參數(shù)資料
型號(hào)： LTC1149
廠商： Linear Technology Corporation
元件分類(lèi)： 基準(zhǔn)電壓源/電流源
英文描述： RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS
中文描述： 抗輻射高效，5安培開(kāi)關(guān)穩(wěn)壓器
文件頁(yè)數(shù)： 1/20頁(yè)
文件大?。?/td> 389K
代理商： LTC1149
1
LTC1149
LTC1149-3.3/LTC1149-5
High Efficiency Synchronous
Step-Down Switching Regulators
S
FEATURE
D
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
design of wide input range converters. Current mode
operation provides excellent line and load transient
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.
U
ESCRIPTIO
I
Operation to 48V Input Voltage
I
Ultrahigh Efficiency: Up to 95%
I
Current Mode Operation for Excellent Line and
Load Transient Response
I
High Efficiency Maintained over Wide Current Range
I
Logic-Controlled Micropower Shutdown
I
Short-Circuit Protection
I
Very Low Dropout Operation: 100% Duty Cycle
I
Synchronous FET Switching for High Efficiency
I
Adaptive Nonoverlap Gate Drives
I
Available in 16-Pin Narrow SO Package
Figure 1. High Efficiency Step-Down Regulator
U
A
O
PPLICATI
TYPICAL
0.068
μ
F
V
IN
CAP
PDRIVE
LTC1149-5
SHDN1
SHDN2
I
TH
C
T
SGND
PGATE
V
CC
V
CC
SENSE
–
SENSE
+
P, RGNDS
NGATE
1000pF
N-CHANNEL
IRFR024
0.047
μ
F
D1
1N5819
1N4148
1N4148
V
IN
P-CHANNEL
IRFR9024
L*
62
μ
H
R
**
0.05
V
OUT
5V/2A
C
OUT
220
μ
F
C
IN
100
μ
F
100V
3.3
μ
F
0V = NORMAL
>2V = SHUTDOWN
3300
μ
F
C
470pF
1k
1149 F01
*COILTRONICS CTX62-2-MP
**KRL SL-1-C1-0R050J
+
+
+
LOAD CURRENT (A)
0.02
60
E
70
80
100
0.2
2
1149 TA01
90
V
IN
= 12V
V
IN
= 24V
FIGURE 1 CIRCUIT
LTC1149-5 Efficiency
I
Notebook and Palmtop Computers
I
Portable Instruments
I
Battery-Operated Digital Devices
I
Industrial Power Distribution
I
Avionics Systems
I
Telecom Power Supplies
U
S
A
O
PPLICATI
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode
is a trademark of Linear Technology Corporation.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LTC1149-3.3 制造商:LINER 制造商全稱(chēng):Linear Technology 功能描述:High Efficiency Synchronous Step-Down Switching Regulators
LTC1149-5 制造商:LINER 制造商全稱(chēng):Linear Technology 功能描述:High Efficiency Synchronous Step-Down Switching Regulators
LTC1149CN 功能描述:IC REG CTRLR BUCK PWM CM 16-DIP RoHS:否 類(lèi)別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:4,500 系列:PowerWise® PWM 型:控制器 輸出數(shù):1 頻率 - 最大:1MHz 占空比:95% 電源電壓:2.8 V ~ 5.5 V 降壓:是 升壓:無(wú) 回掃:無(wú) 反相:無(wú) 倍增器:無(wú) 除法器:無(wú) Cuk:無(wú) 隔離:無(wú) 工作溫度:-40°C ~ 125°C 封裝/外殼:6-WDFN 裸露焊盤(pán) 包裝:帶卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名稱(chēng):LM1771SSDX
LTC1149CN#PBF 功能描述:IC REG CTRLR BUCK PWM CM 16-DIP RoHS:是 類(lèi)別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:4,500 系列:PowerWise® PWM 型:控制器 輸出數(shù):1 頻率 - 最大:1MHz 占空比:95% 電源電壓:2.8 V ~ 5.5 V 降壓:是 升壓:無(wú) 回掃:無(wú) 反相:無(wú) 倍增器:無(wú) 除法器:無(wú) Cuk:無(wú) 隔離:無(wú) 工作溫度:-40°C ~ 125°C 封裝/外殼:6-WDFN 裸露焊盤(pán) 包裝:帶卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名稱(chēng):LM1771SSDX
LTC1149CN-3.3 功能描述:IC REG CTRLR BUCK PWM CM 16-DIP RoHS:否 類(lèi)別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:2,000 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:1MHz 占空比:50% 電源電壓:9 V ~ 10 V 降壓:無(wú) 升壓:是 回掃:是 反相:無(wú) 倍增器:無(wú) 除法器:無(wú) Cuk:無(wú) 隔離:無(wú) 工作溫度:-40°C ~ 85°C 封裝/外殼:8-TSSOP（0.173"，4.40mm 寬） 包裝:帶卷 (TR)
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