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| 型號(hào)： | MAX5963UTL+T |
| 廠商： | Maxim Integrated |
| 文件頁(yè)數(shù)： | 16/20頁(yè) |
| 文件大?。?/td> | 291K |
| 描述： | IC HOT SWAP DIO ORING CTL 40TQFN |
| 產(chǎn)品培訓(xùn)模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 類型： | 熱交換控制器 |
| 應(yīng)用： | FireWire? 應(yīng)用程序 |
| 內(nèi)部開(kāi)關(guān)： | 無(wú) |
| 電源電壓： | 7.5 V ~ 76 V |
| 工作溫度： | 0°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 40-WFQFN 裸露焊盤 |
| 供應(yīng)商設(shè)備封裝： | 40-TQFN-EP（6x6） |
| 包裝： | 帶卷 (TR) |
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Dual, 7.5V to 76V, Hot-Swap and
Diode ORing Controller
16 ______________________________________________________________________________________
Undervoltage Lockout
The MAX5963 dual-channel, independent current-limit
switches have independent ON/OFF control. Both
channels operate from 7.5V to 76V and have default
6.5V (typ) undervoltage lockout thresholds. The exter-
nal MOSFETs remain off as long as V
PS
< 6.5V or V
ON_
< V
ONTH
. The UVLO thresholds are programmable by
connecting a resistive voltage-divider between ON_
and GND. When V
PS
is greater than 7.5V and V
ON_
exceeds the 1.24V (typ) threshold, GATE1_ and
GATE2_ enhance to 5.5V, with respect to OUT_ and the
MAX5963 switch goes into normal operation.
Calculate the resistor values to program the switches
individual turn-on threshold voltages using the following
formula:
where V
TURN_ON
is the desired turn-on voltage of chan-
nel A and/or B. R
1
and R
2
create a resistive divider
from PS to ON_ (see the Typical Operating Circuit).
When operating the MAX5963, ON_ must remain above
its 1.24V (typ) threshold. If V
ON_
falls below the thresh-
old and hysteresis for more than 10祍 (typ), the power-
supply MOSFETs turn off. This allows the power supply
to disconnect from the load in the event of a fault condi-
tion such as shorting of the output to a different power-
supply voltage or to a FireWire signal pin. If possible
transient conditions exist that may exceed 10祍 (typ) at
the main power-supply line (PS), place an RC filter at
ON_ to reject transient voltage dips to prevent unnec-
essary power-supply interruptions.
Current-Fault Status Output (FAULT_)
FAULTA and FAULTB are high-voltage, open-drain out-
puts that pull low when a current-limit or circuit-breaker
fault shutdown has occurred. FAULTA and FAULTB
remain low until the next startup cycle. FAULTA and
FAULTB are capable of sinking up to 5mA when asserted.
Autoretry/Latchoff Fault Management
The MAX5963 autoretry feature attempts to restart after
an adjustable current-limit or circuit-breaker timeout, lim-
iting the duty cycle of the MOSFETs under continuous
fault conditions. Connect RETRY to BP or PS for
autorestart mode. Leave RETRY floating to select latchoff
mode after a current-limit/circuit-breaker timeout.
FAULT_ deasserts every time a restart attempt is made.
Logic Inputs
Power-Supply Enables (ENX, ENY, and ENZ)
Three enable inputs, ENX, ENY, and ENZ, can be used
to control power-on/power-off.
ENZ is a logic input that is ANDed with the OR combi-
nation of ENX and ENY. Apply a voltage greater than
1.8V (min) to ENZ to ensure that GATEPS is pulled high
when V
PWR
rises above the 6.5V (typ) PWR undervolt-
age lockout threshold.
Pull ENZ low to put the MAX5963 into PWR standby or
shutdown mode. The MAX5963 draws less than 10礎(chǔ)
from PWR in shutdown. See Table 2.
R
V
1.24V
1 x R
1
TURN_ON
2
=
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
Table 1. ORing Protection Truth Table
INPUT
OUTPUT
(V
SENSEA
+ V
SENSEB
)/2 > V
OR
GATEOR
DESCRIPTION
Yes
On
Normal operation. ORing MOSFET (QOR) is on to minimize power
dissipation.
No
Off
ORing protection. ORing MOSFET (QOR) is off, preventing current
flowing backward into the systems power supply, V
PWR
.
Table 2. Logic Input Truth Table
INPUT
OUTPUT
(ENX OR ENY) AND ENZ
GATEPS
DESCRIPTION
L
Off
System Power-Off Mode. The MAX5963 draws < 10礎(chǔ) from PWR after
[(ENX or ENY) and ENZ] goes low for more than t
SHDN
time.
H
On
Enable System Power. The system power supply, V
SUPPLY
, provides
power to the FireWire ports.
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