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參數(shù)資料
| 型號(hào)： | RT9238CS |
| 廠商： | Electronic Theatre Controls, Inc. |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | VRM 8.5 PWM AND TRIPLE LINEAR POWER SYSTEM CONTROLLER |
| 中文描述： | VRM電源8.5脈寬調(diào)制和三線性電源系統(tǒng)控制器 |
| 文件頁數(shù)： | 9/24頁 |
| 文件大?。?/td> | 434K |
| 代理商： | RT9238CS |
Preliminary
RT9238
DS9238-01 July 2001
www.richtek-ic.com.tw
9
Functional Pin Description
DRIVE2 (Pin 1)
Connect this pin to the gate of an external MOSEFT.
This pin provides the drive for the VTT (V
OUT2
)
regulator’s pass transistor.
FIX (Pin 2)
Grounding this pin bypasses the internal resistor
dividers that set the voltage of the 1.5V and 1.8V
linear regulators. This way, the output voltage of the
two regulators can be adjusted from 1.26V up to the
input voltage (+3.3V or +5V) by way of an external
resistor divider corrected at the corresponding VSEN
pin. The new output voltage set by the external
resistor divider can be determined using the following
formula:
R
OUT
V
OUT
= 1.265V x (1+
R
GND
Where R
OUT
is the resistor connected from VSEN to
the output of the regulator, and R
GND
is the resistor
connected from VSEN to ground. Left open, this pin
is pulled high enabling fixed output voltage operation.
)
VID25, VID0, VID1, VID2, VID3 (Pin 7, 6, 5, 4, and 3)
VID3-25 are TTL-compatible the input pins to the 5-
bit DAC. The state logic of these five pins program
the internal voltage reference, DACOUT. The level of
DACOUT sets the microprocessor core converter
output voltage, as well as the corresponding PGOOD
and OVP thresholds. Table 1 specifies the DACOUT
voltage of 32 combinations of VID levels.
PGOOD (Pin 8)
PGOOD is an open collector output used to indicate
the status of the PWM converter output voltage. This
pin is pulled low when the synchronous regulator
output is not within
±
10% of the DACOUT reference
voltage, or when any of the other outputs are below
their under-voltage thresholds.
VTTPG (Pin 9)
VTTPG is an open collector output used to indicate
the status of the VTT (V
OUT2)
regulator output
voltage. This pin is pulled low when the output
voltage is below 1.08V under-voltage threshold or
when SS13 pin is below 1.25V.
FAULT/VID4 (Pin 10)
This pin provides two combined functions. One is
fault condition indicator, the other is VID4 for
VRM8.4 DAC (see the Table I). Pull up this pin up to
over 2V, it act like the VID4 of VRM8.4. When this
pin
is
pulled
high,
1.890V~2.090V output voltages.
Nominally, the voltage at this pin is pulled low by a
internal 47k
, in the event of an over-voltage or
over-current condition, this pin is internally pulled to
about 8V (VCC = 12V).
the
DACOUT
provide
VSEN2 (Pin 11)
Connect this pin to the output of the VTT (V
OUT2
)
linear regulator. This pin is also monitored for under-
voltage events.
SS24 (Pin 12)
Connect a capacitor from this pin to ground. This
capacitor, along with an internal 28
μ
A (V
SS24
>1V)
current source, sets the soft-start interval of the
V
OUT2
regulator. Pulling this pin below 0.8V induces
a chip reset and shutdown.
SS13 (Pin 13)
Connect a capacitor from this pin to ground. This
capacitor, along with an internal 28
μ
A (V
SS13
>1V)
current source, sets the soft-start interval of the
synchronous PWM converter (V
OUT1
) and the AGP
regulator (V
OUT3
). A VTTPG high signal is also
delayed by the time interval required by the charging
of this capacitor from 0V to 1.25V.
VSEN4 (Pin 14)
Connect this pin to the output of the 1.8V regulator.
This pin is monitored for under-voltage events.
DRIVE4 (Pin 15)
Connect this pin to the gate of an external MOSEFT.
This pin provides the drive for the 1.8V regulator’s
pass transistor.
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