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LTC3408EDD Datasheet

  • LTC3408EDD

  • 1.5MHz, 600mA Synchronous Step-Down Regulator with Bypass Tr...

  • 157.14KB

  • 12頁

  • LINER

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LTC3408
1.5MHz, 600mA
Synchronous Step-Down
Regulator with Bypass Transistor
FEATURES
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DESCRIPTIO
Dynamically Adjustable Output from 0.3V to 3.5V
600mA Output Current
Internal 0.08
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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碌A(chǔ) Supply Current
Current Mode Operation for Excellent Line and
Load Transient Response
Overtemperature Protected
Available in 8-Lead 3mm
脳
3mm DFN Package
The LTC
廬
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鈩?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.
The LTC3408 is available in a low profile (0.75mm) 8-lead
3mm
脳
3mm DFN package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
U.S. Patent Numbers: 5481178, 6580258, 6304066, 6127815, 6498466, 6611131
APPLICATIO S
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WCDMA Cell Phone Power Amplifiers
Wireless Modems
TYPICAL APPLICATIO
WCDMA Transmitter Power Supply
V
IN
2.7V
TO 5V
4.7碌H*
C
IN鈥?/div>
10碌F
CER
V
IN
SW
V
OUT
3脳 V
REF
C
OUT
** 600mA
4.7碌F
CER
Efficiency Power Lost vs Load Current
1
100
90
80
POWER LOST (W)
LTC3408
RUN
REF
V
OUT
0.1
OUTPUT
PROGRAMMING
DAC
GND
WCDMA
RF PA
0.01
V
OUT
= 1.2V
V
OUT
= 1.5V
V
OUT
= 1.8V
V
OUT
= 2.5V
1
10
100
LOAD CURRENT (mA)
*MURATA LQH32CN4R7M11
**TAIYO YUDEN JMK212BJ475MG
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TAIYO YUDEN JMK212BJ106MN
3403 TA01
0.01
U
70
60
50
40
30
20
10
0
1000
U
U
EFFICIENCY (%)
3408 F04
3408f
1

LTC3408EDD 產(chǎn)品屬性

  • LTC3408

  • 121

  • 集成電路 (IC)

  • PMIC - 穩(wěn)壓器 - 專用型

  • -

  • 轉(zhuǎn)換器，WCDMA 功率放大器應(yīng)用

  • 2.5 V ~ 5 V

  • 1

  • 0.3 V ~ 3.5 V

  • -40°C ~ 85°C

  • 表面貼裝

  • 8-WFDFN 裸露焊盤

  • 8-DFN-EP（3x3）

  • 管件

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