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Description
The SM8131B00B is a charge pump DC/DC converter designed for IC chips. It is a device that switches between ×1 and ×1.5 automatically. This converter is mainly used to extend battery life by detecting the LED drive current. It can control 1 to 6 lights of white LED that are connected in parallel through 6-channel LED drive current control circuits built-in in it. The LED drive current per channel is set up by external resistor, and by setting up SEL1/SEL2 pins, 6-channel of LED drive current control circuit can be divided to 2-groups, and input signal controlling allows ON/OFF and dimming per group.
Specifications and features
- Automatic charge pump switch between ×1 and ×1.5 according to the detection of the LED drive current, which extends battery life.
- Controlling 1 to 6 lights of white LED connected in parallel.
- Set up LED drive current value by external resistor (5kΩ:5mA/ch, 15kΩ:15mA/ch, 20kΩ:20mA/ch)
- Dividing 6-channel LED drive current control circuit to 2-groups by setting up SEL1/SEL2 pins (L/L = 6:0ch, L/H = 5:1ch, H/L = 4:2ch, H/H = 3:3ch).
- 2-wire input controlling (1-wire input controlling when SEL1/SEL2 pins are set to “LOW”).
- ON/OFF and brightness control by input signal controlling of EN1/EN2 pins.
- Supply voltage range:
- No-load current (IOUT= 0mA): 2.7 to 4.6V
- Load current (IOUT= 120mA): 3.3 to 4.6V
- Maximum output voltage: 4.2V (typ)
- Maximum output current: 120mA (typ)
- Quiescent current:
- Not-switching (×1 mode): 0.7mA (typ)
- Switching (×1.5 mode): 2.0mA (typ)
- Standby current (Power save mode): 0.01µA (typ)
- Operating frequency (×1.5 mode): 750kHz (typ)
- LED drive current accuracy (RSET = 20kΩ) :20mA ± 3%
- Input signal frequency for dimming (Duty = 50%) :150kHz (max)
- Package:20-pin QFN
Application Scenarios
This device is mainly used for IC chips.
Comparison
Advantages- The device automatically switches between ×1 and ×1.5 to extend battery life.
- The device has 6-channel LED drive current control circuits built-in for controlling 1 to 6 lights of white LED connected in parallel.
- It can control the LED drive current per channel by an external resistor and can be divided into 2-groups by setting up SEL1/SEL2 pins.
- The device has 2-wire input controlling and ON/OFF and brightness control by input signal controlling of EN1/EN2 pins.
- It has a low standby current (Power save mode): 0.01µA (typ).
Disadvantages- The device's input signal frequency for dimming is limited to 150kHz (max).
- The maximum output current is 120mA (typ), which may not be sufficient for certain applications.
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Datasheet
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Shopping guide
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Additional Information
- Datasheet: Download SM8131B00B
- Chipdatas Part: CD88-SM8131B00B
- Warehouse: China, Hong Kong
- Dispatch: Within 24 hours
- Free Shipping: Yes
- Prority Shipping: Yes, 3-5 days
- Last Updated: 2024/09/28 19:25 +0800
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- Full Refund if you don't receive your order
- Full or Partial Refund , If the item is not as described
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