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参数资料
| 型号： | LTC1147LIS8#TR |
| 厂商： | Linear Technology |
| 文件页数： | 1/16页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM CM 8-SOIC |
| 标准包装： | 2,500 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 占空比： | 100% |
| 电源电压： | 3.5 V ~ 14 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 包装： | 带卷 (TR) |
LTC1147-3.3
LTC1147-5/LTC1147L
High Efficiency Step-Down
Switching Regulator Controllers
FEATURES
DESCRIPTIO
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Very High Efficiency: Over 95% Possible
Wide V IN Range: 3.5V* to 16V
Current Mode Operation for Excellent Line and Load
Transient Response
High Efficiency Maintained Over Three Decades of
Output Current
Low 160 μ A Standby Current at Light Loads
Logic Controlled Micropower Shutdown: I Q < 20 μ A
Short-Circuit Protection
Very Low Dropout Operation: 100% Duty Cycle
High Efficiency in a Small Amount of Board Space
Output Can Be Externally Held High in Shutdown
Available in 8-Pin SO Package
The LTC ? 1147 series are step-down switching regulator
controllers featuring automatic Burst Mode TM operation to
maintain high efficiencies at low output currents. These
devices drive an external P-channel power MOSFET at
switching frequencies exceeding 400kHz using a constant
off-time current mode architecture providing constant
ripple current in the inductor.
The operating current level is user-programmable via an
external current sense resistor. Wide input supply range
allows operation from 3.5V* to 14V (16V maximum).
Constant off-time architecture provides low dropout regu-
lation limited by only the R DS(ON) of the external MOSFET
and resistance of the inductor and current sense resistor.
APPLICATIO S
The LTC1147 series incorporates automatic power saving
Burst Mode operation to reduce switching losses when
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Notebook and Palmtop Computers
Portable Instruments
Battery-Operated Digital Devices
Cellular Telephones
DC Power Distribution Systems
GPS Systems
load currents drop below the level required for continuous
operation. Standby power is reduced to only 2mW at
V IN = 10V (at I OUT = 0). Load currents in Burst Mode
operation are typically 0mA to 300mA.
For applications where even higher efficiency is required,
refer to the LTC1148 data sheet and Application Note 54.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode is a trademark of Linear Technology Corporation.
*LTC1147L and LTC1147L-3.3 only.
TYPICAL A PPLICATI
C T
C C
SENSE –
Si4431DY
+
1 μ F
0V = NORMAL
>1.5V = SHUTDOWN
R C
1k
470pF
3300pF
V IN (5.2V TO 14V)
V IN
PDRIVE
LTC1147-5
SHDN
SENSE +
I TH
C T
GND
P-CHANNEL
L*
50 μ H
1000pF
D1
MBRD330
+
C IN
100 μ F
R SENSE **
0.05 ?
+
V OUT
5V/2A
C OUT
390 μ F
LT1147 ? F01
100
95
90
85
80
75
LTC1147-5 Efficiency
V IN = 6V
V IN = 10V
* COILTRONICS CTX50-2-MP
** KRL SL-1-C1-0R050J
70
0.001
0.01
0.1
1
LOAD CURRENT (A)
LT1147 ? TA01
Figure 1. High Efficiency Step-Down Converter
sn1147 1147fds
1
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC1148 | 制造商:LINER 制造商全称:Linear Technology 功能描述:High Efficiency Synchronous Step-Down Switching Regulators |
| LTC1148_04 | 制造商:LINER 制造商全称:Linear Technology 功能描述:High Efficiency Synchronous Step-Down Switching Regulators |
| LTC1148-3.3 | 制造商:LINER 制造商全称:Linear Technology 功能描述:High Efficiency Synchronous Step-Down Switching Regulators |
| LTC1148-5 | 制造商:LINER 制造商全称:Linear Technology 功能描述:High Efficiency Synchronous Step-Down Switching Regulators |
| LTC1148CN | 功能描述:IC REG CTRLR BUCK PWM CM 14-DIP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:4,500 系列:PowerWise® PWM 型:控制器 输出数:1 频率 - 最大:1MHz 占空比:95% 电源电压:2.8 V ~ 5.5 V 降压:是 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:6-WDFN 裸露焊盘 包装:带卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名称:LM1771SSDX |
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