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| 型号： | LTC3410BESC6-1.8#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 10/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC 1.8V .3A SC70-6 |
| 标准包装： | 2,500 |
| 类型： | 降压（降压） |
| 输出类型： | 固定 |
| 输出数： | 1 |
| 输出电压： | 1.8V |
| 输入电压： | 2.5 V ~ 5.5 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 2.25MHz |
| 电流 - 输出： | 300mA |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 6-TSSOP，SC-88，SOT-363 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | SC-70-6 |
LTC3410B
APPLICATIO S I FOR ATIO
Efficiency Considerations
The 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. 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, two main sources usually account for most of the
losses in LTC3410B circuits: V IN quiescent current and I 2 R
losses. The V IN quiescent current loss dominates the
efficiency loss at very low load currents whereas the I 2 R
loss dominates the efficiency loss at medium to high load
currents. In a typical efficiency plot, the efficiency curve at
very low load currents can be misleading since the actual
power lost is of no consequence as illustrated in Figure 3.
1. The V IN quiescent current is due to two components:
the DC bias current as given in the electrical character-
istics and the internal main switch and synchronous
switch gate charge currents. The gate charge current
results from switching the gate capacitance of the
internal power MOSFET switches. Each time the gate is
switched from high to low to high again, a packet of
charge, dQ, moves from V IN to ground. The resulting
dQ/dt is the current out of V IN that is typically larger than
the DC bias current. In continuous mode,
I GATECHG = f(Q T + Q B ) where Q T and Q B are the
gate charges of the internal top and bottom
switches. Both the DC bias and gate charge
losses are proportional to V IN and thustheir effectswill
be more pronounced at higher supply voltages.
2. I 2 R losses are calculated from the resistances of the
internal switches, R SW , and external inductor R L . In
continuous mode, the average output current flowing
through inductor L is “chopped” between the main
switch and the synchronous switch. Thus, the series
resistance looking into the SW pin is a function of both
top and bottom MOSFET R DS(ON) and the duty cycle
(DC) as follows:
R SW = (R DS(ON)TOP )(DC) + (R DS(ON)BOT )(1 – DC)
The R DS(ON) for both the top and bottom MOSFETs can
be obtained from the Typical Performance Charateristics
curves. Thus, to obtain I 2 R losses, simply add R SW to
R L and multiply the result by the square of the average
output current.
Other losses including C IN and C OUT ESR dissipative
losses and inductor core losses generally account for less
than 2% total additional loss.
1
0.1
0.01
0.001
V OUT = 1.2V
V OUT = 1.8V
0.0001
V OUT = 2.5V
0.1
1
10 100
1000
LOAD CURRENT (mA)
3410 F03
Figure 3. Power Lost vs Load Current
3410bfa
10
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相关代理商/技术参数 |
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| LTC3410ESC6 | 制造商:Linear Technology 功能描述:Conv DC-DC Single Step Down 2.5V to 5.5V 6-Pin SC-70 |
| LTC3410ESC6#PBF | 制造商:Linear Technology 功能描述:BUCK SYNCH 0.3A 2.25MHZ 6S 制造商:Linear Technology 功能描述:BUCK, SYNCH, 0.3A, 2.25MHZ, 6SC70 |
| LTC3410ESC6#TRMPBF | 功能描述:IC REG BUCK SYNC ADJ 0.3A SC70-6 RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:500 系列:- 类型:切换式电容器（充电泵），反相 输出类型:固定 输出数:1 输出电压:-3V 输入电压:2.3 V ~ 5.5 V PWM 型:Burst Mode? 频率 - 开关:900kHz 电流 - 输出:100mA 同步整流器:无 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-6 细型，TSOT-23-6 包装:带卷 (TR) 供应商设备封装:TSOT-23-6 其它名称:LTC1983ES6-3#TRMTR |
| LTC3410ESC6#TRPBF | 功能描述:IC REG BUCK SYNC ADJ 0.3A SC70-6 RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:500 系列:- 类型:切换式电容器（充电泵），反相 输出类型:固定 输出数:1 输出电压:-3V 输入电压:2.3 V ~ 5.5 V PWM 型:Burst Mode? 频率 - 开关:900kHz 电流 - 输出:100mA 同步整流器:无 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-6 细型，TSOT-23-6 包装:带卷 (TR) 供应商设备封装:TSOT-23-6 其它名称:LTC1983ES6-3#TRMTR |
| LTC3410ESC6-1.2 | 制造商:LINER 制造商全称:Linear Technology 功能描述:2.25MHz, 300mA Synchronous Step-Down Regulator in SC70 |
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