1MHz/2MHz Synchronous Step-Up DC/DC Converters - Linear Technology
Description
LTC3539/LTC3539-2
2A, 1MHz/2MHz Synchronous Step-Up
DC/DC Converters
FEATURES
n Delivers 3.
3V at 900mA From 2 Alkaline/NiMH Cells n Delivers 5V at 900mA From a Lithium-Polymer
Battery n VIN Start-Up Voltage: 700mV n 1.
5V to 5.
25V VOUT Range n Up to 94% Efficiency n VIN > VOUT Operation n ±1.
5% Feedback Voltage Tolerance n 1MHz (LTC3539) or 2MHz (LTC3539-2) Fixed
Frequency Operation n Output Disconnect n Selectable Burst Mode® or PWM Operation n 10µA Quiescent Current n Logic Controlled Shutdown: <1µA n Requires Only 6 External Components n Low Profile (2mm × 3mm × 0.
75mm) DFN Package
APPLICATIONS
n Medical Instruments n Portable Bar Code Scanners n Noise Canceling Headphones n Portable GPS Navigation n Handheld PCs
DESCRIPTION
The LTC®3539/LTC3539-2 are synchronous, 2A step-up DC/DC converters with output disconnect.
Synchronous rectification enables high efficiency in the low profile 2mm × 3mm DFN package.
Battery life is extended with a 700mV start-up voltage and operation down to 500mV once started.
A switching frequency of 1MHz (LTC3539) or 2MHz (LTC3539-2) minimizes solution footprint by allowing the use of tiny, low profile inductors and ceramic capacitors.
The current mode PWM design is internally compensated, reducing external parts count.
The LTC3539/LTC3539-2 feature a pin-enabled automatic Burst Mode operation at light load conditions.
Anti-ring circuitry reduces EMI by damping the inductor in discontinuous mode.
Additional features include a low shutdown current of under 1µA and thermal overload protection.
The LTC3539/LTC3539-2 are offered in a 2mm × 3mm × 0.
75mm DFN package.
L, LT, LTC, LTM and Burst Mode are registered trademarks and ThinSOT is a trademark of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
TYPICAL APPLICATION
Wide VIN, High Power 3.
3V Regulator
Efficiency and Power Loss vs Load Current
VIN 1.
8V TO 3.
6V
2.
2µF
PWM BURST
4.
7µH
VIN
SW
LTC3539
MODE
VOUT
OFF ON
SHDN GND
FB PG...
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