PT7705鈥?V
18 Amp 鈥淏ig-Hammer鈥?Programmable
Integrated Switching Regulator
SLTS045A
(Revised 6/30/2000)
The PT7705 is a series of high-
performance, 18 Amp Integrated
Switching Regulators (ISRs) housed in
a 27-pin SIP package. The 18A capa-
bility allows easy integration of the
latest high-speed, low-voltage 碌Ps 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 I
out
in incre-
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鈥檚 Pentium
廬
II Processor.
A differential remote sense is also
provided which automatically com-
pensates for any voltage drop from the
ISR to the load.
1200碌F of output capacitance are
required for proper operation.
Standard Application
PROGRAMMING PINS
VID0
VID1
VID2
VID3
VID4
REMOTE SENSE (+)
6 4 3 2 1
26
Pin-Out Information
Pin Function
1
2
20 - 25
Pin Function
10
11
12
13
14
15
16
17
V
in
V
in
Remote Sense Gnd
Pin Function
18
19
20
21
22
23
24
25
26
27
GND
GND
V
out
V
out
V
out
V
out
V
out
V
out
Remote Sense V
out
VID0
VID1
VID2
VID3
STBY* - Stand-by
V
IN
L1
7 - 11
1碌H
+
27
PT7705
13 - 19
5
12
V
OUT
3
4
5
6
7
8
9
C
IN
SYNC OUT
GND
STBY*
C
OUT
+
LOAD
GND
GND
GND
GND
GND
VID4
V
in
V
in
V
in
GND
REMOTE SENSE (-)
Specifications
Characteristics
(T
a
= 25擄C unless noted)
Output Current
Input Voltage Range
Cin = Required 1200碌F electrolytic
Cout= Required 1200碌F electrolytic
L1 = Optional 1碌H input choke
For STBY* pin;
open = output enabled
ground = output disabled.
Sync Out
PT7705 SERIES
Symbols
I
o
V
in
鈭哣
o
Reg
line
Reg
load
V
n
t
tr
V
os
畏
Conditions
T
a
= +60擄C, 200 LFM, pkg N
T
a
= +25擄C, natural convection
0.1A
鈮?/div>
I
o
鈮?/div>
15A
V
in
= +5V, I
o
= 15A
0擄C
鈮?/div>
T
a
鈮?/div>
+65擄C
4.5V
鈮?/div>
V
in
鈮?/div>
5.5V, I
o
= 15A
V
in
= +5V, 0.1
鈮?/div>
I
o
鈮?/div>
15A
V
in
= +5V, I
o
= 15A
I
o
step between 7.5A and 15A
V
o
over/undershoot
V
in
= +5V, I
o
= 10A
V
o
V
o
V
o
V
o
V
o
=
=
=
=
=
3.3V
2.9V
2.5V
1.8V
1.5V
Min
0.1
0.1
4.5
(1)
(1)
(3)
Typ
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鹵10
鹵10
50
100
200
89
87
85
79
77
700
鈥?/div>
鈥?/div>
500
10
31/41
Max
18
15
(2)
(2)
Units
A
V
V
mV
mV
mV
碌Sec
mV
5.5
V
o
+0.03
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
750
+85
(4)
+125
鈥?/div>
鈥?/div>
鈥?/div>
Output Voltage Tolerance
Line Regulation
Load Regulation
V
o
Ripple/Noise
Transient Response
with C
out
= 1200碌F
Efficiency
V
o
-0.03
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
650
0
-40
鈥?/div>
鈥?/div>
鈥?/div>
%
Switching Frequency
Absolute Maximum
Operating Temperature Range
Storage Temperature
Mechanical Shock
Mechanical Vibration
Weight
茠
o
T
a
T
s
4.5V
鈮?/div>
V
in
鈮?/div>
5.5V
0.1A
鈮?/div>
I
o
鈮?/div>
15A
Over V
in
Range
鈥?/div>
Per Mil-STD-883D, Method 2002.3
1 msec, Half Sine, mounted to a fixture
Per Mil-STD-883D, Method 2007.2,
20-2000 Hz, Soldered in a PC board
kHz
擄C
擄C
G鈥檚
G鈥檚
grams
鈥?/div>
Vertical/Horizontal
Notes:
(1)
(2)
(3)
(4)
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 Vout+1.2V, whichever is greater.
See SOA curves or consult the factory for the appripriate derating.
Output Capacitors:
The PT7705 series requires a minimum ouput capacitance of 1200碌F for proper operation. Do not use Oscon type capacitors. The maximum
allowable output capacitance is 15,000碌F. 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 1碌H. 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
next
標準包裝 10
類別 電源 - 板載
家庭 DC DC Converters
系列 PT7700
類型 非隔離（POL）
輸出數(shù) 1
電壓 - 輸入（最?。?/label>4.5V
電壓 - 輸入（最大） 5.5V
Voltage - Output 1 1.3 ~ 3.5 V
Voltage - Output 2 -
Voltage - Output 3 -
電流 - 輸出（最大） 18A
電源（瓦） - 制造商系列 63W
電壓 - 隔離 -
特點 -
安裝類型 通孔
封裝/外殼 27-SIP 模塊
尺寸/尺寸 -
包裝 托盤
工作溫度 0°C ~ 85°C
效率 89%
電源（瓦特）- 最大 63W
型號
版本
描述
廠商
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