参数资料
| 型号： | LTC3417EDHC#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 16/20页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ DL 16DFN |
| 标准包装： | 73 |
| 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： | 800mA，1.4A |
| 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-WFDFN 裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 16-DFN（5x3） |
LTC3417
APPLICATIONS INFORMATION
Design Example
As a design example, consider using the LTC3417 in a
C OUT selection is based on load step droop instead of ESR
requirements. For a 5% output droop:
portable application with a Li-Ion battery. The battery
provides a V IN from 2.5V to 4.2V. One output requires
1.8V at 1.3A in active mode, and 1mA in standby mode.
The other output requires 2.5V at 700mA in active mode,
and 500μA in standby mode. Since both loads still need
C OUT1 = 2.5 ?
C OUT2 = 2.5 ?
1.3A
1.5MHz ( 5% ? 1.8V )
0.7A
1.5MHz ( 5% ? 2.5V )
= 24 μ F
= 9.3 μ F
power in standby, Burst Mode operation is selected for
good low load ef?ciency (MODE = V IN ).
First, determine what frequency should be used. Higher
frequency results in a lower inductor value for a given Δ I L
( Δ I L is estimated as 0.35I LOAD(MAX) ). Reasonable values
for wire wound surface mount inductors are usually in the
range of 1μH to 10μH.
The closest standard values are 22μF and 10μF.
The output voltages can now be programmed by choos-
ing the values of R1, R2, R3, and R4. To maintain high
ef?ciency, the current in these resistors should be kept
small. Choosing 2μA with the 0.8V feedback voltages makes
R2 and R4 equal to 400k. A close standard 1% resistor is
CONVERTER OUTPUT
SW1
I LOAD(MAX)
1.4A
Δ I L
490mA
412k. This then makes R1 = 515k. A close standard 1%
is 511k. Similarily, with R4 at 412k, R3 is equal to 875k.
A close 1% resistor is 866k.
SW2 800mA 280mA
Using the 1.5MHz frequency setting (FREQ = V IN ), we get
the following equations for L 1 and L 2 :
The compensation should be optimized for these compo-
nents by examining the load step response, but a good
place to start for the LTC3417 is with a 5.9kΩ and 2200pF
L1 =
L2 =
1.8V
1.5MHz ? 490mA
Use 1.5 μ H.
2.5V
1.5MHz ? 280mA
1–
1–
1.8V
4.2V
2.5V
4.2V
= 1.4 μ H
= 2.4 μ H
?lter on I TH1 and 2.87k and 6800pF on I TH2 . The output
capacitor may need to be increased depending on the
actual undershoot during a load step.
The PGOOD pin is a common drain output and requires a
pull-up resistor. A 100k resistor is used for adequate speed.
Figure 4 shows a complete schematic for this design.
Use 2.2 μ H.
3417fd
16
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