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IS31BL3506B fiches techniques PDF

ISSI - 1.0MHZ BOOST CONVERTER

Numéro de référence IS31BL3506B
Description 1.0MHZ BOOST CONVERTER
Fabricant ISSI 
Logo ISSI 





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IS31BL3506B fiche technique
IS31BL3506B
1.0MHZ BOOST CONVERTER WITH 35V INTERNAL MOSFET SWITCH
April 2013
GENERAL DESCRIPTION
IS31BL3506B is a boost converter featuring an
integrated MOSFET switch designed for driving series
strings of LED or other device. Input operating voltage
range is 2.7V~5.5V. The device regulates the LED load
current is set using an external, low value sensing
resistor. The device adjusts the PWM duty cycle of the
switch to maintain the voltage at the FB pin at a value
of 0.2V. The IS31BL3506B operates at a constant
switching frequency of 1.0MHz to allow for small
component size. IS31BL3506B features an over
voltage shutdown pin which prevents the output
voltage from exceeding 35V (typ.) in the case of an
open circuit condition. The device is offered in a tiny
TSOT-23-6 and SOT-23-6 package and a temperature
rating from -40°C ~ +85°C.
FEATURES
Supply voltage: 2.7V~5.5V
Built-in soft start
Drive series strings of 8 LEDs
PWM or DC voltage dimming
Frequency of PWM is 500Hz ~ 500kHz
1.0MHz high speed switching frequency
200mV feedback voltage
Integrated high power MOSFET
Over voltage protection
-40°C ~ +85°C working temperature range
TSOT-23-6 and SOT-23-6 package
APPLICATIONS
Small LCD Backlights
Notebook PC
GPS
TYPICAL APPLICATION CIRCUIT
Figure 1 Constant current white LED driver using PWM at the EN pin to control intensity
Note 1: COUT must be rated for 50V. Smaller values of output capacitance will cause the LED current ripple to increase.
Note 2: The resistor REST should be placed as close as possible to the FB pin to prevent the EMI.
Note 3: The high level of PWM signal for EN pin should last at least 200ns when power on, or the IC won’t start up.
Integrated Silicon Solution, Inc. – www.issi.com
Rev. A, 04/15/2013
1

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