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参数资料
| 型号： | LT1176CSW-5#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 1/8页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK INV FLYBACK 20SOIC |
| 标准包装： | 38 |
| 类型： | 降压（降压），反相，回扫 |
| 输出类型： | 固定 |
| 输出数： | 1 |
| 输出电压： | 5V |
| 输入电压： | 8 V ~ 35 V |
| 频率 - 开关： | 100kHz |
| 电流 - 输出： | 1A |
| 同步整流器： | 无 |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-SOIC（0.295"，7.50mm 宽） |
| 包装： | 管件 |
| 供应商设备封装： | 20-SOIC |
| 产品目录页面： | 1326 (CN2011-ZH PDF) |
LT1176/LT1176-5
Step-Down
Switching Regulator
1.2A Onboard Switch
100kHz Switching Frequency
Excellent Dynamic Behavior
DIP and Surface Mount Packages
Only 8mA Quiescent Current
Preset 5V Output Available
Operates Up to 35V Input
Micropower Shutdown Mode
Buck Converter with Output Voltage Range of
Positive-to-Negative Converter
Negative Boost Converter
Multiple Output Buck Converter
FEATURES
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APPLICATIONS
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2.5V to 30V
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DESCRIPTION
The LT ? 1176 is a 1A monolithic bipolar switching regulator
which requires only a few external parts for normal opera-
tion. The power switch, all oscillator and control circuitry
TYPICAL APPLICATION
Basic 5V Positive Buck Converter
and all current limit components are included on the chip.
The topology is a classic positive buck configuration but
several design innovations allows this device to be used as
a positive-to-negative converter, a negative boost converter,
and as a flyback converter. The switch output is specified
to swing below ground.
The LT1176 uses a true analog multiplier in the feedback
loop. This makes the device respond nearly instantaneously
to input voltage fluctuations and makes loop gain indepen-
dent of input voltage. As a result, dynamic behavior of the
regulator is significantly improved over previous designs.
On-chip pulse by pulse current limiting makes the LT1176
nearly bust proof for output overloads or shorts. The input
voltage range as a buck converter is 8V to 35V, but a self
boot feature allows input voltages as low as 5V in the
inverting and boost configurations.
The LT1176 is available in a low cost 8-lead DIP package
with frequency preset at 100kHz and current limit at 1.7A.
An adjustable output is offered as well as a preset 5V ver-
sion. For further design details and application help, see
the LT1074/LT1076 data sheet and Application Note 44.
L , LT, LTC, LTM, Linear Technology, SwitcherCAD and the Linear logo are registered
trademarks of Linear Technology Corporation. All other trademarks are the property of their
respective owners.
5V Buck Converter Efficiency
10V T0 35V
V IN
V SW
L1*
100μH
5V, 0.8A
90
L = 100μH ON MAGNETICS INC.
SIZE T-50 KOOL Mμ CORE
+
LT1176-5
SENSE
GND V C
R3
2.7k
C3 C2
100μF 0.01μF
1N5819
+
C1
470μF
25V
80
70
V IN = 10V
V IN = 20V
PULSE ENGINEERING, INC. #PE-92102
*COILTRONICS#100-1-52
11765 TA01
HURRICANE #HL-AG210LL
THESE ARE LOW COST POWDERED IRON CORES. OPTIMUM EFFICIENCY
AND SMALLEST SIZE IS OBTAINED BY USING A LOW LOSS CORE SUCH
AS MAGNETICS INC. KOOL Mμ. SEE EFFICIENCY GRAPH.
60
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
LOAD CURRENT (A)
11765 TA02
11765fb
1
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