Advanced Analogic Technologies rolled out two 4-channel, charge pump-based LED drivers for larger LCD screens in reduced feature entry-level cell phones and portable devices. The AAT3104 and AAT3195 are available in 2 x 2.1mm packages, and offer 16-step, 32-step or PWM current control in the small footprint. Based on their use of an efficient charge pump with 1x and 2x modes, the drivers reduce external component count by 25% over competing solutions.
The AAT3195 supports common sources for common cathode configurations, driving up to 4 LEDs at up to 30mA each. It automatically switches between 1x and 2x mode to deliver efficiency, current matching and accuracy. It operates at a 1MHz switching frequency and is offered in three versions with different interfaces:
- AAT3195-1 delivers 30mA current across 32-steps using the S2 Cwire interface.
- AAT3195-2 supports 20mA current across 32 steps also using the S2 Cwire interface.
- The AT3195-3 features a PWM interface
In comparison, the AAT3104 provides common current sinks for command anode configurations. It is capable of driving up to four LEDs at up to 30mA each. The device automatically switches between a 1x and 2x mode to maximize efficiency and optimize LED current accuracy and matching.
Both drivers feature automatic soft-start, a low-current shutdown mode to conserve power, and integrated thermal protection.
Both options are qualified cross the -40° C to +85° C temperature range and are available in 2 x 2.1mm, 10-lead SC70JW packages. The AAT3104 and AAT3195 sell for $0.87 in 1K quantities.