IS31BL3506A
1.0MHZ BOOST CONVERTER WITH 35V INTERNAL MOSFET SWITCH
January 2014
GENERAL DESCRIPTION
IS31BL3506A 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 0.3V. The IS31BL3506A operates at a constant
switching frequency of 1.0MHz to allow for small
component size. IS31BL3506A 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, SOT-23-6 and DFN-8 (2mm×2mm)
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
-9 LEDs (DFN-8)
-8 LEDs (TSOT-23-6, SOT-23-6)
PWM or DC voltage dimming
Frequency of PWM is 500Hz ~ 500kHz
1.0MHz high speed switching frequency
300mV feedback voltage
Integrated high power MOSFET
Over voltage protection
-40°C ~ +85°C working temperature range
TSOT-23-6, SOT-23-6 and DFN-8 (2mm×2mm)
package
APPLICATIONS
TYPICAL APPLICATION CIRCUIT
Small LCD Backlights
Notebook PC
GPS
Figure 1
Constant current white LED driver using PWM at the EN pin to control intensity
Note 1:
C
OUT
must be rated for 50V. Smaller values of output capacitance will cause the LED current ripple to increase.
Note 2:
The resistor R
EST
should be placed as close as possible to the FB pin to prevent the EMI.
Note 3:
Because of the different packages, V
OVP
is not the same (Page 6). 9 LEDs can be driven by DFN-8 package and 8 LEDs can be driven
by TSOT-23-6 and SOT-23-6 package most.
Note 4:
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. C, 01/09/2014
1
IS31BL3506A
PIN CONFIGURATION
Package
Pin Configurations (Top View)
LX
TSOT-23-6
SOT-23-6
1
2
3
6
5
4
VCC
OUT
EN
GND
FB
DFN-8
PIN DESCRIPTION
No.
TSOT-23-6
SOT-23-6
1
2
3
4
5
6
-
-
-
Pin
DFN-8
8
6
5
4
3
2
7
1
LX
GND
FB
EN
OUT
VCC
NC
PGND
Thermal Pad
Switch input, connect to the inductor.
Ground.
Feedback input pin.
Device enable pin, active high.
Output voltage sense pin for over voltage
protection.
Supply voltage input pin.
No connection.
Power ground. Connect independently.
Connect to GND.
Description
Integrated Silicon Solution, Inc. – www.issi.com
Rev. C, 01/09/2014
4
IS31BL3506A
ORDERING INFORMATION
Industrial Range: -40°C to +85°C
Order Part No.
IS31BL3506A-TTLS2-TR
IS31BL3506A-STLS2-TR
IS31BL3506A-DLS2-TR
Package
TSOT-23-6, Lead-free
SOT-23-6, Lead-free
DFN-8, Lead-free
3000
QTY/Reel
Copyright © 2014 Integrated Silicon Solution, Inc. All rights reserved. ISSI reserves the right to make changes to this specification and its products at any
time without notice. ISSI assumes no liability arising out of the application or use of any information, products or services described herein. Customers are
advised to obtain the latest version of this device specification before relying on any published information and before placing orders for products.
Integrated Silicon Solution, Inc. does not recommend the use of any of its products in life support applications where the failure or malfunction of the
product can reasonably be expected to cause failure of the life support system or to significantly affect its safety or effectiveness. Products are not
authorized for use in such applications unless Integrated Silicon Solution, Inc. receives written assurance to its satisfaction, that:
a.) the risk of injury or damage has been minimized;
b.) the user assume all such risks; and
c.) potential liability of Integrated Silicon Solution, Inc is adequately protected under the circumstances
Integrated Silicon Solution, Inc. – www.issi.com
Rev. C, 01/09/2014
5
51单片机
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