For assistance or to order, call
(800) 531-5782
PT7773
5V
32 AMP HIGH-PERFORMANCE
鈥淪LEDGE HAMMER鈥?PROGRAMMABLE ISR
Description
The PT7773 is one of a 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 5V systems.
The output voltage of the PT7773
is programmable over the low volt-
age range, 0.8V to 3.1V via a 5-bit
input. A differential remote sense is
also provided, which automatically
compensates for any voltage drop
between the ISR and load.
An output capacitance of 2400碌F
is required for proper operation.
SLTS078
(Revised 5/31/2000)
Pin-Out Information
Standard Application
PROGRAMMING PINS
VID0
VID1
VID2
VID3
VID4
REMOTE SENSE (+)
6 4 3 2 1
26
V
IN
L1
7 - 11
1H
+
27
PT7773
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
VID4
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 T
olerance
Line Regulation
Load Regulation
V
o
Ripple/Noise pk-pk
Transient Response
with C
out
= 2400碌F
Efficiency
Switching Frequency
Absolute Maximum
Operating T
emperature Range
Storage T
emperature
Weight
PT7773 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
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
= +5V, I
o
= 32A
0擄C
鈮?/div>
T
a
鈮?/div>
+55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
= 2.5V
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>
Vertical/Horizontal
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>
650
0
-40
鈥?/div>
Typ
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鹵10
鹵10
50
100
200
86
700
鈥?/div>
鈥?/div>
53/66
Max
32
26
5.5
V
o
+0.03
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
750
+85
(2)
+125
鈥?/div>
Units
A
V
V
mV
mV
mV
碌Sec
mV
%
kHz
擄C
擄C
grams
Notes:
(1) ISR-will operate down to no load with reduced specifications. Please note that this product is not short-circuit protected.
(2) See SOA curves or consult the factory for the appropriate derating.
Output Capacitors:
The PT7773 series requires a minimum output capacitance of 2400碌F for proper operation. Do not use Oscon type capacitors. The maximum allow-
able 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.
Power Trends, Inc.
27715 Diehl Road, Warrenville, IL 60555
(800) 531-5782
Fax: (630) 393-6902
http://www.ti.com/powertrends
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