For assistance or to order, call
(800) 531-5782
PT7772
Series
32 AMP HIGH-PERFORMANCE
鈥淪LEDGE HAMMER鈥?PROGRAMMABLE ISR
Revised 7/15/98
The PT7772 is a new series of
high-performance, 32 Amp Integrated
Switching Regulators (ISRs) housed in
a 27-pin SIP package. The 32A capa-
bility allows easy
integration of the latest high-speed,
low-voltage 碌Ps, ASICs, DSPs, and
bus drivers into existing 3.3V systems.
The output voltage of the PT7772
can be easily programmed from 1.3V
to 2.05V with a 4-bit input compatible
with Intel鈥檚 Pentium
廬
Pro Processor. A
differential remote sense is also pro-
vided which automatically compensates
for any voltage drop from the ISR
to the load.
2400碌F of output capacitance
are required for proper operation.
Pin-Out Information
Standard Application
PROGRAMMING PINS
VID0
VID1
VID2
VID3
4 3 2 1
26
REMOTE SENSE (+)
V
IN
L1
7 - 11
1碌H
+
27
PT7772
13 - 19
5
12
20 - 25
V
OUT
C
IN
SYNC OUT
GND
STBY*
C
OUT
+
LOAD
GND
REMOTE SENSE (-)
Pin Function
1
VID0
2
VID1
3
VID2
4
VID3
5
STBY*- Stand-by
6
Do not connect
7
V
in
8
V
in
9
V
in
10
V
in
11
V
in
12
Remote Sense Gnd
13
GND
C in = Required 2400碌F electrolytic
C out = Required 2400碌F electrolytic
L1 = Optional 1碌H input choke
Pin Function
14
GND
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
= 2400碌F
Efficiency
Switching Frequency
Absolute Maximum
Operating Temperature Range
Recommended Operating
Temperature Range
Storage Temperature
Weight
PT7772 SERIES
Symbols
I
o
V
in
鈭哣
o
Reg
line
Reg
load
V
n
t
tr
V
os
畏
茠
o
T
a
T
a
T
s
鈥?/div>
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
= +3.3V, I
o
= 32A
0擄C
鈮?/div>
T
a
鈮?/div>
+55擄C
3.1V
鈮?/div>
V
in
鈮?/div>
3.6V, I
o
= 32A
V
in
= +3.3V, 0.1
鈮?/div>
I
o
鈮?/div>
32A
V
in
= +3.3V, I
o
= 32A
I
o
step between 16A and 32A
V
o
over/undershoot
V
in
= +3.3V, I
o
= 20A, V
o
= 1.8V
3.1V
鈮?/div>
V
in
鈮?/div>
3.6V
0.1A
鈮?/div>
I
o
鈮?/div>
32A
鈥?/div>
Forced Air Flow = 200 LFM
Over V
in and
I
o
Ranges
鈥?/div>
Vertical/Horizontal
Min
0.1
(1)
0.1
(1)
3.1
(2)
V
o
-0.03
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
650
0
0
-40
鈥?/div>
Typ
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鹵10
鹵10
50
100
200
90
700
鈥?/div>
鈥?/div>
鈥?/div>
53/66
Max
32
26
3.6
V
o
+0.03
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
750
+85
+65
+125
鈥?/div>
Units
A
A
V
V
mV
mV
mV
碌Sec
mV
%
kHz
擄C
擄C
擄C
grams
(1) ISR-will operate down to no load with reduced specifications. Please note that this product is not short-circuit protected.
(2) The minimum input voltage is 3.1V or V
out
+1.2V, whichever is greater.
Output Capacitors:
The PT7772 series requires a minimum output capacitance of 2400碌F for proper operation. Do not use Oscon type capacitors.
The maximum allowable output capacitance is 30,000碌F.
Input Filter:
An input filter is optional for most applications. The input inductor must be sized to handle 32ADC with a typical value of 1碌H.
The input capacitance must be rated for a minimum of 2.6Arms of ripple current. For transient or dynamic load applications, additional
capacitance may be required.
14
Power Trends, Inc.
27715 Diehl Road, Warrenville, IL 60555
(800) 531-5782
Fax: (630) 393-6902
http://www.powertrends.com
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