SI9140DQ VISHAY [Vishay Siliconix], SI9140DQ Datasheet - Page 7

• Manufacturer Part Number: SI9140DQ
• Description: MP Controller For High Performance Process Power Supplies
• Manufacturer: VISHAY [Vishay Siliconix]

Pin 1: V
The positive power supply for all functional blocks except
output driver. A bypass capacitor of 0.1 mF (minimum) is
recommended.
Pin 2: MON
Non-inverting input of a comparator. Inverting input is tied
internally to reference voltage. This comparator is typically
used to monitor the output voltage and to flag the processor
when the output voltage falls out of regulation.
Pin 3: V
This is an open drain output. It will be held at ground when the
voltage at MON (Pin 2) is less than the internal reference. An
external pull-up resistor will pull this pin high if the MON pin (Pin
2) is higher than the V
Pin 4: COMP
This pin is the output of the error amplifier. A compensation
network is connected from this pin to the FB pin to stabilize the
system. This pin drives one input of the internal pulse width
modulation comparator.
Pin 5: FB
The inverting input of the error amplifier. An external resistor
divider is connected to this pin to set the regulated output
voltage. The compensation network is also connected to this
pin.
Pin 6: NI
The non-inverting input of the error amplifier.
operation it is externally connected to V
reference.
Pin 7: V
This pin supplies a 1.5-V reference.
Pin 8: GND (Ground)
Pin 9: ENABLE
A logic high on this pin allows normal operation. A logic low
places the chip in the standby mode. In standby mode normal
Document Number: 70026
S-40699—Rev. H, 19-Apr-04
PIN DESCRIPTION
DD
GOOD
REF
REF
. (Refer to Pin 2 description.)
REF
or an external
In normal
operation is disabled, supply current is reduced, the oscillator
stops and D
Pin 10: R
A resistor connected from this pin to ground sets the
oscillator’s capacitor C
See the oscillator section of the description of operation.
Pin 11: C
An external capacitor is connected to this pin to set the
oscillator frequency.
Pin 12: UVLO
This pin will place the chip in the standby mode if the UVLO
voltage drops below 1.2 V.
exceeds 1.2 V, the chip operates normally. There is a built-in
hysteresis of 165 mV.
Pin 13: P
The negative return for the V
Pin 14: D
This CMOS push-pull output pin drives the external p-channel
MOSFET. This pin will be high in the standby mode. A
break-before-make function between D
Pin 15: D
This CMOS push-pull output pin drives the external n-channel
MOSFET. This pin will be low in the standby mode. A
break-before-make function between the D
Pin 16: V
The positive terminal of the power supply which powers the
CMOS output drivers. A bypass capacitor is required.
f
OSC
OSC
GND
S
OSC
S
R
]
S
R
goes high while D
OSC
SET
0.75
C
OSC
OSC
, charge and discharge current.
S
supply.
Once the UVLO
R
(at V
goes low.
Vishay Siliconix
DD
S
= 5.0 V)
and D
S
and D
R
www.vishay.com
Si9140
SET
is built-in.
R
is built-in.
voltage
SET
7