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参数资料
| 型号： | LTC3634IFE#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 20/28页 |
| 文件大小： | 0K |
| 描述： | IC CONV DDR DDR2 DDR3 28TSSOP |
| 标准包装： | 2,500 |
| 应用： | 转换器，DDR，DDR2，DDR3 |
| 输入电压： | 1.4 V ~ 15 V |
| 输出数： | 2 |
| 输出电压： | 0.6 V ~ 3 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-SOIC（0.173"，4.40mm 宽）裸露焊盘 |
| 供应商设备封装： | 28-TSSOP 裸露焊盘 |
| 包装： | 带卷 (TR) |
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LTC3634
APPLICATIONS INFORMATION
2-Phase, Single V TT Output Configuration
The two regulators on the LTC3634 can be easily com-
bined to provide a single 2-phase V TT termination supply
capable of sourcing and sinking up to 6A. The circuit is
shown in Figure 7.
In this circuit, V FB1 is tied to INTV CC to put the LTC3634
into 2-phase operation. When set up for 2-phase operation,
the inputs to channel 1’s transconductance error amplifier
are switched to be the same as channel 2’s inputs (V FB2
and VTTR), allowing it to be paralleled with channel 2’s
error amplifier. The ITH1 and ITH2 pins should be tied
together externally to force equal current sharing between
both channels.
Only one compensation network is needed on the ITH
node, although separate filter caps for each ITH pin may
be helpful depending on the board layout. In this parallel
configuration, it is important to note that the effective
g m(EA) and g m(MOD) are twice as large as that of a single
channel.
One advantage to this 2-phase configuration is that both
input and output current ripple is significantly reduced
compared to a single phase 6A converter solution, because
the current waveforms from each regulator are interleaved.
Refer to Application Note 77 for a full discussion and
analysis on PolyPhase ? converters.
V IN1 and V IN2 may be powered from separate supply volt-
ages (see Figure 12). This is useful in cases where power
needs to be shared between two different sources. It is
important to note that when the V TT output sinks current,
it will backfeed through the converter and out of the V IN
pins. Care must be taken to ensure that the input supplies
are able to handle this condition.
Efficiency Considerations
The percent efficiency of a switching regulator is equal to
the output power divided by the input power times 100%.
It is often useful to analyze individual losses to determine
what is limiting the efficiency and which change would
produce the most improvement. Percent efficiency can
be expressed as:
% Efficiency = 100% – (L1 + L2 + L3 +…)
where L1, L2, etc. are the individual losses as a percentage
of input power. Although all dissipative elements in the
circuit produce losses, three main sources usually account
for most of the losses in LTC3634 circuits: 1) conduction
losses, 2) switching losses and quiescent power loss 3)
transition losses and other losses.
RT
V IN
3.6V TO 15V
R1
160k
C1
47μF
× 2
C2
2.2μF
RUN1
RUN2
INTV CC
PHMODE
V FB1
V IN2 V IN1
LTC3634
BOOST1
SW1
BOOST2
SW2
0.1μF
0.1μF
L1
0.47μH
L2
0.47μH
V TT
V DDQ /2 AT ±6A
V DDQ
SUPPLY
VDDQIN
ITH1
V FB2
V ON2
V ON1
C OUT2
100μF
× 4
6k
1000pF
10pF
10pF
ITH2
SGND
VTTR
MODE/SYNC
PGND
3634 F07
0.01μF
V REF
V DDQ /2 AT ±10mA
Figure 7. Application Circuit for a 2-Phase, ±6A Single V TT Output
3634fb
20
For more information www.linear.com/LTC3634
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| LTC3634IUFD#PBF | 功能描述:IC CONV DDR DDR2 DDR3 28QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:43 系列:- 应用:控制器，Intel VR11 输入电压:5 V ~ 12 V 输出数:1 输出电压:0.5 V ~ 1.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-QFN（7x7） 包装:管件 |
| LTC3634IUFD#TRPBF | 功能描述:IC CONV DDR DDR2 DDR3 28QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:43 系列:- 应用:控制器，Intel VR11 输入电压:5 V ~ 12 V 输出数:1 输出电压:0.5 V ~ 1.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-QFN（7x7） 包装:管件 |
| LTC3634MPFE#PBF | 制造商:Linear Technology 功能描述:IC CONV DDR DDR2 DDR3 28TSSOP 制造商:Linear Technology 功能描述:BUCK 15V 3A 500KHZ-4MHZ TS 制造商:Linear Technology 功能描述:BUCK, 15V, 3A, 500KHZ-4MHZ, TSSOP-28 制造商:Linear Technology 功能描述:DP-SWREG/Monolithic, 15V Dual 3A Monolithic Step Down Regulator for DDR Power |
| LTC3634MPFE#TRPBF | 制造商:Linear Technology 功能描述:IC REG 15V 3A STEP DOWN 28-TSSOP 制造商:Linear Technology 功能描述:DC-DC REGULATOR, BUCK, ADJ, TSSOP-28, Primary Input Voltage:15V, No. of Outputs:2, Output Current:3A, No. of Pins:28, Operating Temperature Min:-55C, Operating Temperature Max:150C, MSL:-, Package / Case:28-TSSOP , RoHS Compliant: Yes |
| LTC3634MPUFD#PBF | 制造商:Linear Technology 功能描述:IC CONV DDR DDR2 DDR3 28-QFN 制造商:Linear Technology 功能描述:BUCK 15V 3A 500KHZ-4MHZ QF |
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