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参数资料
| 型号： | LT3580IDD#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 6/28页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST INV SEPIC 2A 8DFN |
| 标准包装： | 121 |
| 类型： | 升压（升压），反相，Sepic |
| 输出数： | 1 |
| 输入电压： | 2.5 V ~ 32 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 200kHz ~ 2.5MHz |
| 电流 - 输出： | 2A |
| 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： | 管件 |
| 供应商设备封装： | 8-DFN-EP（3x3） |
| 产品目录页面： | 1332 (CN2011-ZH PDF) |
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LT3580
BLOCK DIAGRAM
R C
V IN
C SS
C C
C IN
SHDN
7
SS
2
VC
5
–
1.3V
+
DISCHARGE
DETECT
L1
275k
3
V IN
UVLO
1.215V
REFERENCE
SR2
R
Q
S
Q2
SOFT-
START
VC
I LIMIT
–
+
COMPARATOR
A3 R
SR1
S
Q
DRIVER
Q1
SW
4
D1
C1
V OUT
+
+
R FB
FB
14.6k
–
A1
∑
RAMP
GENERATOR
A4
–
0.01Ω
GND
1
14.6k
+
A2
FREQUENCY
FOLDBACK
÷N ADJUSTABLE
OSCILLATOR
9
–
SYNC
BLOCK
SYNC
8
6
RT
R T
3580 BD
OPERATION
The LT3580 uses a constant-frequency, current mode con-
trol scheme to provide excellent line and load regulation.
Refer to the Block Diagram which shows the LT3580 in a
boost configuration. At the start of each oscillator cycle,
the SR latch (SR1) is set, which turns on the power switch,
Q1. The switch current flows through the internal current
sense resistor generating a voltage proportional to the
switch current. This voltage (amplified by A4) is added
to a stabilizing ramp and the resulting sum is fed into the
positive terminal of the PWM comparator A3. When this
voltage exceeds the level at the negative input of A3, the SR
latch is reset, turning off the power switch. The level at the
negative input of A3 (VC pin) is set by the error amplifier A1
(or A2) and is simply an amplified version of the difference
between the feedback voltage (FB pin) and the reference
voltage (1.215V or 5mV depending on the configuration).
In this manner, the error amplifier sets the correct peak
current level to keep the output in regulation.
The LT3580 has a novel FB pin architecture that can be
used for either boost or inverting configurations. When
configured as a boost converter, the FB pin is pulled up
to the internal bias voltage of 1.215V by the R FB resistor
connected from V OUT to FB. Comparator A2 becomes
inactive and comparator A1 performs the inverting
amplification from FB to VC. When the LT3580 is in an
inverting configuration, the FB pin is pulled down to 5mV
by the R FB resistor connected from V OUT to FB. Comparator
A1 becomes inactive and comparator A2 performs the
noninverting amplification from FB to VC.
3580fg
6
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3580IDD-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Boost/Inverting DC/DC Converter with 2A Switch, Soft-Start, and Synchronization |
| LT3580IMS8E | 制造商:LINER 制造商全称:Linear Technology 功能描述:Boost/Inverting DC/DC Converter with 2A Switch, Soft-Start, and Synchronization |
| LT3580IMS8E#PBF | 功能描述:IC REG BOOST INV SEPIC 2A 8MSOP 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 |
| LT3580IMS8E#TRPBF | 功能描述:IC REG BOOST INV SEPIC 2A 8MSOP 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:2,500 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 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:10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
| LT3580IMS8EPBF | 制造商:Linear Technology 功能描述:DC-DC Converter Inv/Step-Up 32V MSOP8EP |
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