L6935TR STMicroelectronics

L6935 High performance 3 A ULDO linear regulator Features Up to 5 V input voltage range 60 m max R DS(on) 35 A shut-down current 3 A maximum output current VFQFPN20 Split bias and power supplies (4.0 x 4.0 x 1.0 mm) Adjustable output voltage: 0.5 V to 3.0 V Excellent load and line regulation: 1 % Description accuracy (over temperature) L6935 is an ultra low drop output linear regulator MLCC supported operating up to 5 V input and is able to support Programmable soft-start output current up to 3 A. Designed with an Short-circuit protection internal low-R N-channel MOSFET, it can DS(on) be used for on-board DC-DC conversions saving 3.5 A overcurrent protection in real estate, list of components and power Thermal shut-down dissipation. VFQFPN20 4 x 4 x 1.0 mm package Bias input and power input are split to allow linear conversion from buses lower than 1.2 V minimizing power losses. L6935 provides the application with an adjustable Applications voltage from 0.5 V to 3.0 V with a voltage regulation accuracy of 1 %. soft-start is available Motherboard to program the output voltage rise-time according Mobile PC to the external capacitor connected. Hand-held instruments Enable and Power Good functions make L6935 PCMCIA cards suitable for complex systems and programmable start-up sequencing. Processors I/O The current limit at 3 A protects the system during Chipset and RAM supply a short circuit. The current is sensed in the power DMOS in order to limit the power dissipation. Thermal shut down limits the internal temperature at 150 C with a hysteresis of 20 C. Table 1. Device summary Order codes Package Packing Tube L6935 VFQFPN20 L6935TR Tape and reel May 2008 Rev 1 1/20 www.st.com 20Contents L6935 Contents 1 Typical application circuit and block diagram 3 1.1 Application circuit 3 1.2 Block diagram . 4 2 Pins description and connection diagrams 5 2.1 Pin descriptions . 5 3 Electrical specifications 7 3.1 Absolute maximum ratings . 7 3.2 Thermal data . 7 3.3 Electrical characteristics . 8 4 Typical performances 9 5 Device description . 11 5.1 Soft-start 11 5.2 Power Good . 12 5.3 VIN vs VBIAS 12 5.4 Protections 12 5.4.1 Over-current protection . 12 5.4.2 Thermal protection . 13 6 Application information . 14 6.1 Components selection . 14 6.1.1 Input capacitor 14 6.1.2 Output capacitor 14 6.2 VIN, VBIAS and sequencing 15 7 Demonstration board description . 16 8 VFQFPN20 mechanical data and package dimensions 18 9 Revision history . 19 2/20