参数资料
型号: LTC1149CN-5#PBF
厂商: Linear Technology
文件页数: 1/20页
文件大小: 0K
描述: IC REG CTRLR BUCK PWM CM 16-DIP
标准包装: 25
PWM 型: 电流模式
输出数: 1
频率 - 最大: 250kHz
占空比: 100%
电源电压: 最高 48V
降压:
升压:
回扫:
反相:
倍增器:
除法器:
Cuk:
隔离:
工作温度: 0°C ~ 70°C
封装/外壳: 16-DIP(0.300",7.62mm)
包装: 管件
LTC1149
LTC1149-3.3/LTC1149-5
High Efficiency Synchronous
Step-Down Switching Regulators
FEATURE S
D ESCRIPTIO
s
s
s
s
s
s
s
s
s
s
Operation to 48V Input Voltage
Ultrahigh Efficiency: Up to 95%
Current Mode Operation for Excellent Line and
Load Transient Response
High Efficiency Maintained over Wide Current Range
Logic-Controlled Micropower Shutdown
Short-Circuit Protection
Very Low Dropout Operation: 100% Duty Cycle
Synchronous FET Switching for High Efficiency
Adaptive Nonoverlap Gate Drives
Available in 16-Pin Narrow SO Package
The LTC ? 1149 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 archi-
tecture.
Special onboard regulation and level-shift circuitry allow
operation at input voltages from dropout to 48V (60V
absolute max). The constant off-time architecture main-
tains constant ripple current in the inductor, easing the
A PPLICATI
S
design of wide input range converters. Current mode
operation provides excellent line and load transient
s
s
s
s
s
s
Notebook and Palmtop Computers
Portable Instruments
Battery-Operated Digital Devices
Industrial Power Distribution
Avionics Systems
Telecom Power Supplies
, LTC and LT are registered trademarks of Linear Technology Corporation.
response. The operating current level is user-program-
mable via an external current sense resistor.
The LTC1149 series incorporates automatic power saving
Burst Mode operation when load currents drop below the
level required for continuous operation. Standby power is
reduced to only about 8mW at V IN = 12V. In shutdown,
both MOSFETs are turned off.
Burst Mode is a trademark of Linear Technology Corporation.
TYPICAL A PPLICATI
V IN
1N4148
0.068 μ F
CAP
V IN
PGATE
1N4148
P-CHANNEL
IRFR9024
+
C IN
100 μ F
100V
100
LTC1149-5 Efficiency
FIGURE 1 CIRCUIT
V IN = 12V
+
3.3 μ F
V CC
V CC
PDRIVE
LTC1149-5
0.047 μ F
D1
1N5819
L*
62 μ H
R SENSE **
0.05 ?
V OUT
5V/2A
90
80
V IN = 24V
0V = NORMAL
>2V = SHUTDOWN
3300 μ F
1k
C T
470pF
SHDN1
SHDN2
I TH
C T
SGND
SENSE +
SENSE –
NGATE
P, RGNDS
1000pF
N-CHANNEL
IRFR024
+
C OUT
220 μ F
70
60
*COILTRONICS CTX62-2-MP
**KRL SL-1-C1-0R050J
1149 F01
0.02
0.2
LOAD CURRENT (A)
2
1149 TA01
Figure 1. High Efficiency Step-Down Regulator
1
相关PDF资料
PDF描述
H2AXT-10112-S4-ND JUMPER-H1502TR/A2015S/X 12"
LTC1149CN-5 IC REG CTRLR BUCK PWM CM 16-DIP
B41042A3128M 1200UF 10V 10X25 SINGLE END
LTC1149CN#PBF IC REG CTRLR BUCK PWM CM 16-DIP
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参数描述
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LTC1149CS#PBF 功能描述:IC REG CTRLR BUCK PWM CM 16-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
LTC1149CS#TR 功能描述:IC REG CTRLR BUCK PWM CM 16-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
LTC1149CS#TRPBF 功能描述:IC REG CTRLR BUCK PWM CM 16-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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