Next Generation 鈥淏ig Hammer鈥?/div>
SLTS084
(Revised 6/30/2000)
Description
The PT7709 is a next generation
鈥淏ig Hammer鈥? high-performance
Integrated Switching Regulator (ISR),
which is made available in Power
Trends鈥?aluminum 27-pin SIP pack-
age. The PT7709 improves on the
popular PT7705 with 20A of output
current and short circuit protection.
The PT7709 is suitable for exist-
ing 5V system designs that require
power for the latest high-speed, low-
voltage 碌Ps, and bus drivers.
The PT7709 output is program-
mable from 1.3V to 3.5V with a 5-bit
input, which is compatible with the
Intel Pentium
廬
Processor. A differential
remote sense is also provided to com-
pensate for voltage drop between the
ISR and load.
Only 330碌F of output capacitance
are required for proper operation.
Pin-Out Information
Standard Application
PROGRAMMING PINS
VID0
VID1
VID2
VID3
VID4
L1
1 H
+
STBY
Pin Function
1
REMOTE SENSE (+)
Pin Function
10
11
12
13
14
15
16
17
18
V
in
V
in
Remote Sense Gnd
(4)
Pin Function
19
20
21
22
23
24
25
26
27
GND
V
out
V
out
V
out
V
out
V
out
V
out
Remote Sense V
out
VID0
VID1
VID2
VID3
STBY* - Stand-by
2
3
4
5
LOAD
6
4
3
2
1
26
SNS(+)
VID4 - VID0
V
IN
7-11
Vin
PT7709
Synch
Out
GND
SNS(-)
Vo
20-25
V
OUT
GND
GND
GND
GND
GND
GND
SYNC OUT
GND
STBY*
C
IN
5
27
13-19
12
+
C
OUT
GND
REMOTE SENSE ( )
6
7
8
9
VID4
V
in
V
in
V
in
Sync Out
Cin = Required 1500碌F electrolytic
Cout= Required 330碌F electrolytic
L1 = Optional 1碌H input choke
For STBY* pin:
open = output enabled
ground = output disabled.
Specifications
Characteristics
(T
a
= 25擄C unless noted)
Output Current
Input Voltage Range
Output Voltage T
olerance
Line Regulation
Load Regulation
V
o
Ripple/Noise
Transient Response
with C
out
= 330碌F
Efficiency
PT7709 SERIES
Symbols
I
o
V
in
鈭哣
o
Reg
line
Reg
load
V
n
t
tr
V
os
畏
Conditions
T
a
= +60擄C, 200 LFM, pkg N
T
a
= +25擄C, natural convection
0.1A
鈮?/div>
I
o
鈮?/div>
20A
V
in
= +5V, I
o
= 20A
0擄C
鈮?/div>
T
a
鈮?/div>
+65擄C
4.5V
鈮?/div>
V
in
鈮?/div>
5.5V, I
o
= 20A
V
in
= +5V, 0.1
鈮?/div>
I
o
鈮?/div>
20A
V
in
= +5V, I
o
= 20A
I
o
step between 10A and 20A
V
o
over/undershoot
V
in
= +5V, I
o
= 10A
V
in
= +5V, I
o
= 20A
V
o
= 3.3V
V
o
= 2.5V
V
o
= 1.8V
V
o
= 3.3V
V
o
= 2.5V
V
o
= 1.8V
Min
0.1
(1)
0.1
(1)
4.5
V
o
-0.03
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
300
鈥?0
鈥?0
鈥?/div>
鈥?/div>
鈥?/div>
(2)
Typ
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鹵10
鹵10
50
50
100
92
90
87
90
87
82
350
鈥?/div>
鈥?/div>
500
10
31/41
Max
20
20
5.5
V
o
+0.03
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
400
+85
(3)
+125
鈥?/div>
鈥?/div>
鈥?/div>
Units
A
A
V
V
mV
mV
mV
碌Sec
mV
%
%
%
%
%
%
kHz
擄C
擄C
G鈥檚
G鈥檚
grams
Switching Frequency
Absolute Maximum
Operating T
emperature Range
Storage T
emperature
Mechanical Shock
Mechanical Vibration
Weight
茠
o
T
a
T
s
4.5V
鈮?/div>
V
in
鈮?/div>
5.5V
0.1A
鈮?/div>
I
o
鈮?/div>
20A
Over V
in
鈥?/div>
Per Mil-STD-883D, Method 2002.3
1 msec, Half Sine, mounted to a fixture
Per Mil-STD-883D, Method 2007.2,
20-2000 Hz, Soldered in a PC board
and
I
o
Ranges
鈥?/div>
Vertical/Horizontal
Notes:
(1)
(2)
(3)
(4)
ISR-will operate down to no load with reduced specifications.
For operation below 0擄C, Cin and Cout must have stable characteristics. Use either low ESR tantalum or Oscon廬 capacitors.
See Safe Operating Area curves or contact the factory for the appropriate derating.
If the Remote Sense Ground is not used, pin 12 must be connected to pin 13 for optimum output voltage accuracy.
External Capacitors:
The PT7709 requires a minimum output capacitance of 330碌F for proper operation. The PT7709 also requires an input capacitance of 1500碌F,
which must be rated for a minimum of 1.4Arms of ripple current. For transient or dynamic load applications, additional capacitance may be required. For more
information refer to the application note regarding capacitor selection for this product.
Input Filter:
An input filter inductor is optional for most applications. The inductor must be sized to handle 20ADC with a typical value of 1碌H.
For technical support and more information, see inside back cover or visit www.ti.com/powertrends
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