Dual-Display White LED Driver With 3/2x Switched Capacitor Boost

The LM27961 is a charge-pump-based white-LED driver that is ideal for mobile phone Display backlighting. It is intended to drive 4 LEDs for a main phone Display backlight and 3 LEDs for a sub-display backlight. Regulated internal current sources deliver excellent current and brightness matching in all LEDs
The LED Driver current sources are split into two independently controlled groups. The primary group (Group A) CAN be used to backlight a main phone Display with up to 4 LEDs The low-side current drivers of Group A accommodate common-anode-type LEDs The second group (Group B) CAN backlight a secondary Display with up to 3 LEDs The high-side current drivers of Group B accommodate common-cathode-type LEDs Both Group A and Group B CAN also drive standard two-terminal LEDs and provide other general lighting functions (keypad lighting, fun lighting, etc). The brightness of the two LED groups CAN be adjusted independently with external resistors.
The LM27961 works off an extended Li-Ion input voltage range (2.7V to 5.5V). Voltage boost is achieved with a high-efficiency 3/2-gain Charge Pump
The LM27961 is available in National's chip-scale 18-bump micro SMD package.
By National Semiconductor Corporation
LM27961 's PackagesLM27961 's pdf datasheet

LM27961 Pinout, Pinouts
LM27961 pinout,Pin out
This is one package pinout of LM27961,If you need more pinouts please download LM27961's pdf datasheet.

LM27961 Application circuits
LM27961 circuits
This is one application circuit of LM27961,If you need more circuits,please download LM27961's pdf datasheet.

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