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| 型号： | LTC3603EUF#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 14/22页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 2.5A 20QFN |
| 标准包装： | 91 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.6 V ~ 14.5 V |
| 输入电压： | 4.5 V ~ 15 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 300kHz ~ 3MHz |
| 电流 - 输出： | 2.5A |
| 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： | 20-WFQFN 裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 20-QFN 裸露焊盘（4x4） |
LTC3603
APPLICATIONS INFORMATION
V X
V OUT
TIME
Figure 5b. Ratiometric Tracking
V X
V OUT
supply. Each time the gate is switched from high to
low to high again, a packet of charge, dQ, moves from
INTV CC to ground. The resulting dQ/dt is the current
out of INTV CC that is typically larger than the DC bias
current. In continuous mode, the gate charge current
can be approximated by I GATECHG = f(9.5nC). Since the
INTV CC voltage is generated from V IN by a linear regula-
tor, the current that is internally drawn from the INTV CC
supply can be treated as V IN current for the purposes
of efficiency considerations.
Transition losses apply only to the internal topside
MOSFET and become more prominent at higher input
voltages. Transition losses can be estimated from:
Transition Loss = (1.7) V IN2 ? I O(MAX) ? (120pF) ? f
ing through inductor L is chopped between the main
switch and the synchronous switch. Thus, the series
Efficiency Considerations
R SW = (R DS(ON)TOP )(DC) + (R DS(ON)BOT )(1 – DC)
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
I 2 R Loss = I O2 (R SW + R L )
Other losses, including C IN and C OUT ESR dissipative
losses and inductor core losses, generally account for
losses: V IN operating current and I 2 R losses.
In most applications, the LTC3603 does not dissipate much
1. The V IN operating current comprises three components:
14
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 flow-
3603 F05b,c
TIME
Figure 5c. Coincident Tracking
resistance looking into the SW pin is a function of both
top and bottom MOSFET R DS(ON) and the duty cycle
The efficiency of a switching regulator is equal to the output (DC) as follows:
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 R DS(ON) for both the top and bottom MOSFETs can
the most improvement. Efficiency can be expressed as: be obtained from the Typical Performance Characteristics
Efficiency = 100% – (L1 + L2 + L3 + ...)
where L1, L2, etc. are the individual losses as a percent- output current:
age of input power.
Although all dissipative elements in the circuit produce
losses, two main sources usually account for most of the
less than 2% of the total power loss.
The V IN operating current loss dominates the efficiency loss
at very low load currents whereas the I 2 R loss dominates Thermal Considerations
the efficiency loss at medium to high load currents.
heat due to its high efficiency. But, in applications where the
The DC supply current as given in the electrical char- LTC3603 is running at high ambient temperature with low
acteristics, the internal MOSFET gate charge currents supply voltage and high duty cycles, such as in dropout,
and the internal topside MOSFET transition losses. The the heat dissipated may exceed the maximum junction
MOSFET gate charge current results from switching the temperature of the part. If the junction temperature reaches
gate capacitance of the internal power MOSFET switches. approximately 150°C, both power switches will be turned
The gates of these switches are driven from the INTV CC off and the SW node will become high impedance.
3603fc
For more information www.linear.com/LTC3603
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