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LTC3403EDD Datasheet

  • LTC3403EDD

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

  • 16頁

  • LINER

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LTC3403
1.5MHz, 600mA
Synchronous Step-Down
Regulator with Bypass Transistor
FEATURES
s
s
DESCRIPTIO
s
s
s
s
s
s
s
s
s
s
s
s
Dynamically Adjustable Output from 0.3V to 3.5V
Very Low Quiescent Current: Only 20
碌
A
During Operation
600mA Output Current
Internal 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
Drives Optional External P-Channel MOSFET
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
3403 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
bypass P-channel MOSFET connects V
OUT
directly to V
IN
,
eliminating power loss through the inductor. Selectable
forced continuous mode enables fast V
OUT
response to the
controlling input.
Supply current is only 20碌A(chǔ) in Burst Mode
廬
operation and
drops to <1碌A(chǔ) in shutdown. The 2.5V to 5V input voltage
range makes the LTC3403 ideally suited for single Li-Ion
battery-powered applications. 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 LTC3403 is available in a low profile 8-lead 3mm
脳
3mm DFN package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode is a registered trademark of Linear Technology Corporation.
APPLICATIO S
s
s
WCDMA Cell Phone Power Amplifiers
Wireless Modems
TYPICAL APPLICATIO
V
IN
2.7V
TO 5V
2.2碌H*
C
IN鈥?/div>
10碌F
CER
V
IN
MODE
RUN
REF
SW
GDR
V
OUT
LTC3403
C
OUT
**
4.7碌F
CER
EFFICIENCY (%)
V
OUT
3脳 V
REF
600mA
OUTPUT
PROGRAMMING
DAC
GND
3
*MURATA LQH32CN2R2M11
**TAIYO YUDEN JMK212BJ475MG
鈥?/div>
TAIYO YUDEN JMK212BJ106MN
WCDMA
RF PA
3403 F01a
Figure 1a. WCDMA Transmitter Power Supply
U
95
90
85
80
75
70
65
60
55
50
0.1
FORCED
CONTINUOUS
MODE
Burst Mode
OPERATION
V
OUT
= 1.8V
1
10
100
OUTPUT CURRENT (mA)
1000
3403 F01b
U
U
V
IN
= 3.6V
V
IN
= 4.2V
V
IN
= 3.6V
V
IN
= 4.2V
Figure 1b. Efficiency vs Output Current
3403f
1

LTC3403EDD 產(chǎn)品屬性

  • LTC3403

  • 121

  • 集成電路 (IC)

  • PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器

  • -

  • 降壓（降壓）

  • 可調(diào)式

  • 1

  • 0.3 V ~ 3.5 V

  • 2.5 V ~ 5 V

  • 電流模式，混合

  • 1.5MHz

  • 600mA

  • 是

  • -40°C ~ 85°C

  • 表面貼裝

  • 8-WFDFN 裸露焊盤

  • 管件

  • 8-DFN-EP（3x3）

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