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LTC1504A Datasheet(PDF) 1 Page - Linear Technology |
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LTC1504A Datasheet(HTML) 1 Page - Linear Technology |
1 / 12 page 1 LTC1504A 500mA Low Voltage Step-Down Synchronous Switching Regulator Daisy-Chained Control Outputs FEATURES The LTC ®1504A is a self-contained, high efficiency syn- chronous buck switching regulator. It includes a pair of on-chip 1.3 Ω power switches, enabling it to supply up to 500mA of load current. Efficiency peaks at 92%, minimiz- ing heat and wasted power. The synchronous buck archi- tecture allows the output to source or sink current as required to keep the output voltage in regulation. 100% duty cycle operation minimizes dropout voltage. The LTC1504A is available in adjustable and fixed 3.3V output versions. An adjustable current limit circuit pro- vides protection from overloads. The internal 1% refer- ence combined with a sophisticated voltage feedback loop provides optimum output voltage accuracy and fast load transient response. The LTC1504A is specified to operate with input voltages between 4V and 10V. Contact the LTC factory for guaranteed specifications at 2.7V supply. The LTC1504A is a pin-compatible, functional upgrade to the LTC1504. The LTC1504A is available in a plastic SO-8 package. DESCRIPTION s 500mA Output Current at 3.3V Output s Up to 92% Peak Efficiency s 100% Maximum Duty Cycle s Internal Reference Trimmed to 1% s Output Can Source or Sink Current s Requires as Few as Four External Components s Input Voltage Range: 4V to 10V s Adjustable Current Limit s Small SO-8 Package s 200kHz Switching Frequency Can Typically be Synchronized Up to 500kHz Minimum Part Count 5V to 3.3V Regulator 5V to 3.3V Efficiency LOAD CURRENT (mA) 10 100 90 80 70 60 50 40 30 20 10 0 100 500 1504 • TA02 IMAX SHDN SS COMP VCC GND SW SENSE + 5V SHUTDOWN NC NC 1000pF + 3.3V AT 500mA LEXT 50 µH CIN: AVX TPSC226M016R0375 COUT: AVX TAJC476M010 LEXT: COILTRONICS CTX50-1P 1504A • TA01 LTC1504A-3.3 CIN 22 µF COUT 47 µF APPLICATIONS s Small Portable Digital Systems s Active Termination s Auxiliary Output Voltage Supplies s Minimum Part Count/Size Switchers TYPICAL APPLICATION , LTC and LT are registered trademarks of Linear Technology Corporation. |
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