Preliminary
Absolute Maximum Ratings
(Note 1)
RT9247
Supply Voltage, V
CC -----------------------------------------------------------------------------------------------------------------------------------
7V
Input, Output or I/O Voltage ---------------------------------------------------------------------------------- GND-0.3V to V
CC
+0.3V
Package Thermal Resistance
TSSOP-28,
θ
JA
--------------------------------------------------------------------------------------------------
45°C/W
Junction Temperature ------------------------------------------------------------------------------------------ 150°C
Lead Temperature (Soldering, 10 sec.) -------------------------------------------------------------------- 260°C
Storage Temperature Range ---------------------------------------------------------------------------------
−65°C
to 150°C
ESD Susceptibility (Note 2)
HBM (Human Body Mode) ----------------------------------------------------------------------------------- 2kV
MM (Machine Mode) ------------------------------------------------------------------------------------------- 200V
Recommended Operating Conditions
(Note 3)
Supply Voltage, V
CC
------------------------------------------------------------------------------------------- 5V
±
10%
Ambient Temperature Range --------------------------------------------------------------------------------- 0°C to 70°C
Junction Temperature Range --------------------------------------------------------------------------------- 0°C to 125°C
Electrical Characteristics
(V
CC
= 5V, T
A
= 25°C, unless otherwise specified)
Parameter
V
CC
Supply Current
Nominal Supply Current
Power-On Reset
POR Threshold
Hysteresis
V
DVD
Threshold
Oscillator
Free Running Frequency
Frequency Adjustable Range
Ramp Amplitude
Ramp Valley
Maximum On-Time of Each Channel
RT Pin Voltage
Reference and DAC
DACOUT Voltage Accuracy
DAC (VID0-VID125) Input Low
DAC (VID0-VID125) Input High
ΔV
DAC
V
ILDAC
V
IHDAC
V
DAC
≥
1V
V
DAC
< 1V
−1
−10
--
0.8
--
--
--
--
+1
+10
0.4
--
%
mV
V
V
V
RT
R
RT
= 12kΩ
f
OSC
f
OSC_ADJ
ΔV
OSC
V
RV
R
RT
= 12kΩ
R
RT
= 12kΩ
170
50
--
--
62
0.55
200
--
1.9
1.0
66
0.60
230
400
--
--
75
0.65
kHz
kHz
V
V
%
V
Trip (Low to High)
Hysteresis
V
CCRTH
V
CCHYS
V
DVDTP
V
DVDHYS
Enable
V
CC
Rising
4.0
0.2
0.95
--
4.2
0.5
1.0
70
4.5
--
1.05
--
V
V
V
mV
I
CC
PWM 1,2,3 Open
--
12
--
mA
Symbol
Test Conditions
Min
Typ
Max
Units
To be continued
DS9247-05 March 2007
www.richtek.com
7
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
