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| 型号： | LTC3408EDD#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 1/12页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK W/BYPASS TXRX 8-DFN |
| 标准包装： | 121 |
| 应用： | 转换器，WCDMA 功率放大器应用 |
| 输入电压： | 2.5 V ~ 5 V |
| 输出数： | 1 |
| 输出电压： | 0.3 V ~ 3.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-WFDFN 裸露焊盘 |
| 供应商设备封装： | 8-DFN-EP（3x3） |
| 包装： | 管件 |
LTC3408
1.5MHz, 600mA
Synchronous Step-Down
Regulator with Bypass Transistor
FEATURES
DESCRIPTIO
■
■
■
■
■
■
■
■
■
■
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■
Dynamically Adjustable Output from 0.3V to 3.5V
600mA Output Current
Internal 0.08 ? P-Channel MOSFET Bypass
Transistor
High Efficiency: Up to 96%
1.5MHz Constant Frequency Operation
No Schottky Diode Required
Low Dropout Operation: 100% Duty Cycle
2.5V to 5V Input Voltage Range
Shutdown Mode Draws < 1 μ A Supply Current
Current Mode Operation for Excellent Line and
Load Transient Response
Overtemperature Protected
Available in 8-Lead 3mm × 3mm DFN Package
The LTC ? 3408 is a high efficiency monolithic synchro-
nous buck regulator optimized for WCDMA power ampli-
fier applications. The output voltage can be dynamically
programmed from 0.3V to 3.5V. At V OUT > 3.6V an internal
0.08 ? bypass P-channel MOSFET connects V OUT directly
to V IN , eliminating power loss through the inductor.
The input voltage range is 2.5V to 5V making the LTC3408
ideally suited for single Li-Ion battery-powered applica-
tions. 100% duty cycle provides low dropout operation,
extending battery life in portable systems.
Switching frequency is internally set at 1.5MHz, allowing
the use of small surface mount inductors and capacitors.
The internal synchronous switch increases efficiency and
eliminates the need for an external Schottky diode.
APPLICATIO S
■ WCDMA Cell Phone Power Amplifiers
The LTC3408 is available in a low profile (0.75mm) 8-lead
3mm × 3mm DFN package.
■
Wireless Modems
, LTC and LT are registered trademarks of Linear Technology Corporation.
U.S. Patent Numbers: 5481178, 6580258, 6304066, 6127815, 6498466, 6611131
TYPICAL APPLICATIO
WCDMA Transmitter Power Supply
Efficiency Power Lost vs Load Current
1
100
V IN
2.7V
TO 5V
C IN?
10 μ F
CER
V IN SW
LTC3408
RUN V OUT
4.7 μ H*
V OUT
3 × V REF
C OUT ** 600mA
4.7 μ F
CER
0.1
90
80
70
60
REF
50
TAIYO YUDEN JMK212BJ106MN
OUTPUT
PROGRAMMING
DAC
GND
* MURATA LQH32CN4R7M11
** TAIYO YUDEN JMK212BJ475MG
?
WCDMA
RF PA
3403 TA01
0.01
0.01
V OUT = 1.2V
V OUT = 1.5V
V OUT = 1.8V
V OUT = 2.5V
40
30
20
10
0
1
10 100
1000
LOAD CURRENT (mA)
3408 F04
3408f
1
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| LTC3409AEDD#PBF | 功能描述:IC REG BUCK SYNC ADJ 0.6A 8DFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:升压（升压） 输出类型:可调式 输出数:1 输出电压:1.24 V ~ 30 V 输入电压:1.5 V ~ 12 V PWM 型:电流模式，混合 频率 - 开关:600kHz 电流 - 输出:500mA 同步整流器:无 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 包装:带卷 (TR) 供应商设备封装:8-SOIC |
| LTC3409AEDD#TRPBF | 功能描述:IC REG BUCK SYNC ADJ 0.6A 8DFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:升压（升压） 输出类型:可调式 输出数:1 输出电压:1.24 V ~ 30 V 输入电压:1.5 V ~ 12 V PWM 型:电流模式，混合 频率 - 开关:600kHz 电流 - 输出:500mA 同步整流器:无 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 包装:带卷 (TR) 供应商设备封装:8-SOIC |
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