For assistance or to order, call
(800) 531-5782
Revised 1/13/99
PT7720
Series
17 AMP 12V INPUT 鈥淏IG-HAMMER II鈥?PRO-
GRAMMABLE ISR
The PT7720 series is a new +12V input,
17A output, high-performance Integrated
Switching Regulator (ISR) housed in a 27-
pin SIP package. The 17A capability allows
easy integration of the latest high-speed,
low-voltage 碌Ps and bus drivers into +12V
distributed power systems.
The PT7720 series has been designed
to work in parallel with one or more of the
PT7748 current boosters for increased I
out
Application Notes
Mechanical Outline
Product Selector Guide
in increments of 17A.
The output voltage of the PT7721 can
be easily programmed from 1.3V to 3.5V
with a 5 bit input compatible with Intel鈥檚
Pentium
廬
IIProcessor. A differential re-
mote sense is also provided which
automatically compensates for any voltage
drop from the ISR to the load.
1200碌F of output capacitance is re-
quired for proper operation.
Pin-Out Information
Pin Function
Pin Function
15
16
17
18
19
20
21
22
23
24
25
26
27
GND
GND
GND
GND
GND
V
out
V
out
V
out
V
out
V
out
V
out
Remote Sense
V
out
Features
鈥?/div>
+12V bus input
鈥?/div>
5-bit Programmable:
1.3V to 3.5V or
4.5V to 7.6V
鈥?/div>
High Efficiency
鈥?/div>
Differential Remote Sense
鈥?/div>
27-pin SIP Package
鈥?/div>
Parallelable with PT7748
17A current boosters
Standard Application
PROGRAMMING PINS
VID0
VID1
VID2
VID3
VID4
REMOTE SENSE (+)
6 4 3 2 1
26
V
IN
L1
7 - 11
1碌H
+
27
PT7720
13 - 19
5
12
20 - 25
V
OUT
C
IN
SYNC OUT
GND
STBY*
C
OUT
+
LOAD
GND
REMOTE SENSE (-)
= Required 560碌F electrolytic
(See input filter note)
C out = Required 1200碌F electrolytic
L1 = Optional 1碌H input choke
Cin
1
2
3
4
5
6
7
8
9
10
11
12
13
14
VID0
VID1
VID2
VID3
STBY* - Stand-by
VID4
V
in
V
in
V
in
V
in
V
in
Remote Sense Gnd
GND
GND
Sync Out
Specifications
Characteristics
(T
a
= 25擄C unless noted)
Output Current
Output Power
Input Voltage Range
Output Voltage Tolerance
Line Regulation
Load Regulation
V
o
Ripple/Noise
Transient Response
with C
out
= 1200碌F
Efficiency
Symbols
I
o
P
o
V
in
鈭哣
o
Reg
line
Reg
load
V
n
t
tr
V
os
畏
Conditions
For STBY* pin:
open = output enabled
ground = output disabled.
PT7720 SERIES
Min
0.1
*
0.1
*
鈥?/div>
鈥?/div>
11.0
(PT7721)
(PT7722)
V
o
-0.03
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
V
o
V
o
V
o
V
o
= 5.0V
= 3.3V
= 2.5V
= 1.5V
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
300
0
0
-40
鈥?/div>
鈥?/div>
鈥?/div>
Typ
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鹵1.0%
鹵5
鹵5
50
100
100
200
90
88
85
78
350
鈥?/div>
鈥?/div>
鈥?/div>
TBD
TBD
51/64
Max
17
**
17
**
85
85
14.0
V
o
+0.03
鹵2.0%
鹵10
鹵10
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
400
+85
+65
***
+125
鈥?/div>
鈥?/div>
鈥?/div>
Units
A
A
Watts
Watts
V
V
% V
o
mV
mV
mVpp
mVpp
碌Sec
mV
%
%
%
%
kHz
擄C
擄C
擄C
G鈥檚
G鈥檚
grams
T
a
=
+60擄C, 200 LFM, pkg N, V
o
鈮?/div>
5V
T
a
=
+25擄C, natural convection, V
o
鈮?/div>
5V
T
a
=
+60擄C, 200 LFM, pkg N, V
o
鈮?/div>
5V
T
a
=
+25擄C, natural convection, V
o
鈮?/div>
5V
0.1A
鈮?/div>
I
o
鈮?/div>
17A
V
in
= +12V, I
o
= 17A
0擄C
鈮?/div>
T
a
鈮?/div>
+60擄C
11V
鈮?/div>
V
in
鈮?/div>
14V, I
o
= 17A (Using remote sense)
V
in
= +12V, 0.1
鈮?/div>
I
o
鈮?/div>
17A (Using remote sense)
V
in
= +12V, I
o
= 17A
I
o
step between 7.5A and 15A
V
o
over/undershoot
V
in
= +12V, I
o
= 10A
(PT7721)
(PT7722)
Switching Frequency
Absolute Maximum
Operating Temperature Range
Recommended Operating
Temperature Range
Storage Temperature
Mechanical Shock
Mechanical Vibration
Weight
茠
o
T
a
T
a
T
s
11V
鈮?/div>
V
in
鈮?/div>
14V
0.1A
鈮?/div>
I
o
鈮?/div>
17A
鈥?/div>
Forced Air Flow = 200 LFM
At V
in =
12V, I
o
= 12A
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
Vertical/Horizontal
鈥?/div>
* ISR-will operate down to no load with reduced specifications. Please note that this product is not short-circuit protected.
** The PT7720 series can be easily paralleled with one or more of the PT7748 Current Boosters to provide increased output current in increments of 17A.
*** See Safe Operating Area chart.
Output Capacitors:
The PT7720 series requires a minimum output capacitance of 1200碌F for proper operation. Do not use Oscon type capacitors. The maximum allowable output capacitance
Is (57,000
梅
Vout)碌F, or 15,000碌F, whichever is less.
Input Filter:
An input inductor is optional for most applications. The input inductor must be sized to handle 7ADC with a typical value of 1碌H. The input capacitance must be rated for a
minimum of 4.0 Arms of ripple current when operated at maximum output current and maximum output voltage. Contact an applications engineer for input capacitor selection for applications
at other output voltages and output currents.
50
Power Trends, Inc.
27715 Diehl Road, Warrenville, IL 60555
(800) 531-5782
Fax: (630) 393-6902
http://www.powertrends.com
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