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参数资料
| 型号： | LTC1148CS-3.3#TR |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, 250 kHz SWITCHING FREQ-MAX, PDSO14 |
| 封装： | 0.150 INCH, PLASTIC, SOP-14 |
| 文件页数： | 1/20页 |
| 文件大小： | 237K |
| 代理商： | LTC1148CS-3.3#TR |
1
LTC1148
LTC1148-3.3/LTC1148-5
114835fd
High Efficiency Synchronous
Step-Down Switching Regulators
LOAD CURRENT (A)
0.02
80
EFFICIENCY
(%)
85
90
100
0.2
2
LTC1148 TA01
95
VIN = 6V
VIN = 10V
LTC1148-5 Efficiency
■
Ultrahigh Efficiency: Over 95% Possible
■ Current-Mode Operation for Excellent Line and Load
Transient Response
■
High Efficiency Maintained Over Three Decades of
Output Current
■ Low 160A Standby Current at Light Loads
■
Logic Controlled Micropower Shutdown: IQ < 20A
■ Wide VIN Range: 3.5V* to 20V
■ Short-Circuit Protection
■
Very Low Dropout Operation: 100% Duty Cycle
■ Synchronous FET Switching for High Efficiency
■ Adaptive Nonoverlap Gate Drives
■
Output Can Be Externally Held High in Shutdown
■ Available in 14-Pin Narrow SO Package
The LTC
1148 series is a family of synchronous step-
down switching regulator controllers featuring automatic
Burst Mode
TM operation to maintain high efficiencies at
low output currents. These devices drive external comple-
mentary power MOSFETs at switching frequencies up to
250kHz using a constant off-time current-mode architec-
ture 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 18V (20V 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 LTC1148 series combines synchronous switching for
maximum efficiency at high currents with an automatic low
current operating mode, called Burst Modeoperation, which
reduces switching losses. 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 operation up to 48V input, see the LTC1149 and
LTC1159 data sheets and Application Note 54.
Figure 1. High Efficiency Step-Down Converter
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode is a trademark of Linear Technology Corporation.
* LTC1148L and LTC1148L-3.3 only.
Protected by U.S. Patents, including 6580258, 5481178.
■ Notebook and Palmtop Computers
■ Portable Instruments
■ Battery-Operated Digital Devices
■ Cellular Telephones
■ DC Power Distribution Systems
■ GPS Systems
0V = NORMAL
>1.5V = SHUTDOWN
P-CHANNEL
Si4431DY
+
1F
L*
62H
RSENSE**
0.05
VOUT
5V/2A
+
CIN
100F
VIN (5.2V TO 18V)
ITH
CT
SGND
CT
470pF
CC
3300pF
RC
1k
+
COUT
390F
D1
MBRS140T3
LT1148 TA01
N-DRIVE
PGND
N-CHANNEL
Si4412DY
VIN
P-DRIVE
LTC1148HV-5
SHUTDOWN
SENSE+
SENSE–
1000pF
COILTRONICS CTX62-2-MP
KRL SL-1-C1-0R050J
*
**
FEATURES
DESCRIPTIO
U
APPLICATIO S
U
TYPICAL APPLICATIO
U
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC1148CS5 | 制造商:LT 功能描述:HOUSE MARKED |
| LTC1148CS-5 | 功能描述:IC REG CTRLR BUCK PWM CM 14-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: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 |
| LTC1148CS-5#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 14-SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 特色产品:LM3753/54 Scalable 2-Phase Synchronous Buck Controllers 标准包装:1 系列:PowerWise® PWM 型:电压模式 输出数:1 频率 - 最大:1MHz 占空比:81% 电源电压:4.5 V ~ 18 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:-5°C ~ 125°C 封装/外壳:32-WFQFN 裸露焊盘 包装:Digi-Reel® 产品目录页面:1303 (CN2011-ZH PDF) 其它名称:LM3754SQDKR |
| LTC1148CS-5#TR | 功能描述:IC REG CTRLR BUCK PWM CM 14-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: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 |
| LTC1148CS-5#TRPBF | 功能描述:IC REG CTRLR BUCK PWM CM 14-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: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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