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参数资料
型号： PTH08080WAS
厂商： TEXAS INSTRUMENTS INC
元件分类： 稳压器
英文描述： 2.25 A SWITCHING REGULATOR, 300 kHz SWITCHING FREQ-MAX, PDMA5
封装： ROHS COMPLIANT PACKAGE-5
文件页数： 2/17页
文件大小： 520K
代理商： PTH08080WAS
www.ti.com
Designing for Load Transients
PTH08080W
SLTS235C – FEBRUARY 2005 – REVISED FEBRUARY 2008
The transient response of the dc/dc converter has been characterized using a load transient with a di/dt of
1 A/s. The typical voltage deviation for this load transient is given in the data-sheet specification table using the
optional value of output capacitance. As the di/dt of a transient is increased, the response of a converter's
regulation circuit ultimately depends on its output capacitor decoupling network. This is an inherent limitation with
any dc/dc converter once the speed of the transient exceeds its bandwidth capability. If the target application
specifies a higher di/dt or lower voltage deviation, the requirement can only be met with additional output
capacitor decoupling. In these cases, special attention must be paid to the type, value, and ESR of the
capacitors selected.
If the transient performance requirements exceed those specified in the data sheet, the selection of output
capacitors becomes more important. Review the minimum ESR in the characteristic data sheet for details on the
capacitance maximum.
Table 3. Recommended Input/Output Capacitors
CAPACITOR CHARACTERISTICS
QUANTITY
85
°C
CAPACITOR VENDOR/
EQUIVALENT
VENDOR
WORKING
MAXIMUM
PHYSICAL
OUTPUT
COMPONENT
VALUE
SERIES
INPUT
NUMBER
VOLTAGE
RIPPLE
SIZE
BUS
SERIES
(F)
RESISTANCE
BUS(1)
(V)
CURRENT
(mm)
(Optional)
(ESR) (
)
(Irms) (mA)
Panasonic WA (SMT)
20
150
0.026
3700
10
× 10,2
1
≤ 2
EEFWA1D151P
FC (SMT)
25
220
0.150
670
10
× 10,2
1
EEVFC1E221P
Panasonic SL
6.3
47
0.018
2500
7,3
× 4,3
N/R(2)
≤ 3
EEFCD0J470R
SP-cap(SMT)
6.3
120
0.007
3500
7,3
× 4,3
N/R(2)
≤ 1
EEFSD0J121R
United Chemi-con PXA
16
150
0.026
3400
10
× 7,7
1
≤ 2
PXA16VC151MJ80TP
(SMT)
VI < 14 V
PS
25
100
0.020
4300
10
× 12,5
1
≤ 2
25PS100MJ12
LXZ
35
220
0.180
760
10
× 12,5
1
LXZ35VB221M10X12LL
MVZ (SMT)
25
470
0.090
670
10
×10
1
MVZ25VC471MJ10TP
Nichicon UWG (SMT)
35
100
0.150
670
10
× 10
1
UWG1V101MNR1GS
F559(Tantalum)
10
100
0.055
2000
7,7
× 4,3
N/R(3)
≤ 3
F551A107MN
HD
25
220
0.072
760
8
× 11,5
1
UHD1E221MPR
Sanyo Os-con\ POS-Cap
10
68
0.025
2400
7,3
× 4,3
N/R(2)
≤ 2
10TPE68M
SVP (SMT)
20
150
0.020
4320
10
× 12,7
1
≤ 1
20SVP150M
SP
20
120
0.024
3110
8
× 10,5
1
≤ 2
20SP120M
AVX Tantalum TPS (SMD)
35
47
0.100
1430
7,3
× 4,3 ×
2
≤ 4
TPSV476M035R0100
25
47
0.100
1150
4,1
2
≤ 4
TPSE476M025R0100
7,3
× 4,3 ×
VI < 13 V
4,1
Kemet T520 (SMD)
10
100
0.025
> 2000
7,3
× 5,7 × 4
N/R(2)
≤ 1
T520V107M010ASE025
AO-CAP
6.3
100
0.018
> 2900
7,3
× 5,7 × 4
N/R(2)
≤ 1
A700V107M006AT
Vishay/Sprague
35
47
0.280
> 1000
7,3
× 6 × 4,1
2
≤ 5
595D476X0035R2T
594D/SVP(SMD)
20
100
0.025
3200
8
× 12
1
≤ 2
94SVP107X0020E12
94SS
20
150
0.030
3200
10
× 10,5
1
≤ 2
94SS157X0020FBP
Murata Ceramic X5R
16
47
0.002
> 1400
3225
1 (4)
≤ 3
GRM32ER61C476M
VI < 14 V
TDK ceramic X5R
6.3
47
0.002
> 1400
3225
N/R(2)
≤ 3
C3225X5R0J476MT
VO < 5.5 V
Kemet Ceramic X5R
6.3
47
0.002
> 1400
3225
N/R(2)
≤ 3
C1210C476K9PAC
VO < 5.5 V
TDK Ceramic X7R
25
10
0.002
> 1400
3225
1(4)
≤ 4
C3225X7R1E106K
Murata Ceramic X5R
25
10
0.002
> 1400
1(4)
≤ 4
GRM32DR61E106KA12
Kemet
16
10
0.002
> 1400
1(4)
≤ 4
C1210C106M4PAC
VI < 14 V
TDK Ceramic X7R
25
2.2
0.002
> 1400
3225
1
C3225X7R1E225KT/MT
Murata Ceramic X7R
25
2.2
0.002
> 1400
1
GRM32RR71J225KC01L
Kemet
25
2.2
0.002
> 1400
1
C1210C225K3RAC
(1)
The voltage rating of the input capacitor must be selected for the desired operating input voltage range of the regulator. To operate the
regulator at a higher input voltage, select a capacitor with a higher voltage rating.
(2)
Not recommended (N/R). The voltage rating of this capacitor only allows it to be used for output voltages bus and voltage of < 5.5 V.
(3)
The voltage rating of the input capacitor must be selected for the desired operating input voltage range of the regulator. To operate the
regulator at a higher input voltage, select a capacitor with a higher voltage rating.
(4)
Ceramic capacitors can be used to complement electrolytic types at the input bus by reducing high-frequency ripple current.
10
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Copyright 2005–2008, Texas Instruments Incorporated
Product Folder Link(s) :PTH08080W
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PTH08080WAST 功能描述:DC/DC转换器 2.25A Wide Input/ Out Adj Mini Pwr Mdl RoHS:否 制造商:Murata 产品: 输出功率: 输入电压范围:3.6 V to 5.5 V 输入电压（标称）: 输出端数量:1 输出电压（通道 1）:3.3 V 输出电流（通道 1）:600 mA 输出电压（通道 2）: 输出电流（通道 2）: 安装风格:SMD/SMT 封装 / 箱体尺寸:
PTH08080WAZ 功能描述:DC/DC转换器 2.25A Wide Input/ Out Adj Mini Pwr Mdl RoHS:否 制造商:Murata 产品: 输出功率: 输入电压范围:3.6 V to 5.5 V 输入电压（标称）: 输出端数量:1 输出电压（通道 1）:3.3 V 输出电流（通道 1）:600 mA 输出电压（通道 2）: 输出电流（通道 2）: 安装风格:SMD/SMT 封装 / 箱体尺寸:
PTH08080WAZT 功能描述:DC/DC转换器 2.25A Wide Input/ Out Adj Mini Pwr Mdl RoHS:否 制造商:Murata 产品: 输出功率: 输入电压范围:3.6 V to 5.5 V 输入电压（标称）: 输出端数量:1 输出电压（通道 1）:3.3 V 输出电流（通道 1）:600 mA 输出电压（通道 2）: 输出电流（通道 2）: 安装风格:SMD/SMT 封装 / 箱体尺寸:
PTH08080WBH 功能描述:DC/DC转换器 2.25A,4.5-18Vin Wide Adjust Mini Pwr Mod RoHS:否 制造商:Murata 产品: 输出功率: 输入电压范围:3.6 V to 5.5 V 输入电压（标称）: 输出端数量:1 输出电压（通道 1）:3.3 V 输出电流（通道 1）:600 mA 输出电压（通道 2）: 输出电流（通道 2）: 安装风格:SMD/SMT 封装 / 箱体尺寸:
PTH08082WAS 制造商:Texas Instruments 功能描述:
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