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| 型号： | LTC1147LCS8#TR |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, 400 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封装： | 0.150 INCH, PLASTIC, SO-8 |
| 文件页数： | 1/16页 |
| 文件大小： | 217K |
| 代理商： | LTC1147LCS8#TR |
1
LTC1147-3.3
LTC1147-5/LTC1147L
sn1147 1147fds
High Efficiency Step-Down
Switching Regulator Controllers
Figure 1. High Efficiency Step-Down Converter
U
A
O
PPLICATI
TYPICAL
, LTC and LT are registered trademarks of Linear Technology Corporation.
0V = NORMAL
>1.5V = SHUTDOWN
P-CHANNEL
Si4431DY
+
1
F
L*
50
H
RSENSE**
0.05
VOUT
5V/2A
+
CIN
100
F
VIN (5.2V TO 14V)
ITH
CT
470pF
CC
3300pF
RC
1k
+
COUT
390
F
D1
MBRD330
LT1147 F01
GND
VIN
PDRIVE
LTC1147-5
SHDN
SENSE+
SENSE–
1000pF
COILTRONICS CTX50-2-MP
KRL SL-1-C1-0R050J
*
**
LOAD CURRENT (A)
0.001
70
EFFICIENCY
(%)
90
95
100
0.01
0.1
1
LT1147 TA01
85
80
75
VIN = 6V
VIN = 10V
LTC1147-5 Efficiency
s
Very High Efficiency: Over 95% Possible
s
Wide VIN Range: 3.5V* to 16V
s
Current Mode Operation for Excellent Line and Load
Transient Response
s
High Efficiency Maintained Over Three Decades of
Output Current
s
Low 160
A Standby Current at Light Loads
s
Logic Controlled Micropower Shutdown: IQ < 20A
s
Short-Circuit Protection
s
Very Low Dropout Operation: 100% Duty Cycle
s
High Efficiency in a Small Amount of Board Space
s
Output Can Be Externally Held High in Shutdown
s
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 RDS(ON) of the external MOSFET
and resistance of the inductor and current sense resistor.
The LTC1147 series incorporates automatic power saving
Burst Mode operation to reduce switching losses when
load currents drop below the level required for continuous
operation. Standby power is reduced to only 2mW at
VIN = 10V (at IOUT = 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.
Burst Mode is a trademark of Linear Technology Corporation.
*LTC1147L and LTC1147L-3.3 only.
FEATURES
DESCRIPTIO
U
APPLICATIO S
U
s
Notebook and Palmtop Computers
s
Portable Instruments
s
Battery-Operated Digital Devices
s
Cellular Telephones
s
DC Power Distribution Systems
s
GPS Systems
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC1147LIS8 | 功能描述:IC REG CTRLR BUCK PWM CM 8-SOIC 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:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 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:24-WQFN 裸露焊盘 包装:带卷 (TR) |
| LTC1147LIS8#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 8-SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 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:24-WQFN 裸露焊盘 包装:带卷 (TR) |
| LTC1147LIS8#TR | 功能描述:IC REG CTRLR BUCK PWM CM 8-SOIC 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:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 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:24-WQFN 裸露焊盘 包装:带卷 (TR) |
| LTC1147LIS8#TRPBF | 功能描述:IC REG CTRLR BUCK PWM CM 8-SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 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:24-WQFN 裸露焊盘 包装:带卷 (TR) |
| LTC1148 | 制造商:LINER 制造商全称:Linear Technology 功能描述:High Efficiency Synchronous Step-Down Switching Regulators |
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