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| 型号： | LTC3104IMSE#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 10/20页 |
| 文件大小： | 339K |
| 描述： | IC REG DL BCK/LINEAR SYNC 16MSOP |
| 标准包装： | 2,500 |
| 拓扑： | 降压（降压）同步（1），线性（LDO）（1） |
| 功能： | 任何功能 |
| 输出数： | 2 |
| 频率 - 开关： | 1.2MHz |
| 电压/电流 - 输出 1： | 0.6 V ~ 13.8 V，300mA |
| 电压/电流 - 输出 2： | 0.6 V ~ 14.5 V，10mA |
| 带 LED 驱动器： | 无 |
| 带监控器： | 无 |
| 带序列发生器： | 无 |
| 电源电压： | 2.5 V ~ 15 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-TFSOP（0.118"，3.00mm 宽）裸露焊盘 |
| 供应商设备封装： | 16-MSOP，裸露焊盘 |
| 包装： | 带卷 (TR) |
LTC3104
10
3104f
OPERATION
inductor current where the comparator trips is controlled
by the voltage on the output of the error amplifier. The FB
pin allows the internally compensated error amplifier to
receive an output feedback voltage from an external resis-
tive divider from V
OUT
. When the load current increases,
the output begins to fall causing a slight decrease in the
feedback voltage relative to the 0.6V reference, this in turn,
causes the control voltage to increase until the average
inductor current matches the new load current. While the
top MOSFET is off, the bottom MOSFET is turned on until
either the inductor current starts to reverse as indicated by
the current reversal comparator, I
ZERO
, or the beginning
of the next clock cycle. I
ZERO
is set to 40mA (typical) in
automatic Burst Mode operation and 110mA (typical) in
forced continuous mode.
Forced Continuous Mode
Grounding MODE enables forced continuous operation
and disables Burst Mode operation. At light loads, forced
continuous mode minimizes output voltage ripple and
noise but is less efficient than Burst Mode operation.
Forced continuous operation may be desirable for use in
applications that are sensitive to the Burst Mode output
voltage ripple or its harmonics. The LTC3104 offers a broad
range of possible step down ratios without pulse skipping
but for very small step-down ratios, the minimum on-time
of the main switch will be reached and the converter will
begin turning off for multiple cycles in order to maintain
regulation.
Burst Mode Operation
Holding the MODE pin above 1.2V will enable automatic
Burst Mode operation and disable forced continuous op-
eration. As the load current increases, the converter will
automatically transition between Burst Mode and PWM
operation. Conversely the converter will automatically
transition from PWM operation to Burst Mode operation
as the load decreases. Between bursts the converter is not
active (i.e., both switches are off) and most of the internal
circuitry is disabled to reduce the quiescent current to
2.6礎. Burst Mode entry and exit is determined by the peak
inductor current and therefore the load current at which
Burst Mode operation will be entered or exited depends
on the input voltage, the output voltage and the inductor
value. Typical curves for Burst Mode entry threshold are
provided in the Typical Performance Characteristics sec-
tion of this data sheet.
Soft-Start
The converter has an internal closed-loop soft-start circuit
with a nominal duration of 1.4ms. The converter remains
in regulation during soft-start and will therefore respond
to output load transients that occur during this time. In
addition, the output voltage rise time has minimal depen-
dency on the size of the output capacitor or load current.
Thermal Shutdown
If the die temperature exceeds 150癈 (typical) the con-
verter and LDO will be disabled. All power devices will be
turned off and the switch node will be forced into a high
impedance state. The soft-start circuit is reset during
thermal shutdown to provide a smooth recovery once the
overtemperature condition is eliminated. If enabled, the
converter and the LDO will restart when the die temperature
drops to approximately 130癈.
Power Good Status Output
The PGOOD pin is an open-drain output which indicates
the output voltage status of the step-down converter. If the
output voltage falls 10% below the regulation voltage, the
PGOOD open-drain output will pull low. A built-in deglitch-
ing delay prevents false trips due to voltage transients on
load steps. The output voltage must rise 2% above the
falling threshold before the pull-down will turn off. The
PGOOD output will also pull low during overtemperature
shutdown and undervoltage lockout to indicate these fault
conditions. The PGOOD output is valid 1ms after the buck
converter is enabled. When the converter is disabled the
open-drain device is forced on into a low impedance state.
The PGOOD pull-up voltage must be below the 6V absolute
maximum voltage rating of the pin.
Current Limit
The peak inductor current limit comparator shuts off the
buck switch once the internal limit threshold is reached.
Peak switch current is no less than 400mA.
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