IS32BL3554 LED DRIVER Datasheet

IS32BL3554 Datasheet, PDF, Equivalent


Part Number

IS32BL3554

Description

BOOST TYPE LED DRIVER

Manufacture

ISSI

Total Page 13 Pages
Datasheet
Download IS32BL3554 Datasheet


IS32BL3554
IS32BL3554
BOOST TYPE LED DRIVER WITH 4-CHANNEL CURRENT SOURCE
Preliminary Information
July 2014
GENERAL DESCRIPTION
The IS32BL3554 is a white LED driver for backlight
applications based on a highly efficient boost
controller operating over a wide input voltage range of
4.5V to 33V.
The IS32BL3554 contains four regulated current
sources with 1.5% (Typ.) current matching between
strings for a uniform LED brightness. Each current
source can be programmed via an external resistor to
drive from 20mA to 180mA. A fast slew rate current
source allows high frequency and narrow pulse width
dimming signals to achieve a very high contrast ratio.
The device operating frequency can be adjusted from
0.1MHz to 1MHz.
The IS32BL3554 has safety protection features to
prevent damage during fault conditions. Protection
features include an internal soft-start circuit to prevent
a high inrush current during startup, open/short LED
protection to automatically disable a faulty current
source, over temperature protection (OTP),
cycle-by-cycle current limit, under voltage lockout
(UVLO), programmable OVP, VOUT short / Schottky
diode open protection and Schottky Diode
short-circuit protection.
The IS32BL3554 is available in a thermally enhanced
eTSSOP-16 package.
FEATURES
Input voltage range: 4.5V to 33V
4-Channel LED current sinks, 180mA per string
LED current adjustable from 20mA to 180mA
String-to-string current matching accuracy: 1.5%
Adjustable operating frequency: 100kHz to 1MHz
External PWM dimming
High contrast ratio
Less than 3µA shutdown current
Programmable soft-start
Built-in protection features
• OCP, OTP, UVLO
• Open/short LED protection
• Programmable OVP
• Schottky Diode/inductor short-circuit protection
Automotive AEC-Q100 qualified
APPLICATIONS
Automotive Lighting
LCD Monitor/TV
LCD Display Module
TYPICAL APPLICATION CIRCUIT
Figure 1 Typical Application Circuit
Integrated Silicon Solution, Inc. – www.issi.com
Rev. 0B, 07/23/2014
1

IS32BL3554
IS32BL3554
PIN CONFIGURATION
Package
Pin Configuration (Top View)
eTSSOP-16
PIN DESCRIPTION
No. Pin
1 RT
2 EN
3 CS
4 OUT
5 VCC
6 VIN
7 STATUS
8 COMP
9 DIM
10,11
12
13,14
CH1,CH2
GND
CH3,CH4
15 ISET
16 OVP
Thermal Pad
Description
A resistor value to ground sets the switching frequency from 100kHz to 1MHz.
Enable Input. The IC is Enabled when this pin is above 2.4V. The IC is Disabled
and in Shutdown mode when this pin is below 0.5V. In shutdown mode only a
minimal 3µA current is consumed.
Current Sense Input from the switching converter. A sense resistor from the
source of the external N-MOSFET to GND sets the switching current limit.
Switching N-MOSFET Gate Drive Output. This pin outputs a high voltage
(5V/VCC-0.5V) to drive an external switching N-MOSFET.
5V linear regulator output. Bypass this pin to GND with a ceramic capacitor as
close as possible to the pin.
Supply input (4.5V to 33V). Bypass VIN to GND with a capacitor (typical 10µF)
to keep the DC input voltage constant.
LED operation status will output logic low if a fault is detected.
Soft-start and control loop compensation.
PWM signal input for LED dimming. If dimming is not implemented, connect it
to VCC pin 5.
LED current sink 1 and 2 (up to 180mA). If unused leave the pin open
unconnected.
Ground. Connect all grounds at a single point.
LED current sink 3 and 4 (up to 180mA). If unused leave the pin open
unconnected.
LED Current Adjust Input. Connect a resistor RISET between ISET pin and GND
to set the reference current through each LED string.
Over Voltage Protection pin. Connect a resistor-divider from the switching
converter output to this pin. The OVP comparator reference is internally set to
2.0V. Above 2.0V triggers OVP and shuts down switch power; switch resumes
normal operation when the pin voltage drops below hysteresis voltage.
Connect to GND.
Integrated Silicon Solution, Inc. – www.issi.com
Rev. 0B, 07/23/2014
2


Features IS32BL3554 BOOST TYPE LED DRIVER WITH 4 -CHANNEL CURRENT SOURCE Preliminary In formation July 2014 GENERAL DESCRIPTIO N The IS32BL3554 is a white LED driver for backlight applications based on a h ighly efficient boost controller operat ing over a wide input voltage range of 4.5V to 33V. The IS32BL3554 contains fo ur regulated current sources with 1.5% (Typ.) current matching between strings for a uniform LED brightness. Each cur rent source can be programmed via an ex ternal resistor to drive from 20mA to 1 80mA. A fast slew rate current source a llows high frequency and narrow pulse w idth dimming signals to achieve a very high contrast ratio. The device operati ng frequency can be adjusted from 0.1MH z to 1MHz. The IS32BL3554 has safety pr otection features to prevent damage dur ing fault conditions. Protection featur es include an internal soft-start circu it to prevent a high inrush current dur ing startup, open/short LED protection to automatically disable a faulty current source, over temperat.
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