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LTC3530EDD-PBF

Description
Wide Input Voltage Synchronous Buck-Boost DC/DC Converter
File Size296KB,16 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
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LTC3530EDD-PBF Overview

Wide Input Voltage Synchronous Buck-Boost DC/DC Converter

FEATURES
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LTC3530
Wide Input Voltage
Synchronous Buck-Boost
DC/DC Converter
DESCRIPTION
The LTC
®
3530 is a wide V
IN
range, highly efficient, fixed
frequency, buck-boost DC/DC converter that operates
from input voltages above, below or equal to the output
voltage. The topology incorporated in the IC provides a
continuous transfer function through all operating modes,
making the product ideal for single lithium-ion, two-cell
alkaline or NiMH applications where the output voltage is
within the battery voltage range.
The LTC3530 is pin compatible with the LTC3440 buck-
boost DC/DC converter but adds programmable automatic
Burst Mode operation and extends the V
IN
/V
OUT
range to
1.8V. Switching frequencies up to 2MHz are programmed
with an external resistor. Automatic Burst Mode operation
allows the user to program the load current threshold for
Burst Mode operation using a single resistor from the
BURST pin to GND.
Other features include 1μA shutdown, short circuit pro-
tection, programmable soft-start control, current limit
and thermal shutdown. The LTC3530 is available in a
thermally enhanced 10-lead (3mm × 3mm) DFN or MSOP
package.
L,
LT, LTC, LTM and Burst Mode are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners. Patents Pending.
Regulated Output with Input Voltages Above, Below
or Equal to the Output
1.8V to 5.5V Input and 1.8V to 5.25V Output Range
250mA Continuous Output Current from 1.8V V
IN
600mA Continuous/1A Peak Output Current from
Li-Ion
Single Inductor
Synchronous Rectification: Up to 96% Efficiency
Programmable Automatic Burst Mode
®
Operation
Output Disconnect in Shutdown
Pin Compatible with the LTC3440
Programmable Frequency from 300kHz to 2MHz
<1μA Shutdown Current
Small Thermally Enhanced 10-Lead (3mm × 3mm)
DFN and 10-Lead MS Packages
APPLICATIONS
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MP3 Players
Handheld Instruments
Digital Cameras
Smart Phones
Portable GPS Units
Miniature Hard Disk Drive Power
TYPICAL APPLICATION
4.7μH
100
90
SW1
SW2
V
OUT
1.8V TO 5.5V
V
IN
LTC3530
SHDN/SS
FB
V
C
BURST
GND
100k
3530 TA01a
Efficiency
Burst Mode V
IN
= 3.6V
V
IN
= 4.2V
33pF
1M
15k
EFFICIENCY (%)
V
OUT
3.3V AT
250mA
80
70
60
50
40
30
V
IN
= 2.0V
V
IN
= 3.6V
OFF ON
22μF
10k
576k
560pF
10μF
33.2k
R
T
20
10
0.01μF
0
0.1
1
10
100
LOAD CURRENT (mA)
1000
3350 TA01b
3530fb
1

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