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參數(shù)資料
| 型號(hào)： | MAX5923EUP+T |
| 廠商： | Maxim Integrated |
| 文件頁(yè)數(shù)： | 8/12頁(yè) |
| 文件大?。?/td> | 444K |
| 描述： | IC HOT-SWAP SWITCH +60V 20-TSSOP |
| 產(chǎn)品培訓(xùn)模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 系列： | Simple Swapper™ |
| 類型： | 熱交換開關(guān) |
| 應(yīng)用： | 通用 |
| 內(nèi)部開關(guān)： | 是 |
| 電流限制： | 800mA |
| 電源電壓： | 16 V ~ 60 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 20-TSSOP（0.173"，4.40mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 20-TSSOP |
| 包裝： | 帶卷 (TR) |
Detailed Description
The MAX5923 is a fully integrated hot-swap switch that
contains a 0.45& integrated power MOSFET and oper-
ates from a +16V to +60V supply rail. The device allows
the safe insertion and removal of circuit cards into live
backplanes without causing problematic glitches on the
supply rail. The device also monitors various circuit para-
meters and disconnects the load if a fault condition
occurs, alerting the host with a logic-level FAULT output.
The MAX5923 provides an Enable input to enable/disable
the device with a logic signal and logic output POK that
indicates when the output voltage has reached within
750mV of the input voltage. Three fault conditions are
monitored: a zero-current condition, an overcurrent con-
dition, and a thermal overload condition. A FAULT output
indicates to the host if an overcurrent or thermal fault
occurs and a ZC output indicates if the output has a zero-
current condition. An undervoltage lockout circuitry shuts
down the device if the input voltage falls below the UVLO
threshold.
Power-Up Mode
During power-up, the MAX5923 gradually turns on the
integrated N-channel MOSFET. To minimize EMI, the
MAX5923 limits the output voltage slew rate at the OUT
pin to dV
OUT
/dt = 100V/ms (max) and the output current
slew rate out of the OUT pin to dI
OUT
/dt = 35A/ms (max).
The MAX5923 has an integrated 0.45& N-channel power
MOSFET. The MOSFETs drain is connected to the
DRAIN pin and its source is connected to the OUT pin.
The MAX5923 monitors and provides current-limit protec-
tion to the load at all times. The current limit is program-
mable using an external current-sensing resistor
connected from IN to DRAIN. The MAX5923 features cur-
rent-limit foldback and duty-cycle limit to ensure robust
operation during load-fault and short-circuit conditions
(see the Overcurrent Protection section).
When V
OUT
is within 750mV of V
IN
for more than
t
POK_HIGH
, POK goes open-drain. After POK is assert-
ed, the MAX5923 activates the zero-current detection
function. This function monitors the output for an under-
current condition and eventually turns off the power to
the output if the load is disconnected (see the Zero-
Current Detection section).
Undervoltage Lockout (UVLO)
The MAX5923 operates from a +16V to +60V supply
voltage range and has a default UVLO set at +28V. The
UVLO threshold is adjustable using a resistive divider
connected to the UVLO pin (see Figure 1). When the
input voltage is below the UVLO threshold, all operation
stops and the MOSFET is held off. When the input volt-
age is above the UVLO threshold and EN is high, the
MAX5923 goes into operation.
To adjust the UVLO threshold, connect an external
resistive divider from IN to UVLO and then from UVLO
to AGND. Use the following equation to calculate the
new UVLO threshold:
V
REF
is typically 1.33V. The UVLO pin input resistance is
50k& (min), so keep the R1 and R2 parallel combination
value at least 20 times smaller than 50k& to minimize
the new UVLO threshold error.
V
V
R
R
UVLO TH
REF
_
=
+
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
1
1
2
+60V Simple Swapper Hot-Swap Switch
8 _______________________________________________________________________________________
PIN
NAME
FUNCTION
13
DGND
Digital Ground. DGND can vary ?V from AGND. DGND and AGND must be connected together at a
single point in the system.
14
LATCH
Fault Management Selection Digital Input. Referenced to DGND. Connect to logic high to latch off
after a fault condition. Connect to logic low for automatic restart after a fault condition (see the Fault
Management section).
15
ZC_EN
Zero-Current Detection Enable Logic Input. Referenced to DGND. Connect ZC_EN to a logic high to
enable the zero-current detection circuitry. Connect ZC_EN to a logic low to disable this function.
16
EN
ON/OFF Control-Logic Input. Referenced to DGND. Connect to logic high to enable the device.
Connect to logic low to disable the device and reset a latched-off condition.
17
VDIG
Digital Supply Voltage. VDIG is the supply voltage for the internal digital logic circuity. EN, LATCH,
and ZC_EN input logic thresholds are automatically scaled to the voltage on VDIG. See the Typical
Application Circuit for proper filtering.
20
OUT
Output Voltage
Pin Description (continued)
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|---|---|
| MAX5924AEUB | 功能描述:熱插拔功率分布 RoHS:否 制造商:Texas Instruments 產(chǎn)品:Controllers & Switches 電流限制: 電源電壓-最大:7 V 電源電壓-最小:- 0.3 V 工作溫度范圍: 功率耗散: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
| MAX5924AEUB+ | 功能描述:熱插拔功率分布 1-13.2V Hot-Swap Controller RoHS:否 制造商:Texas Instruments 產(chǎn)品:Controllers & Switches 電流限制: 電源電壓-最大:7 V 電源電壓-最小:- 0.3 V 工作溫度范圍: 功率耗散: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
| MAX5924AEUB+T | 功能描述:熱插拔功率分布 1-13.2V Hot-Swap Controller RoHS:否 制造商:Texas Instruments 產(chǎn)品:Controllers & Switches 電流限制: 電源電壓-最大:7 V 電源電壓-最小:- 0.3 V 工作溫度范圍: 功率耗散: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
| MAX5924AEUB-T | 功能描述:熱插拔功率分布 RoHS:否 制造商:Texas Instruments 產(chǎn)品:Controllers & Switches 電流限制: 電源電壓-最大:7 V 電源電壓-最小:- 0.3 V 工作溫度范圍: 功率耗散: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
| MAX5924BEUB | 功能描述:熱插拔功率分布 RoHS:否 制造商:Texas Instruments 產(chǎn)品:Controllers & Switches 電流限制: 電源電壓-最大:7 V 電源電壓-最小:- 0.3 V 工作溫度范圍: 功率耗散: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
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