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Linear Technology Electronic Components Datasheet

LTC3440EDD Datasheet

Buck-Boost DC/DC Converter

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LTC3440
Micropower Synchronous
Buck-Boost DC/DC Converter
Features
nn Single Inductor
nn Fixed Frequency Operation with Battery Voltages
Above, Below or Equal to the Output
nn Synchronous Rectification: Up to 96% Efficiency
nn 25µA Quiescent Current in Burst Mode® Operation
nn Up to 600mA Continuous Output Current
nn No Schottky Diodes Required (VOUT < 4.3V)
nn VOUT Disconnected from VIN During Shutdown
nn 2.5V to 5.5V Input and Output Range
nn Programmable Oscillator Frequency
from 300kHz to 2MHz
nn Synchronizable Oscillator
nn Burst Mode Enable Control
nn <1µA Shutdown Current
nn Small Thermally Enhanced 10-Pin MSOP and
(3mm × 3mm) DFN Packages
Applications
nn Palmtop Computers
nn Handheld Instruments
nn MP3 Players
nn Digital Cameras
Description
The LTC®3440 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 topology
incorporated in the IC provides a continuous transfer
function through all operating modes, making the prod-
uct ideal for single lithium-ion, multicell alkaline or NiMH
applications where the output voltage is within the battery
voltage range.
The device includes two 0.19Ω N-channel MOSFET
switches and two 0.22Ω P-channel switches. Switch-
ing frequencies up to 2MHz are programmed with an
external resistor and the oscillator can be synchronized
to an external clock. Quiescent current is only 25µA 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 has either a clock or is driven low, then
fixed frequency switching is enabled.
Other features include a 1µA shutdown, soft-start con-
trol, thermal shutdown and current limit. The LTC3440
is available in the 10-pin thermally enhanced MSOP and
(3mm × 3mm) DFN packages.
L, LT, LTC, LTM, Linear Technology, Burst Mode and the Linear logo are registered trademarks
and ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the
property of their respective owners.
Typical Application
Li-Ion to 3.3V at 600mA Buck-Boost Converter
L1
10µH
3
SW1
4
SW2
VIN = 2.7V TO 4.2V
7
LTC3440
6
VIN
VOUT
R1
340k
+
Li-Ion
8
SHDN/SS
9
FB
C5 1.5nF
2
10
C1 *
MODE/SYNC VC
10µF 1
RT
5
GND
RT
R3
15k R2
200k
60.4k
VOUT
3.3V
600mA
C2
22µF
*1 = Burst Mode OPERATION
0 = FIXED FREQUENCY
C1: TAIYO YUDEN JMK212BJ106MG
C2: TAIYO YUDEN JMK325BJ226MM
L1: SUMIDA CDRH6D38-100
3440 TA01
Efficiency vs V­IN
100
98
VOUT = 3.3V
IOUT = 100mA
96 fOSC = 1MHz
94
92
90
88
86
84
82
80
2.5 3.0 3.5 4.0 4.5
VIN (V)
5.0 5.5
3440 TA02
For more information www.linear.com/LTC3440
3440fd
1


Linear Technology Electronic Components Datasheet

LTC3440EDD Datasheet

Buck-Boost DC/DC Converter

No Preview Available !

LTC3440
Absolute Maximum Ratings (Note 1)
VIN, VOUT Voltage ........................................ – 0.3V to 6V
SW1, SW2 Voltage....................................... –0.3V to 6V
VC, RT, FB, SHDN/SS,
MODE/SYNC Voltage................................... –0.3V to 6V
Operating Temperature Range (Note 2)....–40°C to 85°C
Storage Temperature Range................... –65°C to 125°C
Lead Temperature (Soldering, 10 sec).................... 300°C
Pin Configuration
TOP VIEW
RT 1
MODE/SYNC 2
10 VC
9 FB
SW1 3
11
8 SHDN/SS
SW2 4
GND 5
7 VIN
6 VOUT
DD PACKAGE
10-LEAD (3mm × 3mm) PLASTIC DFN
EXPOSED PAD (PIN 11) IS GND
MUST BE SOLDERED TO PCB
TJMAX = 125°C, θJA = 43°C/W, θJC = 3°C/W
TOP VIEW
RT 1
MODE/SYNC 2
SW1 3
SW2 4
GND 5
10 VC
9 FB
8 SHDN/SS
7 VIN
6 VOUT
MS PACKAGE
10-LEAD PLASTIC MSOP
TJMAX = 125°C,
θJA = 130°C/W 1 layer board
θJA = 100°C/W 4 layer board
θJC = 45°C/W
Order Information http://www.linear.com/product/LTC3440#orderinfo
LEAD FREE FINISH
TAPE AND REEL
PART MARKING
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC3440EDD#PBF
LTC3440EDD#TRPBF LBKT
10-Lead (3mm × 3mm) Plastic DFN
–40°C to 85°C
LTC3440EMS#PBF
LTC3440EMS#TRPBF LTNP
10-Lead Plastic MSOP
–40°C to 85°C
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Consult LTC Marketing for information on nonstandard lead based finish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/. Some packages are available in 500 unit reels through
designated sales channels with #TRMPBF suffix.
Electrical Characteristics The denotes specifications that apply over the full operating temperature
range, otherwise specifications are at TA = 25°C. VIN = VOUT = 3.6V, RT = 60k, unless otherwise noted.
PARAMETER
CONDITIONS
MIN
TYP
MAX UNITS
Input Start-Up Voltage
l
2.4
2.5
V
Input Operating Range
l 2.5
5.5
V
Output Voltage Adjust Range
l 2.5
5.5
V
Feedback Voltage
l 1.196 1.22 1.244
V
Feedback Input Current
Quiescent Current, Burst Mode Operation
Quiescent Current, Shutdown
VFB = 1.22V
VC = 0V, MODE/SYNC = 3V (Note 3)
SHDN = 0V, Not Including Switch Leakage
1
50
nA
25
40
µA
0.1
1
µA
Quiescent Current, Active
VC = 0V, MODE/SYNC = 0V (Note 3)
600
1000
µA
NMOS Switch Leakage
Switches B and C
0.1
5
µA
3440fd
2
For more information www.linear.com/LTC3440


Part Number LTC3440EDD
Description Buck-Boost DC/DC Converter
Maker Linear
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