PT7706—3.3V
18 Amp “Big-Hammer” Programmable
Integrated Switching Regulator
SLTS046A
(Revised 6/30/2000)
The PT7706 is a high-performance
18-Amp Integrated Switching Regulator
(ISR), housed in a 27-pin SIP package.
The 18A capability allows easy integra-
tion of the latest high-speed, low-voltage
µPs, DSPs, ASICs, and bus drivers into
existing 3.3V systems.
The PT7706 series has been designed
to work in parallel with one or more of
the PT7749 - 18A current boosters for
increased Iout in increments of 18A.
The output voltage of the PT7706 can
be easily programmed with a 4 bit input
compatible with Intel’s Pentiumâ II Pro-
cessor. A differential remote sense is also
provided which automatically compen-
sates for any voltage drop from the ISR to
the load.
An input capacitance of 1200µF, and
output capacitance of 330µF are required
for proper operation.
Pin-Out Information
Pin Function
Standard Application
Pin Function
10 Vin
11 Vin
Pin Function
19 GND
20 Vout
PROGRAMMING PINS
VID0
1
2
3
4
5
6
7
8
9
VID0
VID1
VID2
VID3
REMOTE SENSE (+)
VID1
4
3
2
1
26
L1
VID2
12 Remote Sense Gnd
13 GND
14 GND
15 GND
16 GND
17 GND
18 GND
21 Vout
VIN
VOUT
7
-
11
20 - 25
PT7706
1µH
VID3
22 Vout
23 Vout
27
13
-
19
5
12
+
+
STBY* - Stand-by
Do not connect
Vin
CIN
COUT
LOAD
SYNC OUT
GND
24 Vout
GND
25 Vout
STBY*
REMOTE SENSE (-)
Vin
Vin
26 Remote Sense V
27 Sync Out
out
C
C
= Required 1200µF electrolytic
= Required 330µF electrolytic
in
out
For STBY* pin; open = output enabled
L1 = Optional 1µH input choke
ground = output disabled.
Specifications
PT7706 SERIES
Typ
Characteristics
(Ta = 25°C unless noted)
Symbols
Conditions
Min
Max
Units
(1)
(1)
(2)
(2)
Output Current
Io
Ta = +60°C, 200 LFM, pkg N
Ta = +25°C, natural convection
0.1
0.1
—
—
18
15
A
V
V
(3)
Input Voltage Range
Vin
0.1A ≤ Io ≤ 15A
3.1
—
3.6
Output Voltage Tolerance
∆Vo
Vin = +3.3V, Io = 18A
Vo-0.03
—
Vo+0.03
0°C ≤ Ta ≤ +65°C
Line Regulation
Load Regulation
Vo Ripple/Noise
Regline
Regload
Vn
3.1V ≤ Vin ≤ 3.6V, Io = 18A
Vin = +3.3V, 0.1 ≤ Io ≤ 18A
Vin = +3.3V, Io = 18A
—
—
—
±10
±10
50
—
—
—
mV
mV
mV
Transient Response
with Cout = 330µF
ttr
Io step between 9A and 18A
Vo over/undershoot
—
—
100
200
—
—
µSec
mV
Vos
Efficiency
η
Vin = +3.3V, Io = 10A
Vo = 1.8V
Vo = 1.5V
—
—
79
77
—
—
%
%
Switching Frequency
ƒo
Ta
Ts
3.1V ≤ Vin ≤ 3.6V
0.1A ≤ Io ≤ 18A
650
0
700
—
750
kHz
°C
(4)
Absolute Maximum
—
+85
Operating Temperature Range
Storage Temperature
Mechanical Shock
—
-40
—
+125
°C
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
Notes: (1) The ISR will operate down to no load with reduced specifications. Please note that this product is not short-circuit protected.
(2) The PT7706 series can be easily paralleled with one or more of the PT7749 Current Boosters to provide increased output current in increments of 18A.
(3) The minimum input voltage is 3.1V or V +1.2V, whichever is greater.
out
(4) See Safe Operating Area curves.
Output Capacitors: The PT7706 series requires a minimum ouput capacitance of 330µF for proper operation. Do not use Oscon type capacitors. The maximum
allowable output capacitance is 15,000µF.
Input Filter: An input filter is optional for most applications. The input inductor must be sized to handle 18ADC 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.
For technical support and more information, see inside back cover or visit www.ti.com/powertrends
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