With the advancement of LED manufacturing technology and battery technology, the highest capacity lithium ion (Li+) battery energy density can reach 750kJ / kg; nickel-hydrogen (NiMH) battery energy density is slightly lower, about 200kJ / kg (and The energy density of gasoline is 44 MJ/kg). The terminal voltage of a single-cell Li+ battery is about 3.7V. In order to directly drive multiple LEDs in series, multiple cells need to be connected in series, but this will bring design problems such as power distribution. Users also prefer single-cell batteries. Power supply scheme. When using a high-capacity, single-cell Li+ battery to drive a high-efficiency LED light source, the power conversion problem needs to be solved because the battery voltage is only 3V to 4V. This application note describes the Maxim MAX16834 HB LED driver's solution for generating HB LED string drivers from low voltage power supplies. Inefficient when driving LED strings in continuous boost mode Take the common boost configuration topology as an example, for example: the standard MAX16834 HB LED Driver Evaluation Board (EV) MAX16834EVKIT (Figure 1). Figure 1. Common HB LED driver boost configuration Boost converter powers both LED strings and FETs The MAX16834 is a versatile HB LED driver that allows dimming through analog and pulse width modulation (PWM). The device implements boost, boost/buck, SEPIC, and high-side buck topologies. In addition to driving an n-channel power MOSFET switch controlled by a switching controller, the device can also drive an n-channel PWM dimmer switch for LED PWM dimming. The device integrates all the circuitry needed for a wide range of dimming, fixed frequency HB LED drivers. gaming headset gaming headset Shenzhen Linx Technology Co., Ltd. , https://www.linxheadphone.com