LED

IZ1937 Datasheet – White LED Step-Up Converter – Integral

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Part Number: IZ1937

Description

White LED Step-Up Converter

(Functional equvalent of LT1937 Linear Technology Corporation)

Manufacturer:  Integral

Image:
IZ1937 pinout

Features

• Internally determined LED current
• High Efficiency: 84% Typical
• Drives Up to 4 LEDs from a 3.2V Supply
• Drives Up to 6 LEDs from a 5V Supply
• 36V rugged bipolar switch
• Fast 1.2MHz switching frequency
• Uses tiny 1mm Tall Inductors
• Requires only 0.22uF output capacitor

IZ1937 datasheet

Description

The IZ1937 is a step-up DC/DC converter specifically designed to drive white LEDs with a constant current. The device can drive two, three or four LEDs in series from a Li-Ion battery. Series connection of the LEDs provides identical LED currents resulting in uniform brightness and eliminating the need for ballast resistors. The IZ1937 operates at 1.2MHz, allowing the use of tiny external components.The output capacitor can be as small as 0.22uF, saving space and cost versus alternative solutions.

A low 95mV feedback voltage minimizes power loss in the current setting resistor for bette efficiency.
The device can used in mobile phones, PDAs, Handheld Computers, calculators, digital cameras, MP3-players, GPS-receivers.

IZ1937 Datasheet


 

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CS1694 Datasheet PDF – Dynamic LED Controller – Semico

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Part Number: CS1694

Function: Dynamic LED Controller / Driver circuit

Package: SOP28

Manufacturer: Semico

Pinouts:
CS1694 datasheet

Description

The CS1694 is a dynamic LED control/driver with multiple display modes 6×11 or 7×10 with 8 levels of brightness inside Control with a key scan function to scan a 10×2 keyboard matrix circuit containing a 14×8 display RAM and A 5 × 6 button data RAM as an ideal peripheral component of the MCU with a serial port Din that can be directly connected to the MCU & Dout Stb Clk The CS1694 is based on the CS1684 package and is based on the CS1684 circuit. Din and Dout are bonded together. Key3 and Seg11 are not bonded together and other functions are the same as CS1684 This circuit is mainly used as a dynamic LED control / driver and also has the purpose of button scanning between the microcontroller and the dynamic LED screen. Ideal components can be used on DVD VCD amplifiers.

Features

1. Using low-power CMOS process technology
2. Variety of display modes 6 Grids × 11 Segs or 7 Grids × 10 Segs
3. Button keyboard scan function 10 × 2 matrix
4. With 8 brightness adjustment function
5. With a serial interface directly with the MCU clock phase data input data output enable signal

 

Application Circuit

components

Other data sheets are available within the file: S1694, 1694

CS1694 Datasheet PDF Download


CS1694 pdf