
≥
25°C
∆V
OUT
= 1%, I
OUT
= 4A, T
J
< 25°C
TCL1584
∆V
REF
= 1%, I
OUT
= 6A
TCL1584-3.3
∆V
OUT
= 1%, I
OUT
= 6A: T
J
≥
25°C
T
J
< 25°C
TCL1584
∆V
REF
= 1%, I
OUT
= 7A
TCL1584-3.3
∆V
OUT
= 1%, I
OUT
= 7A
Current
TCL1584
(V
IN
– V
OUT
) = 3V
7.10
Limit
TCL1584-3.3
(V
IN
– V
OUT
) = 3V
(Note 3)
TCL1585
(V
IN
– V
OUT
) = 5.5V: T
J
< 25°C
TCL1585-3.3
(V
IN
– V
OUT
) = 5.5V: T
J
≥
25°C
TCL1587
(V
IN
– V
OUT
) = 5.5V
TCL1587-1.5
(V
IN
– V
OUT
) = 5.5V
TCL1587-3.3
(V
IN
– V
OUT
) = 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
µA
2
7A / 5A / 4.6A / 3A, FAST RESPONSE,
LOW DROPOUT POSITIVE LINEAR
VOLTAGE REGULATORS
PRELIMINARY INFORMATION
TCL1584
TCL1585
TCL1587
ELECTRICAL CHARACTERISTICS:
(Cont.)
T
A
= Operating Temperature Range, 4.75V
≤
V
IN
≤
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
≤
(V
IN
– V
OUT
)
≤
3V, 10mA
≤
I
OUT
≤
I
FULL LOAD
1.5V
≤
(V
IN
– V
OUT
)
≤
5.75V, 10mA
≤
I
OUT
≤
I
FULL LOAD
Min
—
Typ
0.2
Max
5
Unit
µA
TCL1584/5/7
1.5V
≤
(V
IN
–V
OUT
)
≤
5.75V
—
2
10
mA
V
IN
= 5V
V
IN
= 5V
f = 120Hz, C
OUT
= 25µF Tant. (V
IN
– V
OUT
) = 2.5V, I
OUT
= 7A
f = 120Hz, C
OUT
= 25µF Tant., V
IN
= 5.8V, I
OUT
= 7A
f = 120Hz, C
OUT
= 25µF Tant., (V
IN
– V
OUT
) = 3V, I
OUT
= 4.6A, T
J
≥
25°C
f = 120Hz, C
OUT
= 25µF Tant., (V
IN
– V
OUT
) = 3V, I
OUT
= 4A, T
J
≤
25°C
TCL1585-3.3
f = 120Hz, C
OUT
= 25µF Tant.,V
IN
= 6.3V, I
OUT
= 4.6A, T
J
≥
25°C
f = 120Hz, C
OUT
= 25µF Tant.,V
IN
= 6.3V, I
OUT
= 4.6A, T
J
≤
25°C
TCL1587
f = 120Hz, C
OUT
= 25µF Tant., (V
IN
– V
OUT
) = 3V, I
OUT
= 3A
TCL1587-1.5
f = 120Hz, C
OUT
= 25µF Tant., V
IN
= 5.0V, I
OUT
= 3A
TCL1587-3.3
f = 120Hz, C
OUT
= 25µF Tant., V
IN
= 6.3V, I
OUT
= 3A
Thermal
TCL1584/5/7
T
A
= 25°C, 30msec Pulse
Regulation TCL1587-1.5
T
A
= 25°C, 30msec Pulse
TCL1584/5/7-3.3 T
A
= 25°C, 30msec Pulse
Temperature
V
IN
= 5V, I
OUT
= 0.5A
Stability
Long Term
T
A
= 125°C, 1000Hrs.
Stability
RMS
T
A
= 25°C, 10Hz
≤
f
≤
10kHz
Output
Noise (%
of V
OUT
)
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,
Θ
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. I
FULL LOAD
is defined as the maximum value of output load current as a function of input-to-output voltage. I
FULL LOAD
is a nominal 7A for
TCL1584, decreasing to approximately 3A as V
IN
– V
OUT
increases from 3V to 7V. For all other fixed voltage TCL1585’s, I
FULL LOAD
is 4A. For
the TCL1587, I
FULL LOAD
is 3A. The TCL1585 and 1587 have constant current limit with respect to V
IN
and V
OUT
.
TCL1584/1585/1587-04 6/6/97
3
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
V
IN
+
TCL1584/5/7
–
V
OUT
THERMAL
LIMIT
ADJ
GND
FOR FIXED VOLTAGE DEVICE
TCL1584/1585/1587-04 6/6/97
4
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:
∆V
ESR
=
∆I
x ESR
DV
ESL
= 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:
∆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 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
several amps in a time period measured in tens of nanosec-
onds. Load step response requirements are worsened by
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.
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 22µF solid tantalum or a 100µF alumi-
num electrolytic unit will ensure stability over all operating
conditions. Keep in mind that commercially available ca-
pacitors 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 (<1Ω) 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-
TCL1584/1585/1587-04 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 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
5
京公网安备 11010802033920号
EEWORLD
