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PT7777N

更新时间： 2024-01-11 04:16:45
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德州仪器 - TI 模拟IC
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3页 181K
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Analog IC

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PT7777N 数据手册

 浏览型号PT7777N的Datasheet PDF文件第2页浏览型号PT7777N的Datasheet PDF文件第3页 
For assistance or to order, call (800) 531-5782  
S e r i e s  
P T 7 7 7 7  
32 AMP HIGH-PERFORMANCE  
“SLEDGE HAMMER” PROGRAMMABLE ISR  
Revised 7/31/98  
The PT7777 is a new series of  
can be easily programmed from 1.3V  
high-performance, 32 Amp Inte-  
grated Switching Regulators (ISRs)  
housed in a 27-pin SIP package.  
The 32A capability allows easy  
integration of the latest high-speed,  
low-voltage µPs, ASICs, DSPs, and  
bus drivers into existing 5V systems.  
The output voltage of the PT7777  
to 3.5V with a 5 bit input compatible  
with Intel’s Pentium Pro Processor. A  
differential remote sense is also pro-  
vided which automatically compensates  
for any voltage drop from the ISR  
to the load.  
680µF of output capacitance  
is required for proper operation.  
Pin-Out Information  
Pin Function  
Pin Function  
14 GND  
15 GND  
16 GND  
17 GND  
Standard Application  
PROGRAMMING PINS  
1
2
3
4
5
6
7
8
VID0  
VID1  
VID0  
VID1  
VID2  
VID3  
VID4  
VID2  
REMOTE SENSE (+)  
VID3  
6
4
3
2
1
26  
STBY*- Stand-by  
18 GND  
19 GND  
L1  
VID4  
Vin  
VIN  
VOUT  
7 - 11  
20 - 25  
PT7777  
1µH  
20  
21  
22  
23  
24  
25  
V
V
V
V
V
V
out  
out  
out  
out  
out  
out  
Vin  
27  
13 - 19  
5
12  
+
+
9
Vin  
CIN  
COUT  
LOAD  
10 Vin  
11 Vin  
12 Remote Sense Gnd  
13 GND  
SYNC OUT  
GND  
GND  
STBY*  
26 Remote Sense V  
27 Sync Out  
REMOTE SENSE (-)  
out  
C
C
L1  
=
Required 2400µF electrolytic  
in  
out  
= Required 680µF electrolytic  
=
For STBY* pin; open = output enabled;  
ground = output disabled.  
Optional 1µH input choke  
Specifications  
PT7777 SERIES  
Characteristics  
(T a = 25°C unless noted)  
Symbols  
Conditions  
Min  
Typ  
Max  
Units  
(1)  
Output Current  
Io  
Ta = +60°C, 200 LFM, pkg N  
Ta = +25°C, natural convection  
0.1  
0.1  
—
—
32  
26  
A
A
(1)  
(2)  
Input Voltage Range  
Vin  
0.1A ≤ Io ≤ 32A  
4.5  
—
5.5  
V
Output Voltage Tolerance  
∆Vo  
Vin = +5V, Io = 32A  
0°C ≤ Ta ≤ +55°C  
Vo-0.03  
—
Vo+0.03  
V
Line Regulation  
Regline  
Regload  
Vn  
4.5V ≤ Vin ≤ 5.5V, Io = 32A  
Vin = +5V, 0.1 ≤ Io ≤ 32A  
Vin = +5V, Io = 32A  
—
—
—
±10  
±10  
50  
—
—
—
mV  
mV  
mV  
Load Regulation  
Vo Ripple/Noise pk-pk  
Transient Response  
with Cout = 680µF  
ttr  
Vos  
Io step between 16A and 32A  
Vo over/undershoot  
—
—
100  
200  
—
—
µSec  
mV  
Efficiency  
η
Vin = +5V, Io = 20A, Vo = 3.3V  
—
90  
—
%
Switching Frequency  
ƒo  
4.5V ≤ Vin ≤ 5.5V  
0.1A ≤ Io ≤ 32A  
650  
700  
750  
kHz  
Absolute Maximum  
Ta  
—
0
0
—
—
+85  
+65  
°C  
°C  
Operating Temperature Range  
Recommended Operating  
Temperature Range  
Ta  
Forced Air Flow = 200 LFM  
Over Vin  
—
Io Ranges  
and  
Storage Temperature  
Weight  
Ts  
—
-40  
—
—
+125  
—
°C  
Vertical/Horizontal  
53/66  
grams  
(1) ISR-will operate down to no load with reduced specifications. Please note that this product is not short-circuit protected.  
(2) The minimum input voltage is 4.5V or Vout+1.2V, whichever is greater.  
Output Capacitors: The PT7777 series requires a minimum output capacitance of 680µF for proper operation. Do not use Oscon type capacitors.  
The maximum allowable output capacitance is 30,000µF.  
Input Filter: An input filter is optional for most applications. The input inductor must be sized to handle 32ADC with a typical value of 1µH.  
The input capacitance must be rated for a minimum of 2.6Arms of ripple current. For transient or dynamic load applications, additional  
capacitance may be required.  
Power Trends, Inc. 27715 Diehl Road, Warrenville, IL 60555 (800) 531-5782 Fax: (630) 393-6902 http://www.powertrends.com  
123

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