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参数资料
| 型号： | LTC3616IUDD#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 14/28页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 6A 24QFN |
| 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： | 0.6 V ~ 5.5 V |
| 输入电压： | 2.25 V ~ 5.5 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 300kHz ~ 4MHz |
| 电流 - 输出： | 6A |
| 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： | 24-QFN |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 24-QFN（3x5） |
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LTC3616
APPLICATIONS INFORMATION
? I L = ? OUT ? ? ? 1 – OUT ?
FrequencySynchronization
The LTC3616’s internal oscillator can be synchronized to
an external frequency by applying a square wave clock
signal to the RT/SYNC pin. During synchronization, the top
switch turn-on is locked to the falling edge of the external
frequency source. The synchronization frequency range
is 300kHz to 4MHz. During synchronization all operation
modes can be selected.
It is recommended that the regulator is powered down
(RUN pin to ground) before removing the clock signal on
the RT/SYNC pin in order to reduce inductor current ripple.
AC coupling should be used if the external clock generator
cannot provide a continuous clock signal throughout start-
up, operation and shutdown of the LTC3616. The size of
capacitor C SYNC depends on parasitic capacitance on the
RT/SYNC pin and is typically in the range of 10pF to 22pF.
Inductor Selection
For a given input and output voltage, the inductor value
and operating frequency determine the ripple current. The
ripple current ? I L increases with higher V IN and decreases
with higher inductance:
? V ? ? V ?
? f SW ? L ? ? V IN ?
Having a lower ripple current reduces the core losses
in the inductor, the ESR losses in the output capacitors
and the output voltage ripple. A reasonable starting point
for selecting the ripple current is ? I L = 0.3 ? I OUT(MAX) .
The largest ripple current occurs at the highest V IN . To
guarantee that the ripple current stays below a specified
maximum, the inductor value should be chosen according
to the following equation:
V OUT
?? ? ? 1 – OUT ?
L = ??
V IN
V IN
0.4V
R T
V IN
LTC3616
SV IN
RT/SYNC
LTC3616
SV IN
RT/SYNC
SGND
LTC3616
SV IN
RT/SYNC
SGND
f OSC
2.25MHz
f OSC ∝ 1/R T
f OSC
1/T P
? ? ? V ?
? f SW ? ? I L(MAX) ? ? V IN ?
The inductor value will also have an effect on Burst Mode
operation. The transition to low current operation begins
when the peak inductor current falls below a level set by the
burst clamp. Lower inductor values result in higher ripple
current which causes this to occur at lower load currents.
This causes a dip in efficiency in the upper range of low
current operation. In Burst Mode operation, lower induc-
tance values will cause the burst frequency to increase.
Inductor Core Selection
T P
C SYNC
V IN
1.2V
0.3V
LTC3616
SV IN
RT/SYNC
SGND
f OSC
1/T P
Once the value for L is known, the type of inductor must be
selected. Actual core loss is independent of core size for
fixed inductor value, but it is very dependent on the induc-
tance selected. As the inductance increases, core losses de-
crease. Unfortunately, increased inductance requires more
turns of wire and therefore, copper losses will increase.
R T
3616 F02
Figure 2. Setting the Switching Frequency
14
For more information www.linear.com/LTC3616
3616fb
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| LTC3617EUDD#PBF | 功能描述:IC REG SYNC 6A BUCK 24-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:2,000 系列:- 应用:控制器，DSP 输入电压:4.5 V ~ 25 V 输出数:2 输出电压:最低可调至 1.2V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:30-TFSOP（0.173"，4.40mm 宽） 供应商设备封装:30-TSSOP 包装:带卷 (TR) |
| LTC3617EUDD#TRPBF | 功能描述:IC REG SYNC 6A BUCK 24QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:43 系列:- 应用:控制器，Intel VR11 输入电压:5 V ~ 12 V 输出数:1 输出电压:0.5 V ~ 1.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-QFN（7x7） 包装:管件 |
| LTC3617IUDD#PBF | 功能描述:IC REG SYNC 6A BUCK 24QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:43 系列:- 应用:控制器，Intel VR11 输入电压:5 V ~ 12 V 输出数:1 输出电压:0.5 V ~ 1.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-QFN（7x7） 包装:管件 |
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