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LTC3443EDE#TR

Description
Switching Regulator LTC3443 - High Current Micropower 600kHz Synchronous Buck-Boost DC/DC Converter
CategoryPower/power management    The power supply circuit   
File Size215KB,16 Pages
ManufacturerADI
Websitehttps://www.analog.com
Download Datasheet Parametric View All

LTC3443EDE#TR Overview

Switching Regulator LTC3443 - High Current Micropower 600kHz Synchronous Buck-Boost DC/DC Converter

LTC3443EDE#TR Parametric

Parameter NameAttribute value
Is it Rohs certified?incompatible
MakerADI
package instructionVSON,
Reach Compliance Codenot_compliant
ECCN codeEAR99
Analog Integrated Circuits - Other TypesSWITCHING REGULATOR
control modeVOLTAGE-MODE
Control TechnologyPULSE WIDTH MODULATION
Maximum input voltage5.5 V
Minimum input voltage2.4 V
Nominal input voltage3.6 V
JESD-30 codeR-PDSO-N12
JESD-609 codee0
length4 mm
Humidity sensitivity level1
Number of functions1
Number of terminals12
Maximum operating temperature70 °C
Minimum operating temperature
Package body materialPLASTIC/EPOXY
encapsulated codeVSON
Package shapeRECTANGULAR
Package formSMALL OUTLINE, VERY THIN PROFILE
Peak Reflow Temperature (Celsius)235
Certification statusNot Qualified
Maximum seat height0.85 mm
surface mountYES
Switch configurationBOOST
Temperature levelCOMMERCIAL
Terminal surfaceTin/Lead (Sn/Pb)
Terminal formNO LEAD
Terminal pitch0.5 mm
Terminal locationDUAL
Maximum time at peak reflow temperature20
width3 mm
LTC3443
High Current Micropower
600kHz Synchronous Buck-Boost
DC/DC Converter
FEATURES
DESCRIPTIO
Regulated Output with Input Above, Below or Equal
to the Output
Single Inductor, No Schottky Diodes
High Efficiency: Up to 96%
28μA Quiescent Current in Burst Mode
®
Operation
Up to 1.2A Continuous Output Current from a Single
Lithium-Ion
True Output Disconnect in Shutdown
2.4V to 5.5V Input Range
2.4V to 5.25V Output Range
600kHz Fixed Frequency Operation
Synchronizable Oscillator
Selectable Burst Mode or Fixed Frequency Operation
<1μA Quiescent Current in Shutdown
Small, Thermally Enhanced 12-Lead
(4mm
×
3mm
×
0.8mm) DFN package
The LTC
®
3443 is a high efficiency, fixed frequency, buck-
boost DC/DC converter that operates from input voltages
above, below or equal to the output voltage. The part is pin
for pin compatible with its predecessor, the LTC3441, with
a lower operating frequency (600kHz), and a V
C
pin clamp
circuit during Burst Mode operation. The topology incor-
porated in the IC provides a continuous transfer function
through all operating modes, making the product ideal for
single Lithium Ion or multicell applications where the out-
put voltage is within the battery voltage range.
The device includes two 0.10Ω N-channel MOSFET
switches and two 0.11Ω P-channel switches. External
Schottky diodes are optional, and can be used for a
moderate efficiency improvement. The operating frequency
is internally set to 600kHz and can be synchronized up to
1.2MHz. Quiescent current is only 28μA in Burst Mode
operation, maximizing battery life in portable applications.
Burst Mode operation is user controlled and can be
enabled by driving the MODE/SYNC pin high. If the MODE/
SYNC pin is driven low or with a clock, then fixed fre-
quency switching is enabled.
Other features include a 1μA shutdown, soft-start control,
thermal shutdown and current limit. The LTC3443 is
available in a thermally enhanced 12-lead (4mm
×
3mm)
DFN Package.
APPLICATIO S
Handheld Computers
Handheld Instruments
MP3 Players
Digital Cameras
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
Burst Mode is a registered trademark of Linear Technology Corporation.
U.S. Patent #’s 6404251, 6166527
TYPICAL APPLICATIO
6μH
Li-Ion to 3.3V at 1A Buck-Boost Converter
220pF
SW1
V
IN
2.5V
TO 4.2V
Li-Ion
10μF
PV
IN
SW2
340k
EFFICIENCY (%)
V
OUT
3.3V
1A
100
95
90
85
80
75
70
65
60
55
V
OUT
LTC3443
V
IN
FB
SHDN/SS
V
C
2.2k
15k
560pF
200k
44μF
(2
×
22μF)
MODE/SYNC GND
PGND
PGND
3443 TA01
50
2.7
U
Efficiency vs V
IN
I
OUT
= 200mA
I
OUT
= 1A
V
OUT
= 3.3V
3.2
3.7
4.2
V
IN
(V)
4.7
5.2
3443 TA02
U
U
3443fa
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