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参数资料
| 型号： | LT3580MPMS8E#TRPBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 2.8 A SWITCHING REGULATOR, 2500 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封装： | LEAD FREE, PLASTIC, MSOP-8 |
| 文件页数： | 25/28页 |
| 文件大小： | 289K |
| 代理商： | LT3580MPMS8E#TRPBF |
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LT3580
6
3580fg
BLOCK DIAGRAM
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 RFB resistor
connected from VOUT 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 RFB resistor connected from VOUT to FB. Comparator
A1 becomes inactive and comparator A2 performs the
noninverting amplification from FB to VC.
–
+
–
+
–
+
–
+
–
∑
7
5
3
1.215V
REFERENCE
ADJUSTABLE
OSCILLATOR
FREQUENCY
FOLDBACK
RAMP
GENERATOR
COMPARATOR
DISCHARGE
DETECT
SS
VC
275k
Q2
SR2
R
S
14.6k
Q
SR1
A3
A4
A1
A2
SYNC
÷N
RT
SHDN
FB
1.3V
VC
C1
SW
0.01Ω
GND
RT
RFB
DRIVER
L1
D1
ILIMIT
VIN
VOUT
CSS
CC
CIN
RC
VIN
SOFT-
START
SYNC
BLOCK
UVLO
R
S
Q
6
2
1
3580 BD
8
4
Q1
9
OPERATION
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| LT3582EUD#TRPBF | 0.72 A SWITCHING REGULATOR, PQCC16 |
| LT3582EUD-12#TRPBF | 0.72 A SWITCHING REGULATOR, PQCC16 |
| LT3582EUD#PBF | 0.72 A SWITCHING REGULATOR, PQCC16 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3581 | 制造商:LINER 制造商全称:Linear Technology 功能描述:3.3A Boost/Inverting DC/DC Converter with Fault Protection |
| LT3581EDE#PBF | 功能描述:IC REG MULTI CONFIG ADJ 14DFN 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 |
| LT3581EDE#TRPBF | 功能描述:IC REG MULTI CONFIG ADJ 14DFN 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 |
| LT3581EDE-PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:3.3A Boost/Inverting DC/DC Converter with Fault Protection |
| LT3581EDE-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:3.3A Boost/Inverting DC/DC Converter with Fault Protection |
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