For assistance or to order, call (800) 531-5782
P T 7 7 0 0 S e r i e s
SLTS077
Revised 5/31/00
15 AMP HIGH-PERFORMANCE
“BIG HAMMER” PROGRAMMABLE ISR
The PT7700 is a new series of high-
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 PentiumPro
Processor. A differential remote sense is
also provided which automatically
compensates for any voltage drop from the
ISR to the load.
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
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
• Single-Device: +5V input
Standard Application
Ordering Information
in
out
PT7701❏ = 2 to 3.5 Volts
PT7702❏ = 1.3 to 2 Volts
L1 = Required 1µH input choke
PROGRAMMING PINS
VID0
VID1
VID2
VID3
REMOTE SENSE (+)
• 4-bit Programmable:
2V to 3.5V@15A or
4
3
2
1
26
N = Vertical through-hole
A = Horizontal through-hole
C = Horizontal surface-mount
L1
VIN
VOUT
7 - 11
20 - 25
1.3V to 2V @ 15A output
PT7700
1µH
• High Efficiency
• Input Voltage Range:
4.5V to 5.5V
• Differential Remote Sense
• 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)
27
13 - 19
5
12
+
+
+
+
+
+
+
+
Programming Information
CIN
COUT
LOAD
SYNC OUT
GND
PT7701 PT7702
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
GND
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
STBY*
REMOTE SENSE (-)
Pin-Out Information
Pin Function
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
in
• Parallelable with PT7749
15A “Current Boosters”
VID1
V
V
out
in
VID2
Remote Sense Gnd
GND
V
out
VID3
V
out
STBY* - Stand-by
GND
V
out
V
GND
V
out
in
V
GND
V
out
in
V
GND
Remote Sense V
Sync Out
out
in
V
GND
in
Note: Logic 0 = Pin 12 (remote sense gnd) potential
Logic 1 = Open circuit (no pull-up resistors)
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)
Typ
—
Max
15(2)
5.5
Units
ADC
VDC
Output Current
4.5V ≤ Vin ≤ 5.5V
0.1A ≤ Io ≤ 15A
Input Voltage Range
Static Voltage Tolerance
Vin
4.5(3)
—
Vo
Vin = +5V, Io = 15A
Vo-0.05
—
Vo+0.05
VDC
0°C ≤ Ta ≤ +55°C
Line Regulation
Regline
Regload
Vn
4.5V ≤ Vin ≤ 5.5V, Io = 15A
Vin = +5V, 0.1 ≤ Io ≤ 15A
Vin = +5V, Io = 15A
—
—
—
10
10
—
—
—
mV
mV
mV
Load Regulation
Vo Ripple/Noise pk-pk
50
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
—
—
—
—
—
89
87
85
79
77
—
—
—
—
—
%
%
%
%
%
Vo = 2.9V
Vo = 2.5V
Vo = 1.8V
Vo = 1.5V
Switching Frequency
ƒo
4.5V ≤ Vin ≤ 5.5V
0.1A ≤ Io ≤ 15A
650
0
700
—
750
+55
kHz
°C
Operating Temperature
Ta
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.
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.ti.com/powertrends
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