Datasheet, Rev. 1.1, January 2011
ILD4180
1.8A DC/DC Step-Down Converter
LED Driver for Industrial Applications
1.8A DC/DC Step-Down Converter
ILD4180
1
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Overview
Wide Input Voltage Range from 4.75V to 45V
Constant Current or Constant Voltage Regulation
Drives LEDs in Buck Topology
Very low shutdown current consumption (typ. 100nA)
370 kHz switching frequency
PWM Dimming
Integrated power-switch (output current up to 1.8A)
Internal Soft-Start function
± 2% output current tolerance (± 4% for full load current range)
Small thermally enhanced exposed heatslug package
Over Temperature Shutdown
Suited for industrial applications: Tj = -40 °C to +125 °C
Green Product (RoHS Compliant)
PG-DSO-8-27
Description
The ILD4180 is a smart LED buck converter with an integrated power-switch, capable of driving up to 1.8A load
current with excellent line and load regulation. The main function of this device is to step-down the input voltage
and regulating a constant LED current. The constant current regulation is especially beneficial for LED color
accuracy and longer lifetime. The ILD4180 also has a PWM input which can be used for LED dimming. The
switching frequency of 370kHz allows to use small and inexpensive passive components. An Enable function is
implemented to reduce the shut-down current consumption to typ. 100nA. This IC provides protection functions
such as current limitation and overtemperature shutdown. The integrated soft-start feature avoids a current and
voltage overshot at the output during start-up of the device.
Applications
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LED Controller for industrial applications
Universal Constant Current and Voltage Source
General Illumination e.g. Halogen Replacement
Residential Architectural and Industrial Commercial Lighting for in- and outdoor
Signal and Marker Lights for Orientation or Navigation (e.g. steps, exit ways, etc.)
For automotive and transportation applications, please refer to the Infineon® Auto LED products.
Type
ILD4180
Datasheet
Package
PG-DSO-8-27
2
Marking
ILD4180
Rev. 1.1, 20011-01-25
ILD4180
Block Diagram
2
Block Diagram
EN
VS
7
8
Enable
Charge Pump
Over
Temperature
Shutdown
Feedforward
COMP
3
5
BDS
Buck
Converter
Oscillator
6
BUO
PWMI
1
4
FB
Bandgap
Reference
Soft start ramp
generator
ILD5085
ILD4180
2
GND
Figure 1
Block Diagram
Datasheet
3
Rev. 1.1, 20011-01-25
ILD4180
Pin Configuration
3
3.1
Pin Configuration
Pin Assignment
PWMI
GND
COMP
FB
1
2
3
ILD4180
ILD5085
8
7
6
VS
EN
BUO
BDS
EP
4
S08 _ Pinout _ ILD5085 .vsd
5
Figure 2
Pin Configuration
3.2
Pin
1
2
3
Pin Definitions and Functions
Symbol Function
PWMI
GND
PWM Input for;
Provides LED dimming option. If not used connect to VS.
Ground;
Connect to system ground.
Compensation Input;
Frequency compensation for regulation loop stability.
Connect R and C network to pin for stability.
Feedback Input;
Connect a defined power resistor (RFB=0.6V/ILED) to get the needed LED output current.
For adjustable output voltages connect this pin via a voltage divider in parallel to the output
capacitor.
Buck Driver Supply Input;
Connect the bootstrap capacitor between this pin and pin BUO.
Buck Switch Output;
Source of the integrated power-switch. Connect directly to the cathode of external freewheeling
diode and the buck circuit inductance.
Enable Input;
Apply logic high signal to enable the device. A pull down resistor is integrated.
Supply Voltage Input;
Connect to supply voltage source.
Exposed Pad;
Connect to heatsink area and GND by low inductance wiring.
COMP
4
FB
5
6
BDS
BUO
7
8
EP
EN
VS
Datasheet
4
Rev. 1.1, 20011-01-25
ILD4180
General Product Characteristics
4
4.1
General Product Characteristics
Absolute Maximum Ratings
Absolute Maximum Ratings
1)
T
j
= -40
⋅C
to +125
⋅C;
all voltages with respect to ground (unless otherwise specified)
Pos.
Voltages
4.1.1
4.1.2
4.1.3
4.1.4
4.1.5
4.1.6
4.1.7
4.1.8
PWMI (Pin1)
PWM Input
COMP (Pin 3)
Compensation Input
FB (Pin 4)
Feedback Input
BDS (Pin 5)
Buck Driver Supply Input
BUO (Pin 6)
Buck Switch Output
EN (Pin 7)
Enable Input
VS (Pin 8)
Supply Voltage Input
Junction Temperature
Storage Temperature
ESD Resistivity all Pins to GND
Parameter
Symbol
Limit Values
Min.
Max.
45
5.5
6.2
5.5
V
V
V
V
V
V
V
V
–
–
Unit
Conditions
V
PWMI
V
COMP
V
FB
V
BDS
V
BUO
V
EN
V
S
-0.3
-0.3
-0.3
t
< 10s
2)
–
–
–
–
–
V
BUO
- 0.3
-2.0
-40
-0.3
V
BUO
+ 5.5
V
VS
+ 0.3
45
45
Temperatures
4.1.9
4.1.10
4.1.11
T
j
T
stg
V
ESD
-40
-55
-2
150
150
2
°C
°C
kV
–
–
HBM
3)
ESD Susceptibility
1) Not subject to production test, specified by design
2) Exposure to those absolute maximum ratings for extended periods of time (t > 10s) may affect device reliability
3) ESD susceptibility HBM according to EIA/JESD 22-A 114B (1.5kΩ,100pF).
Note: Stresses above the ones listed here may cause permanent damage to the device. Exposure to absolute
maximum rating conditions for extended periods may affect device reliability.
Note: Integrated protection functions are designed to prevent IC destruction under fault conditions described in the
data sheet. Fault conditions are considered as “outside” normal operating range. Protection functions are
not designed for continuous repetitive operation.
Datasheet
5
Rev. 1.1, 20011-01-25
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