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参数资料
| 型号： | LTC3612IUDC#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 13/30页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 3A 20QFN |
| 标准包装： | 91 |
| 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： | 3A |
| 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-WFQFN 裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 20-QFN（3x4） |
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LTC3612
OPERATION
Burst Mode Operation—External Clamp
Connecting the MODE pin to a voltage in the range of 0.45V
to 0.8V enables Burst Mode operation with external clamp.
During this mode of operation the minimum voltage on
the ITH pin is externally set by the voltage on the MODE
pin. It is recommended to use Burst Mode operation with
an internal clamp for temperatures above 85°C ambient.
Pulse-Skipping Mode Operation
Pulse-skipping mode is similar to Burst Mode operation,
but the LTC3612 does not disable power to the internal
circuitry during sleep mode. This improves output voltage
ripple but uses more quiescent current, compromising
light load efficiency.
Tying the MODE pin to SV IN enables pulse-skipping mode.
As the load current decreases, the peak inductor current
will be determined by the voltage on the ITH pin until the
ITH voltage drops below the voltage level corresponding to
0A. At this point, the peak inductor current is determined
by the minimum on-time of the current comparator. If the
load demand is less than the average of the minimum on-
time inductor current, switching cycles will be skipped to
keep the output voltage in regulation.
Forced Continuous Mode
In forced continuous mode the inductor current is con-
stantly cycled which creates a minimum output voltage
ripple at all output current levels.
Connecting the MODE pin to a voltage in the range of
1.1V to SV IN ? 0.58 will enable forced continuous mode
operation.
At light loads, forced continuous mode operation is less
efficient than Burst Mode or pulse-skipping operation, but
may be desirable in some applications where it is neces-
sary to keep switching harmonics out of the signal band.
Dropout Operation
As the input supply voltage approaches the output voltage,
the duty cycle increases toward the maximum on-time.
Further reduction of the supply voltage forces the main
switch to remain on for more than one cycle, eventually
reaching 100% duty cycle. The output voltage will then be
determined by the input voltage minus the voltage drop
across the internal P-channel MOSFET and the inductor.
Low Supply Operation
The LTC3612 is designed to operate down to an input
supply voltage of 2.25V. An important consideration at low
input supply voltages is that the R DS(ON) of the P-channel
and N-channel power switches increases. The user should
calculate the power dissipation when the LTC3612 is used
at 100% duty cycle with low input voltages to ensure that
thermal limits are not exceeded. See the Typical Perfor-
mance Characteristics graphs.
Short-Circuit Protection
The peak inductor current at which the current comparator
shuts off the top power switch is controlled by the voltage
on the ITH pin.
If the output current increases, the error amplifier raises the
ITH pin voltage until the average inductor current matches
the new load current. In normal operation the LTC3612
clamps the maximum ITH pin voltage at approximately
1.05V which corresponds typically to 6A peak inductor
current.
When the output is shorted to ground, the inductor current
decays very slowly during a single switching cycle. The
LTC3612 uses two techniques to prevent current runaway
from occurring.
Forced continuous mode must be used if the output is
required to sink current.
3612fb
For more information www.linear.com/LTC3612
13
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