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RC1587M

P1-P3P4-P6P7-P9P10-P12P13-P14
www.fairchildsemi.com
Pentium is a registered trademark of Intel Corporation. REV. 1.5 1/12/01
Features
• Fast transient response
• Low dropout voltage at up to 3A
• Load regulation: 0.05% typical
• Trimmed current limit
• On-chip thermal limiting
• Standard TO-220, TO-263, TO-263 center cut,
and TO-252 packages
Applications
• Pentium
®
Class GTL+ bus supply
• Low voltage logic supply
• Post regulator for switching supply
Description
The RC1587, RC1587-1.5, and RC1587-3.3 are low dropout
three-terminal regulators with 3A output current capability.
These devices have been optimized for low voltage applica-
tions including V
TT
bus termination, where transient response
and minimum input voltage are critical. The RC1587 is ideal
for low voltage microprocessor applications requiring a reg-
ulated output from 1.5V to 3.6V with an input supply of 5V
or less. The RC1587-1.5 offers fixed 1.5V with 3A current
capability for GTL+ bus V
TT
termination. The RC1587-3.3
offers fixed 3.3V current capability for logic IC operation.
Current limit is trimmed to ensure specified output current and
controlled short-circuit current. On-chip thermal limiting pro-
vides protection against any combination of overload and
ambient temperature that would create excessive junction
temperatures.
The RC1587, RC1587-1.5, and RC1587-3.3 are available in
the industry-standard TO-220, TO-263, TO-263 center cut,
and TO-252 (DPAK) power packages.
Typical Applications
V
IN
= 3.3V
10µF
10µF
22µF
124Ω
24.9Ω
22µF
1.5V at 3A
+
+
V
IN
ADJ
V
OUT
RC1587
V
IN
= 3.3V
1.5V at 3A
+
+
V
IN
GND
V
OUT
RC1587-1.5
10µF
22µF
V
IN
= 5V
3.3V at 3A
+
+
V
IN
GND
V
OUT
RC1587-3.3
65-1587-16
RC1587
3A Adjustable/Fixed Low Dropout Linear Regulator
RC1587 PRODUCT SPECIFICATION
2 REV. 1.5
Pin Assignments
Absolute Maximum Ratings
Parameter Min. Max. Unit
V
IN
7V
Operating Junction Temperature Range 0 125 °C
Storage Temperature Range -65 150 °C
Lead Temperature (Soldering, 10 sec.) 300 °C
ADJ
* θ
JA
can vary from 20°C/W to >40°C/W with various mounting techniques.
OUT
FRONT VIEW
3-Lead Plastic TO-220
θ
JC
= 3°C/W
INADJ OUT
FRONT VIEW
3-Lead Plastic TO-263
θ
JC
= 3°C/W*
IN
123
123
GND OUT
FRONT VIEW
IN
123
GND OUT
FRONT VIEW
RC1587MRC1587M-1.5, 3.3
RC1587T-1.5, -3.3VRC1587T
IN
123
ADJ
FRONT VIEW
3-Lead Plastic TO-263 Center Cut
θ
JC
= 3°C/W*
IN
Tab is Out.
123
GND
FRONT VIEW
RC1587MCRC1587MC-1.5, 3.3
IN
123
ADJ
FRONT VIEW
3-Lead Plastic TO-252
θ
JC
= 3°C/W*
IN
Tab is Out.
123
GND
FRONT VIEW
RC1587DRC1587D-1.5, 3.3
IN
12 3
PRODUCT SPECIFICATION RC1587
REV. 1.5 3
Electrical Characteristics
Tj = 25°C unless otherwise specified.
The • denotes specifications which apply over the specified operating temperature range.
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. Line and load regulation are guaranteed up to the maximum power dissipation (18W). Power dissipation is determined by
input/output differential and the output currrent. Guaranteed maximum output power will not be available over the full input/
output voltage range.
3. RC1587 only.
4. RC1587-1.5 only.
5. RC1587-3.3 only.
Parameter Conditions Min. Typ. Max Units
Reference Voltage
3
1.5V ≤ (V
IN
– V
OUT
) ≤ 5.75V,
10mA ≤ I
OUT
≤ 3A
• 1.225
(-2%)
1.250 1.275
(+2%)
V
Output Voltage
4
3.3V ≤ V
IN
≤ 7V
10mA ≤ I
OUT
≤ 3A
• 1.47 1.5 1.53 V
Output Voltage
5
5.1V ≤ V
IN
≤ 7V
10mA ≤ I
OUT
≤ 3A
• 3.234 3.3 3.366 V
Line Regulation
1, 2
(V
OUT
+ 1.5V) ≤ V
IN
≤ 7V,
I
OUT
= 10mA
• 0.005 0.2 %
Load Regulation
1, 2
(V
IN
– V
OUT
) = 3V
10mA ≤ I
OUT
≤ 3A
• 0.05 0.5 %
Dropout Voltage ∆V
REF
= 1%, I
OUT
= 3A • 1.150 1.300 V
Current Limit (V
IN
– V
OUT
) = 2V • 3.1 4 A
Adjust Pin Current
3
• 35 120 µA
Adjust Pin Current Change
3
1.5V ≤ (V
IN
– V
OUT
) ≤ 5.75V,
10mA ≤ I
OUT
≤ 3A
• 0.2 5 µA
Minimum Load Current 1.5V ≤ (V
IN
– V
OUT
) ≤ 5.75V • 10 mA
Quiescent Current V
IN
= 5V • 413mA
Ripple Rejection f = 120Hz, C
OUT
= 22µF Tantalum,
(V
IN
– V
OUT
) = 3V, I
OUT
= 3A
60 72 dB
Thermal Regulation T
A
= 25°C, 30ms pulse 0.004 0.02 %/W
Temperature Stability • 0.5 %
Long-Term Stability T
A
= 125°C, 1000 hrs. 0.03 1.0 %
RMS Output Noise
(% of V
OUT
)
T
A
= 25°C, 10Hz ≤ f ≤ 10kHz 0.003 %
Thermal Resistance,
Junction to Case
TO-220 3 °C/W
TO-263, TO-252 3 °C/W
Thermal Shutdown 150 °C
P1-P3P4-P6P7-P9P10-P12P13-P14

RC1587M

Mfr. #:
Buy RC1587M
Manufacturer:
ON Semiconductor / Fairchild
Description:
LDO Voltage Regulators 3A Low Dropout Lin
Lifecycle:
New from this manufacturer.
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