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| 型号： | LTC3100EUD#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 14/26页 |
| 文件大小： | 403K |
| 描述： | IC REG BUCK/BOOST/LINEAR 16-QFN |
| 产品培训模块： | More Information on LDOs |
| 标准包装： | 121 |
| 拓扑： | 降压（降压）（1），升压（升压）（1），线性（LDO）（1） |
| 功能： | 任何功能 |
| 输出数： | 3 |
| 频率 - 开关： | 1.5MHz |
| 电压/电流 - 输出 1： | 0.6 V ~ 5.5 V，250mA |
| 电压/电流 - 输出 2： | 1.5 V ~ 5.25 V，700mA |
| 电压/电流 - 输出 3： | 0.6 V ~ 5.25 V，100mA |
| 带 LED 驱动器： | 无 |
| 带监控器： | 无 |
| 带序列发生器： | 是 |
| 电源电压： | 0.5 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-WFQFN 裸露焊盘 |
| 供应商设备封装： | 16-QFN-EP（3x3） |
| 包装： | 管件 |
LTC3100
14
3100fb
For more information www.linear.com/LTC3100
buck converters. In this case, both converters will remain
in fixed frequency operation, even at light load currents. If
the load is very light, they will exhibit pulse-skip operation.
If MODE is raised above 0.9V, or left open, Burst Mode
operation will be enabled for both converters. In this case,
either converter may enter Burst Mode operation at light
load, and return to fixed frequency operation when the
load current increases. Refer to the Typical Performance
Characteristics section to see the output load Burst Mode
threshold vs V
IN
and V
OUT
. The two converters can enter
or leave Burst Mode operation independent of each other.
In Burst Mode operation, each converter still switches at
a frequency of 1.5MHz, using the same error amplifier
and loop compensation for peak current mode control.
This control method eliminates any output transient when
switching between modes. In Burst Mode operation, energy
is delivered to the output until it reaches the nominal reg-
ulation value, then the LTC3100 transitions to sleep mode
where the outputs are off and the LTC3100 consumes only
15礎 of quiescent current from V
BST
. Once the output
voltage has drooped slightly, switching resumes again.
This maximizes efficiency at very light loads by minimizing
switching and quiescent losses. Burst Mode operation
output ripple is typically 1% peak-to-peak.
Burst Mode operation for the boost converter is inhibited
during start-up, and until soft-start is complete and V
BST
is at least 0.24V greater than V
INBST
.
Short-Circuit Protection
The LTC3100 output disconnect feature allows output
short-circuit while maintaining a maximum internally set
current limit. To reduce power dissipation under short-cir-
cuit conditions, the boost peak switch current limit is
reduced to 400mA (typical).
Schottky Diode
Although it is not required, adding a Schottky diode from
SWBST to V
BST
will improve efficiency by about 2%.
Note that this defeats the boost output disconnect and
short-circuit protection features.
BUCK CONVERTER OPERATION
The buck converter provides a high efficiency, lower voltage
output and supports 100% duty cycle operation to extend
battery life. The buck converter uses the same 1.5MHz
oscillator used by the boost converter.
PWM Mode Operation
When the MODE pin is held low, the LTC3100 buck converter
uses a constant-frequency, current mode control architec-
ture. Both the main (P-channel MOSFET) and synchronous
rectifier (N-channel MOSFET) switches are internal. At
the start of each oscillator cycle, the P-channel switch
is turned on and remains on until the current waveform
with superimposed slope compensation ramp exceeds the
error amplifier output. At this point, the synchronous
rectifier is turned on and remains on until the inductor
current falls to zero or a new switching cycle is initiated.
As a result, the buck converter operates with discontinuous
inductor current at light loads which improves efficiency.
At extremely light loads, the minimum on-time of the main
switch will be reached and the buck converter will begin
turning off for multiple cycles (pulse-skipping) in order
to maintain regulation.
Burst Mode Operation
When the MODE pin is forced high, or left open, the buck
converter will automatically transition between Burst Mode
operation at sufficiently light loads (below approximately
10mA) and PWM mode at heavier loads. Burst Mode oper-
ation entry is determined by the peak inductor current and
therefore the load current at which Burst Mode operation
will be entered depends on the input voltage, the output
voltage and the inductor value. Typical curves for Burst
Mode operation entry threshold are provided in the Typical
Performance Characteristics section of this data sheet.
The quiescent current on V
INBK
in Burst Mode operation
is only 15礎. If the boost converter is enabled and V
INBST
or V
BST
are at a higher potential than V
INBK
, some of the
quiescent current will be supplied by the boost converter,
reducing the burst quiescent current on V
INBK
to just 9礎.
OPERATION
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| LTC3101EUF#PBF | 功能描述:IC BUCK/BST TRPL ADJ 350MA 24QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电源管理 - 专用 系列:PowerPath™ 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:50 系列:- 应用:热电冷却器 电流 - 电源:- 电源电压:3 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:28-SOIC（0.173"，4.40mm 宽）裸露焊盘 供应商设备封装:28-TSSOP 裸露焊盘 包装:管件 产品目录页面:1410 (CN2011-ZH PDF) |
| LTC3101EUF#TRPBF | 功能描述:IC BUCK/BST TRPL ADJ 350MA 24QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电源管理 - 专用 系列:PowerPath™ 标准包装:1 系列:- 应用:手持/移动设备 电流 - 电源:- 电源电压:3 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:14-WFDFN 裸露焊盘 供应商设备封装:14-LLP-EP（4x4） 包装:Digi-Reel® 配用:LP3905SD-30EV-ND - BOARD EVALUATION LP3905SD-30 其它名称:LP3905SD-30DKR |
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