- 您现在的位置：买卖IC网 > PDF目录15274 > LTC1149CS-5#PBF (Linear Technology)IC REG CTRLR BUCK PWM CM 16-SOIC PDF资料下载
参数资料
| 型号： | LTC1149CS-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-SOIC |
| 标准包装： | 50 |
| 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： | 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： | 0°C ~ 70°C |
| 封装/外壳： | 16-SOIC（0.154"，3.90mm 宽） |
| 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 |
|---|---|
| LTC1149CS-5 | IC REG CTRLR BUCK PWM CM 16-SOIC |
| EYM22DRST | CONN EDGECARD 44POS DIP .156 SLD |
| EGM22DRST | CONN EDGECARD 44POS DIP .156 SLD |
| LTC3708EUH | IC REG CTRLR BUCK PWM CM 32-QFN |
| LTC3802EUH#PBF | IC REG CTRLR BUCK PWM VM 32-QFN |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC1149CSPBF | 制造商:Linear Technology 功能描述:DC-DC Controller Step-Down 48V SOIC16 |
| LTC1150 | 制造商:LINER 制造商全称:Linear Technology 功能描述:15V CHOPPER STABILIZED OPERATIONAL AMPLIFIER WITH INTERNAL CAPACITORS |
| LTC1150_03 | 制造商:LINER 制造商全称:Linear Technology 功能描述:【15V Zero-Drift Operational Amplifier with Internal Capacitors |
| LTC1150C | 制造商:LINER 制造商全称:Linear Technology 功能描述:+-15V Chopper Stabilized Operational Amplifier with Internal Capacitors |
| LTC1150CH | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Chopper-Stabilized Operational Amplifier |
发布紧急采购，3分钟左右您将得到回复。