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| 型号： | LTC3601EMSE#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 10/26页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 1.5A 16MSOP |
| 标准包装： | 2,500 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.5 V ~ 14.52 V |
| 输入电压： | 4 V ~ 15 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 800kHz ~ 4MHz |
| 电流 - 输出： | 1.5A |
| 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： | 16-TFSOP（0.118"，3.00mm 宽）裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 16-MSOP，裸露焊盘 |
LTC3601
APPLICATIONS INFORMATION
R RT =
I L =
V OUT V OUT
AgeneralLTC3601applicationcircuitisshownonthe?rst
page of this data sheet. External component selection is
largely driven by the load requirement and begins with the
selection of the inductor L. Once the inductor is chosen,
the input capacitor, C IN , the output capacitor, C OUT , the
internal regulator capacitor, C INTVCC , and the boost capaci-
tor, C BOOST , can be selected. Next, the feedback resistors
are selected to set the desired output voltage. Finally, the
remaining optional external components can be selected
for functions such as external loop compensation, track/
soft-start, externally programmed oscillator frequency
and PGOOD.
Operating Frequency
Selection of the operating frequency is a trade-off between
ef?ciency and component size. High frequency operation
allows the use of smaller inductor and capacitor values.
Operation at lower frequencies improves ef?ciency by
reducing internal gate charge losses but requires larger
inductance values and/or capacitance to maintain low
output ripple voltage.
The operating frequency, f O , of the LTC3601 is determined
by an external resistor that is connected between the RT
pin and ground. The value of the resistor sets the ramp
current that is used to charge and discharge an internal
timing capacitor within the oscillator and can be calculated
by using the following equation:
3.2 E11
f O
Connecting the RT pin to INTV CC will default the converter
to f O = 2MHz; however, this switching frequency will be
more sensitive to process and temperature variations than
when using a resistor on RT (see Typical Performance
Characteristics).
Inductor Selection
For a given input and output voltage, the inductor value and
operating frequency determine the inductor ripple current.
More speci?cally, the inductor ripple current decreases
with higher inductor value or higher operating frequency
according to the following equation:
1–
f ?L V IN
where ? I L = inductor ripple current, f = operating frequency
and L = inductor value. A trade-off between component
size, ef?ciency and operating frequency can be seen from
this equation. Accepting larger values of ? I L allows the
use of lower value inductors but results in greater core
loss in the inductor, greater ESR loss in the output capaci-
tor, and larger output ripple. Generally, highest ef?ciency
operation is obtained at low operating frequency with
small ripple current.
A reasonable starting point for setting the ripple current is
about 40% of I OUT(MAX) . Note that the largest ripple current
occurs at the highest V IN . To guarantee the ripple current
does not exceed a speci?ed maximum the inductance
should be chosen according to:
where R RT is in Ω and f O is in Hz.
6000
L =
V OUT
f ? I L(MAX)
1–
V OUT
V IN(MAX)
5000
4000
3000
2000
1000
Once the value for L is known the type of inductor must
be selected. Actual core loss is independent of core size
for a ?xed inductor value but is very dependent on the
inductance selected. As the inductance increases, core loss
decreases. Unfortunately, increased inductance requires
more turns of wire leading to increased copper loss.
Ferrite designs exhibit very low core loss and are pre-
0
0
100
200
300 400
RT (kΩ)
500
600
ferred at high switching frequencies, so design goals can
concentrate on copper loss and preventing saturation.
3601 F01
Figure 1. Switching Frequency vs RT
Ferrite core materials saturate “hard,” meaning the induc-
tance collapses abruptly when the peak design current is
3601fb
10
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