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Linear Technology Electronic Components Datasheet

LTC3533 Datasheet

2A Wide Input Voltage Synchronous Buck-Boost DC/DC Converter

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FEATURES
Regulated Output with Input Voltages Above,
Below or Equal to the Output
1.8V to 5.5V (Input) and 5.25V (Output)
Voltage Range
0.8A Continuous Output Current: VIN > 1.8V
2A Continuous Output Current: VIN > 3V
Single Inductor
Synchronous Rectification: Up to 96% Efficiency
Programmable Burst Mode® Operation: IQ = 40µA
Output Disconnect in Shutdown
Programmable Frequency from 300kHz to 2MHz
<1µA Shutdown Current
Small Thermally Enhanced 14-Lead (3mm × 4mm ×
0.75mm) DFN package
APPLICATIONS
GSM Modems
Handheld Instruments
Digital Cameras
Smart Phones
Media Players
Miniature Hard Disk Drive Power
LTC3533
2A Wide Input Voltage
Synchronous Buck-Boost
DC/DC Converter
DESCRIPTION
The LTC®3533 is a wide VIN 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 cell lithium-ion/polymer
or multi-cell alkaline/NiMH applications where the output
voltage is within the input voltage range.
The LTC3533 features programmable Burst Mode opera-
tion, extended VIN and VOUT ranges down to 1.8V, and
increased output current. Switching frequencies up to
2MHz are programmed with an external resistor. The Burst
Mode threshold is programmed with a single resistor from
the BURST pin to GND.
Other features include 1µA shutdown current, short
circuit protection, programmable soft-start, current limit
and thermal shutdown. The LTC3533 is housed in the
thermally enhanced 14-lead (3mm × 4mm × 0.75mm)
DFN package.
, LT, LTC, LTM and Burst Mode are registered trademarks of Linear Technology
Corporation. All other trademarks are the property of their respective owners.
TYPICAL APPLICATION
2.2µH
VIN
2.4V TO 4.2V
OFF ON
10µF
SW1 SW2
PVIN
VIN
PVOUT
VOUT
LTC3533
RUN/SS
FB
RT VC
330pF
107k
4.7pF
340k 6.49k
47pF
VOUT
3.3V
1.5A
100µF
33.2k
SGND
BURST
PGND
200k
0.1µF
200k
3533 TA01
Efficiency
100
90
80 Burst Mode
OPERATION
70
60
50 VIN = 2.9V
VIN = 2.2V
40
VIN = 3.9V
30
20
10
0
0.1 1 10 100 1000 10000
OUTPUT CURRENT (mA)
3533 TA01b
3533f
1


Linear Technology Electronic Components Datasheet

LTC3533 Datasheet

2A Wide Input Voltage Synchronous Buck-Boost DC/DC Converter

No Preview Available !

LTC3533 pdf
LTC3533www.DataSheet4U.com
ABSOLUTE MAXIMUM RATINGS
(Note 1)
VIN, PVIN Voltages...........................................–0.3 to 6V
VOUT, PVOUT Voltages......................................–0.3 to 6V
SW1, SW2 Voltages
DC...............................................................–0.3 to 6V
Pulsed < 100ns...........................................–0.3 to 7V
VC, FB, RUN/SS, BURST Voltages..................–0.3 to 6 V
Operating Temperature Range (Note 2) ... –40°C to 85°C
Maximum Junction Temperature (Note 3) ............ 125°C
Storage Temperature Range................... –65°C to 125°C
PACKAGE/ORDER INFORMATION
TOP VIEW
RT
BURST
SGND
SW1
PGND
PGND
SW2
1
2
3
4
5
6
7
14 VC
13 FB
12 RUN/SS
15 11 PVIN
10 VIN
9 PVOUT
8 VOUT
DE PACKAGE
14-LEAD (4mm × 3mm) PLASTIC DFN
TJMAX = 125°C, θJA = 43°C/W, θJC = 4.3°C/W
EXPOSED PAD (PIN 15) IS GND, MUST BE SOLDERED TO PCB
ORDER PART NUMBER DE PART MARKING
LTC3533EDE
3533
Order Options Tape and Reel: Add #TR
Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking: http://www.linear.com/leadfree/
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS The denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 3.6V, VOUT = 3.3V, unless otherwise noted.
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Input Operating Range
1.8
5.5 V
Output Voltage Adjust Range
1.8
5.25 V
Feedback Voltage
1.196 1.22 1.244
V
Feedback Input Current
Quiescent Current – Burst Mode Operation
Quiescent Current – Shutdown
VFB = 1.22V
VC = 0V, VBURST = 0V (Note 4)
VRUN = 0V, Not Including Switch Leakage
1 50
40 50
0.1 1
nA
µA
µA
Quiescent Current – Active
Input Current Limit
VC = 0V, BURST = 3.6V (Note 4)
3.5
700 1100
4.5
µA
A
Peak Current Limit
7A
Reverse Current Limit
0.5 A
NMOS Switch Leakage
Switches B and C
0.1 5
µA
PMOS Switch Leakage
Switches A and D
0.1 10
µA
NMOS Switch On Resistance
Switches B and C
60 mΩ
PMOS Switch On Resistance
Switches A and D
80 mΩ
Maximum Duty Cycle
Boost (% Switch C On)
Buck (% Switch A On)
80
100
90
%
%
Minimum Duty Cycle
0%
3533f
2


Part Number LTC3533
Description 2A Wide Input Voltage Synchronous Buck-Boost DC/DC Converter
Maker Linear Technology
Total Page 16 Pages
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LTC3533 pdf
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