LTC3114-1_15 Datasheet, PDF (1/34 Pages) Linear Technology – 40V, 1A Synchronous Buck-Boost DC/DC Converter with Programmable Output Current

LTC3114-1
40V, 1A Synchronous
Buck-Boost DC/DC Converter with
Programmable Output Current
FEATURES
n _{Regulates VOUT Above, Below or Equal to VIN}
n _{Single Inductor}
n _{Wide VIN Range: 2.2V to 40V}
n _{Wide VOUT Range: 2.7V to 40V}
n _{1A Output Current in Buck Mode}
n _{0.5A Output Current, VIN = 3.6V, VOUT = 5V}
n _{Programmable Average Output Current}
n _{Up to 96% Efficiency}
n _{Burst Mode}^® _{Operation, 30µA No-Load IQ}
n _{Current Mode Control}
n _{1.2MHz Ultralow Noise PWM}
n _{Accurate RUN Pin Threshold}
n _{Thermally Enhanced, 16-lead 3mm × 5mm DFN}
and TSSOP Packages
APPLICATIONS
n _{24V/28V Industrial Power Supply}
n _{12V Lead-Acid to 12V Regulator}
n _{High Power LED Driver}
n _{12V/24V Solar Panel Battery Charging Systems}
n _{Automotive Power Systems}
DESCRIPTION
The LTC^®3114-1 is a versatile, wide operating voltage range
synchronous monolithic buck-boost DC/DC converter with
programmable average output current. The LTC3114-1’s
proprietary buck-boost PWM control circuitry 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 accurate RUN pin.
Quiescent current is just 3µA in shutdown. Overtempera-
ture 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.
L, LT, LTC, LTM, Burst Mode, LTspice, µModule, Linear Technology and the Linear logo are
registered trademarks and No R_SENSE is a trademark of Linear Technology Corporation. All other
trademarks are the property of their respective owners.
TYPICAL APPLICATION
V_IN
2.7V TO 40V
33nF
68nF
10µF
20k
6.8µH
SW1
SW2
BST1
BST2
LTC3114-1
V_IN
PV_OUT
PV_IN
LDO
RUN
PLDO
PROG
MODE
GND
FB
VC
PGND
68nF
4.7µF ^2M
V_OUT
5V
1A
30µF _{VIN > 5V}
4700pF
27.4k
499k
31141 TA01a
Efficiency vs Input Voltage
95
90
85
80
75
70
1
I_LOAD = 300mA
I_LOAD = 600mA
10
INPUT VOLTAGE (V)
40
31141 TA01b
For more information www.linear.com/LTC3114-1
31141fa
1