For assistance or to order, call (800) 531-5782
Revised 1/13/99
P T 7 7 2 0 S e r i e s
Application Notes
Mechanical Outline
Product Selector Guide
17 AMP 12V INPUT “BIG-HAMMER II” 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 µPs 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 Iout
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’s
Pentium IIProcessor. A differential re-
mote sense is also provided which
automatically compensates for any voltage
drop from the ISR to the load.
1200µF of output capacitance is re-
quired for proper operation.
Pin-Out Information
Features
Pin Function
Pin Function
• +12V bus input
• 5-bit Programmable:
1.3V to 3.5V or
1
2
3
4
5
6
7
8
VID0
VID1
VID2
VID3
STBY* - Stand-by
VID4
Vin
15 GND
16 GND
17 GND
Standard Application
PROGRAMMING PINS
4.5V to 7.6V
VID0
VID1
VID2
VID3
18 GND
19 GND
20 Vout
21 Vout
22 Vout
23 Vout
24 Vout
25 Vout
REMOTE SENSE (+)
• High Efficiency
• Differential Remote Sense
• 27-pin SIP Package
• Parallelable with PT7748
17A current boosters
VID4
6
4
3
2
1
26
L1
VIN
VOUT
7
-
11
20 - 25
PT7720
1µH
Vin
27
13
-
19
5
12
+
+
CIN
COUT
LOAD
9
10
11
12
13
14
Vin
Vin
Vin
SYNC OUT
GND
GND
STBY*
REMOTE SENSE (-)
Remote Sense Gnd
GND
GND
26
Remote Sense Vout
C
= Required 560µF electrolytic
(See input filter note)
in
27 Sync Out
For STBY* pin:
open = output enabled
ground = output disabled.
C
= Required 1200µF electrolytic
out
L1 = Optional 1µH input choke
Specifications
PT7720 SERIES
Characteristics
(Ta = 25°C unless noted)
Symbols
Conditions
Min
Typ
Max
Units
Output Current
Io
Ta = +60°C, 200 LFM, pkg N, Vo ≤ 5V
Ta = +25°C, natural convection, Vo ≤ 5V
0.1*
0.1*
—
—
17**
17**
A
A
Output Power
Po
Ta = +60°C, 200 LFM, pkg N, Vo ≥ 5V
Ta = +25°C, natural convection, Vo ≥ 5V
—
—
—
—
85
85
Watts
Watts
Input Voltage Range
Vin
0.1A ≤ Io ≤ 17A
11.0
—
14.0
V
Output Voltage Tolerance
∆Vo
Vin = +12V, Io = 17A
(PT7721)
(PT7722)
Vo-0.03
—
—
Vo+0.03
±2.0%
V
0°C ≤ Ta ≤ +60°C
±1.0%
% Vo
Line Regulation
Load Regulation
Vo Ripple/Noise
Regline
Regload
Vn
11V ≤ Vin ≤ 14V, Io = 17A (Using remote sense)
Vin = +12V, 0.1 ≤ Io ≤ 17A (Using remote sense)
—
—
±5
±5
±10
±10
mV
mV
Vin = +12V, Io = 17A
(PT7721)
(PT7722)
—
—
50
—
—
mVpp
mVpp
100
Transient Response
with Cout = 1200µF
ttr
Io step between 7.5A and 15A
Vo over/undershoot
—
—
100
200
—
—
µSec
mV
Vos
Efficiency
η
Vin = +12V, Io = 10A
Vo = 5.0V
Vo = 3.3V
Vo = 2.5V
Vo = 1.5V
—
—
—
—
90
88
85
78
—
—
—
—
%
%
%
%
Switching Frequency
ƒo
11V ≤ Vin ≤ 14V
0.1A ≤ Io ≤ 17A
300
0
350
—
400
+85
kHz
°C
Absolute Maximum
Operating Temperature Range
Ta
—
Recommended Operating
Temperature Range
Ta
Ts
Forced Air Flow = 200 LFM
0
—
+65***
+125
—
°C
°C
G’s
At Vin
—
Io = 12A
= 12V,
Storage Temperature
Mechanical Shock
-40
—
—
Per Mil-STD-883D, Method 2002.3 , 1 msec,
Half Sine, mounted to a fixture
TBD
Mechanical Vibration
Weight
Per Mil-STD-883D, Method 2007.2,
20-2000 Hz, Soldered in a PC board
Vertical/Horizontal
—
—
TBD
—
—
G’s
—
51/64
grams
*
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 1200µF for proper operation. Do not use Oscon type capacitors. The maximum allowable output capacitance
Is (57,000 ÷ Vout)µF, or 15,000µF, 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 1µH. 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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