LED Driver provides 4.5 V regulated output.
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Press Release Summary:
Model AQ9156 features 1.5X charge-pump circuit that uses 2 ceramic bucket capacitors and 2 filter capacitors for VIN and VOUT. Unit drives up to 6 parallel white LEDs, with typical operating input voltage from 3.0-6.0 V. It offers selectable switching frequency of 8, 32, 262, or 650 kHz. LED brightness can be adjusted via applying PWM signal on either ENA pin or CLK2 pin. Internal over-temperature and over-current management provides short circuit protection.
Original Press Release:
Arques Technology introduces a Charge-Pump White LED Driver
Arques Technology introduces the AQ9156, a 1.5X switched-capacitor (charge pump) regulator, ideal for white LED applications. The output is a regulated 4.5V, up to 120 mA, and capable of driving up to six parallel white LEDs, with a typical operating input voltage range from 3.0V to 6.0V.
It features an efficient, 1.5X charge-pump circuit that uses only two ceramic bucket capacitors and two small filter capacitors for VIN and VOUT, allowing a compact, low profile system design. The AQ9156 offers a selectable switching frequency of 8 kHz, 32 kHz, 262 kHz, or 650 kHz. The LED brightness can be adjusted via applying a PWM signal on either the ENA pin or CLK2 pin.
The AQ9156 offers a unique performance advantage over previously available devices, allowing the highest level of efficiency. A priority design architecture (patent pending) maintains high efficiency (> 80%), at both below 3.2 Vin, resulting in longer battery life, and above 5.25V, when an adapter is plugged in, keeping the part cool.
The AQ9156 output voltage is regulated to 4.5V, +/-5% over the line and load ranges, wit low output ripple voltage. Internal over-temperature and over-current management provides short circuit protection.
The AQ9156 is available in a small MLP-10 or MSOP-10 package. ($0.98 ea/1000). Evaluation parts available.
