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| 型号： | LTC3409EDD#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 11/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 0.6A 8DFN |
| 标准包装： | 121 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.62 V ~ 5.5 V |
| 输入电压： | 1.6 V ~ 5.5 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 1.7MHz ~ 2.6MHz |
| 电流 - 输出： | 600mA |
| 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： | 8-WFDFN 裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 8-DFN-EP（3x3） |
| 产品目录页面： | 1334 (CN2011-ZH PDF) |
LTC3409
APPLICATIONS INFORMATION
V OUT = 0.613V 1 +
wheref=operatingfrequency,C OUT =outputcapacitance
and ΔI L = ripple current in the inductor. For a ?xed output
voltage, the output ripple is highest at maximum input
voltage since ΔI L increases with input voltage. Aluminum
electrolytic and dry tantalum capacitors are both available
in surface mount con?gurations. In the case of tantalum,
it is critical that the capacitors are surge tested for use
in switching power supplies. An excellent choice is the
AVX TPS series of surface mount tantalum. These are
specially constructed and tested for low ESR so they give
the lowest ESR for a given volume. Other capacitor types
include Sanyo POSCAP, Kemet T510 and T495 series, and
Sprague 593D and 595D series. Consult the manufacturer
Output Voltage Programming
The output voltage is set by a resistive divider according
to the following formula:
R1
R2
The external resistive divider is connected to the output,
allowing remote voltage sensing as shown in Figure 1.
V OUT
R1
V FB
for other speci?c recommendations.
LTC3409
GND
R2
Using Ceramic Input and Output Capacitors
Higher value, lower cost ceramic capacitors are now avail-
able in smaller case sizes. Their high ripple current, high
voltage rating and low ESR make them ideal for switching
regulator applications. Because the LTC3409’s control loop
does not depend on the output capacitor’s ESR for stable
operation, ceramic capacitors can be used to achieve very
low output ripple and small circuit size.
However, care must be taken when these capacitors are
used at the input and the output. When a ceramic capacitor
is used at the input and the power is supplied by a wall
adapter through long wires, a load step at the output can
induce ringing at the input, V IN . At best, this ringing can
couple to the output and be mistaken as loop instability. At
worst, a sudden inrush of current through the long wires
can potentially cause a voltage spike at V IN , large enough
to damage the part.
When choosing the input and output ceramic capacitors,
choose the X5R or X7R dielectric formulations. These
dielectrics have the best temperature and voltage charac-
teristics of all the ceramics for a given value and size.
3409 F01
Figure 1
Ef?ciency Considerations
The ef?ciency 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 ef?ciency and which change would produce
the most improvement. Ef?ciency can be expressed as:
Ef?ciency = 100% – (L1 + L2 + L3 + ...)
where L1, L2, etc. are the individual losses as a percent-
age of input power.
Although all dissipative elements in the circuit produce
losses, two main sources usually account for most of
the losses in LTC3409 circuits: V IN quiescent current and
I 2 R losses. The V IN quiescent current loss dominates
the ef?ciency loss at very low load currents whereas the
I 2 R loss dominates the ef?ciency loss at medium to high
load currents. In a typical ef?ciency plot, the ef?ciency
curve at very low load currents can be misleading since
the actual power lost is of no consequence as illustrated
in Figure 2.
3409fc
11
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