rt9238 ETC-unknow, rt9238 Datasheet - Page 10
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rt9238
Manufacturer Part Number
rt9238
Description
Vrm 8.5 Pwm And Triple Linear Power System Controller
Manufacturer
ETC-unknow
Datasheet
1.RT9238.pdf
(24 pages)
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RT9238
VAUX (Pin 16)
This pin provides boost current for the three linear
regulator output drives in the event bipolar NPN
transistors (instead of N-channel MOSFETs) are
employed as pass elements. The voltage at this pin
is monitored for power-on reset (POR) purpose.
GND (Pin 17)
Signal ground for the IC. All voltage levels are
measured with respect to this pin.
DRIVE3 (Pin 18)
Connect this pin to the gate of an external MOSEFT.
This pin provides the drive for the 1.5V regulator’s
pass transistor.
VSEN3 (Pin 19)
Connect this pin to the output of the 1.5V linear
regulator. This pin is monitored for under-voltage
events.
ICOMP (Pin 20)
This pin is non-inverting input of the PWM error
amplifier. It determine the V
resistor (RF) to VDAC pin. A sense current of lower
MOSFET is fed to this pin to pull low the DACOUT
voltage. (see VDAC)
VDAC (Pin 21)
This pin is internal DAC buffer output. Connect a
resistor(RF) from this pin to ICOMP pin. The resistor
provide a voltage drop rated from lower MOSFET
turn on voltage drop. A sample hold circuit sense the
voltage drop of lower MOSFET(I
LGATE1 turn on. The ratio is :
FB1 (Pin 22)
This pin is connected to the PWM converter’s output
voltage. This pin also connects to internal PWM error
amplifier inverting input and power good monitor.
OCSET1 (Pin 23)
Connect a resistor from this pin to the drain of the
respective upper MOSFET. This resistor, an internal
200µA current source, and the upper MOSFET on-
resistance set the converter over-current trip point.
www.richtek-ic.com.tw
10
(I
L
x R
DSON )
x RF/3k
OUT1
voltage. Connect a
L
x R
DSON )
when
Preliminary
An over-current trip cycles the soft-start function. The
voltage at this pin is monitored for power-on reset
(POR) purpose and pulling this pin low with an open
drain device will shut down the IC.
PGND (Pin 24)
This is the power ground of UGATE1&LGATE1. Tie
the synchronous PWM converter’s lower MOSFET
source to this pin.
LGATE1 (Pin 25)
Connect LGATE1 to the PWM converter’s lower
MOSFET gate. This pin provides the gate drive for
the lower MOSFET.
PHASE1 (Pin 26)
This pin is used to monitor the voltage drop across
the upper MOSFET for over-current protection. This
pin is also used to sense lower MOSFET voltage
drop for V
UGATE1 (Pin 27)
Connect UGATE1 pin to the PWM converter’s upper
MOSFET gate. This pin provides the gate drive for
the upper MOSFET.
VCC (Pin 28)
Provide a 12V supply voltage for the IC to this pin.
This pin also provides the gate bias charge for all the
MOSFETs controlled by the IC. The voltage at this
pin monitored for power-on reset (POR) purpose.
OUT1
voltage droop tuning.
DS9238-01 July 2001