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参数资料
| 型号： | LTC3612IUDC#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 12/30页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 3A 20QFN |
| 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： | 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： | 带卷 (TR) |
| 供应商设备封装： | 20-QFN（3x4） |
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LTC3612
OPERATION
Burst Mode ENABLE—EXTERNAL CLAMP,
CONTROLLED BY VOLTAGE APPLIED AT
MODE PIN
MainControlLoop
The LTC3612 is a monolithic, constant frequency, current
mode step-down DC/DC converter. During normal opera-
tion, the internal top power switch (P-channel MOSFET) is
turned on at the beginning of each clock cycle. Current in
the inductor increases until the current comparator trips
and turns off the top power switch. The peak inductor cur-
rent at which the current comparator trips is controlled by
the voltage on the ITH pin. The error amplifier adjusts the
voltage on the ITH pin by comparing the feedback signal
from a resistor divider on the V FB pin with an internal 0.6V
reference. When the load current increases, it causes a
reduction in the feedback voltage relative to the reference.
The error amplifier raises the ITH voltage until the average
inductor current matches the new load current. Typical
voltage range for the ITH pin is from 0.1V to 1.05V with
0.45V corresponding to zero current.
When the top power switch shuts off, the synchronous
power switch (N-channel MOSFET) turns on until either
the bottom current limit is reached or the next clock cycle
begins. The bottom current limit is typically set at –4A for
forced continuous mode and 0A for Burst Mode operation
and pulse-skipping mode.
The operating frequency defaults to 2.25MHz when
RT/SYNC is connected to SV IN , or can be set by an ex-
ternal resistor connected between the RT/SYNC pin and
ground, or by a clock signal applied to the RT/SYNC pin.
The switching frequency can be set from 300kHz to 4MHz.
Overvoltage and undervoltage comparators pull the
PGOOD output low if the output voltage varies typically
more than ±7.5% from the set point.
Mode Selection
The MODE pin is used to select one of four different
operating modes:
Mode Selection Voltage
SV IN
PS PULSE-SKIPPING MODE ENABLE
SV IN – 0.3V
SV IN ? 0.58
FC FORCED CONTINUOUS MODE ENABLE
1.1V
0.8V
BM
EXT
0.45V
0.3V
BM Burst Mode ENABLE—INTERNAL CLAMP
SGND
3612 OP01
Burst Mode Operation—Internal Clamp
Connecting the MODE pin to SGND enables Burst Mode
operation with an internal clamp. In Burst Mode operation
the internal power switches operate intermittently at light
loads. This increases efficiency by minimizing switching
losses. During the intervals when the switches are idle,
the LTC3612 enters sleep state where many of the internal
circuits are disabled to save power. During Burst Mode
operation, the minimum peak inductor current is internally
clamped and the voltage on the ITH pin is monitored by
the burst comparator to determine when sleep mode is
enabled and disabled. When the average inductor current
is greater than the load current, the voltage on the ITH pin
drops. As the ITH voltage falls below the internal clamp,
the burst comparator trips and enables sleep mode. During
sleep mode, the power MOSFETs are held off and the load
current is solely supplied by the output capacitor. When the
output voltage drops, the top power switch is turned back
on and the internal circuits are re-enabled. This process
repeats at a rate that is dependent on the load current.
3612fb
12
For more information www.linear.com/LTC3612
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