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| 型号： | LTC3419IDD#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 10/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ .6A DL 8DFN |
| 标准包装： | 121 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 2 |
| 输出电压： | 0.6 V ~ 5.5 V |
| 输入电压： | 2.5 V ~ 5.5 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 2.25MHz |
| 电流 - 输出： | 600mA |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 125°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) |
LTC3419
APPLICATIONS INFORMATION
? 8 f O OUT ?
V OUT = 0 . 6 V ? 1 +
? R 2 ?
R 1 ? ?
?
deviations do not offer much relief. Note that capacitor
manufacturer’s ripple current ratings are often based on
only 2000 hours lifetime. This makes it advisable to further
derate the capacitor, or choose a capacitor rated at a higher
temperature than required. Several capacitors may also be
paralleled to meet the size or height requirements of the
design. An additional 0.1μF to 1μF ceramic capacitor is
also recommended on V IN for high frequency decoupling
when not using an all-ceramic capacitor solution.
Output Capacitor (C OUT ) Selection
The selection of C OUT is driven by the required effective
series resistance (ESR). Typically, once the ESR requirement
for C OUT has been met, the RMS current rating generally
far exceeds the I RIPPLE(P-P) requirement. The output ripple
ΔV OUT is determined by:
? 1 ?
Δ V OUT ≈ Δ I L ? ESR + ?
C
where f O = operating frequency, C OUT = output capacitance
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.
If tantalum capacitors are used, 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 for other speci?c recommendations.
Using Ceramic Input and Output Capacitors
Higher values, lower cost ceramic capacitors are now
becoming available in smaller case sizes. Their high
ripple current, high voltage rating and low ESR make
them ideal for switching regulator applications. Because
the LTC3419 control loop does not depend on the output
However, care must be taken when ceramic capacitors are
used at the input. 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. For more information, see Application Note 88.
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.
Setting the Output Voltage
The LTC3419 regulates the V FB1 and V FB2 pins to 0.6V
during regulation. Thus, the output voltage is set by a
resistive divider according to the following formula:
( 2 )
Keeping the current small (< 10μA) in these resistors
maximizes ef?ciency, but making it too small may allow
stray capacitance to cause noise problems or reduce the
phase margin of the error amp loop.
To improve the frequency response of the main control
loop, a feedback capacitor (C F ) may also be used. Great
care should be taken to route the V FB line away from noise
sources, such as the inductor or the SW line.
Fixed output versions of the LTC3419 (e.g. LTC3419-1)
include an internal resistive divider, eliminating the need
for external resistors. The resistor divider is chosen
such that the V FB input current is approximately 3μA. For
these versions the V FB pin should be connected directly
to V OUT . Table 2 lists the ?xed output voltages available
for the LTC3419.
Table 2. Fixed Output Voltage Versions
capacitor’s ESR for stable operation, ceramic capacitors
can be used freely to achieve very low output ripple and
small circuit size.
PART NUMBER
LTC3419
LTC3419-1
V OUT1
Adjustable
1.575V
V OUT2
Adjustable
1.8V
3419fa
10
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