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LTC3441EDE#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
LTC3441
1
3441fc
For more information www.linear.com/LTC3441
Typical applicaTion
FeaTures
applicaTions
DescripTion
High Current Micropower
Synchronous Buck-Boost
DC/DC Converter
The LTC
®
3441 is a high efficiency, fixed frequency, buck-
boost DC/DC converter that operates efficiently 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 or multicell ap
-
plications where the output 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 mod
-
erate efficiency improvement. The operating frequency
is
internally
set to 1MHz and can be synchronized up to
1.7MHz. Quiescent current is only 25µA in Burst Mode
operation, maximizing battery life in portable applica
-
tions. 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
frequency switching is enabled.
Other features include a 1µA
shutdown, soft-start control,
thermal shutdown and current limit. The LTC3441 is
available in a thermally enhanced 12-lead (4mm × 3mm)
DFN package.
Li-Ion to 3.3V at 1A Buck-Boost Converter
n
Regulated Output with Input Above, Below or Equal
to the Output
n
Single Inductor, No Schottky Diodes
n
High Efficiency: Up to 95%
n
25µA Quiescent Current in Burst Mode
®
Operation
n
Up to 1.2A Continuous Output Current from a Single
Lithium-Ion
n
True Output Disconnect in Shutdown
n
2.4V to 5.5V Input Range
n
2.4V to 5.25V Output Range
n
1MHz Fixed Frequency Operation
n
Synchronizable Oscillator
n
Selectable Burst Mode or Fixed Frequency Operation
n
<1µA Quiescent Current in Shutdown
n
Small, Thermally Enhanced 12-Lead (4mm × 3mm)
DFN package
n
Handheld Computers
n
Handheld Instruments
n
MP3 Players
n
Digital Cameras
Efficiency vs V
IN
SW1
PV
IN
V
IN
SHDN/SS
MODE/SYNC
PGND
5
8
12
11
2
6
4
9
10
1
7
3
SW2
V
OUT
FB
V
C
GND
PGND
LTC3441
C
IN
10µF
*1 = Burst Mode OPERATION
0 = FIXED FREQUENCY
C
IN
: TAIYO YUDEN JMK212BJ106MG
C
OUT
: TAIYO YUDEN JMK325BJ226MM
L1: TOKO A916CY-4R7M
2.5V TO 4.2V
Li-Ion
*
15k
340k
C
OUT
22µF
V
OUT
3.3V
1A
200k
1.5nF
3441 TA01
L1
4.7µH
V
IN
(V)
2.5
50
EFFICIENCY (%)
60
70
80
3
3.5
4 4.5
3441 TA02
5
90
100
55
65
75
85
95
5.5
I
OUT
= 200mA
I
OUT
= 1A
V
OUT
= 3.3V
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.
LTC3441
2
3441fc
For more information www.linear.com/LTC3441
pin conFiguraTionabsoluTe MaxiMuM raTings
V
IN
, V
OUT
Voltage ....................................... –0.3V to 6V
SW1, SW2 Voltage
DC ............................................................ –0.3V to 6V
Pulsed < 100ns ....................................... –0.3V to 7V
SHDN/SS, MODE/SYNC Voltage ................ –0.3V to 6V
Operating Temperature Range (Note 2) .. –40°C to 85°C
Maximum Junction Temperature (Note 4)............. 125°C
Storage Temperature Range .................. –65°C to 125°C
(Note 1)
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= V
OUT
= 3.6V,unless otherwise noted.
elecTrical characTerisTics
PARAMETER CONDITIONS MIN TYP MAX UNITS
Input Start-Up Voltage
●
2.3 2.4 V
Output Voltage Adjust Range
●
2.4 5.25 V
Feedback Voltage
●
1.19 1.22 1.25 V
Feedback Input Current V
FB
= 1.22V 1 50 nA
Quiescent Current—Burst Mode Operation V
C
= 0V, MODE/SYNC = 3V (Note 3) 25 40 µA
Quiescent Current—SHDN V
OUT
= SHDN = 0V, Not Including Switch Leakage 0.1 1 µA
Quiescent Current—Active MODE/SYNC = 0V (Note 3) 520 900 µA
NMOS Switch Leakage Switches B and C 0.1 7 µA
PMOS Switch Leakage Switches A and D 0.1 10 µA
NMOS Switch On Resistance Switches B and C 0.10 Ω
PMOS Switch On Resistance Switches A and D 0.11 Ω
Input Current Limit
●
2 3.2 A
Max Duty Cycle Boost (% Switch C On)
Buck (% Switch A In)
●
●
70
100
88 %
%
Min Duty Cycle
●
0 %
Frequency Accuracy
●
0.85 1 1.15 MHz
MODE/SYNC Threshold
●
0.4 1.4 V
12
11
10
9
8
7
1
2
3
4
5
6
FB
V
C
V
IN
PV
IN
V
OUT
MODE/SYNC
SHDN/SS
GND
PGND
SW1
SW2
PGND
TOP VIEW
13
DE12 PACKAGE
12-LEAD (4mm × 3mm) PLASTIC DFN
T
JMAX
= 125°C
θ
JA
= 53°C/W 1-LAYER BOARD, θ
JA
= 43°C/W 4-LAYER BOARD
θ
JC
= 4.3°C/W, EXPOSED PAD IS PGND (PIN 13)
MUST BE SOLDERED TO PCB
orDer inForMaTion
LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC3441EDE#PBF LTC3441EDE#TRPBF 3441 12-Lead (4mm × 3mm) Plastic DFN –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.
http://www.linear.com/product/LTC3441#orderinfo
LTC3441
3
3441fc
For more information www.linear.com/LTC3441
elecTrical characTerisTics
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2
:
The LTC3441E is guaranteed to meet performance specifications
from 0°C to 70°C. Specifications over the –40°C to 85°C operating
temperature range are assured by design, characterization and correlation
with statistical process controls.
Note 3:
Current measurements are preformed when the outputs are not
switching.
Note 4: This IC includes overtemperature protection that is intended
to protect the device during momentary overload conditions. Junction
temperature will exceed 125°C when overtemperature protection is active.
Continuous operation above the specified maximum operating junction
temperature may result in device degradation or failure.
Typical perForMance characTerisTics
Efficiency V
OUT
Ripple at 1A Load
Load Transient Response,
100mA to 1A
Switch Pins in Buck-Boost Mode
Switch Pins Entering
Buck-Boost Mode
I
OUT
(mA)
30
EFFICIENCY (%)
90
100
20
10
80
50
70
60
40
0.1 10 100 1000
3441 G17
0
1
Burst Mode
OPERATION
V
IN
= 2.7V
V
IN
= 4.2V
V
IN
= 3.6V
V
OUT
= 3.3V
L = 4.7µH
C
OUT
= 47µF
I
OUT
= 1A
V
OUT
= 3.3V
V
OUT
10mV/DIV
AC-COUPLED
BUCK
V
IN
= 4.2V
BUCK-BOOST
V
IN
= 3.3V
BOOST
V
IN
= 2.7V
3441 G02
1µs/DIV
1A
100mA
V
OUT
100mV/DIV
3441 G01
100µs/DIV
V
IN
= 3.3V
V
OUT
= 3.3V
I
OUT
= 500mA
SW1
2V/DIV
SW2
2V/DIV
3441 G03
50ns/DIV
V
IN
= 4.2V
V
OUT
= 3.3V
I
OUT
= 500mA
SW1
2V/DIV
SW2
2V/DIV
3441 G04
50ns/DIV
PARAMETER CONDITIONS MIN TYP MAX UNITS
MODE/SYNC Input Current V
MODE/SYNC
= 5.5V 0.01 1 µA
Error Amp AV
OL
90 dB
Error Amp Source Current 14 µA
Error Amp Sink Current 300 µA
SHDN/SS Threshold When IC is Enabled
●
0.4 1 1.4 V
SHDN/SS Threshold When EA is at Max Boost Duty Cycle 2 2.4 V
SHDN/SS Input Current V
SHDN
= 5.5V 0.01 1 µA
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= V
OUT
= 3.6V,unless otherwise noted.
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16

LTC3441EDE#PBF

Mfr. #:
Buy LTC3441EDE#PBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators Hi C uP Sync Buck-Boost DC/DC Conv
Lifecycle:
New from this manufacturer.
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