RT9214 Datasheet, PDF (5/17 Pages) Richtek Technology Corporation – 5V/12V Synchronous Buck PWM DC-DC Controller

RT9214
Parameter
Symbol
Test Conditions
Oscillator
Free Running Frequency
Ramp Amplitude
Error Amplifier (GM)
f_OSC
ΔV_OSC
V_CC = 12V
V_CC = 12V
E/A Transconductance
g_m
Open Loop DC Gain
A_O
PWM Controller Gate Drivers (V_CC = 12V)
Upper Gate Source
I_UGATE
Upper Gate Sink
Lower Gate Source
Lower Gate Sink
Dead Time
Protection
R_UGATE
I_LGATE
R_LGATE
T_DT
V_BOOT − V_PHASE = 12V,
V_UGATE − V_PHASE = 6V
V_BOOT − V_PHASE = 12V,
V_UGATE − V_PHASE = 1V
V_CC = 12V, V_LGATE = 6V
V_CC = 12V, V_LGATE = 1V
FB Under-Voltage Trip
OC Current Source
Soft-Start Interval
Δ _FBUVT
I_OC
T_SS
FB Falling
V_PHASE = 0V
Min Typ Max Units
250 300 350 kHz
-- 1.5 -- V_P-P
-- 0.2 -- ms
-- 90 -- dB
0.6 1
--
A
--
4
8
Ω
0.6 1
--
A
--
3
5
Ω
-- -- 100 ns
70 75 80 %
35 40 45 μA
-- 3.5 -- ms
Note 1. Stresses listed as the above "Absolute Maximum Ratings" may cause permanent damage to the device. These are for
stress ratings. Functional operation of the device at these or any other conditions beyond those indicated in the
operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended
periods may remain possibility to affect device reliability.
Note 2. Devices are ESD sensitive. Handling precaution recommended.
Note 3. The device is not guaranteed to function outside its operating conditions.
Note 4. θJA is measured in the natural convection at TA = 25°C on a low effective thermal conductivity test board of
JEDEC 51-3 thermal measurement standard.
DS9214-13 September 2007
www.richtek.com
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