DatasheetsPDF.com

BOOST CONVERTER. IS31LT3505 Datasheet

DatasheetsPDF.com

BOOST CONVERTER. IS31LT3505 Datasheet






IS31LT3505 CONVERTER. Datasheet pdf. Equivalent




IS31LT3505 CONVERTER. Datasheet pdf. Equivalent





Part

IS31LT3505

Description

1.0MHZ BOOST CONVERTER



Feature


IS31LT3505 1.0MHZ BOOST CONVERTER WITH 3 5V INTERNAL NMOS OCTOBER 2011 DESCRIPTI ON The IS31LT3505 is a constant current step-up converter with internal NMOS. The step-up converter topology allows s eries connection of the white LEDs so t he LED currents are identical for unifo rm brightness as well as constant outpu t voltage to drive other devices. The o utput current of e.
Manufacture

ISSI

Datasheet
Download IS31LT3505 Datasheet


ISSI IS31LT3505

IS31LT3505; ach channel can be set by an external re sistor and dimming the brightness of LE Ds with the PWM signal or DC voltage. T he IS31LT3505 operates with a switching frequency up to 1 MHz. A low 0.3V feed back voltage minimizes power loss in th e current setting resistor for better e fficiency. With OVP circuit, the chip a nd the system can be safe even if the l oad is not connect.


ISSI IS31LT3505

ed. IS31LT3505 is available in MSOP-10. It operates from 6V to 30V over the tem perature range of -40°C to +85°C. FEA TURES 6V to 30V supply voltage High e fficiency: 90 % typical PWM dimming co ntrol Fast 1.0MHz switching frequency Internal high power 35V NMOS Internal soft start Adjustable LED Open Protec tion Over-temperature protection MSOP -10 APPLICATIONS TV.


ISSI IS31LT3505

monitor backlighting PDA, handheld com puter GPS receiver TYPICAL APPLICATIO N CIRCUIT L1 10μ H 300Ω 100kΩ D1 (Sc hottky,ss26) 6.0V~30V 4 9 EN VDD LX OVP VP 10 http://www.DataSheet4U.net/ R1 6 2 C3 1 μF R2 C OUT 22μ F C I N 22μ F C1 1μF IS31LT3505 C2 1μF 10nF 10 μF 1, 3, 5 GND FB 7 R SE T Figure 1 Application Circuit (Constan t Current to Drive White LE.

Part

IS31LT3505

Description

1.0MHZ BOOST CONVERTER



Feature


IS31LT3505 1.0MHZ BOOST CONVERTER WITH 3 5V INTERNAL NMOS OCTOBER 2011 DESCRIPTI ON The IS31LT3505 is a constant current step-up converter with internal NMOS. The step-up converter topology allows s eries connection of the white LEDs so t he LED currents are identical for unifo rm brightness as well as constant outpu t voltage to drive other devices. The o utput current of e.
Manufacture

ISSI

Datasheet
Download IS31LT3505 Datasheet




 IS31LT3505
IS31LT3505
1.0MHZ BOOST CONVERTER WITH 35V INTERNAL NMOS
OCTOBER 2011
DESCRIPTION
The IS31LT3505 is a constant current step-up
converter with internal NMOS. The step-up converter
topology allows series connection of the white LEDs
so the LED currents are identical for uniform
brightness as well as constant output voltage to drive
other devices. The output current of each channel
can be set by an external resistor and dimming the
brightness of LEDs with the PWM signal or DC
voltage. The IS31LT3505 operates with a switching
frequency up to 1 MHz. A low 0.3V feedback voltage
minimizes power loss in the current setting resistor
for better efficiency. With OVP circuit, the chip and
the system can be safe even if the load is not
connected.
IS31LT3505 is available in MSOP-10. It operates
from 6V to 30V over the temperature range of -40°C
to +85°C.
FEATURES
6V to 30V supply voltage
High efficiency: 90 % typical
PWM dimming control
Fast 1.0MHz switching frequency
Internal high power 35V NMOS
Internal soft start
Adjustable LED Open Protection
Over-temperature protection
MSOP-10
APPLICATIONS
TV monitor backlighting
PDA, handheld computer
GPS receiver
TYPICAL APPLICATION CIRCUIT
6.0V~30V
300Ω 100kΩ
L1
10μ H
D1
(Scho ttky , s s2 6)
CIN C1
22μ F 1μF
C2
1μF
4
EN
LX
10
http://www.DataSheet4U.net/
9
VDD
OVP
IS31LT3505
VP
6
2
10nF
10μF
1, 3, 5
GND
7
FB
R1
C3
1μF
R2
C OU T
22μ F
RSET
Figure 1 Application Circuit (Constant Current to Drive White LEDs)
 
 
 
 
 
 
Copyright © 2011 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. A, 09/01/2011
1
datasheet pdf - http://www.DataSheet4U.net/




 IS31LT3505
IS31LT3505
PIN CONFIGURATION
Package
Pin Configuration (Top View)
MSOP-10
PGND
VP
AGND
EN
AGND
1
2
3
4
5
10 LX
9 VDD
8 NC
7 FB
6 OVP
PIN DESCRIPTION
Pin Name I/O
1 PGND -
3,5 GND -
2 VP I/O
4 EN I
6
OVP
I
7 FB I
8 NC -
9
VDD
-
10 LX O
Thermal
Pad
-
Description
Power ground.
Ground.
Internal 5V regulator. A power supply for the internal NMOS
gate driver and the internal control circuitry.
Enable control input. Do not let this pin floating.
Over-voltage protection of output.
Feedback voltage of output.
No connection, must floating. h t t p : / / w w w . D a t a S h e e t 4 U . n e t /
Supply voltage.
The drain of the internal NMOS.
Connect to Ground.
ORDERING INFORMATION
INDUSTRIAL RANGE: -40°C TO +85°C
Order Part No.
Package
IS31LT3505-SLS2-TR MSOP-10, Lead-free
QTY/Reel
2500
Integrated Silicon Solution, Inc. – www.issi.com
Rev. A, 09/01/2011
2
datasheet




 IS31LT3505
IS31LT3505
ABSOLUTE MAXIMUM RATINGS
Parameter
Value
Supply voltage, VDD
Voltage at LX pin
-0.3V ~ +6.0V
-0.3V ~ +40V
All other pins
-0.3V ~ +6.0V
Operate temperature range
-40°C ~ +85°C
Storage temperature range
-65°C ~ +150°C
Junction temperature range
-40°C ~ +150°C
Lead temperature (Soldering, 10s)
260°C
RJA
ESD HBM
60°C/W
4kV
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only
and functional operation of the device at these or any other condition beyond those indicated in the operational sections of the specifications is
not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
TA = -40°C ~ +85°C, VDD = 12V (unless otherwise noted), Typical values are at TA = 25°C.
Symbol
Parameter
Condition
Min. Typ.
VDD
UVLO
UVLO
IDD
ISD
VP
VEN ON
VEN OFF
Fosc
DMAX
RDS_ON
ISW_LK
ISW_LIMIT
VOVP_TH
VFB
TOTP
TOTP-HYS
Supply voltage
Undervoltage threshold
Undervoltage threshold
hysteresis
Supply current
Shutdown current
Internal regulator
EN on threshold
EN off threshold
Operation frequency
Maximum duty cycle
Internal NMOS on-resistance
Internal NMOS leakage current
Internal NMOS current limit
Over voltage threshold
Feedback voltage
Over temperature threshold
Over temperature threshold
hysteresis
VP falling
Continuous switching
No switching
VEN = 0V
http://www.DataSheet4U.net/
6V<VDD<30V, CVP=10µF
VEN rising
VEN falling
VSW = 35V
Duty = 90%
6
2.9
100
2
1.1
15
4.5 5
1.4
1
90
0.8
1.8
0.285
2.1
0.9
0.3
150
50
Max.
30
5.5
0.4
1.2
1
2.4
0.315
Unit
V
V
mV
mA
μA
V
V
V
MHz
%
μA
A
V
V
°C
°C
Integrated Silicon Solution, Inc. – www.issi.com
Rev. A, 09/01/2011
3
datasheet pdf - http://www.DataSheet4U.net/



Recommended third-party IS31LT3505 Datasheet






@ 2014 :: Datasheetspdf.com :: Semiconductors datasheet search & download site (Privacy Policy & Contact)