LTC3544 Selling Leads, Price trend, LTC3544 DataSheet download, circuit diagram from SeekIC.com

Features: ` High Effi ciency: Up to 95%` Four Independent Regulators Provide Up to 300mA, 200mA, 200mA and 100mA Output Current` 2.25V to 5.5V Input Voltage Range` 2.25MHz Constant-Frequency Operation` No Schottky Diodes Required` Extremely Low Channel-to-Channel Transient Crosstalk` Low Ripple (2...

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SeekIC No. : 004402289 Detail

LTC3544: Features: ` High Effi ciency: Up to 95%` Four Independent Regulators Provide Up to 300mA, 200mA, 200mA and 100mA Output Current` 2.25V to 5.5V Input Voltage Range` 2.25MHz Constant-Frequency Operati...

LTC3544 Data Sheet

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Part Number:: LTC3544
Supply Ability:: 5000

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Product Details

Description

Features:

` High Effi ciency: Up to 95%
` Four Independent Regulators Provide Up to 300mA, 200mA, 200mA and 100mA Output Current
` 2.25V to 5.5V Input Voltage Range
` 2.25MHz Constant-Frequency Operation
` No Schottky Diodes Required
` Extremely Low Channel-to-Channel Transient Crosstalk
` Low Ripple (20mV_P-P) Burst Mode Operation: I_Q = 70A (All Channels On)
` 0.8V Reference Allows Low Output Voltages
` Shutdown Mode Draws <1A Supply Current
` Current Mode Operation for Excellent Line and Load Transient Response
` Overtemperature Protected
` Low Profi le (3mm * 3mm) 16-Lead QFN Package

Application

· Cellular Telephones
· Personal Information Appliances
· Wireless and DSL Modems
· Digital Still Cameras
· Media Players
· Portable Instruments

Pinout

Connection Diagram

Specifications

Input Supply Voltage ...................................0.3V to 6V
RUNx .............................................0.3V to (V_IN + 0.3V)
V_FBx ...............................................0.3V to (V_IN + 0.3V)
SWx ...............................................0.3V to (V_IN + 0.3V)
300mA P-Channel Source Current (DC) (Note 8) ..450mA
300mA N-Channel Sink Current (DC) (Note 8) ......450mA
200mA P-Channel Source Current (DC) (Note 8) ..300mA
200mA N-Channel Sink Current (DC) (Note 8) ......300mA
100mA P-Channel Source Current (DC) (Note 8) ..200mA
100mA N-Channel Sink Current (DC) (Note 8) ......200mA
Peak 300mA SW Sink and Source Current
(Note 8) ................................................................600mA
Peak 200mA SW Sink and Source Current
(Note 8) ................................................................400mA
Peak 100mA SW Sink and Source Current
(Note 8) ................................................................200mA
Operating Temperature Range ..................40 to 85
Junction Temperature (Notes 3, 4) ........................ 125
Storage Temperature Range ...................65 to 125

Description

The LTC^®3544 is a quad, high efficiency, monolithic synchronous buck regulator using a constant-frequency, current mode architecture. The four regulators operate independently with separate run pins. The 2.25V to 5.5V input voltage range makes the LTC3544 well suited for single Li-Ion/polymer battery-powered applications. 100% duty cycle provides low dropout operation, extending battery runtime in portable systems. Low ripple Burst Mode® operation increases effi ciency at light loads, further extending battery runtime with typically only 20mV of ripple.

Switching frequency of LTC3544 is internally set to 2.25MHz, allowing the use of small surface mount inductors and capacitors. The internal synchronous switches increase effi ciency and eliminate the need for external Schottky diodes. Low output voltages are easily supported with the 0.8V feedback reference voltage.

The LTC3544 is available in a low profi le (0.75mm) (3mm × 3mm) QFN package.

LTC3544

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