Linear Technology Corporation has introduced the LTC3452, a synchronous buck-boost DC/DC converter that optimizes the use of a single-cell Li-Ion battery to drive two sets of white LEDs . The LTC3452 can drive up to five LEDs in parallel, and each LED has a drive current of up to 25mA, which provides backlighting for the LCD display. The device also drives two LEDs with a drive current of up to 200mA (or one LED and a drive current of 400mA) for camera flash applications. The LTC3452's synchronous buck-boost topology provides up to 90% efficiency over the entire available Li-Ion battery voltage range of 2.7V to 4.2V, maximizing battery run time. The 4mm x 4mm QFN package and constant 1MHz switching frequency ensure a very compact solution footprint for most handheld applications. Depending on the input voltage and the highest forward voltage drop of the LED, the LTC3452 can operate in either synchronous buck, synchronous buck, or buck-boost mode. Optimal efficiency is achieved by detecting which LED requires the highest forward voltage drop at the programming current and adjusting the common output rail to achieve the lowest differential pressure. The maximum LED current for each display can be programmed with a single external resistor. The dual enable pin allows PWM brightness control of the TFT display while a separate on/off control pin is used for the flash output. Other features include: internal soft-start, open/short LED protection and overtemperature protection. Performance summary: High efficiency: ≥ 90% over the entire single-cell lithium battery voltage range
Vibration
speaker:
Vibration
speaker is a kind of speaker unit which is made from vibration principle. It is
also called resonance speaker. Vibration Speakers have no diaphragms and also
called exciters. They drive any solid plane surface they contact and made that surface
sound, so people can have original sound from different materials. Vibration
speakers have a special penetrability which traditional speakers don`t have.
These kind of speakers are mainly used for digital audio speakers, music massage
facilities and music treatment facilities.
Our main vibration speakers include:
1) From
the diameter: we have speakers in diameter of 18mm ~ 44mm.
2) From
the power output, we have speakers of 2W ~ 15W.
FAQ
Q1. What
is the MOQ?
Vibration Speakers Vibration Speaker,Vibration Driver,Vibro Speaker,Vibration Bluetooth Wireless Speaker Shenzhen Xuanda Electronics Co., Ltd , http://www.xdecspeaker.com
Wide VIN range: 2.7V to 5.5V
Independent main display / camera current control
500mA (total) continuous output current
1MHz constant frequency operation internal soft start open/short LED protection
PWM brightness control overheat protection low shutdown current: 6uA
Small heat-resistant enhanced 16-lead (4mm x 4mm) QFN package 
XDEC: 2000pcs for one model.
Q2. What is the delivery lead time?
XDEC: 15 days for normal orders, 10 days for urgent orders.
Q3. What are the payment methods?
XDEC: T/T, PayPal, Western Union, Money Gram.
Q4. Can you offer samples for testing?
XDEC: Yes, we offer free samples.
Q5. How soon can you send samples?
XDEC: We can send samples in 3-5 days.