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DS-RS9360-01 Aug, 2006

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Absolute Maximum Rating

Parameter

Symbol

Value

Unit

Input Voltage

VIN

-0.3~6

V

Output Voltage

VOUT

-0.3~6

V

Power Dissipation ( QFN-16L 4X4 ) @ 25

2.5

W

Maximum Junction Temperature

125

Lead Temperature

260

Operating Temperature Range

-40 to + 85

Storage Temperature Range

-40 to + 85

HBM ESD

ESD

2000

V

Caution: The absolute maximum ratings are rated values exceeding which the product could suffer physical damage.

These values must therefore not be exceeded under any condition.

Operations

The RS9360 is a high efficiency charge pump white LED driver. It provides 4 channels low drop-out voltage current source to

regulated 4 white LEDs current. For high efficiency, the RS9360 implements x1/x1.5/x2 mode charge pump. An external RSET is

used to set the current of white LED. RS9360 has a input current regulation to reduce the input ripple.

Soft Start

The RS9360 includes a soft start circuit to limit the inrush current at power on and mode switching. Soft start circuit holds the input

sink spike current from VIN.

Mode Decision

senses the output and LED voltage for up/down selection.

Dimming Control

CTRL0, CTRL1 and CTRL2 are used to control the onoff of White LED. When a external PWM signal is connected to the control

pin, brightness of white LED is adjusted by the duty cycle.

LED Current Setting

The current of white LED connected to RS9360 can be set by RSET. Every current flows through the white LED is 440 times

greater than the current of RSET. The white LED can be estimated by following equation:

⎟⎟

⎠

⎞

⎜⎜

⎝

⎛

×

=

SET

ISET

LED

R

V

I

440

Thermal Shutdown

thermal damage. When the chip reaches the shutdown temperature 150℃, the thermal shutdown circuit turns off the chip to

prevent the thermal accumulation in the chip.

Overvoltage Protection

The RS9360 regulates the output voltage by controlling the input current. When the output voltage reaches the designated level,

the RS9360 reduces the input current. And then, the output voltage regulation also serves an over-voltage protection.

Short Circuit Protection

A current limiting circuit is also included in theRS9360 for short circuit protection. Whenever output source a dangerously high

current, the current limiting circuit takes over the output regulation circuit and reduces the output current at an acceptable level.