PT7779鈥?V
32 Amp Programmable Integrated
Switching Regulator
SLTS116
(Revised 8/31/2000)
Description
The PT7779 is a high-output 32A
Integrated Switching Regulator (ISR),
housed in a 27-pin SIP package. The
PT7779 is the next generation of the
industry benchmark PT7771. The
PT7779 includes short circuit pro-
tection and requires only 330碌F of
output capacitance for proper oper-
ation.
The 32A output capability allows
the easy integration of the latest
high-speed, 碌Ps, ASICs, DSPs into
existing 5V systems. For additional
current, the PT7779 is designed to
operate with up to two PT7741
32A compatible current boosters.
The output voltage is programmable
from 1.3V to 3.5V using a 5-bit input,
that is compatible with Intel鈥檚 Pentium
廬
II Processors. A differential remote
sense compensates for any voltage
drop between the ISR and load.
Standard Application
VID0
VID1
VID2
VID3
VID4
V
IN
PROGRAMMING PINS
C in = Required 2400碌F electrolytic
C out = Required 330碌F electrolytic
L1 = Optional 1碌H input choke
Pin-Out Information
Pin Function
1
VID0
2
VID1
3
VID2
4
VID3
5
STBY*- Stand-by
6
VID4
7
V
in
8
V
in
L
O
A
D
REMOTE SENSE(+)
6 4 3 2 1
26
20-25
L1
7-11
V
OUT
1碌H
+
PT7779
27
5
13-19
12
C
IN
SYNC OUT
GND
STBY*
+
C
OUT
GND
REMOTE SENSE(鈥?
9
10
11
12
13
14
V
in
V
in
V
in
Remote Sense Gnd
(3)
GND
GND
Pin Function
15
GND
16
GND
17
GND
18
GND
19
GND
20
V
out
21
V
out
22
V
out
23
V
out
24
V
out
25
V
out
26
Remote Sense V
out
27
Sync Out
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 Tolerance
Line Regulation
Load Regulation
V
o
Ripple/Noise pk-pk
Transient Response
with C
out
= 330碌F
Efficiency
Switching Frequency
Absolute Maximum
Operating Temperature Range
Storage Temperature
Mechanical Vibration
Weight
鈥?/div>
PT7779
Symbols
I
o
V
in
鈭哣
o
Reg
line
Reg
load
V
n
t
tr
V
os
畏
茠
o
T
a
T
s
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>
32A
V
in
= +5V, I
o
= 32A
鈥?0擄C
鈮?/div>
T
a
鈮?/div>
+85擄C
4.5V
鈮?/div>
V
in
鈮?/div>
5.5V, I
o
= 32A
V
in
= +5V, 0.1
鈮?/div>
I
o
鈮?/div>
32A
V
in
= +5V, I
o
= 32A
I
o
step between 16A and 32A
V
o
over/undershoot
V
in
= +5V, I
o
= 20A, V
o
= 3.3V
4.5V
鈮?/div>
V
in
鈮?/div>
5.5V
0.1A
鈮?/div>
I
o
鈮?/div>
32A
Over V
in
Range
鈥?/div>
Per Mil-STD-883D, Method 2007.2,
20-20,000Hz, Soldered in a PC board
Vertical/Horizontal
Min
0.1
0.1
4.5
V
o
-0.03
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
300
鈥?0
-40
鈥?/div>
鈥?/div>
(1)
(1)
Typ
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鹵10
鹵10
50
100
200
90
350
鈥?/div>
鈥?/div>
10/15
53/66
Max
31
32
5.5
V
o
+0.03
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
400
+85
(2)
Units
A
V
V
mV
mV
mV
碌Sec
mV
%
kHz
擄C
擄C
G鈥檚
grams
+125
鈥?/div>
鈥?/div>
Notes:
(1) ISR-will operate down to no load with reduced specifications.
(2) Consult the Safe Operating Area curves, or contact the factory for the appropriate derating.
(3) If the remote sense ground is not used, pin 12 must be connected to pin13 for optimum output voltage accuracy.
External Capacitors:
The PT7779 requires a minimum output capacitance of 330碌F for proper operation. The PT7779 also requires an input capacitance of 2400碌F,
which must be rated for a minimum of 2.0Arms of ripple current. For transient or dynamic load applications, additional capacitance may be required. For further infor-
mation, see the accompanying application note on capacitor selection for this product.
Input Filter:
An input filter inductor is optional for most applications. The input inductor must be sized to handle 32ADC 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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