range synchronous monolithic buck-boost DC/DC con-
verter with programmable average output current. The
LTC3114-1’s proprietary buck-boost PWM control cir-
cuitry delivers low noise operation across the entire
operating voltage range. Current mode control ensures
exceptional line and load transient responses.
Synchronous, internal MOSFET switches and pin select-
able Burst Mode operation maintain high efficiency across
the entire range of load current. Average output current
is programmed with a standard resistor and provides
the basis for wide input range, high efficiency charging
systems or constant current, high efficiency LED drive.
Regulator turn-on is programmable through the accu-
rate RUN pin. Quiescent current is just 3µA in shutdown.
Overtemperature protection, short-circuit protection and
soft-start are integrated. The LTC3114-1 is offered in
16-lead 3mm × 5mm × 0.75mm DFN and 16 lead TSSOP
(FE) packages.
All registered trademarks and trademarks are the property of their respective owners. Protected
by U.S. patents, including 6404251, 6166527.
n
Regulates V
OUT
Above, Below or Equal to V
IN
Single Inductor
Wide V
IN
Range: 2.2V to 40V
Wide V
OUT
Range: 2.7V to 40V
1A Output Current in Buck Mode
0.5A Output Current, V
IN
= 3.6V, V
OUT
= 5V
Programmable Average Output Current
Up to 96% Efficiency
Burst Mode
®
Operation, 30µA No-Load I
Q
Current Mode Control
1.2MHz Ultralow Noise PWM
Accurate RUN Pin Threshold
Thermally Enhanced, 16-lead 3mm × 5mm DFN and
TSSOP Packages
AEC-Q100 Qualified for Automotive Applications
APPLICATIONS
n
n
n
n
n
24V/28V Industrial Power Supply
12V Lead-Acid to 12V Regulator
High Power LED Driver
12V/24V Solar Panel Battery Charging Systems
Automotive Power Systems
TYPICAL APPLICATION
Efficiency vs Input Voltage
6.8µH
68nF
SW1
SW2
BST2
BST1
LTC3114-1
V
IN
PV
OUT
PV
IN
RUN
PROG
MODE
GND
LDO
PLDO
FB
VC
PGND
68nF
V
OUT
5V
1A
30µF V > 5V
IN
95
90
EFFICIENCY (%)
85
V
IN
2.7V TO 40V
10µF
4.7µF
2M
80
4700pF
27.4k
33nF
20k
499k
31141 TA01a
75
I
LOAD
= 300mA
I
LOAD
= 600mA
1
10
INPUT VOLTAGE (V)
40
31141 TA01b
70
Rev. D
Document Feedback
For more information
www.analog.com
1
LTC3114-1
ABSOLUTE MAXIMUM RATINGS
(Note 1)
V
IN
, PV
IN
, PV
OUT
........................................ –0.3V to 45V
V
BST1
.....................................V
SW1
– 0.3V to V
SW1
+ 6V
V
BST2
.....................................V
SW2
– 0.3V to V
SW2
+ 6V
V
RUN
............................................. –0.3V to (V
IN
+ 0.3V)
Voltage, All Other Pins ................................. –0.3V to 6V
Operating Junction Temperature Range (Notes 2, 4)
LTC3114E-1/LTC3114I-1 ..................... –40°C to 125°C
LTC3114H-1 ....................................... –40°C to 150°C
LTC3114MP-1..................................... –55°C to 150°C
Storage Temperature Range....................–65°C to 150°C
Lead Temperature (Soldering, 10 Sec)
FE Package ....................................................... 300°C
PIN CONFIGURATION
TOP VIEW
PGND
SW2
PV
OUT
RUN
PROG
VC
FB
GND
1
2
3
4
5
6
7
8
17
PGND
16 MODE
15 SW1
14 PV
IN
13 BST1
12 BST2
11 PLDO
10 V
IN
9
LDO
PGND
SW2
PV
OUT
RUN
PROG
VC
FB
GND
1
2
3
4
5
6
7
8
17
PGND
TOP VIEW
16 MODE
15 SW1
14 PV
IN
13 BST1
12 BST2
11 PLDO
10 V
IN
9
LDO
DHC PACKAGE
16-LEAD (5mm
×
3mm) PLASTIC DFN
T
JMAX
= 150°C,
θ
JA
= 43°C/W (4-LAYER BOARD),
θ
JC
= 4°C/W
EXPOSED PAD (PIN 17) IS PGND, MUST BE SOLDERED TO PCB
FOR RATED THERMAL PERFORMANCE
FE PACKAGE
16-LEAD PLASTIC TSSOP
T
JMAX
= 150°C,
θ
JA
= 38°C/W
EXPOSED PAD (PIN 17) IS PGND, MUST BE SOLDERED TO PCB
FOR RATED THERMAL PERFORMANCE
ORDER INFORMATION
LEAD FREE FINISH
LTC3114EDHC-1#PBF
LTC3114IDHC-1#PBF
LTC3114HDHC-1#PBF
LTC3114MPDHC-1#PBF
LTC3114EFE-1#PBF
LTC3114IFE-1#PBF
LTC3114HFE-1#PBF
LTC3114MPFE-1#PBF
TAPE AND REEL
LTC3114EDHC-1#TRPBF
LTC3114IDHC-1#TRPBF
LTC3114HDHC-1#TRPBF
LTC3114EFE-1#TRPBF
LTC3114IFE-1#TRPBF
LTC3114HFE-1#TRPBF
LTC3114MPFE-1#TRPBF
PART MARKING*
31141
31141
31141
3114FE-1
3114FE-1
3114FE-1
3114FE-1
PACKAGE DESCRIPTION
16-Lead (5mm × 3mm) Plastic DFN
16-Lead (5mm × 3mm) Plastic DFN
16-Lead (5mm × 3mm) Plastic DFN
16-Lead (5mm × 3mm) Plastic DFN
16-Lead Plastic TSSOP
16-Lead Plastic TSSOP
16-Lead Plastic TSSOP
16-Lead Plastic TSSOP
TEMPERATURE RANGE
–40°C to 125°C
–40°C to 125°C
–40°C to 150°C
–55°C to 150°C
–40°C to 125°C
–40°C to 125°C
–40°C to 150°C
–55°C to 150°C
LTC3114MPDHC-1#TRPBF 31141
2
Rev. D
For more information
www.analog.com
LTC3114-1
ORDER INFORMATION
LEAD FREE FINISH
LTC3114EDHC-1#WPBF
LTC3114IDHC-1#WPBF
LTC3114IFE-1#WPBF
LTC3114EFE-1#WPBF
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
16-Lead (5mm × 3mm) Plastic DFN
16-Lead (5mm × 3mm) Plastic DFN
16-Lead Plastic TSSOP
16-Lead Plastic TSSOP
TEMPERATURE RANGE
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
AUTOMOTIVE PRODUCTS**
LTC3114EDHC-1#WTRPBF 31141
LTC3114IDHC-1#WTRPBF
LTC3114IFE-1#WTRPBF
LTC3114EFE-1#WTRPBF
31141
3114FE-1
3114FE-1
Contact the factory for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Tape and reel specifications.
Some packages are available in 500 unit reels through designated sales channels with #TRMPBF suffix.
**Versions
of this part are available with controlled manufacturing to support the quality and reliability requirements of automotive applications. These
models are designated with a #W suffix. Only the automotive grade products shown are available for use in automotive applications. Contact your
local Analog Devices account representative for specific product ordering information and to obtain the specific Automotive Reliability reports for
these models.
ELECTRICAL CHARACTERISTICS
PARAMETER
V
IN
Operating Voltage
Output Operating Voltage
Undervoltage Lockout Threshold on LDO
V
IN
Quiescent Current in Shutdown
V
IN
Quiescent Current in Burst Mode Operation
Oscillator Frequency
Oscillator Frequency Variation
Feedback Voltage
Feedback Voltage Line Regulation
Error Amplifier Transconductance
FB Pin Input Current
VC Source Current
VC Sink Current
RUN Pin Threshold—Accurate
RUN Pin Hysteresis
Run Pin Threshold—Logic
PROG Current
The
l
denotes the specifications which apply over the specified operating
junction temperature range, otherwise specifications are at T
A
= 25°C (Note 2). V
IN
= 24V, V
OUT
= 5V, unless otherwise noted.
CONDITIONS
V
LDO
≥ 2.7V, –55°C to 0°C
V
LDO
≥ 2.7V, 0°C to 150°C
(Note 5)
V
LDO
Rising
FB = 1.4V, Non-Bootstrapped (Note 6)
l
l
l
l
l
MIN
2.3
2.2
2.7
2.3
TYP
MAX
40
40
40
UNITS
V
V
V
V
µA
µA
2.5
3
50
2.7
1000
0.98
1200
0.1
1.0
0.2
120
1
–12
12
1400
1.02
kHz
%/V
V
%
µS
V
IN
= 12V to 36V
Measured on FB
V
IN
= 2.7V to 40V, Measured on FB
VC Current = ±5µA
FB = 1V
VC = 0.6V
VC = 0.6V
RUN Pin Rising
l
l
50
nA
µA
µA
1.185
0.3
38
18
2
0.90
1.205
140
0.7
40
20
4
40
0.925
1.7
2.6
100
1.29
1.1
42
22
6
0.95
2.3
V
mV
V
µA
µA
µA
µA/A
V
A
A
mA
%
%
l
Switch D Current = 1A
Switch D Current = 500mA
Switch D Current = 100mA (Note 3)
Ratio of PROG Current to SWD Current
(Note 3)
V
OUT
= 0V (Note 3)
(Note 3)
Percentage of Period SW2 is Low in Boost Mode
Percentage of Period SW1 is High in Boost Mode
Percentage of Period SW1 is High in Buck Mode
l
l
l
l
PROG Current Gain
PROG Voltage Threshold
Inductor Current Limit
Overload Current Limit
I
ZERO
Inductor Current Limit
Maximum Duty Cycle
Minimum Duty Cycle
1.3
90
85
95
88
0
%
Rev. D
For more information
www.analog.com
3
LTC3114-1
ELECTRICAL CHARACTERISTICS
N-Channel Switch Resistance
The
l
denotes the specifications which apply over the specified operating
junction temperature range, otherwise specifications are at T
A
= 25°C (Note 2). V
IN
= 24V, V
OUT
= 5V, unless otherwise noted.
Switch A (from PV
IN
to SW1)
Switch B (from SW1 to PGND)
Switch C (from SW2 to PGND)
Switch D (from PV
OUT
to SW2)
I
LDO
= 10mA
I
LDO
= 1mA to 10mA
I
LDO
= 1mA, V
IN
= 10V to 40V
V
LDO
= 2.5V
40
l
250
250
250
250
0.1
4.2
4.4
0.8
0.2
65
2
100
10
4.6
mΩ
mΩ
mΩ
mΩ
µA
V
%
%
mA
ms
ns
1.3
V
N-Channel Switch Leakage
LDO Output Voltage
LDO Load Regulation
LDO Line Regulation
LDO Current Limit
Soft-Start Time
SW1 and SW2 Forced Low Time
MODE Pin Logic Threshold
H = PWM Mode, L = Burst Mode Operation
l
0.5
0.9
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 LTC3114-1 is tested under pulsed load conditions such that
T
J
≈T
A
. The LTC3114E-1 is guaranteed to meet performance specifications
from 0°C to 85°C junction temperature. Specifications over the –40°C
to 125°C operating junction temperature range are assured by design,
characterization and correlation with statistical process controls. The
LTC3114I-1 specifications are guaranteed over the –40°C to 125°C
operating junction temperature range. The LTC3114H-1 specifications are
guaranteed over the –40°C to 150°C operating junction temperature range.
The LTC3114MP-1 specifications are guaranteed over the –55°C to 150°C
operating junction temperature range. High junction temperatures degrade
operating lifetime; operating lifetime is derated for junction temperatures
greater than 125°C. The maximum ambient temperature consistent with
these specifications is determined by specific operating conditions in
conjunction with board layout, the rated package thermal resistance and
other environmental factors.
The junction temperature (T
J
in degrees Celsius) is calculated from the
ambient temperature (T
A
in degrees Celsius) and the power dissipation
(P
D
in Watts) according to the following formula:
T
J
= T
A
+ (P
D
•
θ
JA
)
where
θ
JA
is the thermal impedance of the package.
Note 3:
Current measurements are performed when the LTC3114-1 is
not switching. The current limit values measured in operation will be
somewhat higher due to the propagation delay of the comparators. The
LTC3114-1 is tested in a proprietary non-switching test mode.
Note 4:
This IC includes overtemperature protection that is intended to
protect the device during momentary overload conditions. The maximum
rated junction temperature will be exceeded when this protection is active.
Continuous operation above the specified absolute maximum operating
junction temperature may impair device reliability or permanently damage
the device.
Note 5:
Operating output voltage can be programmed as low as 1.0V
nominal if the accurate programmable output current limit feature is not
required.
Note 6:
Connecting LDO/PLDO to the regulated 5V output (bootstrapping),
reduces quiescent current substantially. Typical no-load quiescent current
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