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| 型号： | LTC3100EUD#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 12/26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
12
3100fb
For more information www.linear.com/LTC3100
OPERATION
The LTC3100 includes an 700mA synchronous step-up
(boost) converter, a 250mA synchronous step-down
(buck) converter and a 100mA low dropout (LDO) linear
regulator housed in a 16-lead 3mm ?3mm QFN package.
Both converters utilize current mode PWM control for
exceptional line and load regulation and operate from the
same 1.5MHz oscillator. The current mode architecture
with adaptive slope compensation also provides excellent
transient load response, requiring minimal output filter-
ing. Both converters have internal soft-start and internal
loop compensation, simplifying the design process and
minimizing the number of external components.
With its low R
DS(ON)
and low gate charge internal MOSFET
switches and synchronous rectifiers, the LTC3100 achieves
high efficiency over a wide range of load current. Burst
Mode operation maintains high efficiency at very light
loads, but can be disabled for noise-sensitive applications.
With separate power inputs for the boost and buck con-
verters, along with independent enable and power good
functions, the LTC3100 is very flexible. The two converters
can operate from the same input supply, or from two
different sources, or can even be cascaded by powering
the buck converter from the output of the boost converter.
By using the LDO as well, three different output voltages
can be generated from a single alkaline/NiMH cell (or the
LDO can be used for power sequencing the boost output).
Operation can be best understood by referring to the
Block Diagram.
BOOST CONVERTER
Low Voltage Start-Up
The LTC3100 boost converter includes an independent
start-up oscillator designed to start up at an input voltage
of 0.65V (typical). Soft-start and inrush current limiting
are provided during start-up, as well as in normal mode.
When either V
INBST
or V
BST
exceeds 1.4V (typical), the IC
enters normal operating mode. Once the output voltage
exceeds the input by 0.24V, the IC powers itself from
V
BST
instead of V
INBST
. At this point, the internal circuitry
has no dependency on the input voltage, eliminating the
requirement for a large input capacitor. The limiting fac-
tor for the application becomes the ability of the power
source to supply sufficient energy to the output at low
input voltages, and maximum duty cycle of the converter,
which is clamped at 90% (typical). Note that at low input
voltages, even small input voltage drops due to series
resistance become critical, and greatly limit the power
delivery capability of the converter.
LOW NOISE FIXED FREQUENCY OPERATION
Soft-Start
The internal soft-start circuitry ramps the peak boost
inductor current from zero to its peak value of 700mA in
approximately 800祍, allowing start-up into heavy loads.
The soft-start circuitry is reset in the event of a commanded
shutdown or an overtemperature shutdown.
Oscillator
An internal oscillator sets the switching frequency to
1.5MHz. The oscillator allows a maximum duty cycle of
90% (typical) for the boost converter.
Shutdown
The boost converter is shut down by pulling the RUNBST
pin below 0.3V, and activated by pulling the RUNBST pin
above 0.9V. Note that RUNBST can be driven above V
IN
or V
OUT
, as long as it is limited to less than the absolute
maximum rating.
Error Amplifier
The error amplifier is a transconductance type. The non-in-
verting input is internally connected to the 1.20V reference
and the inverting input is connected to FBBST. Clamps limit
the minimum and maximum error amp output voltage for
improved large signal transient response. Power converter
control loop compensation is provided internally. A voltage
divider from V
BST
to ground programs the output voltage
(via FBBST) from 1.5V to 5.25V, according to the formula:
V
BST
=1.20V" 1+
R2
R1
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC3100EUD-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:1.5MHz Synchronous Dual Channel DC/DC Converter and 100mA LDO |
| LTC3101 | 制造商:LINER 制造商全称:Linear Technology 功能描述:8-Output Regulator with Sequencing and I2C |
| LTC3101_10 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Wide VIN, Multi-Output DC/DC Converter and PowerPath Controller |
| 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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