PJ1261
Dual 5A And 1A Low Dorpout Adjust Fixed Output Regulator
1-3
2003/12.rev.
A
he PJ1261 combines a dual low drop out regulators with
fixed and Adjust output single package with the 3.3V
output having a minimum of 1A and the Adjustable having a
5A output current capability. This product is specifically
designed to provide well regulated supplies for 5V to 3.3V
and adjust it to 5V supplies for the new generation of the
Klamath processor applications.
Hard Disk Drives, CD-ROMs, DVDs
High efficiency linear regulators
Post regulators for switching supplies
ADSL and Cable Modems
Motherboard with multiple supplies
Low dropout voltage
Load regulation : 0.5% typical
On-chip thermal limiting
Fixed 3.3V and Adjustable
T
Device Operating
Temperature
Package
PJ1261CM 0 TO 75 TO-263-5L
FEATURES
TO-263-5L
ORDERING INFORMATION
BLOCK DIAGRAM
APPLICATIONS
Pin
1
.
V1/3.3V
2. GND
3. V
2
4.
ADJ
5. Vin
V
2
=V
ref
(1+R
2
/R
1
)+I
adj
R2
V1
V2
PJ1261
V
IN
V
IN
=6.5V
10F
GND
ADJ
Vref
R1=125
R2=375
3.3V
5V
10F
20F
PJ1261
Dual 5A And 1A Low Dorpout Adjust Fixed Output Regulator
2-3
2003/12.rev.
A
(Operating Conditions: VIN7V, TJ=25 unless otherwise specified.)
The Denotes specifications which apply over the specified operating temperature range of 0 to 125 junction temperature.
Characteristics Symbol
Conditions Min.
Typ.
Max.
Unit
Reference Voltage
V
REF
I
OUT
= 10mA, V
IN
=6.5V 1.225
1.250
1.275
V
Output Voltages
V
OUT
I
OUT
= 10mA, V
IN
=6.5V 3.234
3.300
3.366
V
Line Regulation (both outputs)
REG
LINE
I
OUT
=10mA, 6.V< V
IN
< 7V
-
0.2
0.5
V
IN
=6.3V, I
O1
=1A
Load Regulation (both output)
REG
LOAD
V
IN
=6.3V, I
O2
=5A
0.5 1.0
Time to Output Voltages Valid
-
From V
IN
6V -
5
-
msec
I
O1
=1A
Dropout Voltage
V
D
I
O2
=5A
- 1.2 1.4
V
Current Limit
I
LIMIT
V
IN
=7V , V1
V2
1
5
1.5
6.
- A
Minimum Load Current(Both outputs)
I
LIMIT
6.5V
IN
7V 1.0
-
-
mA
Quiescent Current
I
Q
V
IN
=6.5V -
6
14
mA
Adjust Pin Current
I
ADJ
V
IN
=6.5V -
60
120
A
Ripple Rejection
(both outputs)
RSRR
F=120Hz, C
OUT
=22uf
Tantalum, V
IN
=6.5V, I
OUT
=1A
60 - -
dB
Long-Term Stability
L
S
T
A
=125, 1000hrs
-
0.03
1.0
Ripple Rejection
RSRR
T
A
=25, 10Hzf10kHz 60 2.5 - dB
Thermal Resistance, Junction to case
Q
th
TO-263-5l
-
2
- /W
Thermal Shutdown
-
-
-
155
-
Thermal Shutdown Hysteresis
- Junction
Temperature
- 10 -
Notes:
1. See thermal regulation specifications for changes in output voltage due to heation effects. Load and line regulation are
measured at a constant junction temperature by low duty cycle pulse testing.
2. Power dissipation is determined by input/output differential and the output current. Guaranteed maximum output power will not
be available over the full input/output voltage range.
Parameter Min
Value
Unit
V
IN
-
7
V
Operating Junction Temperature Range
0
150
Storage Temperature Range
-65
150
Lead Temperature(Soldering, 10 sec)
-
300
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISITCS
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