LM27961 - 具有 3/2x 开关电容器升压的双显示白光 LED 驱动器

LM27961是TI德州仪器公司的一款背光产品，LM27961是具有 3/2x 开关电容器升压的双显示白光 LED 驱动器，本站介绍了LM27961的封装应用图解、特点和优点、功能等，并给出了与LM27961相关的TI元器件型号供参考。

LM27961 - 具有 3/2x 开关电容器升压的双显示白光 LED 驱动器 - 背光 - LED驱动器 - 德州仪器

产品描述

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 TI’s chip-scale 18-bump DSBGA package.

产品特性

Drives 4 Individual Common-Anode LEDs with up to 20mA each for a Main Display Backlight
Drives 3 Individual Common-Cathode LEDs with up to 20mA each for a Sub-Display Backlight
Independent Resistor-Programmable Current Setting
Excellent Current and Brightness Matching
High-Efficiency 3/2x Charge Pump
Extended Li-Ion Input: 2.7V to 5.5V
PWM Brightness Control: 100Hz - 1kHz
18-bump Thin DSBGA Package: (2.1mm x 2.4mm x 0.6mm)

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