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參數(shù)資料
| 型號(hào)： | TPS6205 |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | 800-mA SYNCHRONOUS STEP-DOWN CONVERTER |
| 中文描述： | 800毫安同步降壓轉(zhuǎn)換器 |
| 文件頁數(shù)： | 14/21頁 |
| 文件大小： | 432K |
| 代理商： | TPS6205 |
www.ti.com
LBI
ENABLE
LBO
VIN
Bandgap
LBI
Comparator
Enable to Internal Circuitry
FB
PG
VIN
8
LBO
GND
3
SYNC
EN
LBI
PGND
10
TPS62051
SW
1
6
7
2
9
5
4
R3
R4
R1
R2
R5
R6
R7
1 Cell Li-lon
C
i
= 10
μ
F
L1 = 10
μ
H
V
O
= 2.5 V / 600 mA
C
o
= 22
μ
F
C
(ff)
=
6.8 pF
TPS62050, TPS62051
TPS62052, TPS62054, TPS62056
SLVS432D–SEPTEMBER 2002–REVISED OCTOBER 2003
APPLICATION INFORMATION (continued)
ENABLE/Low-Battery Detector (Enhanced Version) TPS62051 Only
The TPS62051 offers an enhanced LBI functionality to provide a precise, user programmable undervoltage
shutdown. No additional supply voltage supervisor (SVS) is needed to provide this function.
When the enable (EN) pin is pulled high, only the internal bandgap voltage reference is switched on to provide a
reference source for the LBI comparator. As long as the voltage at LBI is less than the LBI trip point, all other
internal circuits are shut down, reducing the supply current to 5 μA. As soon as input voltage at LBI rises above
the LBI trip point of 1.21 V, the device is completely enabled and starts switching.
Figure 19. Block Diagram of ENABLE/LBI Functionality for TPS62051
The logic level of the LBO pin is not defined for the first 500 μs after EN is pulled high.
When the enhanced LBI is used to supervise the battery voltage and shut down the TPS62051 at low input
voltages, the battery voltage rises again when the current drops to zero. The implemented hysteresis on the LBI
pin may not be sufficient for all types of batteries. Figure 20 shows how an additional external hysteresis can be
implemented.
Figure 20. Enhanced LBI With Increased Hysteresis
A MATHCAD file to calculate R7 can be downloaded from the product folder on the TI web.
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| TPS62050DGS | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 Adj 800mA 10V Vin Step-Down Converter RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| TPS62050DGSG4 | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 Adj 800mA 10V Vin Step-Down Converter RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| TPS62050DGSR | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 Adj 800mA 10V Vin Step-Down Converter RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| TPS62050DGSR | 制造商:Texas Instruments 功能描述:DC/DC Converter IC |
| TPS62050DGSRG4 | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 Adj 800mA 10V Vin Step-Down Converter RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT |
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