Datasheet LTC3534 (Analog Devices)
| Manufacturer | Analog Devices |
| Description | 7V, 500mA Synchronous Buck-Boost DC/DC Converter |
| Pages / Page | 20 / 1 — FeaTures. DescripTion. Regulated Output with Input Voltages Above,. Below … |
| File Format / Size | PDF / 468 Kb |
| Document Language | English |
FeaTures. DescripTion. Regulated Output with Input Voltages Above,. Below or Equal to the Output
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LTC3534 7V, 500mA Synchronous Buck-Boost DC/DC Converter
FeaTures DescripTion
n
Regulated Output with Input Voltages Above,
The LTC®3534 is a wide VIN range, highly efficient, fixed
Below or Equal to the Output
frequency, buck-boost DC/DC converter that operates n
2.4V to 7V VIN and 1.8V to 7V VOUT Ranges
from input voltages above, below or equal to the output n
5V VOUT at 500mA from 4 AA Cells
voltage. The topology incorporated in the IC provides a n
Single Inductor
continuous transfer function through all operating modes, n
Synchronous Rectification: Up to 94% Efficiency
making the product ideal for multi-cell Alkaline/NiMH or n
Burst Mode
®
Operation with 25µA IQ
single Lithium-Ion/Polymer applications where the output n
Output Disconnect in Shutdown
voltage is within the battery voltage range. n 1MHz Switching Frequency The LTC3534 offers extended V n IN and VOUT ranges of 2.4V <1µA Shutdown Current to 7V and 1.8V to 7V, respectively. Quiescent current is n Small Thermally Enhanced 16-Lead (5mm × 3mm × only 25µA in Burst Mode operation, maximizing battery 0.75mm) DFN and 16-Lead GN Packages life in portable applications. Burst Mode operation is user
applicaTions
controlled and can be enabled by driving the PWM pin low. If the PWM pin is driven high then fixed frequency n switching is enabled. Medical Instruments n Portable Barcode Readers Other features include fixed 1MHz operating frequency, a n Portable Inventory Terminals <1µA shutdown, short-circuit protection, programmable n USB to 5V Supply soft-start, current limit and thermal overload protection. n Handheld GPS The LTC3534 is available in the thermally enhanced 16-lead (3mm × 5mm) DFN and 16-lead GN packages. L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. Burst Mode is a registered trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners.
Typical applicaTion 4 AA Cells to 5V at 500mA Buck-Boost Converter 4 AA Cells to 5V Efficiency vs VIN
100 5µH 95 SW1 SW2 V V OUT PWM I IN OUT = 300mA PVIN VOUT 5V 3.6V TO 6.4V 4 AA + V 90 IN 10k 649k 22µF 500mA CELLS 10µF LTC3534 PWM IOUT = 500mA 33pF FB 85 OFF ON RUN/SS EFFICIENCY (%) 15k BURST PWM PWM VC 80 PGND1 GND PGND2 330pF 162k 3534 TA01a 753.6 4.0 4.4 4.8 5.2 5.6 6.0 6.4 VIN (V) 3534 TA01b 3534fb For more information www.linear.com/LTC3534 1 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Revision History Related Parts
FeaTures DescripTion
n
Regulated Output with Input Voltages Above,
The LTC®3534 is a wide VIN range, highly efficient, fixed
Below or Equal to the Output
frequency, buck-boost DC/DC converter that operates n
2.4V to 7V VIN and 1.8V to 7V VOUT Ranges
from input voltages above, below or equal to the output n
5V VOUT at 500mA from 4 AA Cells
voltage. The topology incorporated in the IC provides a n
Single Inductor
continuous transfer function through all operating modes, n
Synchronous Rectification: Up to 94% Efficiency
making the product ideal for multi-cell Alkaline/NiMH or n
Burst Mode
®
Operation with 25µA IQ
single Lithium-Ion/Polymer applications where the output n
Output Disconnect in Shutdown
voltage is within the battery voltage range. n 1MHz Switching Frequency The LTC3534 offers extended V n IN and VOUT ranges of 2.4V <1µA Shutdown Current to 7V and 1.8V to 7V, respectively. Quiescent current is n Small Thermally Enhanced 16-Lead (5mm × 3mm × only 25µA in Burst Mode operation, maximizing battery 0.75mm) DFN and 16-Lead GN Packages life in portable applications. Burst Mode operation is user
applicaTions
controlled and can be enabled by driving the PWM pin low. If the PWM pin is driven high then fixed frequency n switching is enabled. Medical Instruments n Portable Barcode Readers Other features include fixed 1MHz operating frequency, a n Portable Inventory Terminals <1µA shutdown, short-circuit protection, programmable n USB to 5V Supply soft-start, current limit and thermal overload protection. n Handheld GPS The LTC3534 is available in the thermally enhanced 16-lead (3mm × 5mm) DFN and 16-lead GN packages. L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. Burst Mode is a registered trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners.
Typical applicaTion 4 AA Cells to 5V at 500mA Buck-Boost Converter 4 AA Cells to 5V Efficiency vs VIN
100 5µH 95 SW1 SW2 V V OUT PWM I IN OUT = 300mA PVIN VOUT 5V 3.6V TO 6.4V 4 AA + V 90 IN 10k 649k 22µF 500mA CELLS 10µF LTC3534 PWM IOUT = 500mA 33pF FB 85 OFF ON RUN/SS EFFICIENCY (%) 15k BURST PWM PWM VC 80 PGND1 GND PGND2 330pF 162k 3534 TA01a 753.6 4.0 4.4 4.8 5.2 5.6 6.0 6.4 VIN (V) 3534 TA01b 3534fb For more information www.linear.com/LTC3534 1 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Revision History Related Parts
