PT7742-3.3V [TI]
Current Booster;
| 型号： | PT7742-3.3V |
| 厂家： | 
TEXAS INSTRUMENTS |
| 描述： | Current Booster |
| 文件： | 总3页 (文件大小：382K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
PT7742—3.3V
20 Amp “Current Booster” for PT7708
Integrated Switching Regulator
SLTS085
(Revised 6/30/2000)
Description
parallel output stage that is driven di-
rectly by the regulator. This allows
the system to run in perfect synchron-
ization to provide a low noise solution.
The PT7742 only operates in com-
bination with a PT7708 series regulator,
and is not a stand-alone product. Please
refer to the PT7708 data sheet for the
performance specifications.
The PT7742 is a 20 Amp “Current
Booster” for the PT7708 housed in the
same 27-pin SIP package.
Multiple PT7742 boosters will
operate in parallel with one PT7708
product, boosting output current in
increments of 20A. Combinations of a
PT7708 regulator and PT7742 current
boosters can supply power for virtually
any multiple mega-processor applica-
tion.
The booster uses the same 27-pin
case and has the same package options
as its companion regulator.
A PT7742 current booster adds a
Pin-Out Information
Ordering Information
PT7742❏
Pin Function
Pin Function
14 GND
15 GND
16 GND
17 GND
18 GND
19 GND
20 Vout
(For dimensions and PC Board layout, see
Package Styles 800 and 810.)
1
2
3
4
5
6
7
8
9
Do not connect
Do not connect
Do not connect
Do not connect
Do not connect
Do not connect
Vin
Features
• 20A Current Boost
• Tracks Vo of a PT7708
• High Efficiency
• Input Voltage Range:
3.1V to 3.6V
PT Series Suffix
(PT1234X)
Case/Pin
Configuration
Vertical Through-Hole
N
A
C
Vin
21 Vout
• Synchronized with PT7708
• 27-pin SIP Package
• Connect up to 2 in Parallel for
60 Amps
Horizontal Through-Hole
Vin
22 Vout
Horizontal Surface Mount
10 Vin
23 Vout
11 Vin
24 Vout
12 Do not connect
13 GND
25 Vout
26 Do not connect
27 Master Sync In
Standard Application
PROGRAMMING PINS
REMOTE SENSE (+)
VID0
VID1
VID2
VID3
4
VID3
3
-
2
VID0
1
26
SNS(+)
VOUT
L1
7-11
20-25
Vo
Vin
VIN
PT7708
1 H
Synch
Out
STBY
5
GND
SNS(-)
+
+
LOAD
27
13-19 12
CIN
COUT
GND
GND
STBY*
REMOTE SENSE
( )
27
Synch
In
L1
7-11
20-25
Vo
Vin
PT7742
1 H
GND
+
+
13-19
CIN
COUT
External Capacitors: The PT7742 requires a minimum ouput capacitance of 330µF for proper operation. The PT7742 also requires an input capacitance of
1500µF, which must be rated for a minimum of 1.4Arms of ripple current. For transient or dynamic load applications additional capacitance may be required.
For more information refer to the application note regarding capacitor selection for this product.
Input Filter: An input filter inductor is optional for most applications. The inductor must be sized to handle 20ADC with a typical value of 1µH.
For technical support and more information, see inside back cover or visit www.ti.com/powertrends
Application Notes
PT7708/PT7709, PT7742/PT7743
Tantalum Characteristics
Capacitor Recommendations for the PT7708/09
Regulators and PT7742/43 Current Boosters
Tantalum capacitors with a minimum 10V rating are
recommended on the output bus, but only the AVX TPS
Series, Sprague 594/595 Series, or Kemet T495/T510 Series.
The AVX TPS Series, Sprague Series or Kemet Series
capacitors are specified over other types due to their
higher surge current, excellent power dissipation and ripple
current ratings. As an example, the TAJ Series by AVX is
not recommended. This series exhibits considerably higher
ESR, reduced power dissipation and lower ripple current
capability. The TAJ Series is a less reliable compared to
the TPS series when determining power dissipation capability.
Input Capacitors
The recommended input capacitance is determined by
1.4 ampere minimum ripple current rating and 1500µF
minimum capacitance. Capacitors listed below must be
rated for a minimum of 2x the input voltage with +5V
operation. Ripple current and ≤100mΩ Equivalent Series
Resistance (ESR) values are the major considerations along
with temperature when selecting the proper capacitor.
Output Capacitors
Capacitor Table
The minimum required output capacitance is 330µF with
a maximum ESR less than or equal to 100mΩ. Failure to
observe this requirement may lead to regulator instability
or oscillation. Electrolytic capacitors have poor ripple per-
formance at frequencies greater than 400kHz, but excellent
low frequency transient response. Above the ripple fre-
quency ceramic decoupling capacitors are necessary to
improve the transient response and reduce any microproces-
sor high frequency noise components apparent during
higher current excursions. Preferred low ESR type capaci-
tor part numbers are identified in the Table 1 below.
Table 1 identifies the characteristics of capacitors from a
number of vendors with acceptable ESR and ripple current
(rms) ratings. The suggested minimum quantities per regu-
lator for both the input and output buses are identified.
This is not an extensive capacitor list. The table below is a
selection guide for input and output capacitors. Other capacitor
vendors are available with comparable RMS ripple current rating
and ESR (Equivalent Series Resistance at 100kHz). These
critical parameters are necessary to insure both optimum regulator
performance and long capacitor life.
Table 1 Capacitors Characteristic Data
Capacitor
Vendor/
Series
Capacitor Characteristics
Quantity
Working
Voltage
Value(µF)
(ESR) Equivalent
Series Resistance
105°C Maximum
Ripple
Physical
Size(mm)
Input
Bus
Output
Bus
Vendor Number
Current(Irms)
Panasonic
FC
16V
35V
2200
330
2000mA
1205mA
18x16.5
1
1
1
1
1
EEVFC1C222N
0.038Ω
0.065Ω
12.5x16.5
EEVFC1V331LQ
Surface Mtg
FA
10V
16V
680
755mA
10x12.5
18x15
1
1
EEUFA1A681
0.090Ω
0.032Ω
1800
2000mA
EEUFA1C182A
United
25V
16V
16V
330
2200
470
0.084Ω
0.038Ω
825mA
1630mA
825mA x2
10x16
16x20
10x16
1
1
1
LXV25VB331M10X16LL
LXV16VB222M16X20LL
LXV16VB471M10X16LL
Chemi -Con
LFVSeries
0.084Ω/2=042Ω
Nichicon
PL Series
PM Series
10V
10V
25V
680
1800
330
0.090Ω
0.044Ω
0.095Ω
770mA
1420mA
750mA
10x15
16x15
10x15
1
1
1
UPL1A681MHH6
UPL1A182MHH6
UPL1E331MPH6
1
Oscon SS
SV
10V
10V
330
330
0.025W/4=0.006Ω
0.020/4=0.005Ω
>9800mA
>9800mA
10x10.5
4
4
N/R
10SS330M
10.3x12.6
(Note) 10SV330M(Sufvace Mtg
AVX
10V
10V
330
330
0.100/5=20Ω
0.060Ω
3500mA
1826mA
7.3Lx
4.3Wx
4.1H
5
5
1
1
TPSV337M010R0100
TPSV337M010R0060
Tanatalum
TPS- Series
Sprague
10V
10V
330
680
0.045W/4=0.011Ω
0.090Ω
>4500mA
>1660mA
7.3L x
5.7W x
4.0H
5
2
1
1
594D337X0010R2T
Surface Mount
Tantalum
595D/594D
595D687X0010R2T
Kemet
10V
10V
330
220
0.035Ω
2000mA
4.3Wx7.3L
x4.0H
5
6
1
2
510X337M010AS
Tantalum
T510/T495
Series
0.070Ω/2=0.035Ω
>2000mA
T495X227M010AS
Surface Mount
Sanyo Poscap
TPB
10V
220
0.040Ω
3000mA
7.2L x
4.3W x
3.1H
6
2
10TPB220M
Surface Mount
Note: (N/R) is not recommended for this application, due to extremely low Equivalent Series Resistance (ESR)
For technical support and more information, see inside back cover or visit www.ti.com/powertrends
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