|
Features
Drives 4 Individual Common-Anode LEDs with up to 20mA each for a Main 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 Micro SMD Package:
(2.1mm x 2.4mm x 0.6mm)
Description The LM27953 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. Regulated internal current sources deliver excellent current and brightness
matching in all LEDs.
The LED driver current sinks can be used to backlight a main phone display with up to 4 LEDs. The low-side current drivers
accommodate common-anode-type LEDs. The current sinks can also drive standard two-terminal LEDs, and provide other general
lighting functions (keypad lighting, fun lighting, etc). The brightness of the LEDs can be adjusted independently with an
external resistor.
The LM27953 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 LM27953 is available in National’s chip-scale 18-bump micro SMD package.
Applications
Mobile Phone Display Lighting
Mobile Phone Keypad Lighting
PDAs
General LED Lighting
|
Also Recommended
| LM2796▲ | Drives 7 LEDs |
| LP3936 | 6 White LED And 1 RGB Driver With Inductive Boost |
| LM2794▲ | Drives 4 LEDs, With Active-Low Shutdown Pin |
| LM2795▲ | Drives 4 LEDs, With Active-High Shutdown Pin |
| LM3570▲ | Drives 3 LEDs With Regulated Charge Pump |
| LP3933 | 6 White LED And 2 RGB Drivers With Inductive Boost |
|
|
