TB62736FUG

Features:

• Brightness control function : LED forward current 25~100%
• Maximum output voltage : over 24V
• LED current values controlled by external resistance : 20mA (typ.) @ RSENS=16
• Output power : 400 mW
• Package : SSOP6-P-0.95 (SOT23-6)
• High efficiency : maximum 87% (when used with components as recommended herein)
• Thermal Shutdown Function incorporated : 150 degree (typ.)


Pinout




Specifications

Characteristics	Symbol	Ratings	Unit
Power supply voltage	VIN	-0.3 to 6.0	V
Input voltage	VSHDN	-0.3 to VCC + 0.3	V
Switching pin voltage	VO (SW)	-0.3 to 24	V
Switching pin current	IO (SW)	380	mA
Power Dissipation	PD	0.41 (IC only)	W
		0.47 (IC mounted on PCB)(Note)
Thermal resistance	R th (j-a) 1	300 (IC only)	/W
	R th (j-a) 2	260 (IC mounted on PCB)
Operating temperature range	Topr	-40 to 85
Storage temperature	Tstg	-55 to 150
Maximum junction temperature	Tj	125

Note: Power dissipation is reduced by 3.8mW/ from the maximum rating for every 1 exceeding the ambient temperature of 25 (when the IC is mounted on a PCB).


Description

The TB62736FUG is a high efficiency step-up type DC/DC converter that is designed especially for use as a constant current driver of white LEDs.

It is possible to drive 2 - 6 white LEDs connected in series using a lithium-ion battery. (Typ. 4 White LEDs)

This IC incorporates an N-ch-MOS transistor required for switching of an external inductor.

The forward current of the LEDs can be controlled by an external resistor. An analog voltage input and a pulse input system (PWM) can be used as a brightness control function.

The switching frequency is fixed at around 1.1 MHz. This IC is best suited for use as a driver of white LED back lighting in color LCDs in PDAs, cellular phones and handy terminal devices.