IZ1937 Datasheet – White LED Step-Up Converter – Integral

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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SX1308 Datasheet – 1.2MHz, 2A Step Up Converter – Suosemi

Part Number: SX1308

Function : High Efficiency 1.2MHz, 2A Step Up Converter

Manufacturer: Suosemi Corporation

Package:  Small  6-pin SOT-23 Type

Image:

SX1308 image

Pinout:

SX1308 datasheet
General Description

The SX1308 is a constant frequency, 6-pin SOT23 current mode step-up converter intended for small, low power applications. The  SX1308  switches at 1.2MHz and allows the use of tiny, low cost capacitors and inductors 2mm or less in height. Internal soft-start results in small inrush current and extends battery life.
The SX1308  features  automatic shifting to pulse frequency modulation mode at light loads. The SX1308  includes under-voltage lockout, current limiting, and thermal overload protection to prevent damage in the event of an output overload.

SX1308 Circuit

SX1308 circuit

SX1308 Datasheet

 

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