IS32BL3552 LED DRIVER Datasheet

IS32BL3552 Datasheet, PDF, Equivalent


Part Number

IS32BL3552

Description

BOOST TYPE LED DRIVER

Manufacture

ISSI

Total Page 13 Pages
Datasheet
Download IS32BL3552 Datasheet


IS32BL3552
IS32BL3552
BOOST TYPE LED DRIVER WITH 2-CHANNEL CURRENT SOURCE
Preliminary Information
August 2014
GENERAL DESCRIPTION
The IS32BL3552 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 IS32BL3552 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 40mA to 360mA. 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 IS32BL3552 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 IS32BL3552 is available in a thermally enhanced
eTSSOP-16 package.
FEATURES
Input voltage range: 4.5V to 33V
2-Channel LED current sinks, 360mA per string
LED current adjustable from 40mA to 360mA
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, 07/30/2014
1

IS32BL3552
IS32BL3552
PIN CONFIGURATION
Package
Pin Configuration (Top View)
eTSSOP-16
PIN DESCRIPTION
No. Pin
1 RT
2 EN
3 CS
4 OUT
5 VCC
6
7
8
9
10
11,14
13
12
15
VIN
STATUS
COMP
DIM
CH1
NC
CH2
GND
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 (up to 360mA). If unused leave the pin open unconnected.
No connection.
LED current sink 2 (up to 360mA). If unused leave the pin open unconnected.
Ground. Connect all grounds at a single point.
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, 07/30/2014
2


Features IS32BL3552 BOOST TYPE LED DRIVER WITH 2 -CHANNEL CURRENT SOURCE Preliminary In formation August 2014 GENERAL DESCRIPT ION The IS32BL3552 is a white LED drive r for backlight applications based on a highly efficient boost controller oper ating over a wide input voltage range o f 4.5V to 33V. The IS32BL3552 contains four regulated current sources with 1.5 % (Typ.) current matching between strin gs for a uniform LED brightness. Each c urrent source can be programmed via an external resistor to drive from 40mA to 360mA. A fast slew rate current source allows high frequency and narrow pulse width dimming signals to achieve a ver y high contrast ratio. The device opera ting frequency can be adjusted from 0.1 MHz to 1MHz. The IS32BL3552 has safety protection features to prevent damage d uring fault conditions. Protection feat ures include an internal soft-start cir cuit to prevent a high inrush current d uring startup, open/short LED protectio n to automatically disable a faulty current source, over temper.
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