LTC3542 Series

500mA, 2.25MHz Synchronous Step-Down DC/DC Converter

Catalog

500mA, 2.25MHz Synchronous Step-Down DC/DC Converter

Part	Operating Temperature [Max]	Operating Temperature [Min]	Output Type	Supplier Device Package	Voltage - Input (Max) [Max]	Frequency - Switching	Current - Output	Function	Topology	Voltage - Output (Min/Fixed)	Package / Case	Number of Outputs	Output Configuration	Voltage - Input (Min) [Min]	Voltage - Output (Max) [Max]	Mounting Type
Analog Devices LTC3542EDC#TRPBF	85 °C	-40 °C	Adjustable	6-DFN (2x2)	5.5 V	2.25 MHz	500 mA	Step-Down	Buck	0.6 V	6-WFDFN Exposed Pad	1	Positive	2.5 V	5.5 V	Surface Mount
Analog Devices LTC3542IS6#TRMPBF	125 ¯C	-40 °C	Adjustable	TSOT-23-6	5.5 V	2.25 MHz	500 mA	Step-Down	Buck	0.6 V	SOT-23-6 Thin TSOT-23-6	1	Positive	2.5 V	5.5 V	Surface Mount
Analog Devices LTC3542IS6#TRPBF	125 ¯C	-40 °C	Adjustable	TSOT-23-6	5.5 V	2.25 MHz	500 mA	Step-Down	Buck	0.6 V	SOT-23-6 Thin TSOT-23-6	1	Positive	2.5 V	5.5 V	Surface Mount

Catalog

500mA, 2.25MHz Synchronous Step-Down DC/DC Converter

Key Features

• High Efficiency: Up to 96%

• High Peak Switch Current: 1000mA

• Low Output Ripple (<20mVP-PTypical) Burst Mode Operation: Only 26µA

• Very Low Quiescent Current: Only 26µA

• 2.5V to 5.5V Input Voltage Range

• 2.25MHz Constant Frequency Operation

• 1MHz to 3MHz External Frequency Synchronization

• Low Dropout Operation: 100% Duty Cycle

• No Schottky Diode Required

• Internal Soft-Start Limits Inrush Current

• 0.6V Reference Allows Low Output Voltages

• Shutdown Mode Draws <1µA Supply Current

• ±2% Output Voltage Accuracy

• Current Mode Operation for Excellent Line and Load Transient Response

• Overtemperature Protected

• Available in 6-Lead 2mm × 2mm DFN and Small TSOT

Description

The LTC3542 is a high efficiency monolithic synchronous buck converter using a constant frequency, current mode architecture. Supply current during operation is only 26µA, dropping to <1µA in shutdown. The 2.5V to 5.5V input voltage range makes the LTC3542 ideally suited for single Li-Ion battery-powered applications. 100% duty cycle provides low dropout operation, extending battery life in portable systems. The output voltage is adjustable from 0.6V to VIN. Internal power switches are optimized to provide high efficiency and eliminate the need for an external Schottky diode.Switching frequency is internally set at 2.25MHz, allowing the use of small surface mount inductors and capacitors, and it can synchronize to an external clock signal with a frequency range of 1MHz to 3MHz through the MODE/ SYNC pin. The LTC3542 is specifically designed to work well with ceramic output capacitors, achieving very low output voltage ripple and a small PCB footprint.The LTC3542 can be configured for the power saving Burst Mode®Operation. For reduced noise and RF interference, the MODE/SYNC pin can be configured for pulse skipping operation.ApplicationsCellular TelephonesWireless and DSL ModemsDigital CamerasMP3 PlayersPDAs and Other Handheld Devices