National Semiconductor LM27952SD/NOPB Constant Current: Yes Current - Output / Channel: 30mA Efficiency: 85% Frequency: 525kHz ~ 975kHz Internal Driver: Yes Internal Switch(s): Yes Mounting Type: Surface Mount Number Of Outputs: 4 Operating Temperature: -40?°C ~ 85?°C Package / Case: 14-LLP Series: PowerWise?® Topology: PWM, Switched Capacitor (Charge Pump) Type: Backlight, White LED Type - Primary: Backlight, General Purpose Type - Secondary: White LED Voltage - Output: 2.5 V ~ 3.9 V Voltage - Supply: 3 V ~ 5.5 V Other Names: LM27952SD, LM27952SDTR