ST1CC40DR STMicroelectronics

ST1CC40 3 A monolithic step-down current source with synchronous rectification Datasheet - production data Applications Battery charger Signage Emergency lighting High brightness LED driving General lighting 62 1 9)4)3 Description The ST1CC40 device is an 850 kHz fixed switching frequency monolithic step-down DC-DC Features converter designed to operate as precise constant current source with an adjustable current 3.0 V to 18 V operating input voltage range capability up to 3 A DC. The regulated output 850 kHz fixed switching frequency current is set connecting a sensing resistor to the 100 mV typ. current sense voltage drop feedback pin. The embedded synchronous rectification and the 100 mV typical R 6 A standby current in inhibit mode SENSE voltage drop enhance the efficiency performance. 7% output current accuracy The size of the overall application is minimized Synchronous rectification thanks to the high switching frequency and ceramic output capacitor compatibility. The device 95 m HS / 69 m LS typical R DS(on) is fully protected against thermal overheating, Peak current mode architecture overcurrent and output short-circuit. Inhibit mode Embedded compensation network minimizes the current consumption in standby. The ST1CC40 is available in VFQFPN8 4 mm x 4 Internal current limiting mm 8-lead, and standard SO8 package. Ceramic output capacitor compliant Thermal shutdown Figure 1. Typical application circuit 3 4 ,, . 6 ) 3 . 7 6 ) 3 7 . 6 ) ( . ) ( . ) & . 0 % 0 ) 4 &, 3 2 4 5 / . - V August 2021 DocID18279 Rev 7 1/38 This is information on a product in full production. www.st.comContents ST1CC40 Contents 1 Pin settings 6 1.1 Pin connection 6 1.2 Pin description 6 2 Maximum ratings 7 3 Thermal data . 7 4 Electrical characteristics . 8 5 Functional description . 9 5.1 Power supply and voltage reference 10 5.2 Voltage monitor 10 5.3 Soft-start 10 5.4 Error amplifier 10 5.5 Inhibit .11 5.6 Thermal shutdown .11 6 Application notes 12 6.1 Closing the loop 12 6.2 G (s) control to output transfer function 12 CO 6.3 Error amplifier compensation network . 13 6.4 LED small signal model 15 6.5 Total loop gain . 16 Example . 16 6.6 eDesignSuite software . 18 7 Application information . 20 7.1 Component selection 20 7.1.1 Sensing resistor . 20 7.1.2 Inductor and output capacitor selection . 20 7.1.3 Input capacitor 22 7.2 Layout considerations . 23 2/38 DocID18279 Rev 7