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参数资料
| 型号： | LTC3546EUFD#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 14/30页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 1A/2A 28QFN |
| 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： | 0.6 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： | 2.25MHz，750kHz ~ 4MHz |
| 电流 - 输出： | 1A，2A |
| 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： | 28-WFQFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 28-QFN（4x5） |
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LTC3546
APPLICATIONS INFORMATION
? ( MHz )
? V OUT ?
f O(MAX) ≈ 6.67 ?
1 ? OUT ?
V OUT ? V ?
f O ? L ? ?
Δ I L =
( Ω ) – 20k Ω
2.51 ? 10 11
R T =
A general LTC3546 application circuit is shown in Figure 7.
External component selection is driven by the load require-
ment, 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 trade-off between
efficiency and component size. High frequency operation
allows the use of smaller inductor and capacitor values.
Operation at lower frequencies improves efficiency 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 LTC3546 is determined
by pulling the FREQ pin to V IN , for 2.25MHz operation, by
connecting an external resistor from FREQ to ground, or
by driving an external clock signal into SYNC/MODE.
When using an external resistor to set the oscillator fre-
quency use the following equation:
f O
for 0.75MHz ≤ f O ≤ 4MHz. Or use Figure 1 to select the
value for R T .
Assuming a worst-case minimum on-time of 150ns, this
can be calculated as:
? V IN(MAX) ?
The minimum frequency is limited by leakage and noise
coupling due to the large resistance of R T .
Inductor Selection
Although the inductor does not influence 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 .
V IN ?
Accepting larger values of Δ I L allows the use of low
inductances, 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 output
current. The largest ripple Δ I L occurs at the maximum
input voltage. To guarantee that the ripple current stays
below a specified maximum, the inductor value should be
chosen according to the following equation:
? 1 ? V
V OUT ? V OUT ?
f O ? Δ I L ?
IN(MAX) ?
The maximum operating frequency is also constrained
by the minimum on-time (typically 70ns) and duty cycle,
especially when forced continuous mode is selected.
500
450
400
350
300
250
200
150
100
50
L ≥
?
0
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5
FREQUENCY (MHz)
3546 F01
Figure 1. Frequency vs R T
14
For more information www.linear.com/3546
3546fc
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