RT9644 Ver la hoja de datos (PDF) - Richtek Technology
Número de pieza
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RT9644 Datasheet PDF : 17 Pages
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RT9644/A
Preliminary
Absolute Maximum Ratings (Note 1)
l Supply Voltage, 5VSBY ------------------------------------------------------------------------------- 7V
l Supply Voltage, P12V --------------------------------------------------------------------------------- 16V
l BOOT, VBOOT − VPHASE -------------------------------------------------------------------------------- 7V
l UGATE Voltage ------------------------------------------------------------------------------------------ VPHASE − 0.3V to VBOOT + 0.3V
l LGATE Voltage ------------------------------------------------------------------------------------------ GND − 0.3V to 5VSBY + 0.3V
l Input, Output or I/O Voltage -------------------------------------------------------------------------- GND − 0.3V to 7V
l Power Dissipation, PD @ TA= 25°C
VQFN-28L 6x6 ------------------------------------------------------------------------------------------- 2.857W
l Package Thermal Resistance (Note 4)
VQFN-28L 6x6, θJA ------------------------------------------------------------------------------------- 35°C/W
l Junction Temperature ---------------------------------------------------------------------------------- 150°C
l Lead Temperature (Soldering, 10 sec.) ------------------------------------------------------------- 260°C
l Storage Temperature Range -------------------------------------------------------------------------- −40°C to 150°C
l ESD Susceptibility (Note 2)
HBM (Human Body Mode) ---------------------------------------------------------------------------- 2kV
MM (Machine Mode) ----------------------------------------------------------------------------------- 200V
Recommended Operating Conditions (Note 3)
l Supply Voltage, 5VSBY ------------------------------------------------------------------------------- 5V ± 5%
l Supply Voltage, P12V --------------------------------------------------------------------------------- 12V ± 10%
l Junction Temperature Range ------------------------------------------------------------------------- −40°C to 125°C
l Ambient Temperature Range ------------------------------------------------------------------------- −40°C to 85°C
Electrical Characteristics
(5VSBY = 5V, P12V = 12V, TA = 25°C, unless otherwise specification)
Parameter
5VSBY Supply Current
Nominal Supply Current
Symbol
Test Condition
ICC_S0
ICC_S5
S3# & S5# High,
UGATE/LGATE Open
S5# Low, S3# Don’t Care
UGATE/LGATE Open
Power-On Reset
Rising 5VSBY POR Threshold
Falling 5VSBY POR Threshold
Rising P12V POR Threshold
Falling P12V POR Threshold
Oscillator and Soft-Start
PWM Frequency
Ramp Amplitude
Soft-Start Interval
fOSC
△VOSC
tSS
Min Typ Max Units
5.5
7
8 mA
-- 700 850 µA
4
-- 4.35 V
3.6 -- 3.95 V
10
-- 10.5 V
8.8
-- 9.75 V
220 250 280 kHz
-- 1.5 --
V
6.5 8.2 9.5 ms
To be continued
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8
DS9644/A-01 August 2007
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