SC4530WLTRT Semtech

SC4530 30V, 300mA Output Micropower Step-Down Switching Regulator POWER MANAGEMENT Features Description Input Voltage Range: 3V to 30V The SC4530 is a micropower hysteretic current-mode Low Quiescent Current: Drawing 9 mA from V when step-down switching regulator capable of providing up IN Stepping Down from 2V to 3.3V at No Load to 300mA of output current from 3V to 30V input voltage High Efficiency from 2V Input to 5V Output range. It is designed to provide very high standby efficiency > 80% at 650mA while simplifying design. > 85% at 0mA - 300mA Up to 300mA Continuous DC Output Current At light loads, the SC4530 switches only as needed to main- Integrated Power Switch and Schottky Diodes tain regulation, while idling most of the time, to improve Low Output Ripple efficiency. Typical quiescent currents from V and BIAS IN < mA Shutdown Current are 7 mA and 26 mA respectively. The control scheme pro- Hysteretic Current-Mode Control duces less than 0mV of FB voltage ripple at light loads. The Cycle-by-Cycle Current Limiting SC4530 automatically switches to continuous-conduction Alternating Between Micropower Idling and Switch- mode at heavy loads. ing States at Light Loads to Conserve Power Output Short-Circuit Protection The SC4530 has integrated power devices and on-chip 2 Solution Footprint as Small as 50mm control circuitry, simplifying design and enabling a solu- 2 Low-Profile 3mm x 2mm MLPD 8-Lead Package tion footprint as small as 50mm . Only an inductor and a few passive components are needed to complete a DC-DC regulator. The inductor current hysteretic control of SC4530 Applications makes it inherently short-circuit robust. The wide input voltage range enables the device to operate from a variety Portable Equipment of input sources, including single- or multi-cell batteries, Notebook Computers system rails and wall transformers. Distributed Supplies Backup Power Supplies Typical Application Circuit Efficiency vs Load Current 90 V = 12V IN BIAS 80 O F F O N EN BST C 3 0.22 F ,10V V = 24V IN V L1 IN O U T SW IN 70 33 H 5V /0.3A 7V - 30V S C 4530 C 4 R 1 10pF 619k C 2 C 1 F B 60 4.7 F 22 F C 5 R 2 G N D 200k 33pF 50 V = 5V OUT 40 L1: C oilcraft LPS6225 C 1: M urata G R M 31C R 61A226K 0.1 1.0 10.0 100.0 1000.0 C 2: M urata G R M 31C R 71H 475K Load Current (mA) Figure 1. 5V Output Step-Down Converter Rev. 2.5 C 4=10pF C 5=33pF Verified 1/12/2012 C 4=22pF C 5=68pF Verified 1/24/2011 Efficiency (%)4530 xxxx SC4530 Pin Configuration Ordering Information Device Package ( ) (2) SC4530WLTRT MLPD-W-8 3x2 SC4530EVB Evaluation Board Notes: ( ) Available in tape and reel only. A reel contains 3,000 devices. FB 1 8 E N (2) Available in lead-free package only. Device is WEEE and RoHS B IA S 2 7 N C compliant. 9 B S T 3 6 IN SW 4 5 G N D = 80C/W JA MLPD: 3mm x 2mm 8 Lead Marking Information XXXX - Lot Number 2