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SC4530 数据表(PDF) 1 Page - Semtech Corporation |
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SC4530 数据表(HTML) 1 Page - Semtech Corporation |
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1 / 23 page  POWER MANAGEMENT 30V, 300mA Output Micropower Step-Down Switching Regulator Typical Application Circuit September 24, 202 Applications Portable Equipment Notebook Computers Distributed Supplies Backup Power Supplies 5V Output Step-Down Converter Figure 1. L1: Coilcraft LPS4018 C2: Murata GRM32ER71H475K C1: Murata GRM31CR60J226K SC4530 SW BST IN BIAS OUT 5V/0.3A R1 619k VIN 200k R2 L1 33µH EN C3 0.22µF C2 4.7µF GND FB C1 22µF C4 10pF OFF ON C4=22pF C5=68pF Verified 1/24/2011 C4=10pF C5=33pF Verified 1/12/2012 SC4530 Features Input Voltage Range: 3V to 30V Low Quiescent Current: Drawing 9mA from V IN when Stepping Down from 2V to 3.3V at No Load High Efficiency from 2V Input to 5V Output > 80% at 650mA > 85% at 0mA - 300mA Up to 300mA Continuous DC Output Current Integrated Power Switch and Schottky Diodes Low Output Ripple <mA Shutdown Current Hysteretic Current-Mode Control Cycle-by-Cycle Current Limiting Alternating Between Micropower Idling and Switch- ing States at Light Loads to Conserve Power Output Short-Circuit Protection Solution Footprint as Small as 50mm2 Low-Profile 3mm x 2mm MLPD 8-Lead Package Description The SC4530 is a micropower hysteretic current-mode step-down switching regulator capable of providing up to 300mA of output current from 3V to 30V input voltage range. It is designed to provide very high standby efficiency while simplifying design. At light loads, the SC4530 switches only as needed to main- tain regulation, while idling most of the time, to improve efficiency. Typical quiescent currents from V IN and BIAS are 7mA and 26mA respectively. The control scheme pro- duces less than 0mV of FB voltage ripple at light loads. The SC4530 automatically switches to continuous-conduction mode at heavy loads. The SC4530 has integrated power devices and on-chip control circuitry, simplifying design and enabling a solu- tion footprint as small as 50mm2. Only an inductor and a few passive components are needed to complete a DC-DC regulator. The inductor current hysteretic control of SC4530 makes it inherently short-circuit robust. The wide input voltage range enables the device to operate from a variety of input sources, including single- or multi-cell batteries, system rails and wall transformers. Efficiency vs Load Current 40 50 60 70 80 90 0.1 1.0 10.0 100.0 1000.0 Load Current (mA) VIN = 12V VIN = 24V VOUT = 5V |
类似零件编号 - SC4530 |
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类似说明 - SC4530 |
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