TB62756FUG

Features:

• Can drive 2-6 white LEDs connected series
• Variable LED Current I_F is set with a external resistor : 20 mA (Typ.) @R_SENS = 16
• Output Power : Available for 400mW LED loading
• High Efficiency : 87% @Maximum (Using recommended external parts: Typ. 4LEDs)
• IC Package : SSOP6-P-0.95 (SOT23-6)
• Switching Frequency : 1.1 MHz (Typ.)


Pinout




Specifications

Characteristics	Symbol	Ratings	Unit
Power supply voltage	VIN	−0.3 to 6.0	V
Input voltage	VSHDN	−0.3 to VIN + 0.3(Note3)	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)(Note4)
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	150

Note3: However, do not exceed 6V.
Note4: Power dissipation is reduced by 3.8mW/°C from the maximum rating for every 1 exceeding the ambient temperature of 25°C (when the IC is mounted on a PCB).


Description

The TB62756FUG 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.

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

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

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.

This device is Pb-free product.