Application Notes
Mechanical Outline
For assistance or to order, call (800) 531-5782
Product Selector Guide
P T 7 7 0 5 S e r i e s
18 AMP “BIG-HAMMER” PROGRAMMABLE
INTEGRATED SWITCHING REGULATOR
Revised 5/15/98
The PT7705 is a new series of
high-performance, 18 Amp Integrated
ments of 18A.
The output voltage of the PT7705
can be easily programmed from 1.3V
to 3.5V with a 5 bit input compatible
with Intel’s Pentium II Processor.
A differential remote sense is also pro-
vided which automatically compensates
for any voltage drop from the ISR to
the load.
Switching Regulators (ISRs) housed in
a 27-pin SIP package. The 18A capa-
bility allows easy integration of the
latest high-speed, low-voltage µPs and
bus drivers into existing 5V systems.
The PT7705 series has been de-
signed to work in parallel with one or
more of the PT7749 - 18A current
boosters for increased Iout in incre-
1200µF of output capacitance are
required for proper operation.
Pin-Out Information
Pin Function
Pin Function
10 Vin
11 Vin
12 Remote Sense Gnd
13 GND
14 GND
15 GND
16 GND
17 GND
18 GND
Pin Function
19 GND
20 Vout
21 Vout
22 Vout
23 Vout
24 Vout
25 Vout
1
2
3
4
5
6
7
8
9
VID0
VID1
VID2
VID3
STBY* - Stand-by
VID4
Vin
Standard Application
PROGRAMMING PINS
VID0
VID1
VID2
VID3
VID4
REMOTE SENSE (+)
6
4
3
2
1
26
L1
VIN
VOUT
7
-
11
20 - 25
PT7705
1µH
27
13
-
19
5
12
+
+
CIN
COUT
LOAD
SYNC OUT
GND
GND
STBY*
REMOTE SENSE (-)
Vin
Vin
26 Remote Sense V
out
27 Sync Out
C
C
= Required 1200µF electrolytic
= Required 1200µF electrolytic
in
out
For STBY* pin; open = output enabled; ground = output
disabled.
L1 = Optional 1µH input choke
Specifications
PT7705 SERIES
Characteristics
(Ta = 25°C unless noted)
Symbols
Conditions
Min
Typ
Max
Units
Output Current
Io
Ta = +60°C, 200 LFM, pkg N
Ta = +25°C, natural convection
0.1*
—
—
18**
15**
A
A
0.1*
Input Voltage Range
Vin
0.1A ≤ Io ≤ 15A
4.5***
—
5.5
V
Output Voltage Tolerance
∆Vo
Vin = +5V, Io = 15A
Vo-0.03
—
Vo+0.03
V
0°C ≤ Ta ≤ +65°C
Line Regulation
Load Regulation
Vo Ripple/Noise
Regline
Regload
Vn
4.5V ≤ Vin ≤ 5.5V, Io = 15A
Vin = +5V, 0.1 ≤ Io ≤ 15A
Vin = +5V, Io = 15A
—
—
—
±10
±10
50
—
—
—
mV
mV
mV
Transient Response
with Cout = 1200µF
ttr
Io step between 7.5A and 15A
Vo over/undershoot
—
—
100
200
—
—
µSec
mV
Vos
Efficiency
η
Vin = +5V, Io = 10A
Vo = 3.3V
Vo = 2.9V
Vo = 2.5V
Vo = 1.8V
Vo = 1.5V
—
—
—
—
—
89
87
85
79
77
—
—
—
—
—
%
%
%
%
%
Switching Frequency
ƒo
4.5V ≤ Vin ≤ 5.5V
0.1A ≤ Io ≤ 15A
650
0
700
—
750
+85
kHz
°C
Absolute Maximum
Ta
Ta
Ts
—
Operating Temperature Range
Recommended Operating
Temperature Range
Forced Air Flow = 200 LFM
Over Vin and Io Ranges
0
—
—
+65****
+125
°C
°C
Storage Temperature
Mechanical Shock
—
-40
Per Mil-STD-883D, Method 2002.3
1 msec, Half Sine, mounted to a fixture
—
—
—
500
10
—
—
—
G’s
Mechanical Vibration
Per Mil-STD-883D, Method 2007.2,
20-2000 Hz, Soldered in a PC board
G’s
Weight
—
Vertical/Horizontal
31/41
grams
* ISR-will operate down to no load with reduced specifications. Please note that this product is not short-circuit protected.
**The PT7705 series can be easily paralleled with one or more of the PT7749 Current Boosters to provide increased output current in increments of 18A.
*** The minimum input voltage is 4.5V or V +1.2V, whichever is greater. ****See SOA curves.
out
Output Capacitors: The PT7705 series requires a minimum ouput capacitance of 1200µF for proper operation. Do not use Oscon type capacitors. The maximum
allowable output capacitance is 15,000µF. See Capacitor Application Note.
Input Filter: An input filter is optional for most applications. The input inductor must be sized to handle 15ADC with a typical value of 1µH. The input capacitance must be
rated for a minimum of 1.3Arms of ripple current. For transient or dynamic load applications, additional capacitance may be required.
38
Power Trends, Inc. 27715 Diehl Road, Warrenville, IL 60555 (800) 531-5782 Fax: (630) 393-6902 http://www.powertrends.com
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