參數(shù)資料
型號(hào)： LTC1148-3.3
廠商： Linear Technology Corporation
元件分類(lèi)： 基準(zhǔn)電壓源/電流源
英文描述： 500kHz and 1MHz High Efficiency 1.5A Switching Regulators; Package: SO; No of Pins: 8; Temperature Range: -40?°C to 85?°C
中文描述： 射頻放大器
文件頁(yè)數(shù)： 1/20頁(yè)
文件大?。?/td> 319K
代理商： LTC1148-3.3
1
LTC1148
LTC1148-3.3/LTC1148-5
High Efficiency Synchronous
Step-Down Switching Regulators
LOAD CURRENT (A)
0.02
80
E
85
90
100
0.2
2
LTC1148 TA01
95
V
IN
= 6V
V
IN
= 10V
LTC1148-5 Efficiency
S
FEATURE
D
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 R
DS(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 Mode
operation, which
reduces switching losses. Standby power is reduced to only
2mW at V
IN
= 10V (at I
OUT
= 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.
U
ESCRIPTIO
I
Ultrahigh Efficiency: Over 95% Possible
I
Current-Mode Operation for Excellent Line and Load
Transient Response
I
High Efficiency Maintained Over Three Decades of
Output Current
I
Low 160
μ
A Standby Current at Light Loads
I
Logic Controlled Micropower Shutdown: I
Q
< 20
μ
A
I
Wide V
IN
Range: 3.5V* to 20V
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
Output Can Be Externally Held High in Shutdown
I
Available in 14-Pin Narrow SO Package
Figure 1. High Efficiency Step-Down Converter
U
A
O
PPLICATI
TYPICAL
, 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.
U
S
A
O
PPLICATI
I
Notebook and Palmtop Computers
I
Portable Instruments
I
Battery-Operated Digital Devices
I
Cellular Telephones
I
DC Power Distribution Systems
I
GPS Systems
0V = NORMAL
>1.5V = SHUTDOWN
P-CHANNEL
Si4431DY
+
1
μ
F
L*
62
μ
H
R
**
0.05
V
5V/2A
+
C
IN
100
μ
F
V
IN
(5.2V TO 18V)
I
TH
C
T
SGND
C
470pF
C
3300pF
R
C
1k
+
C
OUT
390
μ
F
D1
MBRS140T3
LT1148 TA01
N-DRIVE
PGND
N-CHANNEL
Si4412DY
V
IN
P-DRIVE
LTC1148HV-5
SHUTDOWN
SENSE
+
SENSE
–
1000pF
COILTRONICS CTX62-2-MP
KRL SL-1-C1-0R050J
**
*
相關(guān)PDF資料
PDF描述
LTC1148-5 RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS
LTC1148CN-3.3 CB 3C 3#16S SKT RECP WALL
LTC1148CN-5 ER 3C 3#16S SKT RECP WALL
LTC1148CS-3.3 RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LTC1148-5 制造商:LINER 制造商全稱(chēng):Linear Technology 功能描述:High Efficiency Synchronous Step-Down Switching Regulators
LTC1148CN 功能描述:IC REG CTRLR BUCK PWM CM 14-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
LTC1148CN#PBF 功能描述:IC REG CTRLR BUCK PWM CM 14-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
LTC1148CN-3.3 功能描述:IC REG CTRLR BUCK PWM CM 14-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:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:96% 電源電壓:4 V ~ 36 V 降壓:無(wú) 升壓:是 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:24-WQFN 裸露焊盤(pán) 包裝:帶卷 (TR)
LTC1148CN-3.3#PBF 功能描述:IC REG CTRLR BUCK PWM CM 14-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:4,000 系列:- PWM 型:電壓模式 輸出數(shù):1 頻率 - 最大:1.5MHz 占空比:66.7% 電源電壓:4.75 V ~ 5.25 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 ~ 85°C 封裝/外殼:40-VFQFN 裸露焊盤(pán) 包裝:帶卷 (TR)
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