PT7778鈥?.3V
32 Amp Programmable Integrated
Switching Regulator
SLTS115
(Revised 8/31/2000)
Description
The PT7778 is a high-output 32A
Integrated Switching Regulator (ISR),
housed in a 27-pin SIP package, The
PT7778 is the 3.3V-input bus version
of the PT7779. It includes short
circuit protection and requires only
330碌F of output capacitance for
proper operation.
The output voltage of the PT7778
is programmable from 1.3V to 2.05V
using a 4-bit input, which is compati-
ble with Intel鈥檚 Pentium
廬
II Processors.
The 32A capability provides the
ideal power source for the industry鈥檚
latest high-speed, low-voltage 碌Ps,
DSPs, and custom VLSI devices.
For additional current, the PT7778
may be paralleled with up to two
PT7740 32A current boosters.
A differential remote sense is
provided to compensate for voltage
drop between the ISR and load.
Standard Application
PROGRAMMING PINS
VID0
VID1
VID2
VID3
L1
1碌H
+
STBY
Pin-Out Information
Pin Function
1
VID0
2
VID1
3
VID2
4
VID3
5
STBY*- Stand-by
6
N/C
7
V
in
8
V
in
LOAD
REMOTE SENSE (+)
4
3
2
1
26
SNS(+)
VID3 - VID0
V
IN
7-11
Vin
PT7778
Synch
Out
GND
SNS(-)
Vo
20-25
V
OUT
SYNC OUT
GND
STBY*
C
IN
5
27
13-19
12
+
C
OUT
GND
REMOTE SENSE (鈥?
9
10
11
12
13
14
V
in
V
in
V
in
Remote Sense Gnd
(3)
GND
GND
Pin Function
15
GND
16
GND
17
GND
18
GND
19
GND
20
V
out
21
V
out
22
V
out
23
V
out
24
V
out
25
V
out
26
Remote Sense V
out
27
Sync Out
C in = Required 2400碌F electrolytic
C out = Required 330碌F electrolytic
L1 = Optional 1碌H input choke
For STBY* pin; open = output enabled;
ground = output disabled.
Specifications
Characteristics
(T
a
= 25擄C unless noted)
Output Current
Input Voltage Range
Output Voltage Tolerance
Line Regulation
Load Regulation
V
o
Ripple/Noise pk-pk
Transient Response
with C
out
= 330碌F
Efficiency
Switching Frequency
Absolute Maximum
Operating Temperature Range
Storage Temperature
Mechanical Vibration
Weight
鈥?/div>
PT7778
Symbols
I
o
V
in
鈭哣
o
Reg
line
Reg
load
V
n
t
tr
V
os
畏
茠
o
T
a
T
s
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>
32A
V
in
= +3.3V, I
o
= 32A
鈥?0擄C
鈮?/div>
T
a
鈮?/div>
+85擄C
3.1V
鈮?/div>
V
in
鈮?/div>
3.6V, I
o
= 32A
V
in
= +3.3V, 0.1
鈮?/div>
I
o
鈮?/div>
32A
V
in
= +3.3V, I
o
= 32A
I
o
step between 16A and 32A
V
o
over/undershoot
V
in
= +3.3V, I
o
= 20A, V
o
= 1.8V
3.1V
鈮?/div>
V
in
鈮?/div>
3.6V
0.1A
鈮?/div>
I
o
鈮?/div>
32A
Over V
in
Range
鈥?/div>
Per Mil-STD-883D, Method 2007.2
20-20,000Hz, Soldered in a PC board
Vertical/Horizontal
Min
0.1
0.1
3.1
V
o
-0.03
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
300
鈥?0
-40
鈥?/div>
鈥?/div>
(1)
(1)
Typ
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鹵10
鹵10
50
100
200
90
350
鈥?/div>
鈥?/div>
10/15
53/66
Max
32
31
3.6
V
o
+0.03
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
400
+85
(2)
Units
A
V
V
mV
mV
mV
碌Sec
mV
%
kHz
擄C
擄C
G鈥檚
grams
+125
鈥?/div>
鈥?/div>
Notes:
(1) ISR-will operate down to no load with reduced specifications.
(2) Consult the Safe Operating Area curves, or contact the factory for the appropriate derating.
(3) If the remote sense ground is not used, pin 12 must be connected to pin13 for optimum output voltage accuracy.
External Capacitors:
The PT7778 requires a minimum output capacitance of 330碌F for proper operation. The PT7778 also requires an input capacitance of 2400碌F,
which must be rated for a minimum of 2.0Arms of ripple current. For transient or dynamic load applications, additional capacitance may be required. For further infor-
mation, see the accompanying application note on capacitor selection for this product.
Input Filter:
An input filter inductor is optional for most applications. The input inductor must be sized to handle 32ADC with a typical value of 1碌H.
For technical support and more information, see inside back cover or visit www.ti.com/powertrends
next
型號(hào)
版本
描述
廠商
下載
英文版
15 AMP HIGH-PERFORMANCE BIG HAMMER PROGRAMMABLE ISR
TI
英文版
15 AMP HIGH-PERFORMANCE BIG HAMMER PROGRAMMABLE ISR
TI [Texas ...
英文版
15 AMP HIGH-PERFORMANCE BIG HAMMER PROGRAMMABLE ISR
TI
英文版
15 AMP HIGH-PERFORMANCE BIG HAMMER PROGRAMMABLE ISR
TI [Texas ...
英文版
15 AMP HIGH-PERFORMANCE BIG HAMMER PROGRAMMABLE ISR
TI
英文版
15 AMP HIGH-PERFORMANCE BIG HAMMER PROGRAMMABLE ISR
TI [Texas ...
英文版
18 AMP “BIG-HAMMER” PROGRAMMABLE INTEGRATED SWITCHING REGU...
TI
英文版
18 AMP “BIG-HAMMER” PROGRAMMABLE INTEGRATED SWITCHING REGU...
TI [Texas ...
英文版
18 AMP “BIG-HAMMER” PROGRAMMABLE INTEGRATED SWITCHING REGU...
TI
英文版
18 AMP “BIG-HAMMER” PROGRAMMABLE INTEGRATED SWITCHING REGU...
TI [Texas ...
英文版
18 AMP “BIG-HAMMER” PROGRAMMABLE INTEGRATED SWITCHING REGU...
TI
英文版
18 AMP “BIG-HAMMER” PROGRAMMABLE INTEGRATED SWITCHING REGU...
TI [Texas ...
英文版
20 Amp Programmable Next Generation Big Hammer
TI
英文版
20 Amp Programmable Next Generation Big Hammer
TI [Texas ...
英文版
20 Amp Programmable Next Generation Big Hammer
TI
英文版
20 Amp Programmable Next Generation Big Hammer
TI [Texas ...
英文版
20-A Programmable Integrated Switching Regulator
TI [Texas ...
英文版
20 Amp 3.3V-Input Next Generation ＇Big Hammer＇ Programmabl...
ETC
英文版
20 Amp Programmable Next Generation ig hammer
英文版
20-A 1.8V to 2.55V 3.3V-Input Programmable ISR
ETC
1
2
3
