参数资料
| 型号： | LM2574BN |
| 厂商： | Micrel Inc |
| 文件页数： | 1/8页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 0.5A 8DIP |
| 标准包装： | 50 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 1.23 V ~ 37 V |
| 输入电压： | 4.75 V ~ 40 V |
| 频率 - 开关： | 52kHz |
| 电流 - 输出： | 500mA |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 通孔 |
| 封装/外壳： | 8-DIP（0.300"，7.62mm） |
| 包装： | 管件 |
| 供应商设备封装： | 8-PDIP |
LM2574
General Description
The LM2574 family is a series of easy to use ?xed and ad-
justable switching voltage regulators. The LM2574 contains
all of the active circuitry necessary to construct a stepdown
(buck) switching regulator and requires a minimum of external
components.
The LM2574 is available in 3.3V and 5V ?xed output ver-
sions, or an adjustable version with an output voltage range
of 1.23V to 37V. Output voltage is guaranteed to ±4% for
speci?ed input and load conditions.
The LM2574 can supply 0.5A while maintaining excellent
line and load regulation. The output switch includes cycle-
by-cycle current limiting, as well as thermal shutdown for full
protection under fault conditions.
An external shutdown connection selects operating or standby
modes. Standby current is less than 200μA.
Heat sinks are generally unnecessary due the regulator ’s
high ef?ciency. Adequate heat transfer is usually provided
by soldering all package pins to a printed circuit board.
The LM2574 includes internal frequency compensation and
an internal 52kHz ?xed frequency oscillator guaranteed to
±10% of the frequency.
Circuits constructed around the LM2574 use a standard
series of inductors which are available from several different
manufacturers.
All support documentation can be found on Micrel’s web site
at www.micrel.com.
Micrel, Inc.
LM2574
52kHz Simple 0.5A Buck Regulator
Features
? 3.3V, 5V, 12V, and adjustable output versions
? Adjustable version output 1.23V to 37V ±4% max. over
line and load conditions.
? Guaranteed 0.5A output current
? Wide input voltage, up to 40V
? Thermal shutdown and current limit protection
? Requires only 4 external components.
? Shutdown capability (standby mode)
? Low power standby mode < 200μA Typical
? High-ef?ciency
? 52kHz ?xed frequency internal oscillator
? Uses standard inductors
Applications
? Simple high-ef?ciency step-down (buck) regulator
? Ef?cient pre-regulator for linear regulators
? On-card switching regulators
? Positive to negative converter (buck-boost)
Typical Application
40V MAX
UNREGULATED
DC IN
C IN
22μF
V IN
PWR
GND
FB
LM2574
OUT
SIG ON/
GND OFF
330μH
11DQ05
REGULATED
OUTPUT
0.5A
C OU T
220μF
Figure 1. Fixed Output Regulator Circuit
Micrel, Inc. ? 2180 Fortune Drive ? San Jose, CA 95131 ? USA ? tel + 1 (408) 944-0800 ? fax + 1 (408) 474-1000 ? http://www.micrel.com
July 2005
1
M9999-072805
相关PDF资料 |
PDF描述 |
|---|---|
| LM2574N-ADJ | IC REG BUCK ADJ 0.5A 8DIP |
| LM2575BWM TR | IC REG BUCK ADJ 1A 24SOIC |
| LM2576BU TR | IC REG BUCK ADJ 3A TO263-5 |
| LM2588T-12/NOPB | IC REG MULTI CONFIG 12V TO220-7 |
| LM2594DADJG | IC REG BUCK ADJ 0.5A 8SOIC |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LM2574BWM | 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:RF Micro Devices Inc 功能描述: 制造商:Micrel Inc 功能描述: |
| LM2574DW | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:0.5 A, Adjustable Output Voltage, Step-Down Switching Regulator |
| LM2574DW-ADJ | 功能描述:直流/直流开关调节器 500mA Adj. Step Down RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| LM2574DW-ADJR2 | 功能描述:直流/直流开关调节器 500mA Adj. Step Down RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| LM2574DW-ADJR2G | 功能描述:直流/直流开关调节器 500mA Adj. Step Down RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
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