rt8470 Richtek Technology Corporation, rt8470 Datasheet - Page 3

• Manufacturer Part Number: rt8470
• Description: 1.2a/1a, Hysteretic, High Brightness Led Driver With Internal Switch
• Manufacturer: Richtek Technology Corporation

Absolute Maximum Ratings
Recommended Operating Conditions
DS8470-03 March 2011
Electrical Characteristics
(V
Mean Current Sense Threshold
Voltage
Sense Threshold Hysteresis
Low-Side Switch On-Resistance
Low-Side Switch Leakage Current
Under Voltage Lockout Threshold
Rising
Under Voltage Lockout Threshold
Hysteresis
Ramp Frequency
ADJ Input Threshold
Voltage
Analog Dimming Range
Analog Dimming
Threshold Voltage
TSOT-23-5, θ
TSOT-23-5, θ
TSOT-23-5, θ
Supply Input Voltage, V
Switch Voltage, LX --------------------------------------------------------------------------------------------- −0.3V to (V
Sense Voltage, SENSE -------------------------------------------------------------------------------------- (V
All Other Pins ----------------------------------------------------------------------------------------------------- −0.3V to 6V
Power Dissipation, P
SOP-8 (Exposed pad) ----------------------------------------------------------------------------------------- 1.333W
TSOT-23-5 (Single-layer PCB) ------------------------------------------------------------------------------- 0.400W
TSOT-23-5 (Four-layer PCB) --------------------------------------------------------------------------------- 0.625W
Package Thermal Resistance (Note 2)
SOP-8 (Exposed pad), θ
SOP-8 (Exposed pad), θ
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 Mode) ----------------------------------------------------------------------------------- 2kV
MM (Machine Mode) ------------------------------------------------------------------------------------------- 200V
Supply Input Voltage, V
Junction Temperature Range --------------------------------------------------------------------------------- −40°C to 125°C
IN
= 12V, T
A
Parameter
= 25°C, unless otherwise specified)
JA
JC
JA
(Four-layer PCB) --------------------------------------------------------------------------- 160°C/W
(Single-layer PCB) ------------------------------------------------------------------------- 250°C/W
(Single-layer PCB) ------------------------------------------------------------------------- 130°C/W
D
@ T
Logic-High
Logic-Low
Logic-High
Logic-Low
IN
IN
JA
JC
------------------------------------------------------------------------------------- −0.3V to 33V
------------------------------------------------------------------------------------- 7V to 30V
A
----------------------------------------------------------------------------------- 75°C/W
----------------------------------------------------------------------------------- 15°C/W
= 25°C
V
V
R
V
ΔV
f
V
V
RAMP
SENSE
SENSEHYS
UVLO
ADJ, H
ADJ, L
DS(ON)
Symbol
UVLO
(Note 1)
Measure on SENSE Pin with
Respect to V
V
LX
= 5V
Test Conditions
(Note 4)
IN
. V
ADJ
is Floating.
Min
1.4
0.3
0.3
95
--
--
--
--
--
--
--
--
IN
0.01
Typ
100
±15
350
400
300
5.2
1.2
0.4
--
--
--
− 5V) to (V
RT8470
To be continued
www.richtek.com
Max
105
0.2
1.3
1.3
10
IN
--
--
--
--
--
--
--
+ 0.7V)
IN
+ 0.3V)
Unit
mΩ
mV
mV
μA
Hz
%
V
V
V
V
V
3