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 performance +3.1 to 6V input, 8 Amp, 14-Pin
SIP (Single In-line-Package) Inte-
Pin-Out Information
Pin
Standard Application
V oA D J
V oS E N S E
14
VIN
4,5,6
+
1
PT6500
3
C1
STBY
VO U T
11,12,13
+
7,8,9,10
C2
LOAD
Q1
COM
COM
C1 = Required 330µF electrolytic *
C2 = Required 330µF electrolytic *
* See footnotes
1
2
3
4
5
6
7
8
9
10
11
12
13
14
Function
Remote Sense
Do not connect
STBY*-Standby
V in
V in
V in
GND
GND
GND
GND
Vout
Vout
Vout
V out Adjust
Ordering Information
PT6501!
† PT6502!
PT6503!
PT6504!
† PT6505!
† PT6506!
† PT6507!
† PT6508!
= 3.3 Volts
= 1.5 Volts
= 2.5 Volts
= 3.6 Volts
= 1.2 Volts
= 1.8 Volts
= 1.3 Volts
= 1.7 Volts
grated Switching Regulator (ISR).
This ISR allows the integration of
high-speed, low-voltage Pentium processors 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.
PT Series Suffix (PT1234X)
Case/Pin
Configuration
Heat Tab Configuration
None
Side
Vertical Through-Hole
Horizontal Through-Hole
Horizontal Surface Mount
N
A
C
R
G
B
Pkg Style 400
†3.3V Input Bus Capable
Specifications
PT6500 SERIES
Characteristics
(Ta=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
4.5
3.1
4.8
—
—
—
6
6
6
V
Output Voltage Tolerance
∆Vo
Vin = +5V, Io = 8.0A
Ta = 0 to +70°C
Vo-0.1
—
Vo+0.1
V
Line Regulation
Regline
4.5V ≤ Vin ≤ 6.0V, Io = 8.0A
3.1V ≤ Vin ≤ 6.0V, Io = 8.0A
4.5V ≤ Vin ≤ 6.0V, Io = 8.0A
Vo ≥3.3V
Vo ≤1.8V
Vo =2.5V
—
—
±7
±3
±7
±17
±8
±13
mV
Load Regulation
Regload
0.1 ≤ Io ≤ 8.0A, Vin = +5V
Vo ≥3.3V
Vo ≤1.8V
Vo =2.5V
—
—
±17
±12
±13
±33
±23
±25
mV
Vo Ripple/Noise
Vn
ttr
Vos
Vin = +5V, Io = 8.0 Amp
—
50
—
mVpp
Transient Response
with Co = 330µF
Io step from 4A to 8.0A
Vo over/undershoot
—
—
100
150
—
—
µsec
mV
Efficiency
η
Vin = +5V, Io = 3.0A
Vo ≥3.3V
Vo =2.5V
Vo =1.8V
Vo =1.5V
Vo =1.2V
—
—
—
—
—
90
85
78
76
67
—
—
—
—
—
%
Vo ≥3.3V
Vo =2.5V
Vo =1.8V
Vo =1.5V
Vo =1.2V
—
—
—
—
—
83
76
74
68
65
—
—
—
—
—
%
600
725
kHz
—
+85 (4)
°C
15
—
Vo=2.5V and 3.3V
Vo≤1.8V
Vo=3.6V
Vin = +5V, Io = 8.0A
Switching Frequency
ƒo
Absolute Maximum
Operating Temperature Range
Ta
Thermal Resistance
θja
Over Vin and Io ranges
475
–40
Free Air Convection (40-60LFM)
—
(3)
°C/W
Continued
For technical support and more information, see inside back cover or visit www.ti.com/powertrends
PT6500 Series
8 Amp 5V/3.3V Input Adjustable ISR
with Short-Circuit Protection
Specifications (continued)
PT6500 SERIES
Characteristics
(Ta=25°C unless noted)
Symbols
Conditions
Min
Typ
Max
Units
Storage Temperature
Ts
—
-40
—
+125
°C
Mechanical Shock
Per Mil-STD-883D, Method 2002.3,
1msec, half sine, fixture mounted
—
500
—
G’s
Mechanical Vibration
Per Mil-STD-883D, Methode 2007.2,
20-20,000 Hz, soldered ina PC board
—
7.5
—
G’s
—
23
—
grams
Weight
(1) ISR will operate down to no load with reduced specifications.
(2) The minimum input voltage required by the part is Vout +1.2V or 3.1V, whichever is greater.
(3) For operation below 0°C, use tantalum capacitors. For more information see the related applicatoin note, “PT6000/7000 Series Capacitor
Recommendations.”
(4) See Thermal Derating charts.
Notes:
Input/Output Capacitors: The PT6500 series requires a 330µF electrolytic or tantalum input and output capacitor for proper operation in all applications. C 1 (input)
must be rated for 1.2Arms and 100mΩ max. ESR. C2 (output) must must be rated for 400mArms ripple current and 0.2 Ω max. ESR.
T Y P I C A L
PT6502, 1.5 VDC, Vin =5.0V
PT6503, 2.5 VDC, Vin =5.0V
(See Note A)
(See Note A)
(See Note A)
Efficiency vs Output Current
Efficiency vs Output Current
Efficiency vs Output Current
100
100
90
90
4.5V
70
5.0V
5.5V
60
90
Vin
Vin
80
3.1V
3.5V
4.0V
4.5V
5.0V
6.0V
70
60
6.0V
80
1
2
3
4
5
Iout-(Amps)
6
7
5.0V
5.5V
6.0V
50
40
0
8
4.5V
60
40
0
4.0V
70
50
40
1
2
3
4
5
6
7
8
0
1
2
3
Ripple vs Output Current
35
40
20
5.0V
15
4.5V
10
3.1V
3.5V
4.0V
4.5V
5.0V
6.0V
30
20
8
Vin
40
6.0V
5.5V
30
5.0V
20
4.5V
4.0V
10
10
5
7
50
Vin
Ripple-(mV)
5.5V
Ripple-(mV)
6.0V
6
60
50
25
5
Ripple vs Output Current
Vin
30
4
Iout-(Amps)
Iout-(Amps)
Ripple vs Output Current
0
0
0
0
1
2
3
4
5
6
7
8
0
0
Iout-(Amps)
2
1
3
4
5
6
7
4
5.5V
3
5.0V
2
4.5V
Pd-(Watts)
6.0V
6.0V
5.0V
4.5V
4.0V
3.5V
3.1V
4
3
2
2
3
4
5
Iout-(Amps)
6
7
8
7
8
Vin
5
6.0V
4
5.5V
3
5.0V
4.5V
4.0V
1
0
0
0
6
2
1
1
5
6
Vin
5
Vin
5
4
7
Pd-(Watts)
6
3
Power Dissipation vs Output Current
6
1
2
Iout-(Amps)
Power Dissipation vs Output Current
7
0
1
8
Iout-(Amps)
Power Dissipation vs Output Current
Pd-(Watts)
100
Efficiency-%
Vin
80
Efficiency-%
Efficiency-%
PT6501, 3.3 VDC, Vin =5.0V
50
Ripple-(mV)
C H A R A C T E R I S T I C S
0
1
2
3
4
5
Iout-(Amps)
6
7
8
0
1
2
3
4
5
6
7
8
Iout-(Amps)
Note A: All data listed in the above graphs has been developed from actual products tested at 25°C. This data is considered typical data for the ISR.
For technical support and more information, see inside back cover or visit www.ti.com/powertrends
Thermal Data
PT6500 Series
THERMAL DERATING CURVES
Air Flow (LFM)
60
200
300
PT6501
No Heat Tab
25˚C
70˚C
6
Iout-(Amps)
6
85˚C
5
4
3
1
0
0
5.25
5.5
5.75
7
85˚C
6
3
1
5
70˚C
4
2
4.75
8
5
2
4.5
35˚C
50˚C
7
60˚C
Thermal Derating (Ta)
(See Note B)
8
35˚C
50˚C
7
Iout-(Amps)
Thermal Derating (Ta)
(See Note B)
8
Iout-(Amps)
Thermal Derating (Ta)
60˚C
85˚C
5
4
3
2
1
0
4.5
6
(See Note B)
70˚C
4.75
5
5.25
5.5
5.75
6
4.5
4.75
5
Vin-(Volts)
Vin-(Volts)
5.25
5.5
5.75
6
Vin-(Volts)
Heat Tab
Thermal Derating (Ta)
50˚C
4
3
2
5
4
3
2
1
1
0
0
4.5
4.75
5
5.25
Vin-(Volts)
5.5
5.75
6
6
Iout-(Amps)
Iout-(Amps)
5
85˚C
7
6
(See Note B)
70˚C
8
85˚C
7
85˚C
6
Thermal Derating (Ta)
(See Note B)
70˚C
8
60˚C
70˚C
7
Iout-(Amps)
Thermal Derating (Ta)
(See Note B)
8
5
4
3
2
1
0
4.5
4.75
5
5.25
Vin-(Volts)
5.5
5.75
4.5
6
4.75
5
5.25
5.5
Vin-(Volts)
5.75
6
PT6502
No Heat Tab
85˚C
5
4
3
5
4
3
5
4
3
2
1
1
1
0
0
4
4.5
Vin-(Volts)
5
5.5
0
3
6
85˚C
6
2
3.5
70˚C
7
2
3
(See Note B)
8
85˚C
6
Iout-(Amps)
Iout-(Amps)
50˚C
60˚C
70˚C
7
70˚C
6
Thermal Derating (Ta)
(See Note B)
8
50˚C
60˚C
7
Thermal Derating (Ta)
(See Note B)
8
Iout-(Amps)
Thermal Derating (Ta)
3.5
4
4.5
Vin-(Volts)
5
5.5
3
6
3.5
4
4.5
Vin-(Volts)
5
5.5
6
Heat Tab
50˚C
Iout-(Amps)
6
5
4
3
5
4
3
1
0
0
4
4.5
Vin-(Volts)
5
5.5
6
70˚C
85˚C
7
6
1
3.5
85˚C
5
2
(See Note B)
8
6
2
3
Thermal Derating (Ta)
70˚C
7
85˚C
(See Note B)
8
60˚C
70˚C
7
Iout-(Amps)
Thermal Derating (Ta)
(See Note B)
8
Iout-(Amps)
Thermal Derating (Ta)
4
3
2
1
0
3
3.5
4
4.5
Vin-(Volts)
5
5.5
6
3
3.5
4
4.5
Vin-(Volts)
5
Note B: Thermal derating graphs are developed in different air flow rates as indicated on each graph, with or without the heat tab, soldered in a printed circuit board.
For technical support and more information, see inside back cover or visit www.ti.com/powertrends
5.5
6
Thermal Data
PT6500 Series
THERMAL DERATING CURVES
Air Flow (LFM)
60
200
300
PT6503
No Heat Tab
8
70˚C
7
Iout-(Amps)
70˚C
6
85˚C
5
Thermal Derating (Ta)
(See Note B)
8
50˚C
60˚C
7
Iout-(Amps)
Thermal Derating (Ta)
(See Note B)
6
5
6
5
4
4
3
3
3
2
2
2
1
1
1
0
0
5
5.5
6
70˚C
85˚C
7
4
4.5
(See Note B)
8
85˚C
Iout-(Amps)
Thermal Derating (Ta)
0
4.5
4.75
5
Vin-(Volts)
5.25
Vin-(Volts)
5.5
5.75
6
4.5
4.75
5
5.25
Vin-(Volts)
5.5
5.75
6
Heat Tab
Thermal Derating (Ta)
Thermal Derating (Ta)
(See Note B)
50˚C
8
(See Note B)
Thermal Derating (Ta)
70˚C
8
70˚C
8
85˚C
60˚C
7
85˚C
6
5
85˚C
Iout-(Amps)
70˚C
Iout-(Amps)
Iout-(Amps)
7
6
5
4
4
7
6
5
4
3
3
3
2
2
2
1
1
1
0
0
0
4.5
4.75
5
5.25
Vin-(Volts)
5.5
5.75
6
(See Note B)
4.5
4.75
5
5.25
5.5
Vin-(Volts)
5.75
6
4.5
4.75
5
5.25
5.5
Vin-(Volts)
5.75
6
Note B: Thermal derating graphs are developed in different air flow rates as indicated on each graph, with or without the heat tab, soldered in a printed circuit board.
For technical support and more information, see inside back cover or visit www.ti.com/powertrends
Application Notes
PT6500 Series
Adjusting the Output Voltage of the
PT6500 5V/3.3V Bus Converters
Figure 1
The output voltage of the Power Trends PT6500 Series
ISRs may be adjusted higher or lower than the factory
trimmed pre-set voltage with the addition of a single
external resistor. Table 1 accordingly gives the allowable
adjustment range for each model in the series as Va (min)
and Va (max).
1
V o (sense)
4,5,6
Vin
PT6500
V in
STBY
3
GND
11,12,13
V out
Vo
V o(adj)
7,8,9,10
14
(R1)
Adj Down
+
L
O
A
D
+
C1
C2
Adjust Up:
An increase in the output voltage is
obtained by adding a resistor R2, between pin 14 (Vo adjust) and pins 7-10 (GND).
R2
Adjust
Up
COM
COM
Adjust Down:
Add a resistor (R1), between pin 14 (Vo
adjust) and pins 11-13 (Vout).
The values of (R1) [adjust down], and R2 [adjust up], can
also be calculated using the following formulae.
Refer to Figure 1 and Table 2 for both the placement and value
of the required resistor, either (R1) or R2 as appropriate.
Notes:
1. Use only a single 1% resistor in either the (R1) or R2
location. Place the resistor as close to the ISR as
possible.
2. Never connect capacitors from Vo adjust to either
GND, Vout, or the Remote Sense pin. Any
capacitance added to the Vo adjust pin will affect the
stability of the ISR.
3. If the Remote Sense feature is being used,
connecting the resistor (R1) between pin 14 (Vo
adjust) and pin 1 (Remote Sense) can benefit load
regulation.
4. The minimum input voltage required by the part is
Vout + 1.2 or Vin(min) from Table 1, whichever is
higher.
(R1)
=
R2
=
Where: Vo
Va
Ro
Rs
Ro (Va – 1.0)
(Vo – Va)
Ro
Va - Vo
– Rs kΩ
kΩ
– Rs
= Original output voltage
= Adjusted output voltage
= The resistance value in Table 1
= The series resistance from Table 1
Table 1
PT6500 ADJUSTMENT AND FORMULA PARAMETERS
Series Pt #
PT6505
PT6507
PT6502
PT6508
PT6506
PT6503
PT6501
PT6504
Vo (nom)
Va (min)
1.2
1.3
1.5
1.7
1.8
2.5
3.3
3.6
1.14
1.19
1.27
1.36
1.4
1.8
2.25
2.5
Va (max)
Ω)
Ro (kΩ
2.35
2.45
2.65
2.85
2.95
3.5
4.2
4.3
2.49
2.49
2.49
2.49
2.49
4.99
12.1
10.0
2.0
2.0
2.0
2.0
2.0
4.22
12.1
12.1
3.1
3.1
3.1
3.1
3.1
4.5
4.5
4.5
Ω)
Rs (kΩ
Vin(min)
For technical support and more information, see inside back cover or visit www.ti.com/powertrends
Application Notes continued
PT6500 Series
Table 2
PT6500 ADJUSTMENT RESISTOR VALUES
Series Pt #
Vo (nom)
Va (req’d)
1.15
PT6505
1.2
PT6507
1.3
PT6502
1.5
PT6508
1.7
PT6506
1.8
PT6503
2.5
PT6501
3.3
PT6504
3.6
(5.5)kΩ
1.2
(3.0)kΩ
1.25
47.8kΩ
(10.5)kΩ
1.3
22.9kΩ
1.35
14.6kΩ
47.8kΩ
1.4
10.5kΩ
22.9kΩ
(8.0)kΩ
(1.3)kΩ
(0.5)kΩ
1.45
8.0kΩ
14.6kΩ
(20.4)kΩ
(2.5)kΩ
(1.2)kΩ
1.5
6.3kΩ
10.5kΩ
(4.2)kΩ
(2.2)kΩ
1.55
5.1kΩ
8.0kΩ
47.8kΩ
(7.1)kΩ
(3.5)kΩ
1.6
4.2kΩ
6.3kΩ
22.9kΩ
(12.9)kΩ
(5.5)kΩ
1.65
3.5kΩ
4.1kΩ
14.6kΩ
(30.4)kΩ
1.7
3.0kΩ
4.2kΩ
10.5kΩ
1.75
2.5kΩ
3.5kΩ
8.0kΩ
47.8kΩ
1.8
2.2kΩ
3.0kΩ
6.3kΩ
22.9kΩ
1.85
1.8kΩ
2.5kΩ
5.1kΩ
14.6kΩ
47.8kΩ
(2.3)kΩ
1.9
1.6kΩ
2.2kΩ
4.2kΩ
10.5kΩ
22.9kΩ
(3.3)kΩ
1.95
1.3kΩ
1.8kΩ
3.5kΩ
8.0kΩ
14.6kΩ
(4.4)kΩ
2.0
1.1kΩ
1.6kΩ
3.0kΩ
6.3kΩ
10.5kΩ
(5.8)kΩ
2.05
0.9kΩ
1.3kΩ
2.5kΩ
5.1kΩ
8.0kΩ
(7.4)kΩ
2.1
0.8kΩ
1.1kΩ
2.2kΩ
4.2kΩ
6.3kΩ
(9.5)kΩ
2.15
0.6kΩ
0.9kΩ
1.8kΩ
3.5kΩ
5.1kΩ
(12.2)kΩ
2.2
0.5kΩ
0.8kΩ
1.6kΩ
3.0kΩ
4.2kΩ
(15.7)kΩ
2.25
0.4kΩ
0.6kΩ
1.3kΩ
2.5kΩ
3.5kΩ
(20.7)kΩ
(2.3)kΩ
2.3
0.3kΩ
0.5kΩ
1.1kΩ
2.2kΩ
3.0kΩ
(28.2)kΩ
(3.6)kΩ
2.35
0.2kΩ
0.4kΩ
0.9kΩ
1.8kΩ
2.5kΩ
(40.7)kΩ
(5.1)kΩ
2.4
0.3kΩ
0.8kΩ
1.6kΩ
2.2kΩ
(65.6)kΩ
(6.7)kΩ
2.45
0.2kΩ
(140.0)kΩ
(1.7)kΩ
(3.8)kΩ
(8.8)kΩ
(15.4)kΩ
(35.4)kΩ
(1.5)kΩ
0.6kΩ
1.3kΩ
1.8kΩ
2.5
0.5kΩ
1.1kΩ
1.6kΩ
2.55
0.4kΩ
0.9kΩ
1.3kΩ
2.6
0.3kΩ
0.8kΩ
2.65
0.2kΩ
(8.5)kΩ
(10.6)kΩ
(1.5)kΩ
95.6kΩ
(12.9)kΩ
(2.7)kΩ
1.1kΩ
45.7kΩ
(15.6)kΩ
(3.9)kΩ
0.6kΩ
6.9kΩ
29.0kΩ
(18.6)kΩ
(5.3)kΩ
0.5kΩ
0.8kΩ
20.7kΩ
(22.2)kΩ
(6.8)kΩ
2.75
0.4kΩ
0.6kΩ
15.7kΩ
(26.4)kΩ
(8.5)kΩ
2.8
0.3kΩ
0.5kΩ
12.4kΩ
(31.5)kΩ
(10.4)kΩ
2.85
0.2kΩ
2.7
0.4kΩ
10.0kΩ
(37.6)kΩ
(12.6)kΩ
2.9
0.3kΩ
8.3kΩ
(45.4)kΩ
(15.0)kΩ
2.95
0.2kΩ
0.9kΩ
(55.3)kΩ
(17.9)kΩ
3.0
5.8kΩ
(68.6)kΩ
(21.2)kΩ
3.1
4.1kΩ
(115.0)kΩ
(29.9)kΩ
3.2
2.9kΩ
(254.0)kΩ
(42.9)kΩ
3.3
2.0kΩ
3.4
1.3kΩ
109.0kΩ
(108.0)kΩ
3.5
0.8kΩ
48.4kΩ
(238.0)kΩ
(64.6)kΩ
3.6
28.2kΩ
3.7
18.2kΩ
87.9kΩ
3.8
12.1kΩ
37.9kΩ
3.9
4/. V out >3.8Vdc requires V in >5.0Vdc !
8.1kΩ
21.2kΩ
4.0
5.2kΩ
12.9kΩ
4.1
3.0kΩ
7.9kΩ
4.2
1.3kΩ
4.6kΩ
4.3
R1 = (Blue)
2.2kΩ
R2 = Black
For technical support and more information, see inside back cover or visit www.ti.com/powertrends
Application Notes
PT6500 Series
Using the Standby Function on the
PT6500 5V/3.3V Bus Converters
Figure 1
1
For applications requiring output voltage On/Off control,
the 14-pin PT6500 ISR series incorporates a standby
function. This function may be used in applications that
require power-up/shutdown sequencing, and wherever
there is a requirement for the output status of the module
to be controlled by external circuitry.
Vo(sense)
4,5,6
V in
PT6500
Vin
GND
STBY
+
Vo
Vo
Vo(adj)
7,8,9,10
3
11,12,13
+
14
C in
Cout
COM
The standby function is provided by the STBY* control,
pin 3. If pin 3 is left open-circuit the regulator operates
normally, and provides a regulated output when a valid
supply voltage is applied to Vin (pins 4, 5, & 6) with respect to GND (pins 7-10). If a low voltage2 is then
applied to pin-3 the regulator output will be disabled and
the input current drawn by the ISR will drop to less than
50mA4. The standby control may also be used to hold-off
the regulator output during the period that input power is
applied.
The standby control pin is ideally controlled using an
open-collector (or open-drain) discrete transistor (See
Figure 1). It may also be driven directly from a dedicated
TTL3 compatible gate. Table 1 provides details of the
threshold requirements.
Table 1 Inhibit Control Thresholds (2,3)
Parameter
Min
Max
Enable (VIH)
Disable (VIL)
1V
–0.1V
5V
0.35V
Notes:
1. The Standby/Inhibit control logic is similar for all Power
Trends’ modules, but the flexibility and threshold
tolerances will be different. For specific information on
this function for other regulator models, consult the
applicable application note.
2. The Standby control pin is ideally controlled using an
open-collector (or open-drain) discrete transistor and
requires no external pull-up resistor. The control input has
an open-circuit voltage of about 1Vdc. To disable the
regulator output, the control pin must be pulled to less
than 0.35Vdc with a low-level 0.5mA sink to ground.
3. The Standby input on the PT6500 series may be driven by
a differential output device, making it compatible with
TTL logic. A standard TTL logic gate will meet the
0.35V VIL(max) requirement (Table 1 ) at 0.5mA IOL.
Do not use devices that can drive the Standby control input
above 5Vdc.
4. When the regulator output is disabled the current drawn
from the input source is reduced to approximately 30–
40mA (50mA maximum).
COM
Q1
BSS138
Inhibit
+5V V in
Turn-On Time: In the circuit of Figure 1, turning Q1 on applies a
low voltage to the Standby control (pin 3) and disables the
regulator ouput. Correspondingly, turning Q1 off releases the
low-voltage signal and enables the output. The PT6500 ISR
series regulators have a fast response and will provide a fully
regulated output voltage within 250 µsec. The actual turn-on
time will vary with load and the total amount of output capacitance. The waveform of Figure 2 shows the typical output
voltage response of a PT6501 (3.3V) following the turn-off of
Q1 at time t = 0.0 secs. The waveform was measured with a
5Vdc input voltage, and 0.6Ω load.
Figure 2
Vo (2V / Div)
-50
0
For technical support and more information, see inside back cover or visit www.ti.com/powertrends
50
100
150
t ( µs )
200
250
300
350
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