RT9248 查看數據表（PDF） - Richtek Technology
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RT9248 Datasheet PDF : 14 Pages
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RT9248
Preliminary
Absolute Maximum Ratings (Note 1)
z Supply Voltage, VCC ------------------------------------------------------------------------------------------- 7V
z Input, Output or I/O Voltage ---------------------------------------------------------------------------------- GND-0.3V to VCC+0.3V
z Package Thermal Resistance
TSSOP-28, θJA -------------------------------------------------------------------------------------------------- 45°C/W
z Junction Temperature ------------------------------------------------------------------------------------------ 150°C
z Lead Temperature (Soldering, 10 sec.) -------------------------------------------------------------------- 260°C
z Storage Temperature Range --------------------------------------------------------------------------------- −65°C to 150°C
z ESD Susceptibility (Note 2)
HBM (Human Body Mode) ----------------------------------------------------------------------------------- 2kV
MM (Machine Mode) ------------------------------------------------------------------------------------------- 200V
Recommended Operating Conditions (Note 3)
z Supply Voltage, VCC ------------------------------------------------------------------------------------------- 5V ± 10%
z Ambient Temperature Range --------------------------------------------------------------------------------- 0°C to 70°C
z Junction Temperature Range --------------------------------------------------------------------------------- 0°C to 125°C
Electrical Characteristics
(VCC = 5V, TA = 25°C, unless otherwise specified)
Parameter
Symbol
VCC Supply Current
Nominal Supply Current
ICC
Power-On Reset
POR Threshold
Hysteresis
VCCRTH
VCCHYS
VDVD Threshold
Trip (Low to High)
Hysteresis
VDVDTP
VDVDHYS
Oscillator
Free Running Frequency
fOSC
Frequency Adjustable Range
fOSC_ADJ
Ramp Amplitude
Ramp Valley
ΔVOSC
VRV
Maximum On-Time of Each Channel
RT Pin Voltage
VRT
Reference and DAC
DACOUT Voltage Accuracy
ΔVDAC_10
DACOUT Voltage Accuracy
ΔVDAC_9
Test Conditions
PWM 1,2,3 Open
VCC Rising
Enable
RRT = 12kΩ
RRT = 12kΩ
RRT = 12kΩ
VRD10, VDAC ≥ 1V
VRD10, VDAC < 1V
VRM9
Min Typ Max Units
--
12
--
mA
4.0 4.2 4.5
V
0.2 0.5 --
V
0.95 1.0 1.05 V
--
70
--
mV
170 200 230 kHz
50
-- 400 kHz
-- 1.9 --
V
-- 1.0 --
V
62 66 75
%
0.55 0.60 0.65 V
−1
--
+1
%
−10 -- +10 mV
−1
--
+1
%
To be continued
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6
DS9248-05 March 2007
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