器件名称: YB1314
功能描述: 120mA 1x/1.5x/2x Charge Pump for White LED
文件大小: 106.45KB 共1页
简 介:Preliminary YB1314
120mA 1x/1.5x/2x Charge Pump for White LED
Description
The YB1314 charge pump drive up to 4 white LEDs with regulated constant current. The devices can be used to produce current levels up to 30mA for each output from a 2.7V to 5.5V input. The 1MHz fix-frequency switching allows for tiny external components, and the regulation scheme is optimized to ensure low EMI and low input ripple. Serial data input control is used to enable, disable and set the LED drive current for a 32 level logarithmic scale LED brightness control. Internal softstart circuitry effectively reduces the in-rush current. YB1314 also provides short circuit protection, over-temperature protecttion and over-voltage protection. In shutdown mode, the shutdown current is less than 1A. YB1314 is available in a QFN-16 3*3 package.
Features
Input Range : 2.7V to 5.5V Drives up to 4 LEDs at 30mA Each 1MHz Internal Oscillator Thermal Protection Shutdown Output Short-circuit Current Limit and
Overvoltage Protection Undervoltage Lockout With Hysteresis Automatic Soft-Start Reduces In-Rush Current Three Charge Pump Mode 1x/1.5x/2x
3mm x 3mm QFN package
Applications
White LED Backlighting Handheld PCs and PDAs Mobile Phone
Typical Application Circuit
VIN VOUT
C1+ C1C2+
C1 1F
VBATTERY
+ -
CIN 1F
COUT 2.2F
YB1314
C2D1 D2 D3
C2 1F
EN/SET
EN/SET GND
D4
D4
D3
D2
D1
Figure 1. Typical application circuit YB1314 MRev.0.1 www.yobon.com.tw 1
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