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| 型号： | LT1576IS8-SYNC#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 1/28页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 1.5A 8SOIC |
| 标准包装： | 100 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 可调至 1.2V |
| 输入电压： | 5 V ~ 25 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 200kHz |
| 电流 - 输出： | 1.5A |
| 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-SOIC（0.154"，3.90mm 宽） |
| 包装： | 管件 |
| 供应商设备封装： | 8-SOIC |
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LT1576/LT1576-5
1.5A, 200kHz Step-Down
Switching Regulator
FEATURES
DESCRIPTIO
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Constant 200kHz Switching Frequency
1.21V Reference Voltage
Fixed 5V Output Option
Easily Synchronizable
Uses All Surface Mount Components
Inductor Size Reduced to 15 μ H
Saturating Switch Design: 0.2 ?
Effective Supply Current: 1.16mA
Shutdown Current: 20 μ A
Cycle-by-Cycle Current Limiting
Fused Lead SO-8 Package
The LT ? 1576 is a 200kHz monolithic buck mode switching
regulator. A 1.5A switch is included on the die along with
all the necessary oscillator, control and logic circuitry. The
topology is current mode for fast transient response and
good loop stability. The LT1576 is a modified version of the
industry standard LT1376 optimized for noise sensitive
applications.
In addition, the reference voltage has been lowered to
allow the device to produce output voltages down to 1.2V.
Quiescent current has been reduced by a factor of two.
Switch on resistance has been reduced by 30%. Switch tran-
sition times have been slowed to reduce EMI generation.
APPLICATIO S
The oscillator frequency has been reduced to 200kHz to
maintain high efficiency over a wide output current range.
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Portable Computers
Battery-Powered Systems
Battery Charger
Distributed Power
The pinout has been changed to improve PC layout by
allowing the high current high frequency switching cir-
cuitry to be easily isolated from low current noise sensitive
control circuitry. The new SO-8 package includes a fused
ground lead which significantly reduces the thermal resis-
tance of the device to extend the ambient operating tem-
perature range. There is an optional function of shutdown
or synchronization. Standard surface mount external parts
can be used including the inductor and capacitors.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO N
Efficiency vs Load Current
5V Buck Converter
100
C3*
INPUT
6V TO 25V
10 μ F TO
50 μ F
+
V IN
BOOST
C2
0.33 μ F
V SW
L1**
15 μ H
D2
1N914
OUTPUT**
5V, 1.25A
95
90
V OUT = 5V
V IN = 10V
L = 33 μ H
LT1576
BIAS
85
OPEN = ON
SHDN
FB
GND
V C
D1
R1
80
* RIPPLE CURRENT RATING ≥ I OUT /2
** INCREASE L1 TO 30 μ H FOR LOAD
CURRENTS ABOVE 0.6A AND TO
60 μ H ABOVE 1A
SEE APPLICATIONS INFORMATION
C C
100pF
1N5818
15.8k
R2 +
4.99k
C1
100 μ F, 10V
SOLID
TANTALUM
75
70
0
0.25
0.50 0.75 1.00
1.25
1.50
1576 TA01
LOAD CURRENT (A)
1576 TA02
1
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相关代理商/技术参数 |
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| LT1577 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Ultrafast Transient Response, Low Dropout Regulators Adjustable and Fixed |
| LT1577CS-3.3/2.8 | 功能描述:IC REG CTRLR DUAL OUT 16SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性晶体管驱动器 系列:- 产品培训模块:More Information on LDOs 标准包装:2,500 系列:- 类型:正，固定式 输出数:2 输出电压:2.8V，3.3V 电流 - 电源:12mA 输入电压:5 V ~ 22 V 工作温度:0°C ~ 70°C 封装/外壳:16-SOIC（0.154"，3.90mm 宽） 供应商设备封装:16-SOIC 包装:带卷 (TR) |
| LT1577CS-3.3/2.8#PBF | 功能描述:IC REG CTRLR DUAL OUT 16SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性晶体管驱动器 系列:- 产品培训模块:More Information on LDOs 标准包装:2,500 系列:- 类型:正，固定式 输出数:2 输出电压:2.8V，3.3V 电流 - 电源:12mA 输入电压:5 V ~ 22 V 工作温度:0°C ~ 70°C 封装/外壳:16-SOIC（0.154"，3.90mm 宽） 供应商设备封装:16-SOIC 包装:带卷 (TR) |
| LT1577CS-3.3/2.8#TR | 功能描述:IC REG CTRLR DUAL OUT 16SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性晶体管驱动器 系列:- 产品培训模块:More Information on LDOs 标准包装:2,500 系列:- 类型:正，固定式 输出数:2 输出电压:2.8V，3.3V 电流 - 电源:12mA 输入电压:5 V ~ 22 V 工作温度:0°C ~ 70°C 封装/外壳:16-SOIC（0.154"，3.90mm 宽） 供应商设备封装:16-SOIC 包装:带卷 (TR) |
| LT1577CS-3.3/2.8#TRPBF | 功能描述:IC REG CTRLR DUAL OUT 16SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性晶体管驱动器 系列:- 产品培训模块:More Information on LDOs 标准包装:2,500 系列:- 类型:正，固定式 输出数:2 输出电压:2.8V，3.3V 电流 - 电源:12mA 输入电压:5 V ~ 22 V 工作温度:0°C ~ 70°C 封装/外壳:16-SOIC（0.154"，3.90mm 宽） 供应商设备封装:16-SOIC 包装:带卷 (TR) |
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