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LTC3408EDD

Description
Switching Voltage Regulators LTC3408 - 1.5MHz, 600mA Synchronous Step-Down Regulator with Bypass Transistor
CategoryPower/power management    The power supply circuit   
File Size154KB,12 Pages
ManufacturerADI
Websitehttps://www.analog.com
Download Datasheet Parametric Compare View All

LTC3408EDD Overview

Switching Voltage Regulators LTC3408 - 1.5MHz, 600mA Synchronous Step-Down Regulator with Bypass Transistor

LTC3408EDD Parametric

Parameter NameAttribute value
Is it Rohs certified?incompatible
MakerADI
package instructionHVSON,
Reach Compliance Codenot_compliant
ECCN codeEAR99
Analog Integrated Circuits - Other TypesSWITCHING REGULATOR
control modeCURRENT-MODE
Maximum input voltage5 V
Minimum input voltage2.5 V
Nominal input voltage3.6 V
JESD-30 codeS-PDSO-N8
JESD-609 codee0
length3 mm
Humidity sensitivity level1
Number of functions1
Number of terminals8
Maximum operating temperature70 °C
Minimum operating temperature
Maximum output current1.3 A
Package body materialPLASTIC/EPOXY
encapsulated codeHVSON
Package shapeSQUARE
Package formSMALL OUTLINE, HEAT SINK/SLUG, VERY THIN PROFILE
Peak Reflow Temperature (Celsius)235
Certification statusNot Qualified
Maximum seat height0.8 mm
surface mountYES
Switch configurationBUCK
Maximum switching frequency1800 kHz
Temperature levelCOMMERCIAL
Terminal surfaceTin/Lead (Sn/Pb)
Terminal formNO LEAD
Terminal pitch0.5 mm
Terminal locationDUAL
Maximum time at peak reflow temperature20
width3 mm
LTC3408
1.5MHz, 600mA
Synchronous Step-Down
Regulator with Bypass Transistor
FEATURES
DESCRIPTIO
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 < 1µA 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
0.08Ω 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
×
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
WCDMA Cell Phone Power Amplifiers
Wireless Modems
TYPICAL APPLICATIO
WCDMA Transmitter Power Supply
V
IN
2.7V
TO 5V
4.7µH*
C
IN†
10µF
CER
V
IN
SW
V
OUT
3× V
REF
C
OUT
** 600mA
4.7µF
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
TAIYO YUDEN JMK212BJ106MN
3403 TA01
0.01
U
70
60
50
40
30
20
10
0
1000
U
U
EFFICIENCY (%)
3408 F04
3408f
1

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Description Switching Voltage Regulators LTC3408 - 1.5MHz, 600mA Synchronous Step-Down Regulator with Bypass Transistor Switching Voltage Regulators LTC3408 - 1.5MHz, 600mA Synchronous Step-Down Regulator with Bypass Transistor
Is it Rohs certified? incompatible incompatible
Maker ADI ADI
package instruction HVSON, HVSON,
Reach Compliance Code not_compliant not_compliant
ECCN code EAR99 EAR99
Analog Integrated Circuits - Other Types SWITCHING REGULATOR SWITCHING REGULATOR
control mode CURRENT-MODE CURRENT-MODE
Maximum input voltage 5 V 5 V
Minimum input voltage 2.5 V 2.5 V
Nominal input voltage 3.6 V 3.6 V
JESD-30 code S-PDSO-N8 S-PDSO-N8
JESD-609 code e0 e0
length 3 mm 3 mm
Humidity sensitivity level 1 1
Number of functions 1 1
Number of terminals 8 8
Maximum operating temperature 70 °C 70 °C
Maximum output current 1.3 A 1.3 A
Package body material PLASTIC/EPOXY PLASTIC/EPOXY
encapsulated code HVSON HVSON
Package shape SQUARE SQUARE
Package form SMALL OUTLINE, HEAT SINK/SLUG, VERY THIN PROFILE SMALL OUTLINE, HEAT SINK/SLUG, VERY THIN PROFILE
Peak Reflow Temperature (Celsius) 235 235
Certification status Not Qualified Not Qualified
Maximum seat height 0.8 mm 0.8 mm
surface mount YES YES
Switch configuration BUCK BUCK
Maximum switching frequency 1800 kHz 1800 kHz
Temperature level COMMERCIAL COMMERCIAL
Terminal surface Tin/Lead (Sn/Pb) Tin/Lead (Sn/Pb)
Terminal form NO LEAD NO LEAD
Terminal pitch 0.5 mm 0.5 mm
Terminal location DUAL DUAL
Maximum time at peak reflow temperature 20 20
width 3 mm 3 mm
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