AL3157 low noise charge pump DC conversion application circuit
Source: InternetPublisher:方世玉223 Keywords: Charge pump application circuit low noise DC conversion Updated: 2020/10/15
AL3157 is a low-noise constant frequency charge pump DC/ DC converter that uses dual-mode load switching (1x) and dual (2x) conversion to drive white LEDs. AL3157 can drive 3 LEDs at 30mA and the other LED at 210mA. Flash or LED flash, input voltage 2.7V-5.5V, shutdown current less than 1uA, mainly used in smart torch phone LED backlight, PDA white LED backlight and backlight + torch lighting.
AL3157 Application:
• Smart Touch Phone LED Backlighting
• PDA White LED backlighting
• Backlighting + Torch light
Figure 1. AL3157 functional block diagram
Figure 2. AL3157 typical application circuit diagram
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