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参数资料
| 型号： | LTC3417AIFE-2#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 9/20页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ DL 20TSSOP |
| 标准包装： | 2,500 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 2 |
| 输出电压： | 0.8 V ~ 5 V |
| 输入电压： | 2.25 V ~ 5.5 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 1.5MHz，600kHz ~ 4MHz |
| 电流 - 输出： | 1A，1.5A |
| 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： | 20-TSSOP（0.173"，4.40mm 宽）裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 20-TSSOP-EP |
LTC3417A-2
APPLICATIONS INFORMATION
A general LTC3417A-2 application circuit is shown in
Figure 4. External component selection is driven by the
load requirement, and begins with the selection of the
inductors L1 and L2. Once L1 and L2 are chosen, C IN ,
C OUT1 and C OUT2 can be selected.
Operating Frequency
Selection of the operating frequency is a tradeoff between
ef?ciency and component size. High frequency operation
160
140
120
100
80
60
40
20
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
0
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5
FREQUENCY (MHz)
3417A-2 F01
inductance values and/or capacitance to maintain low
output ripple voltage.
The operating frequency, f O , of the LTC3417A-2 is deter-
mined by pulling the FREQ pin to V IN for 1.5MHz opera-
tion or by connecting an external resistor from FREQ to
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:
Figure 1. Frequency vs R T
Inductor Selection
Although the inductor does not in?uence the operating
frequency, the inductor value has a direct effect on ripple
current. The inductor ripple current, Δ I L , decreases with
higher inductance and increases with higher V IN or V OUT .
1– OUT
R T ≈
1.61? 10
f O
11
( Ω ) – 16.586k Ω
I L =
V OUT
f O ? L
V
V IN
Accepting larger values of Δ I L allows the use of low induc-
for 0.6MHz ≤ f O ≤ 4MHz. Alternatively, use Figure 1 to
select the value for R T .
The maximum operating frequency is also constrained
by the minimum on-time and duty cycle. This can be
calculated as:
tances, but results in higher output voltage ripple, greater
core losses and lower output current capability.
A reasonable starting point for setting ripple current is
Δ I L = 0.35I LOAD(MAX) , where I LOAD(MAX) is the maximum
current output. The largest ripple, Δ I L , occurs at the maxi-
f O(MAX) 6.67
V OUT
V IN(MAX)
( MHz )
mum input voltage. To guarantee that the ripple current
stays below a speci?ed maximum, the inductor value
should be chosen according to the following equation:
The minimum frequency is limited by leakage and noise
coupling due to the large resistance of R T .
L =
V OUT
f O ? I L
1–
V OUT
V IN(MAX)
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3417a2fa
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