參數(shù)資料
型號： LTC1873EG
廠商： LINEAR TECHNOLOGY CORP
元件分類： 穩(wěn)壓器
英文描述： Quadruple 2-Input Positive-AND Gate 14-TSSOP -40 to 85
中文描述： 5 A SWITCHING CONTROLLER, 750 kHz SWITCHING FREQ-MAX, PDSO28
封裝： 0.209 INCH, PLASTIC, SSOP-28
文件頁數(shù)： 8/32頁
文件大?。?/td> 308K
代理商： LTC1873EG
8
LTC1873
allows regulated output voltages as low as 800mV without
external level shifting amplifiers.
The LTC1873’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-Phase Operation
The LTC1873 dual switching regulator controller offers
considerable benefits using 2-phase operation. Circuit
benefits include lower input filtering requirements,
reduced electromagnetic interference (EMI) and increased
efficiency associated with 2-phase operation.
Why the need for 2-phase operation Until recently, con-
stant-frequency dual switching regulators operated both
channels in phase (i.e., single-phase operation). This
means that both topside MOSFETs turned on at the same
time, causing current pulses of up to twice the amplitude
of those for one regulator to be drawn from the input
capacitor. These large amplitude current pulses increased
the total RMS current flowing from the input capacitor,
requiring the use of more expensive input capacitors and
increasing both EMI and losses in the input capacitor and
input power supply.
With 2-phase operation, the two channels of the LTC1873
are operated 180 degrees out of phase. This effectively
interleaves the current pulses coming from the switches,
greatly reducing the overlap time where they add together.
The result is a significant reduction in total RMS input
current, which in turn allows less expensive input capaci-
tors to be used, reduces shielding requirements for EMI
and improves real world operating efficiency.
Figure 7 shows example waveforms for a single switching
regulator channel versus a 2-phase LTC1873 system with
both sides switching. A single-phase dual regulator with
both sides operating would exhibit double the single side
numbers. In this example, 2-phase operation reduced the
RMS input current from 9.3A
RMS
(2
×
4.66A
RMS
) to
4.8A
RMS
. While this is an impressive reduction in itself,
remember that the power losses are proportional to I
RMS2
,
meaning that the actual power wasted is reduced by a
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
* 11111 is defined by Intel to signify “no CPU.” The LTC1873
will generate the output voltage shown when this codes is selected.
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
2.05V
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
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
3.50V
3.40V
3.30V
3.20V
3.10V
3.00V
2.90V
2.80V
2.70V
2.60V
2.50V
2.40V
2.30V
2.20V
2.10V
2.00V
APPLICATIOU
W
U
U
相關PDF資料
PDF描述
LTC1873 Dual 550kHz Synchronous 2-Phase Switching Regulator Controller with 5-Bit VID(550kHz,雙 路,同步2相開關穩(wěn)壓器(帶5位VID))
LTC1874 Dual Constant Frequency Current Mode Step-Down DC/DC Controller(雙路(3.3V,1.8V輸出）恒定頻率，電流模式，步降DC/DC控制器)
LTC1874EGN Quadruple 2-Input Positive-AND Gate 14-VQFN -40 to 85
LTC1875 15mA Quiescent Current 1.5A Monolithic Synchronous Step-Down Regulator
LTC1875EGN 15mA Quiescent Current 1.5A Monolithic Synchronous Step-Down Regulator
相關代理商/技術參數(shù)
參數(shù)描述
LTC1873EG#PBF 功能描述:IC REG CTRLR BUCK PWM VM 28-SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標準包裝:4,500 系列:PowerWise® PWM 型:控制器 輸出數(shù):1 頻率 - 最大:1MHz 占空比:95% 電源電壓:2.8 V ~ 5.5 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:6-WDFN 裸露焊盤 包裝:帶卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名稱:LM1771SSDX
LTC1873EG#TR 功能描述:IC REG CTRLR BUCK PWM VM 28-SSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標準包裝:4,500 系列:PowerWise® PWM 型:控制器 輸出數(shù):1 頻率 - 最大:1MHz 占空比:95% 電源電壓:2.8 V ~ 5.5 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:6-WDFN 裸露焊盤 包裝:帶卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名稱:LM1771SSDX
LTC1873EG#TRPBF 功能描述:IC REG CTRLR BUCK PWM VM 28-SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標準包裝:4,500 系列:PowerWise® PWM 型:控制器 輸出數(shù):1 頻率 - 最大:1MHz 占空比:95% 電源電壓:2.8 V ~ 5.5 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:6-WDFN 裸露焊盤 包裝:帶卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名稱:LM1771SSDX
LTC1874EGN 功能描述:IC REG CTRLR BUCK PWM CM 16-SSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標準包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:96% 電源電壓:4 V ~ 36 V 降壓:無 升壓:是 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:24-WQFN 裸露焊盤 包裝:帶卷 (TR)
LTC1874EGN#PBF 功能描述:IC REG CTRLR BUCK PWM CM 16-SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標準包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:96% 電源電壓:4 V ~ 36 V 降壓:無 升壓:是 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:24-WQFN 裸露焊盤 包裝:帶卷 (TR)
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