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PT6500 Series
8 Amp 5V/3.3V Input Adjustable ISR
with Short-Circuit Protection
SLTS034A
(Revised 8/23/2000)
8A Single Device Power
Up to 90% efficiency (PT6501)
Small SIP Footprint
Standby Function
Internal Short Circuit Protection
Over-Temperature Protection
Adjustable Output Voltage
The PT6500 series is a high perfor-
mance +3.1 to 6V input, 8 Amp, 14-Pin
SIP (Single In-line-Package) Inte-
grated Switching Regulator (ISR).
This ISR allows the integration of
high-speed, low-voltage Pentium pro-
cessors and their support logic into
existing 3.3V or 5V systems without
redesigning the central power supply.
The PT6502 (1.5V) provides the low
terminating voltages required by BTL/
Futurebus+, CTT, HP, and GTL Buses
from existing 3.3V or 5V power rails.
Ordering Information
PT6501! = 3.3 Volts
PT6502! = 1.5 Volts
PT6503! = 2.5 Volts
PT6504! = 3.6 Volts
PT6505! = 1.2 Volts
PT6506! = 1.8 Volts
PT6507! = 1.3 Volts
PT6508! = 1.7 Volts
PT Series Suffix (PT1234X)
Case/Pin
Heat Tab Configuration
Configuration
None
Side
Vertical Through-Hole
NR
Horizontal Through-Hole
AG
Horizontal Surface Mount
CB
Standard Application
C1 = Required 330F electrolytic *
C2 = Required 330F electrolytic *
* See footnotes
PT6500
11,12,13
14
7,8,9,10
4,5,6
3
1
C
2
+
C
1
+
LOAD
V
oADJ
V
IN
STBY
COM
V
OUT
COM
V
o SENSE
Q1
Pin-Out Information
Pin
Function
1
Remote Sense
2
Do not connect
3
STBY*-Standby
4Vin
5Vin
6Vin
7
GND
8
GND
9
GND
10
GND
11
Vout
12
Vout
13
Vout
14
Vout Adjust
Pkg Style 400
3.3V Input Bus Capable
Specifications
Characteristics
PT6500 SERIES
(T
a=25
°C unless noted)
Symbols
Conditions
Min
Typ
Max
Units
Output Current
Io
Over Vin range
0.1 (1)
—
8.0
A
Current Limit
Icl
Vin=+5V
—
13.0
20.0
A
Short Circuit Current
Isc
Vin=+5V
—
15.0
—
Apk
Input Voltage Range
Vin
0.1
≤ Io≤ 8.0A
Vo=2.5V and 3.3V
4.5
—
6
Vo≤1.8V
3.1
—
6
V
Vo=3.6V
4.8
—
6
Output Voltage Tolerance
Vo
Vin = +5V, Io = 8.0A
Vo-0.1
—
Vo+0.1
V
Ta = 0 to +70°C
Line Regulation
Regline
4.5V
≤ Vin ≤ 6.0V, Io = 8.0A
Vo ≥3.3V
—
±7
±17
3.1V
≤ Vin ≤ 6.0V, Io = 8.0A
Vo ≤1.8V
—
±3
±8
mV
4.5V
≤ Vin ≤ 6.0V, Io = 8.0A
Vo =2.5V
±7
±13
Load Regulation
Regload
0.1
≤ Io ≤ 8.0A, Vin = +5V
Vo ≥3.3V
—
±17
±33
Vo ≤1.8V
—
±12
±23
mV
Vo =2.5V
±13
±25
Vo Ripple/Noise
Vn
Vin = +5V, Io = 8.0 Amp
—
50
—
mVpp
Transient Response
ttr
Io step from 4A to 8.0A
—
100
—
sec
with Co = 330F
Vos
Vo over/undershoot
—
150
—
mV
Efficiency
η
Vin = +5V, Io = 3.0A
Vo ≥3.3V
—
90
—
Vo =2.5V
—
85
—
Vo =1.8V
—
78
—
%
Vo =1.5V
—
76
—
Vo =1.2V
—
67
—
Vin = +5V, Io = 8.0A
Vo ≥3.3V
—
83
—
Vo =2.5V
—
76
—
Vo =1.8V
—
74
—
%
Vo =1.5V
—
68
—
Vo =1.2V
—
65
—
Switching Frequency
o
Over Vin and Io ranges
475
600
725
kHz
Absolute Maximum
Ta
–40 (3)
—+85 (4)
°C
Operating Temperature Range
Thermal Resistance
θ
ja
Free Air Convection (40-60LFM)
—
15
—
°C/W
Continued