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参数资料
| 型号： | LT3470IDDB#TRMPBF |
| 厂商： | Linear Technology |
| 文件页数： | 8/20页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 0.2A 8DFN |
| 标准包装： | 1 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 1.25 V ~ 16 V |
| 输入电压： | 4 V ~ 40 V |
| PWM 型： | Burst Mode? |
| 电流 - 输出： | 200mA |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-WFDFN 裸露焊盘 |
| 包装： | 标准包装 |
| 供应商设备封装： | 8-DFN（3x2） |
| 其它名称： | LT3470IDDB#TRMPBFDKR |
LT3470
OPERATION
The LT3470 uses a hysteretic control scheme in conjunction
with Burst Mode operation to provide low output ripple
and low quiescent current while using a tiny inductor and
capacitors.
Operation can best be understood by studying the Block
Diagram. An error amplifier measures the output voltage
through an external resistor divider tied to the FB pin. If
the FB voltage is higher than V REF , the error amplifier will
shut off all the high power circuitry, leaving the LT3470
in its micropower state. As the FB voltage falls, the error
amplifier will enable the power section, causing the chip
to begin switching, thus delivering charge to the output
capacitor. If the load is light the part will alternate between
micropower and switching states to keep the output in
regulation (See Figure 1a). At higher loads the part will
switch continuously while the error amp servos the top
and bottom current limits to regulate the FB pin voltage
to 1.25V (See Figure 1b).
The switching action is controlled by an RS latch and two
current comparators as follows: The switch turns on,
and the current through it ramps up until the top current
NO LOAD
V OUT
20mV/DIV
I L
100mA/DIV
1ms/DIV
10mA LOAD
V OUT
20mV/DIV
I L
100mA/DIV
comparator trips and resets the latch causing the switch
to turn off. While the switch is off, the inductor current
ramps down through the catch diode. When both the bot-
tom current comparator trips and the minimum off-time
one-shot expires, the latch turns the switch back on thus
completing a full cycle. The hysteretic action of this control
scheme results in a switching frequency that depends
on inductor value, input and output voltage. Since the
switch only turns on when the catch diode current falls
below threshold, the part will automatically switch slower
to keep inductor current under control during start-up or
short-circuit conditions.
The switch driver operates from either the input or from
the BOOST pin. An external capacitor and internal diode
is used to generate a voltage at the BOOST pin that is
higher than the input supply. This allows the driver to
fully saturate the internal bipolar NPN power switch for
efficient operation.
If the SHDN pin is grounded, all internal circuits are turned
off and V IN current reduces to the device leakage current,
typically a few nA.
200mA LOAD
V OUT
20mV/DIV
I L
100mA/DIV
1μs/DIV
150mA LOAD
V OUT
20mV/DIV
I L
100mA/DIV
5μs/DIV
(1a) Burst Mode Operation
3470 F01a
1μs/DIV
(1b) Continuous Operation
3470 F1b
Figure 1. Operating Waveforms of the LT3470 Converting 12V to 5V Using a 33μH Inductor and 10μF Output Capacitor
3470fd
8
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PDF描述 |
|---|---|
| LT3470ITS8#TRMPBF | IC REG BUCK ADJ 0.2A TSOT23-8 |
| MIC3172YM | IC REG MULTI CONFIG 1.25A 8SOIC |
| HCM24DRUS | CONN EDGECARD 48POS .156 DIP SLD |
| PM2110-330K | INDUCTOR TOROID 33UH 10% SMD |
| ESM10DRMN-S664 | CONN EDGECARD 20POS .156 WW |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3470ITS8 | 制造商:LINEAR 制造商全称:LINEAR 功能描述:Micropower Buck Regulator with Integrated Boost and Catch Diodes |
| LT3470ITS8#PBF | 制造商:Linear Technology 功能描述:Conv DC-DC Single Step Down 4V to 40V 8-Pin TSOT-23 制造商:Linear Technology 功能描述:IC BUCK REGULATOR 8-TSOT-23 制造商:Linear Technology 功能描述:SP-SWREG/Monolithic, Cut Tape 300mA, 40V Micropower Step-Down Reg in ThinSOT 制造商:Linear Technology 功能描述:IC, BUCK REGULATOR, 8-TSOT-23, Primary Input Voltage:40V, No. of Outputs:1, Output Voltage:16V, Output Current:200mA, No. of Pins:8, Operating Temperature Min:-40C, Operating Temperature Max:125C, MSL:MSL 1 - Unlimited , RoHS Compliant: Yes |
| LT3470ITS8#TR | 制造商:Linear Technology 功能描述:Conv DC-DC Single Step Down 4V to 40V 8-Pin TSOT-23 T/R 制造商:Linear Technology 功能描述:SP-SWREG/Monolithic, 300mA, 40V Micropower Step-Down Reg in ThinSOT |
| LT3470ITS8#TRM | 制造商:Linear Technology 功能描述:Conv DC-DC Single Step Down 4V to 40V 8-Pin TSOT-23 T/R |
| LT3470ITS8#TRMPBF | 功能描述:IC REG BUCK ADJ 0.2A TSOT23-8 RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:250 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V 输入电压:2.05 V ~ 6 V PWM 型:电压模式 频率 - 开关:2MHz 电流 - 输出:500mA 同步整流器:是 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:6-UFDFN 包装:带卷 (TR) 供应商设备封装:6-SON（1.45x1） 产品目录页面:1032 (CN2011-ZH PDF) 其它名称:296-25628-2 |
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