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參數(shù)資料
| 型號： | LTC1703 |
| 廠商： | Linear Technology Corporation |
| 元件分類： | 通用總線功能 |
| 英文描述： | Synchronous 8-Bit Up/Down Binary Counters 24-PDIP 0 to 70 |
| 中文描述： | 雙550kHz的同步二相開關穩(wěn)壓控制器5位VID |
| 文件頁數(shù)： | 8/36頁 |
| 文件大?。?/td> | 343K |
| 代理商： | LTC1703 |
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8
LTC1703
regulated output voltages as low as 800mV without exter-
nal level shifting amplifiers.
The LTC1703’s synchronous switching logic transitions
automatically into Burst Mode operation, maximizing effi-
ciency with light loads. An onboard overvoltage (OV) fault
flag indicates when an OV fault has occurred. The OV flag
can be set to latch the device off when an OV fault has
occurred, or to automatically resume operation when the
fault is removed.
2-Step Conversion
“2-step” architectures use a primary regulator to convert
the input power source (batteries or AC line voltage) to an
intermediate supply voltage, often 5V. This intermediate
voltage is then converted to the low voltage, high current
supplies required by the system using a secondary regu-
lator—the LTC1703. 2-step conversion eliminates the
need for a single converter that converts a high input
voltage to a very low output voltage, often an awkward
design challenge. It also fits naturally into systems that
continue to use the 5V supply to power portions of their
circuitry, or have excess 5V capacity available as newer
circuit designs shift the current load to lower voltage
supplies.
Each regulator in a typical 2-step system maintains a
relatively low step-down ratio (5:1 or less), running at high
efficiency while maintaining a reasonable duty cycle. In
contrast, a regulator taking a single step from a high input
voltage to a 1.xV output must run at a very narrow duty
cycle, mandating trade-offs in external component values
while compromising efficiency and transient response.
The efficiency loss can exceed that of using a 2-step
solution (see the 2-Step Efficiency Calculation section and
Figure 10). Further complicating the calculation is the fact
that many systems draw a significant fraction of their total
power off the intermediate 5V supply, bypassing the low
voltage supply. 2-step solutions using the LTC1703 usu-
ally match or exceed the total system efficiency of single-
step solutions, and provide the additional benefits of
improved transient response, reduced PCB area and sim-
plified power trace routing.
2-step regulation can buy advantages in thermal manage-
ment as well. Power dissipation in the LTC1703 portion of
a 2-step circuit is lower than it would be in a typical 1-step
Table 1. VID Inputs and Corresponding Output Voltage for
Channel 1
CODE
VID4
VID3
VID2
00000
GND
GND
00001
GND
GND
00010
GND
GND
00011
GND
GND
00100
GND
GND
00101
GND
GND
00110
GND
GND
00111
GND
GND
01000
GND
Float
01001
GND
Float
01010
GND
Float
01011
GND
Float
01100
GND
Float
01101
GND
Float
01110
GND
Float
01111*
GND
Float
VID1
GND
GND
Float
Float
GND
GND
Float
Float
GND
GND
Float
Float
GND
GND
Float
Float
VID0
GND
Float
GND
Float
GND
Float
GND
Float
GND
Float
GND
Float
GND
Float
GND
Float
V
OUT1
2.00V
1.95V
1.90V
1.85V
1.80V
1.75V
1.70V
1.65V
1.60V
1.55V
1.50V
1.45V
1.40V
1.35V
1.30V
1.25V
GND
GND
GND
GND
Float
Float
Float
Float
GND
GND
GND
GND
Float
Float
Float
Float
CODE
10000
10001
10010
10011
10100
10101
10110
10111
11000
11001
11010
11011
11100
11101
11110
11111*
VID4
Float
Float
Float
Float
Float
Float
Float
Float
Float
Float
Float
Float
Float
Float
Float
Float
VID3
GND
GND
GND
GND
GND
GND
GND
GND
Float
Float
Float
Float
Float
Float
Float
Float
VID2
GND
GND
GND
GND
Float
Float
Float
Float
GND
GND
GND
GND
Float
Float
Float
Float
VID1
GND
GND
Float
Float
GND
GND
Float
Float
GND
GND
Float
Float
GND
GND
Float
Float
VID0
GND
Float
GND
Float
GND
Float
GND
Float
GND
Float
GND
Float
GND
Float
GND
Float
V
OUT1
1.275V
1.250V
1.225V
1.200V
1.175V
1.150V
1.125V
1.100V
1.075V
1.050V
1.025V
1.000V
0.975V
0.950V
0.925V
0.900V
* 01111 and 11111 are defined by Intel to signify “no CPU.” The LTC1703
will generate the output voltages shown when these codes are selected.
APPLICATIOU
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| LTC1703CG#TRPBF | 功能描述:IC REG SW DUAL SYNC VID 28SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 標準包裝:43 系列:- 應用:控制器，Intel VR11 輸入電壓:5 V ~ 12 V 輸出數(shù):1 輸出電壓:0.5 V ~ 1.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:48-VFQFN 裸露焊盤 供應商設備封裝:48-QFN（7x7） 包裝:管件 |
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