For assistance or to order, call (800) 531-5782
SLTS125
(Revised 5/9/97)
P T 7 7 0 3
S e r i e s
15 AMP HIGH-PERFORMANCE
“BIG HAMMER” PROGRAMMABLE ISR
The PT7700 is a new series of high-
performance, 15 Amp Integrated Switching
Regulators (ISRs) housed in a 27-pin SIP
package. The 15A capability allows easy
integration of the latest high-speed, low-
voltage µPs and bus drivers into existing 5V
systems.
The PT7700 series has been designed to
work in parallel with one or more of the
PT7749 - 15A current boosters for
Two products are offered in the series
with different output voltage ranges that are
easily programmed with a 4 bit input
compatible with Intel’s Pentium Pro
Processor. A differential remote sense is
also provided which automatically
compensates for any voltage drop from the
ISR to the load.
An input filter and 1200µF of output
capacitance are required for proper
operation.
increased I in increments of 15A.
out
C
C
= Required 330µF electrolytic (x4)
= Required 330µF electrolytic (x4)
Features
Standard Application
Ordering Information
in
out
PT7703 = 1.15 to 1.525 Volts
❏
• Single-Device: +5V input
• 4-bit Programmable
• High Efficiency
• Input Voltage Range:
4.5V to 5.5V
L1 = Required 1µH input choke
PROGRAMMING PINS
VID0
VID1
VID2
VID3
REMOTE SENSE (+)
26
N
A
C
= Vertical through-hole
= Horizontal through-hole
= Horizontal surface-mount
4
3
2 1
L1
VIN
VOUT
7
-
11
20 - 25
PT7700
1µH
Programming Information
27
13
-
19
5
12
+
+
+
+
+
+
+
+
PT7701 PT7702
CIN
COUT
LOAD
VID3 VID2 VID1 VID0
Vout
2.0V
2.1V
2.2V
2.3V
2.4V
2.5V
2.6V
2.7V
2.8V
2.9V
3.0V
3.1V
3.2V
3.3V
3.4V
3.5V
Vout
1.30V
1.35V
1.40V
1.45V
1.50V
1.55V
1.60V
1.65V
1.70V
1.75V
1.80V
1.85V
1.90V
1.95V
2.00V
2.05V
SYNC OUT
GND
• Differential Remote Sense
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
GND
• 27-pin SIP Package:
V = 1.0”(H) x 3”(L) x 0.55”(W)
H = 0.55”(H) x 3”(L) x 1.5”(W)
STBY*
REMOTE SENSE (-)
Pin-Out Information
Pin Function
• Parallelable with PT7749
15A “Current Boosters”
Pin Function
Pin Function
1
2
3
4
5
6
7
8
9
VID0
10
11
12
13
14
15
16
17
18
V
19
20
21
22
23
24
25
26
27
GND
Vout
Vout
Vout
Vout
Vout
Vout
in
in
VID1
V
VID2
Remote Sense Gnd
GND
VID3
STBY* - Stand-by
Do Not Connect
GND
GND
V
in
GND
V
in
GND
Remote Sense Vout
Sync Out
Note: Logic 0 = Pin 12 (remote sense gnd) potential
Logic 1 = Open circuit (no pull-up resistors)
Do not change programming codes without Vin removed
or STBY* activated.
V
in
GND
For STBY* pin; open= output enabled; ground = output disabled.
Specifications
PT7700 SERIES
Characteristics
(TA = 25°C unless noted)
Symbols
Io
Conditions
Min
0.1(1)
4.5(3)
Typ
—
Max
15(2)
5.5
Units
ADC
VDC
Output Current
4.5V
0.1A
≤
≤
Vin
Io
≤
5.5V
Input Voltage Range
Static Voltage Tolerance
Vin
≤
15A
—
Vo
Vin = +5V, Io = 15A
0°C Ta +55°C
Vo
-0.03
—
V
o
+0.03 VDC
≤
≤
Line Regulation
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
Load Regulation
≤
≤
Vo Ripple/Noise pk-pk
Transient Response
with Cout = 1200µF
ttr
Vos
Io step between 7.5A and 15A
Vo over/undershoot
—
—
100
200
—
—
µSec
mV
Efficiency
η
Vin = +5V, Io = 10A
Vo = 3.3V
Vo = 1.2V
—
—
89
75
—
—
%
%
Switching Frequency
Operating Temperature
ƒo
Ta
4.5V
0.1A
≤
≤
Vin
Io
≤
5.5V
650
0
700
—
750
+55
kHz
°C
≤
15A
Forced Air Flow = 200 LFM
Over Vin and Io Ranges
Storage Temperature
Weight
Ts
—
—
—
-40
—
0
—
+125
—
°C
—
TBD
—
grams
%
Relative Humidity
Non-condensing
95
(1) ISR will operate down to no load with reduced specifications Please note that this product is not short-circuit protected.
(2) The PT7700 series can be easily paralleled with one or more of the PT7749 slave modules to provide increased output current in increments of 15A.
Please contact Power Trends for the appropriate application note.
(3) The minimum input voltage is 4.5V or V +1.2V, whichever is greater.
out
Output Capacitors: The PT7700 series requires a minimum output capacitance of 1200µF for proper operation. To reduce ESR, Power Trends recommends using four 330µF
electrolytic capacitors in parallel. Maximum allowable output capacitance is 15,000µF.
Input Filter: An input filter is required for all applications. The input inductor must be sized to handle 15ADC with a typical value of 1µH. The input capacitance must be rated
for 14Arms of ripple current. Power Trends recommends using four Sanyo OSCON style capacitors with a 3.5Arms ripple current rating in parallel (p/n 6SA330M).
Power Trends, Inc. 27715 Diehl Road, Warrenville, IL 60555 USA (800) 531-5782 Fax: (630) 393-6902 http://www.powertrends.com