參數(shù)資料
型號(hào)： LTC2924CGN
廠商： LINEAR TECHNOLOGY CORP
元件分類(lèi)： 電源管理
英文描述： Quad Power Supply Sequencer
中文描述： 4-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO16
封裝： 0.150 INCH, PLASTIC, SSOP-16
文件頁(yè)數(shù)： 5/16頁(yè)
文件大?。?/td> 190K
代理商： LTC2924CGN
LTC2924
5
2924f
IN1-IN4 (Pins 1, 2, 3, 4):
Sequenced Power Supply
Monitor. Connect this pin to an external resistive divider
between each sequenced power supply and GND. During
Power On sequencing, 0.61V (typ) at this pin indicates that
the sequenced power supply (enabled with each of the
OUT1-OUT4 pins) has reached the desired Power On
sequence voltage. A hysteresis current (programmed by
the HYS pin) is sourced out of each of the IN1-IN4 pins
after the 0.61V threshold is detected. During the Power Off
sequence, 0.61V at this pin indicates that the sequenced
power supply has reached the desired Power Off voltage.
The hysteresis current is removed after the 0.61V thresh-
old is detected.
OUT1-OUT4 (Pins 5, 6, 7, 8):
Sequenced Power Supply
Enable. Connect this pin to the shutdown pin or an external
series N-channel MOSFET for each power supply being
sequenced. (A low at this pin means the sequenced power
supply is commanded to turn off.) When disabled, each
output is connected to GND with a resistance of <240
.
When enabled, each output is connected to an internally
generated charge pump supply (nominally V
CC
+ 5V) via
an internal 10
μ
A (typ) current source.
FAULT (Pin 9):
Fault Pin. Pull this pin high with an external
10k resistor. The LTC2924 will pull this pin low if a fault
condition is detected (see Applications Information for
details). Pulling this pin low externally causes a simulta-
neous unsequenced Power Off.
DONE (Pin 10):
Done Pin. Pull this pin high with an
external 10k resistor. This open-drain output pulls low at
the completion of the Power-On sequence. At the end of
the Power Off sequence, the LTC2924 floats this pin.
V
CC
(Pin 11):
Power Supply Input. All internal circuits are
powered from this pin. V
CC
should be connected to a low
noise power supply voltage and should be bypassed with
at least a 0.1
μ
F capacitor to the GND pin in close proximity
to the LTC2924.
PGT (Pin 12):
Power Good Timer. The PGT pin sets the
time allowed for a power supply to turn on after being
enabled with the OUT1-OUT4 pins. Connecting a capacitor
between this pin and ground programs a 0.2
μ
s/
μ
F dura-
tion. The PGT pin is reset before each of the OUT1-OUT4
pins are asserted. If the voltage at the PGT pin reaches 1V,
a fault condition is asserted. The PGT pin must be con-
nected directly to ground to disable the power good timer
function.
GND (Pin 13):
Ground. All internal circuits are returned to
the GND pin. Connect this pin to the ground of the power
supplies that are being sequenced.
TMR (Pin 14):
Timer. This pin sets the time delay between
a supply ready (IN1-IN4) signal and the enabling of the
next power supply in the sequence (OUT1-OUT4). Con-
necting a capacitor between this pin and ground programs
a 0.2
μ
s/
μ
F duration. The TMR pin may be left floating if no
delay is required between supplies being sequenced on or
off. If an internal fault condition occurs, TMR will indicate
so by going to V
CC
until the fault condition is cleared. Do
not connect any other circuits to the TMR pin.
HYS/CFG (Pin 15):
Hysteresis Current Setting and Cas-
cade Configuration. Connecting a resistor between this
pin and GND programs a 0.5/R
EXT
(typ) hysteresis current
which is sourced out of each IN and ON pin. When multiple
LTC2924s are cascaded, the HYS/CFG pin is also used to
configure the position of the firstLTC2924. See Applica-
tions Information for details.
ON (Pin 16):
On Pin. Commands the LTC2924 to sequence
the power supplies up (Power On sequence) or down
(Power Off sequence). Typically connected to a system
controller. Hysteresis current is applied to this pin when
above 0.61V (typ). This pin has a precision 0.61V thresh-
old and can be used to sense a nonsequenced power
supply’s voltage to start the Power On sequence. See
Applications Information for details. For cascading mul-
tiple LTC2924s, see Applications Information for connect-
ing the ON pin.
PIU
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