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参数资料
| 型号： | PT7778A |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 32 A SWITCHING REGULATOR, 400 kHz SWITCHING FREQ-MAX, SMA27 |
| 封装： | SIP-27 |
| 文件页数： | 1/4页 |
| 文件大小： | 177K |
| 代理商： | PT7778A |
For technical support and more information, see inside back cover or visit www.ti.com/powertrends
PT7778—3.3V
32 Amp Programmable Integrated
Switching Regulator
C
IN
+
C
OUT
+
LOAD
V
IN
VID0
VID1
VID2
VID3
V
OUT
GND
SYNC OUT
STBY*
L1
1H
REMOTE SENSE (–)
REMOTE SENSE (+)
PROGRAMMING PINS
PT7778
4321
26
20-25
12
5
13-19
27
7-11
Vo
Vin
GND
SNS ( + )
SNS(-)
Synch
Out
STBY
VID3 - VID0
Standard Application
Cin = Required 2400F electrolytic
Cout = Required 330F electrolytic
L1
= Optional 1H input choke
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
330F 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’s PentiumII Processors.
The 32A capability provides the
ideal power source for the industry’s
latest high-speed, low-voltage 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.
For STBY* pin; open = output enabled;
ground = output disabled.
Pin-Out Information
Pin
Function
1 VID0
2 VID1
3 VID2
4 VID3
5 STBY*- Stand-by
6 N/C
7 Vin
8 Vin
9 Vin
10 Vin
11 Vin
12 Remote Sense Gnd (3)
13 GND
14 GND
Pin
Function
15 GND
16 GND
17 GND
18 GND
19 GND
20 Vout
21 Vout
22 Vout
23 Vout
24 Vout
25 Vout
26 Remote Sense Vout
27 Sync Out
SLTS115
(Revised 8/31/2000)
Specifications
Characteristics
PT7778
(T
a = 25°C unless noted)
Symbols
Conditions
Min
Typ
Max
Units
Output Current
Io
Ta = +60°C, 200 LFM, pkg N
0.1 (1)
—32
A
Ta = +25°C, natural convection
0.1 (1)
—31
Input Voltage Range
Vin
0.1A
≤ Io ≤ 32A
3.1
—
3.6
V
Output Voltage Tolerance
Vo
Vin = +3.3V, Io = 32A
Vo-0.03
—
Vo+0.03
V
–40°C
≤ Ta ≤ +85°C
Line Regulation
Regline
3.1V
≤ Vin ≤ 3.6V, Io = 32A
—
±10
—
mV
Load Regulation
Regload
Vin = +3.3V, 0.1 ≤ Io ≤ 32A
—
±10
—
mV
Vo Ripple/Noise pk-pk
Vn
Vin = +3.3V, Io = 32A
—
50
—
mV
Transient Response
ttr
Io step between 16A and 32A
—
100
—
Sec
with Cout = 330F
Vos
Vo over/undershoot
—
200
—
mV
Efficiency
η
Vin = +3.3V, Io = 20A, Vo = 1.8V
—
90
—
%
Switching Frequency
o
3.1V
≤ Vin ≤ 3.6V
300
350
400
kHz
0.1A
≤ Io ≤ 32A
Absolute Maximum
Ta
Over Vin Range
–40
—
+85 (2)
°C
Operating Temperature Range
Storage Temperature
Ts
—
-40
—
+125
°C
Mechanical Vibration
Per Mil-STD-883D, Method 2007.2
—
10/15
—
G’s
20-20,000Hz, Soldered in a PC board
Weight
—
Vertical/Horizontal
—
53/66
—
grams
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 330F for proper operation. The PT7778 also requires an input capacitance of 2400F,
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 1H.
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