RT8471 Datasheet PDF - Richtek

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RT8471
Richtek

Part Number RT8471
Description High Brightness LED Driver
Page 15 Pages


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®
RT8471
1.2A/1A, Hysteretic, High Brightness LED Driver with
Internal Switch
General Description
The RT8471 is a high efficiency, continuous mode inductive
step-down converter, designed for driving single or multiple
series connected LEDs from a voltage source higher than
the LED voltage. It operates from an input voltage of 7V to
36V and employs hysteretic control with a high side current
sense resistor to set the constant output current.
The RT8471 includes an output switch and a high side
output current sensing circuit, which uses an external
resistor to set the nominal average output current. LED
brightness control is achieved with PWM dimming from
an analog or PWM input signal.
The RT8471 is available in a small TSOT-23-5 package or
a more thermal efficient SOP-8 (Exposed Pad) and MSOP-
8 (Exposed Pad) packages.
Ordering Information
RT8471
Package Type
J5 : TSOT-23-5
SP : SOP-8 (Exposed Pad-Option 1)
FP : MSOP-8 (Exposed Pad)
Lead Plating System
G : Green (Halogen Free and Pb Free)
(for MSOP-8 (Exposed Pad) and
TSOT-23-5 )
Z : ECO (Ecological Element with
Halogen Free and Pb free)
(for SOP-8 (Exposed Pad) Only)
Note :
Richtek products are :
RoHS compliant and compatible with the current require-
ments of IPC/JEDEC J-STD-020.
Suitable for use in SnPb or Pb-free soldering processes.
Features
7V to 36V Input Voltage Range
Hysteretic Control with High Side Current Sensing
Internal N-MOSFET with 350mΩ Low RDS(ON)
1A Output Current (For TSOT-23-5 Only)
1.2A Output Current (For SOP-8 (Exposed Pad) and
MSOP-8 (Exposed Pad) Only)
Up to 97% Efficiency
Typical ±5% LED Current Accuracy
Analog or PWM Control Signal for LED Dimming
300Hz On-Board Ramp Generator
Input Under Voltage Lockout
Thermal Shutdown Protection
RoHS Compliant and Halogen Free
Applications
Automotive LED Lighting
High Power LED Lighting
Indicator and Emergency Lighting
Architectural Lighting
Low Voltage Industrial Lighting
Signage and Decorative LED Lighting
Marking Information
RT8471GJ5
01=DNN
01= : Product Code
DNN : Date Code
RT8471ZSP
RT8471
ZSPYMDNN
RT8471ZSP : Product Number
YMDNN : Date Code
RT8471GFP
0D=YM
DNN
0D= : Product Code
YMDNN : Date Code
Copyright ©2013 Richtek Technology Corporation. All rights reserved.
DS8471-02 December 2013
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
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RT8471
Pin Configurations
VIN SENSE
54
23
LX GND ADJ
TSOT-23-5
(TOP VIEW)
VIN
SENSE
GND
ADJ
8
27
GND
36
9
45
GND
LX
NC
NC
SOP-8 (Exposed Pad)
SENSE
GND
GND
ADJ
8
2 GND 7
3 96
45
VIN
NC
LX
LX
MSOP-8 (Exposed Pad)
Typical Application Circuit
VIN
7V to 36V
CIN
RT8471
VIN SENSE
RS
optional
ADJ
GND
LX
L
D
Functional Pin Description
TSO T-23-5
1
2
3
4
5
Pin No.
SOP-8
(Exposed Pad)
7
MSOP-8
(Exposed Pad)
5, 6
Pin Name
LX
3, 8,
9 (Exposed Pad)
2, 3,
9 (Exposed Pad)
GND
4 4 ADJ
2 1 SENSE
1 8 VIN
Pin Function
Switch O utput Terminal. Dr ai n of inter nal N-MOSFET.
Ground. The exposed pad must be soldered to a
large PCB and connected to GND for maximum
power dissipation.
Dimming Control Input :
--- Analog signal input for analog PWM dimming.
--- PWM signal input for digital PWM dimming.
Output Current Sense. Sense LED string current with
an external resistor connected between VIN and
SENSE.
Supply Input Voltage.
-- 5, 6
7 NC No Internal Connection.
Copyright ©2013 Richtek Technology Corporation. All rights reserved.
www.richtek.com
2
is a registered trademark of Richtek Technology Corporation.
DS8471-02 December 2013



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Function Block Diagram
VIN
Regulator
Bandgap
UVLO
UVLO
VCC
1.25V
+
-
Ramp Gen.
+ Dimming
ADJ -
UVLO
Dimming
RT8471
SENSE
LX
GND
Copyright ©2013 Richtek Technology Corporation. All rights reserved.
DS8471-02 December 2013
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
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RT8471
Absolute Maximum Ratings (Note 1)
Supply Input Voltage, VIN ------------------------------------------------------------------------------------- 0.3V to 40V
Switch Voltage, LX --------------------------------------------------------------------------------------------- 0.3V to (VIN + 0.7V)
Sense Voltage, SENSE -------------------------------------------------------------------------------------- (VIN 5V) to (VIN + 0.3V)
All Other Pins ----------------------------------------------------------------------------------------------------- 0.3V to 6V
Power Dissipation, PD @ TA = 25°C
TSOT-23-5 (Two-layer PCB) ---------------------------------------------------------------------------------- 0.37W
TSOT-23-5 (Four-layer PCB) --------------------------------------------------------------------------------- 0.43W
SOP-8 (Exposed pad, Two-layer PCB) -------------------------------------------------------------------- 2.35W
SOP-8 (Exposed pad, Four-layer PCB) ------------------------------------------------------------------- 3.26W
MSOP-8 (Exposed pad, Two-layer PCB) ----------------------------------------------------------------- 1.38W
MSOP-8 (Exposed pad, Four-layer PCB) ---------------------------------------------------------------- 2.1W
Package Thermal Resistance (Note 2)
TSOT-23-5, θJA (Two-layer PCB) ---------------------------------------------------------------------------- 264.4°C/W
TSOT-23-5, θJC (Two-layer PCB) ---------------------------------------------------------------------------- 21.8°C/W
TSOT-23-5, θJA (Four-layer PCB) --------------------------------------------------------------------------- 230.6°C/W
TSOT-23-5, θJC (Four-layer PCB) --------------------------------------------------------------------------- 21.8°C/W
SOP-8 (Exposed pad, Two-layer PCB), θJA -------------------------------------------------------------- 42.5°C/W
SOP-8 (Exposed pad, Two-layer PCB), θJC -------------------------------------------------------------- 3.4°C/W
SOP-8 (Exposed pad, Four-layer PCB), θJA ------------------------------------------------------------- 30.6°C/W
SOP-8 (Exposed pad, Four-layer PCB), θJC ------------------------------------------------------------- 3.4°C/W
MSOP-8 (Exposed pad, Two-layer PCB), θJA ----------------------------------------------------------- 72°C/W
MSOP-8 (Exposed pad, Two-layer PCB), θJC ----------------------------------------------------------- 11.9°C/W
MSOP-8 (Exposed pad, Four-layer PCB), θJA ---------------------------------------------------------- 47.4°C/W
MSOP-8 (Exposed pad, Four-layer PCB), θJC ---------------------------------------------------------- 11.9°C/W
Junction Temperature ------------------------------------------------------------------------------------------ 150°C
Lead Temperature (Soldering, 10 sec.) -------------------------------------------------------------------- 260°C
Storage Temperature Range --------------------------------------------------------------------------------- 65°C to 150°C
ESD Susceptibility (Note 3)
HBM (Human Body Model) ----------------------------------------------------------------------------------- 2kV
MM (Machine Model) ------------------------------------------------------------------------------------------ 200V
Recommended Operating Conditions (Note 4)
Supply Input Voltage, VIN ------------------------------------------------------------------------------------- 7V to 36V
Junction Temperature Range --------------------------------------------------------------------------------- 40°C to 125°C
Copyright ©2013 Richtek Technology Corporation. All rights reserved.
www.richtek.com
4
is a registered trademark of Richtek Technology Corporation.
DS8471-02 December 2013



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