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参数资料
| 型号： | LTC3838EFE#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 17/54页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM CM 38TSSOP |
| 标准包装： | 2,000 |
| 系列： | PolyPhase® |
| PWM 型： | 电流模式 |
| 输出数： | 2 |
| 频率 - 最大： | 2MHz |
| 电源电压： | 4.5 V ~ 38 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -40°C ~ 125°C |
| 封装/外壳： | 38-TFSOP （0.173"，4.40mm 宽）裸露焊盘 |
| 包装： | 带卷 (TR) |
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LTC3838
OPERATION (Refer to Functional Diagram)
The system can be configured for up to 12-phase opera-
tion with a multichip solution. Typical configurations are
shown in Table 2 to interleave the phases of the channels.
externally for single-output applications. Set PHASMD
to SGND or FLOAT so that the two channels are 180°
out-of-phase. Efficiency losses may be substantially
Table 1
PHASMD
Channel 1
Channel 2
CLKOUT
SGND
0°
180°
60°
FLOAT
0°
180°
90°
INTV CC
0°
240°
120°
reduced because the peak current drawn from the input
capacitor is effectively divided by the number of phases
used and power loss is proportional to the RMS current
squared. A 2-phase implementation can reduce the input
path power loss by up to 75%.
To make a single-output converter of three or more phases,
Table 2
NUMBER OF
PHASES
2
3
4
6
12
NUMBER OF
LTC3838
1
2, or 1 +
LTC3833
2
3
6
PIN CONNECTIONS
[PIN NAME (CHIP NUMBER)]
PHASMD(1) = FLOAT or SGND
PHASMD(1) = INTV CC
MODE/PLLIN(2) = CLKOUT(1)
PHASMD(1) = FLOAT
PHASMD(2) = FLOAT or SGND
MODE/PLLIN(2) = CLKOUT(1)
PHASMD(1) = SGND
PHASMD(2) = SGND
MODE/PLLIN(2) = CLKOUT(1)
PHASMD(3) = FLOAT or SGND
MODE/PLLIN(3) = CLKOUT(2)
PHASMD(1) = SGND
PHASMD(2) = SGND
MODE/PLLIN(2) = CLKOUT(1)
PHASMD(3) = FLOAT
MODE/PLLIN(3) = CLKOUT(2)
PHASMD(4) = SGND
MODE/PLLIN(4) = CLKOUT(3)
PHASMD(5) = SGND
MODE/PLLIN(5) = CLKOUT(4)
PHASMD(6) = FLOAT or SGND
MODE/PLLIN(6) = CLKOUT(5)
additional LTC3838 or LTC3833 chips can be used. The first
chip should be tied the same way as the 2-phase above. If
only one more channel of an additional LTC3838 is needed,
use Channel 1 for the additional phase:
? Tie the ITH1 pin to the ITH1 pin of the first chip
? Tie the RUN1 pin to the RUN pins of the first chip
? Tie the V OUTSENSE1+ pin to the V OUTSENSE1+ pin of the
first chip
? Tie the V OUTSENSE1– pin to the V OUTSENSE1– pin of the
first chip
? Tie the TRACK/SS1 pin to the TRACK/SS1 pin of the
first chip
If both channels are needed, the additional LTC3838 chip
should be tied the same way as the first LTC3838 chip to
disable the second channel’s EA:
? Tie the V FB2 pin to the chip’s own INTV CC
? Tie the ITH1 pin to the ITH1 pin of the first chip
? Tie the RUN pins to the RUN pins of the first chip
Single-Output PolyPhase Configurations
To use LTC3838 for a 2-phase single output step-down
controller: Tie the V FB2 pin to INTV CC , which will disable
Channel 2’s error amplifier and internally connect ITH2 to
ITH1. Tie the compensation R-C components to the ITH1
pin. The ITH2 pin can be either left open or shorted to ITH1
externally. The TRACK/SS2 and PGOOD2 pins become
? Tie the V OUTSENSE1+ pin to the V OUTSENSE1+ pin of the
first chip
? Tie the V OUTSENSE1– pin to the V OUTSENSE1– pin of the
first chip
? Tie the TRACK/SS1 pin to the TRACK/SS1 pin of the
first chip
defunct and can be left open. Note that the RUN1, RUN2,
DTR1, DTR2, VRNG1 and VRNG2 pins still function for
the two channels individually, therefore should be shorted
3838fa
17
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC3838EUHF#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 38-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:PolyPhase® 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:24-WQFN 裸露焊盘 包装:带卷 (TR) |
| LTC3838EUHF#TRPBF | 功能描述:IC REG CTRLR BUCK PWM CM 38-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:PolyPhase® 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:24-WQFN 裸露焊盘 包装:带卷 (TR) |
| LTC3838EUHF-1#PBF | 制造商:Linear Technology 功能描述:IC REG CTRLR BUCK PWM CM 38QFN 制造商:Linear Technology 功能描述:BUCK DUAL CNTRL 4.5-38V 2MHZ 38QFN 制造商:Linear Technology 功能描述:BUCK, DUAL, CNTRL, 4.5-38V, 2MHZ, 38QFN 制造商:Linear Technology 功能描述:DC-DC CONTROLLER, DUAL, BUCK, ADJ, QFN-38, Primary Input Voltage:38V, No. of Outputs:2, Output Current:25A, No. of Pins:38, Operating Temperature Min:-40C, Operating Temperature Max:125C, MSL:MSL 1 - Unlimited , RoHS Compliant: Yes 制造商:Linear Technology 功能描述:DP-SWREG/Controller, Dual, Fast, Accurate Step-Down Controller with Differential |
| LTC3838EUHF-1#TRPBF | 制造商:Linear Technology 功能描述:IC REG CTRLR BUCK PWM CM 38QFN 制造商:Linear Technology 功能描述:DC-DC CONTROLLER, DUAL, BUCK, ADJ, QFN-38, Primary Input Voltage:38V, No. of Outputs:2, Output Current:25A, No. of Pins:38, Operating Temperature Min:-40C, Operating Temperature Max:125C, MSL:MSL 1 - Unlimited , RoHS Compliant: Yes 制造商:Linear Technology 功能描述:DP-SWREG/Controller, Dual, Fast, Accurate Step-Down Controller with Differential |
| LTC3838EUHF-2#PBF | 制造商:Linear Technology 功能描述:DC DC Cntrlr Dual-OUT Sync Step Down 4.5V to 38V Input 38-Pin QFN EP 制造商:Linear Technology 功能描述:IC REG CTRLR BUCK PWM CM 38-QFN 制造商:Linear Technology 功能描述:DC-DC CONTROLLER BUCK 2MHZ QFN-38 制造商:Linear Technology 功能描述:BUCK DUAL CNTRL 4.5-38V 2MHZ 38QFN 制造商:Linear Technology 功能描述:DC-DC CONTROLLER, BUCK, 2MHZ, QFN-38 制造商:Linear Technology 功能描述:DC-DC CONTROLLER, BUCK, 2MHZ, QFN-38, Primary Input Voltage:38V, No. of Outputs:2, No. of Pins:38, Operating Temperature Min:-40C, Operating Temperature Max:125C, MSL:MSL 1 - Unlimited, Package / Case:38-QFN , RoHS Compliant: Yes 制造商:Linear Technology 功能描述:DP-SWREG/Controller, Dual, Fast, Accurate Step-Down Controller with Differential |
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