32 Amp 鈥淪ledge Hammer鈥?/div>
Programmable ISR
SLTS055A
(Revised 6/30/2000)
The PT7772 is a high-output Inte-
grated Switching Regulator (ISR)
housed in a 27-pin SIP package. The
PT7772 operates from a 3.3V bus to
provide a 32 amp low-voltage power
source for the industry鈥檚 latest high-
speed 碌Ps, ASICs, DSPs.
The PT7772 has been designed to
work in parallel with one or more of
the PT7746 -32A current boosters to
increase the load current capability in
increments of 32A.
The output voltage is program-
mable from 1.3V to 2.05V with a 4-bit
input, compatible with Intel鈥檚 Pentium
芒
Pro Processor. A differential remote
sense is also provided, to compensate
for voltage drop between the ISR and
load.
The PT7772 requires a capacitance
of 2400碌F at the input, and 680碌F at
the output for proper operation. Note
that this product does not include short
circuit protection.
Pin-Out Information
Standard Application
PROGRAMMING PINS
VID0
VID1
VID2
VID3
4 3 2 1
26
REMOTE SENSE (+)
V
IN
L1
7 - 11
1H
+
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
Cin = Required 2400碌F electrolytic
Cout = Required 680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
Gnd = 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
PT7772 SERIES
Symbols
I
o
V
in
鈭哣
o
Reg
line
Reg
load
V
n
t
tr
V
os
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
= +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
C
out
=680碌F, I
o
=25% load step from 24A
V
o
over/undershoot
C
out
=2400碌F, I
o
=50% load step from 16A
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>
鈥?/div>
Vertical/Horizontal
Min
0.1
0.1
3.1
(1)
(1)
(2)
Typ
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鹵10
鹵10
50
100
200
100
200
90
700
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>
鈥?/div>
鈥?/div>
750
+85
(3)
Units
A
A
V
V
mV
mV
mV
碌s
mV
碌s
mV
%
kHz
擄C
擄C
grams
V
o
-0.03
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
650
0
-40
鈥?/div>
Efficiency
Switching Frequency
Absolute Maximum
Operating T
emperature Range
Storage T
emperature
Weight
+125
鈥?/div>
Notes:
(1) The ISR will operate down to no load with reduced specifications.
(2) The minimum input voltage is 3.1V or V
out
+1.2V whichever is greater.
,
(3) See Safe Operating Area curves for appropriate derating.
Output Capacitors:
The PT7772 series requires a minimum output capacitance of 680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.
For technical support and more information, see inside back cover or visit www.ti.com/powertrends
PT7772N 產(chǎn)品屬性
8
電源 - 板載
DC DC Converters
PT7770
非隔離（POL）
1
3.6V
1.3 ~ 2.05 V
-
-
32A
65W
-
-
通孔
27-SIP 模塊
-
托盤
0°C ~ 85°C
90%
65.6W
PT7772N相關(guān)型號PDF文件下載
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